Consulta: subjectFacets:"Freshwater"
Registros recuperados: 71
Data/hora: 01/06/2024 05:55:44

Assessing Future Ecosystem Services: a Case Study of the Northern Highlands Lake District, Wisconsin
Provedor de dados: Ecology and Society
Autores: Peterson, Garry D; McGill University; garry.peterson@mcgill.ca; Beard Jr., T. Douglas; Wisconsin Department of Natural Resources; BEARDT@dnr.state.wi.us; Beisner, Beatrix E; University of Wisconsin-Madison; bebeisner@facstaff.wisc.edu; Bennett, Elena M; University of Wisconsin-Madison; embennett@wisc.edu; Carpenter, Stephen R; University of Wisconsin-Madison; srcarpen@wisc.edu; Cumming, Graeme; University of Florida; cummingg@wec.ufl.edu; Dent, C. Lisa; University of Wisconsin-Madison; ldent@facstaff.wisc.edu,; Havlicek, Tanya D; University of Wisconsin-Madison; TDHAVLIC@students.wisc.edu.
The Northern Highlands Lake District of Wisconsin is in transition from a sparsely settled region to a more densely populated one. Expected changes offer benefits to northern Wisconsin residents but also threaten to degrade the ecological services they rely on. Because the future of this region is uncertain, it is difficult to make decisions that will avoid potential risks and take advantage of potential opportunities. We adopt a scenario planning approach to cope with this problem of prediction. We use an ecological assessment framework developed by the Millennium Ecosystem Assessment to determine key social and ecological driving forces in the Northern Highlands Lake District. From these, we describe three alternative scenarios to the year 2025 in which...
Tipo: Peer-Reviewed Reports
Palavras-chave: Northern Highlands Lake District; Wisconsin; Assessment; Ecosystem services; Freshwater; Futures; Prediction; Scenario planning.
Ano: 2003

QUANTITATIVE KARYOTYPE OF DIPLODON CHILENSIS (GRAY 1828) (BIVALVIA:HYRIIDAE)
Provedor de dados: Gayana
Autores: Jara-Seguel,Pedro; Peredo,Santiago; Palma-Rojas,Claudio; Parada,Esperanza; Lara,Gladys.
The karyotype of a freshwater population of Diplodon chilensis located in La Poza area of the Villarrica Lake (39º18'S; 72º05'W), Southern Chile, was studied. The chromosomes were obtained by squash of cleaving embryos, previously treated with colchicine and fixed in ethanol-acetic acid 3:1 at 4ºC and stained using the Feulgen reaction. Diplodon chilensis showed a diploid karyotype of 2n = 34, with metacentric and submetacentric chromosomes. This work is the first approach to cytogenetic characterization of Chilean populations of this species.
Tipo: Journal article
Palavras-chave: Hyriidae; Diplodon chilensis; Karyotype; Freshwater; Bivalves; Southern Chile; Hyriidae; Diplodon chilensis; Cariotipo; Bivalvos dulceacuícolas; Sur de Chile.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382000000200008

ALGAL STUDIES IN BOLIVIA: A COMPILATION AND PRELIMINARY ANALYSIS OF EXISTING PHYCOLOGICAL LITERATURE
Provedor de dados: Gayana Botánica
Autores: Morales,Eduardo A; Fernández,Erika; Fernandez,Carla E; Lizarro,Dennis; Alcoreza,Pamela.
A compilation of phycological literature published on Bolivian algae is presented together with an analysis of strengths, weaknesses, and needs in this field of investigation. An analysis of the nationality of authors, type, content, and geographic focus of the references shows that literature is largely produced by foreign scientist, concentrated on just a few areas of the country, or are biased toward particular algal groups, leaving ample room for more exploration. The Altiplano (high mountain plateau) and Amazon concentrate most of the publications, the phytoplankton and algae found in sediment cores, being the communities that have received more attention from scientists. Taxonomic references focus more on phytoplankton and tychoplankton communities...
Tipo: Journal article
Palavras-chave: Bolivia; Phycology; Algae; Freshwater.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432008000100009

Establishment of a new genus for Parastenocaris itica (Copepoda, Harpacticoida) from El Salvador, Central America, with discussion of the Parastenocaris fontinalis and P. proserpina groups
Provedor de dados: Iheringia Série Zoologia
Autores: Corgosinho,Paulo Henrique C.; Arbizu,Pedro Martínez; Previattelli,Daniel.
A new genus of Parastenocarididae is described from the Neotropical region. Iticocaris gen. nov. is established to include Parastenocaris itica Noodt, 1962. Iticocaris gen. nov. is defined by the following characters: 1) male leg 3 with 2-segmented exopod; 2) first exopodal segment short and rectangular; 3) thumb hypertrophic, longer than the second exopodal segment and inserted on the distal edge of exopod segment 1, occupying the whole distal margin; 4) exopod 2 or apophysis strongly sclerotized, articulated with the exopod segment 1 on its inner margin and curved against the thumb, forming a strong forceps; 5) leg 4 endopod without dimorphism in shape and size vs. minor dimorphism in ornamentation; 6) leg 5 with three setae and 7) lack of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Freshwater; Neotropics; Parastenocarididae; Taxonomy.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212012000400006

Effect of temperature changes on the cercarial-shedding rate of two trematodes
Provedor de dados: Iheringia Série Zoologia
Autores: Achiorno,Cecilia L.; Martorelli,Sergio R.
ABSTRACT Since temperature is a key condition in the initiation of cercarial emergence, the objective of the work reported here was to evaluate the effect of that variable on the shedding of two morphologic and taxonomic types of cercariae. Bioassays were accordingly performed with snails naturally infected with either monostome or pleurolophocercous cercariae because those two cercarial types were found to be the most prevalent in the environment under study. The snails were placed in 6-ml circular plastic dishes with soft plastic stoppers containing 3 ml of reconstituted water and then sequentially exposed for 24 h to a 14:10-h light:dark cycle at 20, 25, or 30 °C. The data were analyzed at a significance level of p &lt;0.05 by means of the InfoStat...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Parasites; Cercarial emergence; Freshwater; Temperature; Bioassay.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212016000100220

Abundancia y distribución de las especies ícticas (Osteichthyes) del río San Francisco-Cosquín, Córdoba, Argentina
Provedor de dados: Iheringia Série Zoologia
Autores: Hued,Andrea Cecilia; Bistoni,María de los Ángeles.
It was made the characterization of the San Francisco-Cosquín Mountain River fish community, Córdoba, Argentina. Samples of fish were taken from selected sites from November 1998 to November 1999. Eleven species were recorded, eight of which are first reports for this river. Relative abundance for each species, species richness, diversity and dominance were estimated. Bryconamericus iheringi (Boulenger, 1887) y Jenynsia multidentata (Jenyns, 1842) were the most abundant.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish; Freshwater; Community attributes.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212001000200010

Elaboração de silagem ácida de vísceras de surubin (Pseudoplatystoma sp.).
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: HISANO, H.; BORGHESI, R.
bitstream/item/62557/1/CT201118-1.pdf
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Production.; Água Doce; Nutrição; Peixe; Produção.; Fish; Freshwater; Nutrition.
Ano: 2011
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/929778

Including 38 kHz in the standardization protocol for hydroacoustic fish surveys in temperate lakes
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Mouget, Anne; Goulon, Chloé; Axenrot, Thomas; Balk, Helge; Lebourges-dhaussy, Anne; Godlewska, Malgorzata; Guillard, Jean.
Hydroacoustics has become a requisite method to assess fish populations and allows to describe the relationships of fish with other elements of the aquatic ecosystem. This nonintrusive method is currently an integral part of the sampling procedures recommended for fish stock assessment by the Water Framework Directive and has been standardized by the European Committee for Standardization [CEN (2014) CSN EN 15910 ‐ Water quality ‐ Guidance on the estimation of fish abundance with mobile hydroacoustic methods, Category: 7577 Water quality. Biological.]. In Europe, hydroacoustic surveys are performed in freshwater using different frequencies. Consequently, there is a need to evaluate if survey results can be compared. This study aimed to carry out in situ...
Tipo: Text
Palavras-chave: Fisheries acoustics; Frequencies comparison; Freshwater; Hydroacoustics; Lake; Standardization.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00484/59605/62619.pdf

Response of Arctic Freshwater to the Arctic Oscillation in Coupled Climate Models
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Cornish, Sam B.; Kostov, Yavor; Johnson, Helen L.; Lique, Camille.
The freshwater content (FWC) of the Arctic Ocean is intimately linked to the stratification—a physical characteristic of the Arctic Ocean with wide relevance for climate and biology. Here, we explore the relationship between atmospheric circulation and Arctic FWC across 12 different Coupled Model Intercomparison Project Phase 5 control run simulations. Using multiple lagged regression, we seek to isolate the linear response of Arctic FWC to a step change in the strength of the Arctic Oscillation (AO), as well as the second and third orthogonal modes of SLP variability over the Arctic domain. There is broad agreement amongst models that a step change to a more anticyclonic AO leads to an increase in Arctic FWC, with an e-folding timescale of five to ten...
Tipo: Text
Palavras-chave: Arctic; Arctic Oscillation; Freshwater; Statistical techniques; Regression.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00601/71270/69668.pdf

Heavy metal contamination and hepatic toxicological responses in brown trout (Salmo trutta) from the Kerguelen Islands
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Jaffal, Ali; Betoulle, Stephane; Biagianti-risbourg, Sylvie; Terreau, Alexandre; Sanchez, Wilfried; Paris-palacios, Severine.
The Kerguelen Islands include various species of freshwater fish such as brown trout (Salmo trutta). These trout are among the most isolated from direct anthropogenic impact worldwide. This study was designed to analyse cadmium (Cd) and copper (Cu) concentrations in the liver of Kerguelen brown trout, and to assess the possible impacts of these metals on hepatic histopathology and oxidative stress parameters (superoxide dismutase and catalase activity and glutathione levels). Trout were caught in the Chateau River, the Studer Lakes and the Ferme Pond, close to the scientific station of the Kerguelen Islands, corresponding to three morphotypes (river, lake and station). Kerguelen trouts' hepatic concentrations of Cd and Cur were similar to those reported in...
Tipo: Text
Palavras-chave: Brown trout; Freshwater; Fish; Sub-Antarctic; Liver; Biomarkers.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00499/61109/64571.pdf

CMIP5 Model Intercomparison of Freshwater Budget and Circulation in the North Atlantic
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Deshayes, Julie; Curry, Ruth; Msadek, Rym.
The subpolar North Atlantic is a center of variability of ocean properties, wind stress curl, and air-sea exchanges. Observations and hindcast simulations suggest that from the early 1970s to the mid-1990s the subpolar gyre became fresher while the gyre and meridional circulations intensified. This is opposite to the relationship of freshening causing a weakened circulation, most often reproduced by climate models. The authors hypothesize that both these configurations exist but dominate on different time scales: a fresher subpolar gyre when the circulation is more intense, at interannual frequencies (configuration A), and a saltier subpolar gyre when the circulation is more intense, at longer periods (configuration B). Rather than going into the detail of...
Tipo: Text
Palavras-chave: Atmosphere-ocean interaction; Freshwater; Climate models; Model comparison; Climate variability; North Atlantic Oscillation.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00199/31024/29429.pdf

Sea surface salinity as a proxy for Arctic Ocean freshwater changes
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Fournier, Severine; Lee, Tong; Wang, Xiaochun; Armitage, Thomas W. K.; Wang, Ou; Fukumori, Ichiro; Kwok, Ron.
The changing Arctic freshwater content and distribution have significant implications for ocean circulation, climate, and water and biogeochemical cycles. The paucity of in‐situ salinity measurements in the Arctic Ocean has limited our ability to study Arctic‐Ocean freshwater variability. Although satellite‐derived sea surface height (SSH) and ocean bottom pressure (OBP) have been used together to infer depth‐integrated freshwater content changes, these measurements are limited in sampling and resolution. Motivated by the recent development of sea surface salinity (SSS) remote sensing, we explore the use of SSS as a proxy for Arctic freshwater changes. As a first step, here we conduct a proof‐of‐concept study by analyzing the output of an ocean‐ice state...
Tipo: Text
Palavras-chave: Arctic; Sea surface height; Gravimetry; Sea surface salinity; Freshwater.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00630/74164/73778.pdf

Global Patterns of Submesoscale Surface Salinity Variability
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Drushka, Kyla; Asher, William E.; Sprintall, Janet; Gille, Sarah T.; Hoang, Clifford.
Surface salinity variability on O(1-10) km lateral scales (the submesoscale) generates density variability and thus has implications for submesoscale dynamics. Satellite salinity measurements represent a spatial average over horizontal scales of approximately 40-100 km but are compared to point measurements for validation, so submesoscale salinity variability also complicates validation of satellite salinities. Here, we combine several databases of historical thermosalinograph (TSG) measurements made from ships to globally characterize surface submesoscale salinity, temperature, and density variability. In river plumes; regions affected by ice melt or upwelling; and the Gulf Stream, South Atlantic, and Agulhas Currents, submesoscale surface salinity...
Tipo: Text
Palavras-chave: Small scale processes; Freshwater; Fronts; Sea surface temperature; Oceanic variability.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00676/78805/81042.pdf

An assessment of the Arctic Ocean in a suite of interannual CORE-II simulations. Part II: Liquid freshwater
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Wang, Qiang; Ilicak, Mehmet; Gerdes, Ruediger; Drange, Helge; Aksenov, Yevgeny; Bailey, David A.; Bentsen, Mats; Biastoch, Arne; Bozec, Alexandra; Boening, Claus; Cassou, Christophe; Chassignet, Eric; Coward, Andrew C.; Curry, Beth; Danabasoglu, Gokhan; Danilov, Sergey; Fernandez, Elodie; Fogli, Pier Giuseppe; Fujii, Yosuke; Griffies, Stephen M.; Iovino, Doroteaciro; Jahn, Alexandra; Jung, Thomas; Large, William G.; Lee, Craig; Lique, Camille; Lu, Jianhua; Masina, Simona; Nurser, A. J. George; Rabe, Benjamin; Roth, Christina; Salas Y Melia, David; Samuels, Bonita L.; Spence, Paul; Tsujino, Hiroyuki; Valcke, Sophie; Voldoire, Aurore; Wang, Xuezhu; Yeager, Steve G.
The Arctic Ocean simulated in 14 global ocean-sea ice models in the framework of the Coordinated Ocean-ice Reference Experiments, phase II (CORE-II) is analyzed in this study. The focus is on the Arctic liquid freshwater (FW) sources and freshwater content (FWC). The models agree on the interannual variability of liquid FW transport at the gateways where the ocean volume transport determines the FW transport variability. The variation of liquid FWC is induced by both the surface FW flux (associated with sea ice production) and lateral liquid FW transport, which are in phase when averaged on decadal time scales. The liquid FWC shows an increase starting from the mid-1990s, caused by the reduction of both sea ice formation and liquid FW export, with the...
Tipo: Text
Palavras-chave: Arctic Ocean; Freshwater; Sea ice; CORE II atmospheric forcing.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00313/42463/41835.pdf

The Beaufort Gyre extent, shape, and location between 2003 and 2014 from satellite observations
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Regan, Heather; Lique, Camille; Armitage, Thomas W. K.
The Beaufort Gyre is a significant reservoir of freshwater in the Arctic. It is thought to play a key role in regulating Arctic freshwater discharge to the North Atlantic, and in recent decades its freshwater content has increased in a time of rapid Arctic change. Despite this, its exact dynamical behaviour is not fully understood. Here, we make use of an Arctic‐wide dataset of Dynamic Ocean Topography (DOT), including data under sea ice, to characterise the time‐varying extent, shape, and location of the Beaufort Gyre. We show that the gyre expanded towards the north‐west between 2003 and 2014, resulting in increased proximity to the Chukchi Plateau and Mendeleev Ridge by 2014. We find that the gyre strength and maximum DOT both respond readily to changes...
Tipo: Text
Palavras-chave: Arctic oceanography; Beaufort Gyre; Dynamic ocean topography; Freshwater.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00476/58763/61302.pdf

Freshwater and its role in the Arctic Marine System: sources, disposition, storage, export, and physical and biogeochemical consequences in the Arctic and global oceans
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Carmack, E. C.; Yamamoto-kawai, M.; Haine, T. W. N.; Bacon, S.; Bluhm, B. A.; Lique, Camille; Melling, H.; Polyakov, I. V.; Straneo, F.; Timmermans, M. -l.; Williams, W. J.
The Arctic Ocean is a fundamental node in the global hydrological cycle and the ocean's thermohaline circulation. We here assess the system's key functions and processes: 1) the delivery of fresh and low salinity waters to the Arctic Ocean by river inflow, net precipitation, distillation during the freeze/thaw cycle and Pacific Ocean inflows; 2) the disposition (e.g. sources, pathways and storage) of freshwater components within the Arctic Ocean; and 3) the release and export of freshwater components into the bordering convective domains of the North Atlantic. We then examine physical, chemical or biological processes which are influenced or constrained by the local quantities and geochemical qualities of fresh water; these include: stratification and...
Tipo: Text
Palavras-chave: Arctic; Oceans; Circulation; Freshwater; Carbon cycle; Acidification.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00313/42460/41831.pdf

Reproductive behaviour of two tilapia species ( Oreochromis niloticus , Linné, 1758; Sarotherodon melanotheron, Rüppel, 1852) in freshwater intra and interspecific pairing context
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Akian, Dieudonne; Yao, Kouakou; Clota, Frederic; Lozano, Paul; Baroiller, Jean Francois; Chatain, Beatrice; Begout, Marie-laure.
Nile tilapia Oreochromis niloticus (NT) and Black-chinned tilapia Sarotherodon melanotheron (BCT) are respectively characterized by fast growth and water salinity tolerance which attract the farmers who could take advantage of both species characteristics by producing hybrids reared in brackish or marine waters. Little information is however available about social interactions between the two species which are distinct by their mode of parental care (oral incubation). The objective of this study was to determine the behaviour of the two species, NT and BCT placed in freshwater intraspecific and interspecific pairing contexts. Females of both species (n = 20 per species) were first isolated for 90 days in a 60 L aquarium to determine the average duration...
Tipo: Text
Palavras-chave: Aggression; Hybridization; Reproduction; Oreochromis niloticus; Sarotherodon melanotheron; Freshwater.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00376/48673/49008.pdf

Arctic Ocean freshwater content and its decadal memory of sea-level pressure
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Johnson, Helen L.; Cornish, Sam B.; Kostov, Yavor; Beer, Emma; Lique, Camille.
Arctic freshwater content (FWC) has increased significantly over the last two decades, with potential future implications for the Atlantic meridional overturning circulation downstream. We investigate the relationship between Arctic FWC and atmospheric circulation in the control run of a coupled climate model. Multiple linear lagged regression is used to extract the response of total Arctic FWC to a hypothetical step increase in the principal components of sea‐level pressure. The results demonstrate that the FWC adjusts on a decadal timescale, consistent with the idea that wind‐driven ocean dynamics and eddies determine the response of Arctic Ocean circulation and properties to a change in surface forcing, as suggested by idealized models and theory....
Tipo: Text
Palavras-chave: Arctic Ocean; Climate change; Interannual variability; Freshwater; Adjustment timescales; Ocean dynamics.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00440/55117/56571.pdf

Pisorisporiales, a new order of aquatic and terrestrial fungi for Achroceratosphaeria and Pisorisporium gen. nov. in the Sordariomycetes
Provedor de dados: Naturalis Digital Academic Repository
Autores: Réblová, M.; Fournier, J.; Štěpánek, V.
Four morphologically similar specimens of an unidentified perithecial ascomycete were collected on decaying wood submerged in fresh water. Phylogenetic analysis of DNA sequences from protein-coding and ribosomal nuclear loci supports the placement of the unidentified fungus together with Achroceratosphaeria in a strongly supported monophyletic clade. The four collections are described as two new species of the new genus Pisorisporium characterised by non-stromatic, black, immersed to superficial perithecial ascomata, persistent paraphyses, unitunicate, persistent asci with an amyloid apical annulus and hyaline, fusiform, cymbiform to cylindrical, transversely multiseptate ascospores with conspicuous guttules. The asexual morph is unknown and no conidia...
Tipo: Article / Letter to the editor
Palavras-chave: Achroceratosphaeria; Freshwater; Hypocreomycetidae; Koralionastetales; Lulworthiales; Multigene analysis; Systematics.
Ano: 2015
URL: http://www.repository.naturalis.nl/record/560058

A new species of Echinogammarus Stebbing, 1899 (Crustacea, Amphipoda) from Moroccan freshwaters
Provedor de dados: Naturalis Digital Academic Repository
Autores: Fadil, Fatima; Dakki, Mohamed.
Systematic sampling has proved that members of the genus Echinogammarus are known from limited areas of Morocco. In this paper, we describe a new species of Echinogammarus (Crustacea, Amphipoda): Echinogammarus oujdae n. sp. from freshwater of the northeastern region with remarks on its affinities and ecology.
Tipo: Article / Letter to the editor
Palavras-chave: Amphipoda; Echinogammarus; Systematics; Freshwater; Morocco.
Ano: 2003
URL: http://www.repository.naturalis.nl/record/504766

A new species of sand-dwelling catfish, with a phylogenetic diagnosis of Pygidianops Myers (Siluriformes: Trichomycteridae: Glanapteryginae)
Provedor de dados: Neotropical Ichthyology
Autores: Pinna,Mário C. C. de; Kirovsky,Alexandre L.
A new species of sand-dwelling catfish genus Pygidianops, P. amphioxus, is described from the Negro and lower Amazon basins. The new species differs from its three congeners in the elongate eel-like body, the short barbels, and the small caudal fin, continuous with the body, among other traits of internal anatomy. The absence of anal fin further distinguishes P. amphioxus from all other Pygidianops species except P. magoi and the presence of eyes from all except P. cuao. The new Pygidianops seems to be the sister species to P. magoi, the two species sharing a unique mesethmoid with a dorsally-bent tip lacking cornua, and a produced articular process in the palatine for the articulation with the neurocranium. Pygidianops amphioxus is a permanent and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity; Freshwater; Psammophyly; Systematics; Teleostei.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000300004

Species or population? Systematic status of Vieja coatlicue (Teleostei: Cichlidae)
Provedor de dados: Neotropical Ichthyology
Autores: McMahan,Caleb D.; Matamoros,Wilfredo A.; Elías,Diego J.; Piller,Kyle R.
ABSTRACT Pacific and Atlantic-slope rivers of the Isthmus of Tehuantepec in Mexico contain two cichlid species of the genus Vieja relevant to the current study, V. zonata and V. coatlicue, respectively. The Atlantic-slope species was initially considered a population of uncertain taxonomic status and recently described as a distinct species based on three putatively diagnostic morphological characters. The objective of this study was to combine new and existing genetic data, along with reanalysis of morphological characters, to test the distinctiveness of V. coatlicue. Little genetic variability and no geographic structuring were recovered. Additionally, putatively diagnostic morphological character states were present across both species, failing to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cichlid; Freshwater; Mexico; River; Taxonomy.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000200204

Otocinclus batmani, a new species of hypoptopomatine catfish (Siluriformes: Loricariidae) from Colombia and Peru
Provedor de dados: Neotropical Ichthyology
Autores: Lehmann A.,Pablo.
A new species of the hypoptopomatine catfish genus Otocinclus is described from two localities in the upper Río Amazonas basin: a tributary of the Río Puré in Colombia and two tributaries to the Río Amazonas near Iquitos in Peru. The new taxon can be easily distinguished from all congeners, except Otocinclus cocama, by having a single, intensely pigmented, vertical W-shaped caudal fin spot and by having three discrete dark bands on dorsum, between the dorsal-fin base and the caudal fin. Otocinclus batmani differs from O. cocama by the absence of vertically elongated blotches from the dorsal midline to the ventral border of flanks, and by lacking a posterior extension of black pigmentation on the base of two central caudal-fin rays. Phylogenetic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neotropical; Systematics; Taxonomy; Freshwater; Corroncho; Cascudinho; Catfish.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000400001

Astyanax henseli, a new name for Tetragonopterus aeneus Hensel, 1870 from southern Brazil (Teleostei: Characiformes)
Provedor de dados: Neotropical Ichthyology
Autores: Melo,Filipe A. G. de; Buckup,Paulo A.
Tetragonopoterus aeneus Hensel (1870) is removed from synonymy with Astyanax fasciatus (Cuvier, 1819), revalidated and redescribed as A. henseli to avoid homonymy. Astyanax henseli differs from A. fasciatus stricto sensu and other Astyanax species by the presence of two to four maxillary teeth, two vertically-elongated humeral spots, dentary tooth cusps positioned close to one another, and the slender form of the dentary teeth.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Taxonomy; Astyanax fasciatus; Species complex; Rio Jacuí; Fish; Freshwater.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000100003

A new species of the armored catfish Parotocinclus (Loricariidae: Hypoptopomatinae), from the Amazon basin in Colombia
Provedor de dados: Neotropical Ichthyology
Autores: Lehmann A.,Pablo; Schvambach,Lucas J.; Reis,Roberto E.
A new species of hypoptopomatine cascudinho is described from a creek tributary to the Amazon River in Leticia, Amazonas Departament, Colombia. The new species of Parotocinclus is distinguished from congeners from northeastern to southeastern Brazilian rivers in having the cheek canal plate elongated posteriorly on the ventral surface of head and contacting the cleithrum. It is diagnosed from P. collinsae (Essequibo River basin, Guiana) and P. halbothi (rio Trombetas basin, Brazil and Marowijne River, Suriname), by having a triangular patch of dark pigmentation on the anterior portion of the dorsal-fin membrane, by the absence of unicuspid accessory teeth on both the premaxilla and dentary, and by having a Y-shaped light mark on the snout. The new species...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity; Freshwater; Leticia; Systematics; Taxonomy.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000100047

Diet and trophic ecomorphology of the silverside, Odontesthes bonariensis, of the Salto Caxias reservoir, rio Iguaçu, Paraná, Brazil
Provedor de dados: Neotropical Ichthyology
Autores: Cassemiro,Fernanda Aparecida da Silva; Hahn,Norma Segatti; Rangel,Thiago Fernando Lopes Valle de Britto.
This study aims to analyze the diet and trophic ecomorphology of Odontesthes bonariensis, relating these features with species' abundance in the natural environment and in the Salto Caxias reservoir (at Iguaçu river) after the reservoir's formation. The samples were carried out before (from March 1997 to February 1998- pre) and after (from October 1998 to February 2001 - post 1 and 2) the damming. The stomach contents of 218 individuals were analyzed by occurrence and volumetric methods. O. bonariensis' diet is based on insects, scales, plants and detritus. Microcrustaceans (Cladocera and Copepoda) were the main items, allowing the characterization of the species as zooplanktivore. The species has a superior position and protractible mouth, with small...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atherinidae; Feeding; Planktivory; Morphology; Freshwater.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252003000200007

A new species of sexually dimorphic Pareiorhaphis Miranda Ribeiro, 1918 (Siluriformes: Loricariidae) from the rio Doce basin, Brazil
Provedor de dados: Neotropical Ichthyology
Autores: Pereira,Edson H. L.; Vieira,Fábio; Reis,Roberto E.
Pareiorhaphis nasuta, a new neoplecostomine catfish of the family Loricariidae is described. The species was collected from headwaters of the rio Matipó, tributary of the upper rio Doce basin in State of Minas Gerais, Brazil. The new species is readily diagnosed from all remaining congeners by the longer snout and by the smaller orbital diameter. The new species is the first representative of the genus Pareiorhaphis discovered in the rio Doce basin, thus expanding its geographic distribution. A phylogenetic diagnosis for Pareiorhaphis is presented.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Freshwater; Taxonomy; Systematics; Neotropical; Catfish.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000400003

New species of Metynnis Cope, 1878 (Characiformes: Characidae) from the rio Paraguay basin, Mato Grosso State, Brazil
Provedor de dados: Neotropical Ichthyology
Autores: Pavanelli,Carla S.; Ota,Rafaela P.; Petry,Paulo.
A new species of Metynnis is described from the rio Cuiabá and rio Manso drainages, in the upper rio Paraguay basin, Mato Grosso State, Brazil. This laterally compressed species, which rarely exceeds 140 mm in SL, is readily distinguished from other members of the genus Metynnis by having 100-110 lateral-line scales, 48-56 rows of scales above the lateral line, 32-36 circumpeduncular scales, 22-24 gill rakers, 38 vertebrae, singular color pattern, and relatively smaller snout, width, and head length.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Taxonomy; Neotropical; Ostariophysi; Freshwater; Serrasalminae.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000200002

Spatial, seasonal and ontogenetic variation in the diet of Astyanax aff. fasciatus (Ostariophysi: Characidae) in an Atlantic Forest river, Southern Brazil
Provedor de dados: Neotropical Ichthyology
Autores: Wolff,Luciano Lazzarini; Abilhoa,Vinícius; Rios,Flavia Sant'Anna; Donatti,Lucélia.
This study described the feeding habits of the characin Astyanax aff. fasciatus. The diet compositions of specimens from two sites (A and B) on a river in Southern Brazil were compared according to the size of individuals and seasonal period. The collections were performed monthly from March 2005 to February 2006, where the stomach contents of 290 specimens were assessed. Food items for A. aff. fasciatus were basically composed of plants and insects, especially leaf fragments, seeds, fruits, filamentous algae, aquatic and terrestrial insects and insect fragments. At site A, the most common items were insect and plant fragments. Conversely at site B, plant fragments were more representative. In general, all items of animal origin showed the highest feeding...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Resource availability; Feeding flexibility; Omnivore; Niche shifts; Freshwater.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000200018

A new species of Bryconops (Ostariophysi: Characiformes: Characidae) from the upper rio Tocantins drainage, Brazil
Provedor de dados: Neotropical Ichthyology
Autores: Guedes,Tharles L. O.; Oliveira,Everton F.; Lucinda,Paulo H. F.
ABSTRACT A new species of the genus Bryconops , subgenus Bryconops , is described from the rio Conceição, a tributary to the rio Palma, upper rio Tocantins drainage, Tocantins State, Brazil. The new species is distinguished from all its congeners, except B. humeralis and B. vibex by the color pattern in vivo (dorsal, adipose, and caudal fins entirely orange). The new species is easily distinguished from B. humeralis and B. vibex by the absence of a humeral spot and by the lack of maxillary teeth (vs . presence of a single humeral spot and presence of 1-3 maxillary teeth on both sides). Furthermore, the new species is distinguished from B. vibex by the number of perforated lateral line scales (38-41 vs. 44-46).
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity; Freshwater; Rio Conceição; Systematics; Taxonomy.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000200220

Feeding aspects of Leporinus amblyrhynchus (Characiformes: Anostomidae) in the first stages of formation of a Neotropical reservoir, Brazil
Provedor de dados: Neotropical Ichthyology
Autores: Mendonça,Fernando Pereira de; Hahn,Norma Segatti; Loureiro-Crippa,Valdirene Esgarbosa.
Diet and feeding activity of Leporinus amblyrhynchus before, during and after the damming of the rio Corumbá (Goiás State March 1996 to February 1998) were investigated. The diet, evaluated using the Feeding Index (IAi), showed that this species presents an invertivore feeding habit, preying on basically Chironomidae larvae. The feeding activity, estimated using the quantity of food in the stomach during a 24-hour cycle, showed that the feeding occurs mainly in the daytime. Considering the feeding aspects of this species during the formation of the reservatório of Corumbá there were small variations in the parameters (diet and feeding activity) dealt in this study.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feeding ecology; Invertivory; Freshwater.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252004000300006

Feeding ecology of Rivulus luelingi (Aplocheiloidei: Rivulidae) in a Coastal Atlantic Rainforest stream, southern Brazil
Provedor de dados: Neotropical Ichthyology
Autores: Abilhoa,Vinícius; Vitule,Jean Ricardo Simões; Bornatowski,Hugo.
Feeding habits of the killifish Rivulus luelingi collected in a black water stream of the Coastal Atlantic Rainforest in southern Brazil were investigated. Eight samplings were made between April 2003 and January 2004. The diet, assessed through a similarity matrix with the estimated contribution values of food items, included microcrustaceans, aquatic immature insects (larvae and pupae), aquatic adult insects, terrestrial insects, insect fragments, spiders, and plant fragments. Differences in the diet according to temporal variations (months) were registered, but changes related with size classes evaluated and high/low precipitation period were not observed. The species presented an insectivorous feeding habit, and its diet in the studied stream was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diet; Feeding habits; Freshwater; Killifish; Neotropics.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000400010

The introduction of the African catfish Clarias gariepinus (Burchell, 1822) into Brazilian inland waters: a growing threat
Provedor de dados: Neotropical Ichthyology
Autores: Rocha,Gecely Rodrigues Alves.
The biology of the introduced species Clarias gariepinus in lagoa Encantada (Ilhéus, Bahia State) was studied. Samples were obtained with gillnets between May 2002 and February 2004. All individuals caught exceeded the average length at first maturity cited in literature. Males and females in maturation stages indicate that the species is already established in the lake.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Freshwater; Fish; Exotic species; Sharptooth catfish.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000400020

Diet and dental development of three species of Roeboides (Characiformes: Characidae)
Provedor de dados: Neotropical Ichthyology
Autores: Novakowski,Gisele Caroline; Fugi,Rosemara; Hahn,Norma Segatti.
Lepidophagy has been recorded in various species of Roeboides. In this study we analyzed ontogenetic variation in diet and dental development of three Roeboides species (R. paranensis, R. prognathus and R. microlepis). Roeboides paranensis consumed mainly insects, scales and microcrustaceans, and the smaller individuals (&lt;3.4 cm - SL) consumed mostly insects. Scale were only consumed by individuals greater than 3.4 cm. Scales were the dominant item in the diet in all sizes of R. prognathus. The diet of R. microlepis was composed primarily of whole fishes, however, the smaller individuals (&lt;5.4 cm) consumed only insects. During ontogeny, exterior migration of teeth in the mouth started at 3.7 cm in R. paranensis and 6.5 cm in R. microlepis. As body...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Roeboides; Lepidophagy; Freshwater; Reservoir.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252004000300008

Miniaturization in Otothyris Myers, 1927 (Loricariidae: Hypoptopomatinae)
Provedor de dados: Neotropical Ichthyology
Autores: Rosa,Alaina Cristine; Langeani,Fernanda de Oliveira Martins and Francisco.
Many species of freshwater fishes are considered miniatures, nevertheless, their identification as miniatures is frequently based only on an arbitrary criterion of small body size. Although some species of Otothyris had been suggested to be miniature, informations about the process and consequences of miniaturization in the genus are lacking. Here, we detail developmental events of loss, fusion, and modifications in several bones, the laterosensory system, and even the brain, that in sum demonstrate miniaturization in all species of the genus. Our results may be useful in the recognition of other miniature species of loricariids.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Freshwater; Heterochrony; Miniature; Neotropical region; Ontogeny.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252014000100053

A systematic revision of Tatia (Siluriformes: Auchenipteridae: Centromochlinae)
Provedor de dados: Neotropical Ichthyology
Autores: Sarmento-Soares,Luisa Maria; Martins-Pinheiro,Ronaldo Fernando.
The auchenipterid catfish genus Tatia is revised. Twelve species are recognized including three described as new. Tatia is diagnosed by the hyomandibula elongated anterodorsally, the anal-fin base of adult males reduced in length, and the caudal peduncle laterally compressed and deep with a middorsal keel. Tatia aulopygia occurs in the Madeira river drainage and is distinguished by the reduced cranial fontanel in adults and male modified anal fin with middle rays reduced in length. Tatia boemia, known from the upper Uruguay river drainage, is distinguished by its unique color pattern with dark chromatophores on the sides of body. Tatia brunnea from river basins in Suriname and French Guiana and the Negro river drainage, Amazon basin, is recognized by its...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: South America; Freshwater; Catfish; Taxonomy; Centromochlus.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000300022

Microglanis pataxo, a new catfish from southern Bahia coastal rivers, northeastern Brazil (Siluriformes: Pseudopimelodidae)
Provedor de dados: Neotropical Ichthyology
Autores: Sarmento-Soares,Luisa M.; Martins-Pinheiro,Ronaldo F.; Aranda,Arion T.; Chamon,Carine C.
A new pseudopimelodid catfish of the genus Microglanis, collected in small rivers at the lower and middle Peruípe, middle Jucuruçu and Cahy basins, in the southeastern coast of the Bahia state, is described. The new species has a comparatively high number of anal fin proximal radials, 12, shaped as thin tubes, the last one bearing a laminar extension; a pectoral fin spine with a bony point and with a smaller number of serrations on its posterior border; seven pleural ribs and a narrow head width. We provide information on the external morphology and also on some osteological features for the new species. A key to species is presented for the coastal drainages between Rio de Janeiro and Bahia states.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neotropical; Systematics; Freshwater; South America.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000200003

Use of functional traits to assess changes in stream fish assemblages across a habitat gradient
Provedor de dados: Neotropical Ichthyology
Autores: Ribeiro,Mariela Domiciano; Teresa,Fabrício Barreto; Casatti,Lilian.
Abstract Functional traits are important for understanding the links between species occurrence and environmental conditions. Identifying these links makes it possible to predict changes in species composition within communities under specific environmental conditions. We used functional traits related to habitat use and trophic ecology in order to assess the changes in fish community composition between streams with varying habitat structure. The relationship between the species traits and habitat characteristics was analyzed using an RLQ ordination analysis. Although species were widely distributed in habitats with different structures, physical conditions did favor some species based on their functional characteristics. Eight functional traits were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: RLQ analysis; Agroecosystem; Freshwater; Tropical fish; Morphology.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000100206

A new species of Roeboides (Teleostei: Characidae) from Costa Rica and Panama, with a key to the middle American species of the genus
Provedor de dados: Neotropical Ichthyology
Autores: Matamoros,Wilfredo A.; Chakrabarty,Prosanta; Angulo,Arturo; Garita-Alvarado,Carlos A.; McMahan,Caleb D.
A new species of Roeboides is described from the Pacific slope of Costa Rica and Panama. Roeboides bussingi differs from all other Central American Roeboides and all members of the R. guatemalensis species group by the following combination of characters: presence of 18-22 scales above the lateral line (vs. 12-16 in R. dientito); 15-22 scales below the lateral line (vs. 10-14 in R. dientito, and 20-24 in R. loftini); an inconspicuous, sometimes absent, crescent-shaped humeral spot (vs. a large round, conspicuous humeral spot in R. carti, R. dayi, R. dientonito, R. ilseae, R. loftini,and R. occidentalis); a small wedge-shaped spot that does not reach the lateral line (vs. a large spot crossing the lateral line in R. guatemalensis); a teardrop shaped caudal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Central America; Characinae; Distribution; Freshwater; Pacific Slope.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000200285

Isotopic profile and mercury concentration in fish of the lower portion of the rio Paraíba do Sul watershed, southeastern Brazil
Provedor de dados: Neotropical Ichthyology
Autores: Rocha,Adélia R. M.; Di Beneditto,Ana Paula M.; Pestana,Inácio A.; Souza,Cristina Maria M. de.
ABSTRACT The aim of this study was to evaluate the isotopic profile and mercury (Hg) concentrations in fish (carnivores, omnivores and detritivores) in the lower portion of the rio Paraíba do Sul watershed, southeastern Brazil. Carbon (δ13C) isotopic analyses revealed that pelagic and benthonic sources are part of the feeding of the fish from the different guilds (-14.0 to -24.8 ‰). The benthic sources are usually enriched in δ13C (-16.9‰, from watershed runoff) compared to pelagic sources because the phytoplankton, important primary producer that supports several pelagic chains, has δ13C signature lighter (-23.9‰). The nitrogen (δ15N) isotopic signatures indicated that most guilds were at the same trophic position (10.0 to 15.5 ‰), except for pelagic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbon; Freshwater; Hg; Nitrogen; Trophic guilds.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000400723

Astyanax paranae Eigenmann, 1914 (Characiformes: Characidae) in the Alagados Reservoir, Paraná, Brazil: diet composition and variation
Provedor de dados: Neotropical Ichthyology
Autores: Abelha,Milza Celi Fedatto; Goulart,Erivelto; Kashiwaqui,Elaine Antoniassi Luiz; Silva,Marlene Rodrigues da.
Aspects of the feeding ecology of a small characin, Astyanax paranae, were studied during 1996/1997 and 1998/1999 in the Alagados Reservoir, Paraná, Brazil (25º01'50.0'' S; 050º03'41.9'' W). Fishes were quarterly captured from the reservoir's riverine and lacustrine zones and stomachs contents of 711 adult individuals were analyzed by volumetric method. Species' feeding spectrum and spatial, temporal and sexual variations on diet were evaluated. Data matrix was summarized by detrented correspondence analysis (DCA) and the axes scores from DCA were used as variables in one-way ANOVA of null models to test diet variations. Astyanax paranae fed on detritus/sediment, plant matter, algae and aquatic and terrestrial invertebrates. The time-space prevalence of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish; Feeding; Dam; Detritivory; Freshwater.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000300006

Following food clouds: feeding association between a minute loricariid and a characidiin species in an Atlantic Forest stream, Southeastern Brazil
Provedor de dados: Neotropical Ichthyology
Autores: Leitão,Rafael P.; Caramaschi,Érica P.; Zuanon,Jansen.
Following behavior is a widespread feeding tactic among marine fishes, but remains poorly documented for freshwater fishes. The present study describes such association between two freshwater species: the minute armored catfish Parotocinclus maculicauda and the South American darter Characidium sp. During underwater observations in an Atlantic Forest stream, we recorded Characidium sp. closely following P. maculicauda (&lt;5cm), catching the particles dislodged by this catfish's grazing activity. The following behavior displayed by the darter is considered opportunistic and possibly favors the capture of preys associated to the periphyton. This study is one of the few records of nuclear-follower feeding association between freshwater fishes and the first...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Following behavior; Foraging habits; Freshwater; Hypoptopomatinae; Crenuchidae.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000300011

Parotocinclus halbothi, a new species of small armored catfish (Loricariidae: Hypoptopomatinae), from the Trombetas and Marowijne River basins, in Brazil and Suriname
Provedor de dados: Neotropical Ichthyology
Autores: Pablo Lehmann,A.; Lazzarotto,Henrique; Reis,Roberto E.
Parotocinclus halbothiis described as a new species from the Trombetas and Marowijne river basins, in Brazil and Suriname. The new species is distinguished from its congeners in the Guianas, Orinoco, and Amazon basins by details of color pattern, form and arrangement of bony plates, body shape, and morphometric features. It is distinguished from all other species of Parotocinclusby the elongation of the canal cheek plate on the ventral surface of head posteriorly to contact the cleithrum. The new species is differentiated from Parotocinclus collinsae, the most similar species in terms of color pattern, by the small, circular, median abdominal plates, the poorly developed preanal shield with two or three plates, and by having the adipose fin rudimentary....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon; Biodiversity; Freshwater; Miniature fish; Systematics.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252014000100027

Feeding habits and morphometry of Iheringichthys labrosus (Lütken, 1874) in the Uruguay River (Uruguay)
Provedor de dados: Neotropical Ichthyology
Autores: Masdeu,Malvina; Mello,Franco Teixeira-de; Loureiro,Marcelo; Arim,Matias.
Body size and diet of organisms are fundamental attributes which determine their ecology and natural history. Iheringichthys labrosus is one of the most common fish species of the Uruguay River. However, its natural history is poorly known and there is little information about its diet and interactions with other species. This paper describes the feeding habits of this species, relating feeding patterns to the size classes and morphometry of individuals and to the temporal variations. Fishes were captured in May and November of 2006 in three zones of the lower Uruguay River. A total of 101 stomach contents was analyzed (standard length: 60-224 mm). The species exhibited a broad feeding spectrum with most items belonging to the benthic community. We found...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diet; Freshwater; Natural history; Pimelodidae; Siluriformes.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000300019

Ituglanis cahyensis, a new catfish from Bahia, Brazil (Siluriformes: Trichomycteridae)
Provedor de dados: Neotropical Ichthyology
Autores: Sarmento-Soares,Luisa M.; Martins-Pinheiro,Ronaldo F.; Aranda,Arion T.; Chamon,Carine C.
A new trichomycterid catfish of the genus Ituglanis is described from the rio Palmares, a tributary of the rio Cahy in southeast Bahia State, Brazil. Ituglanis cahyensis is distinguished from all other congeners through a combination of characters, as the supraorbital laterosensory canal branch with pores s3 and s6 present, the low count of branched pectoral fin rays, and low number of paired ribs. It is further distinguished in proportional measurements, such as elongate nasal, maxillary, and rictal barbels, and small eye diameter.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Catfish; Systematics; Trichomycterus; Freshwater; Southeastern Bahia.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000300002

Parotocinclus arandai, a new species of hypoptopomatine catfish (Siluriformes: Loricariidae) from the upper rios Jucuruçu and Buranhém, States of Bahia and Minas Gerais, Brazil
Provedor de dados: Neotropical Ichthyology
Autores: Sarmento-Soares,Luisa Maria; Lehmann A.,Pablo; Martins-Pinheiro,Ronaldo Fernando.
Parotocinclus arandai, new species of the hypoptopomatine catfish, is described from small creeks in the upper rios Jucuruçu and Buranhém basins, at the border of Brazilian States of Bahia and Minas Gerais. Parotocinclus arandai is distinguished from all congeners from the Atlantic coastal basins of southeastern and eastern Brazil, except Parotocinclus bahiensis, by having the branched rays and interradial membranes of the pectoral and pelvic fins unpigmented in ventral view. The new species is distinguished from most Parotocinclus species, by having a small eye, 14.8-19.3 mm HL (except P. maculicauda and P. planicauda) and by the presence of a tuft of hypertrophied odontodes on the supraoccipital (except P. cristatus and P. cesarpintoi). Parotocinclus...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neotropical; Systematics; Cascudinho; Freshwater; Hypoptopomatinae.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000200009

Stability and spatio-temporal structure in fish assemblages of two floodplain lagoons of the lower Orinoco River
Provedor de dados: Neotropical Ichthyology
Autores: González,Nirson; Lasso,Carlos; Rosales,Judith.
Fish assemblage structure and variability were analyzed in two floodplain lagoons (Las Arhuacas and Los Cardonales) along the lower Orinoco over a hydrological cycle. Every three months during continuous three-day sampling, experimental gill nets (5 to 12.5 cm of mesh opening) and 1 mm-mesh seine nets were utilized according to the types of habitats presents. A total of 133 fish species were found in Las Arhuacas and 95 species in Cardonales. Fifty five and 17 species were exclusive to Las Arhuacas and Los Cardonales respectively, and 77 were common to both lagoons. In Las Arhuacas, the most speciesrich orders were Characiformes, Siluriformes, Perciformes and Gymnotiformes and in Los Cardonales, the most species-rich orders were Characiformes,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neotropical; Freshwater; Communities; Seasonality; Venezuela.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000400022

Water quality trends and input loads to Lake Nakuru
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Kulecho, Andrew; Muhandiki, Victor.
Water quality trends of Lake Nakuru, Kenya and its feeder streams were monitored in 2001-2004. Water samples were obtained from eleven stations in the lake and five points on inflowing streams. The items monitored were physico-chemical and biological components. The drainage basin was characterized by recurrence of dry spells throughout the period with water losses in the lake exceeding the amount received to cause a fall in water volume. The lake water salts content rose – conductivity and alkalinity reached 58 ms/cm and 5,200 mg/l respectively. PH was more or less constant (10.00 – 10.36). Daytime oxygen concentration in the mid-lake system rose (to greater than 20 mg/l) while remaining low in the inflow portions of the lake. On one occasion, the lake...
Tipo: Proceedings Paper
Palavras-chave: Water quality; Biomass; Mortality causes; Anthropogenic factors; Phytoplankton; Pollution effects; Degradation; Man-induced effects; Inland waters; Freshwater pollution; Physicochemical properties; Inflow; Environmental monitoring; Land use; Urbanization; Environmental impact; Pollution; Freshwater.
Ano: 2006
URL: http://hdl.handle.net/1834/5312

The abundance, biomass and composition of pelagic ciliates in East African lakes of different salinity and trophy
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Yasindi, A. W.; Taylor, W. D.
Planktonic ciliates were studied in 17 tropical East African lakes of different salinity and trophic status. Oligotrichs (e.g., Strombidium, Strobilidium and Halteria) and scuticociliates (e.g., Cyclidium, Pleuronema, Cristigera), dominated the ciliate communities. Conductivity and trophic status were the most important environmental variables influencing the distribution of ciliate species in East African lakes. Herbivorous oligotrichs were important in oligotrophic and mesotrophic lakes, as they are in temperate and subtropical lakes, but their importance decreased with increasing chlorophyll a concentration and conductivity. On the other hand, the importance of scuticociliates (primarily bacterivores) increased with increasing chlorophyll a and...
Tipo: Proceedings Paper
Palavras-chave: Freshwater lakes; Abundance; Biomass; Pelagic environment; Salinity; Plankton; Community composition; Oligotrophic lakes; Aquatic communities; Regression analysis; Tropical lakes; Species diversity; Plankton; Freshwater.
Ano: 2006
URL: http://hdl.handle.net/1834/5311

Relative growth and population dynamics of Macrobrachium iheringi (Decapoda, Palaemonidae)
Provedor de dados: Papéis Avulsos de Zoologia
Autores: Nogueira,Caio dos Santos; Perroca,Júlia Fernandes; Piantkoski,Emerson Luiz; Costa,Rogerio Caetano da; Taddei,Fabiano Gazzi; Fransozo,Adilson.
Abstract During the ontogenetic development of crustaceans, the relative growth of some structures may change, especially during the transition from juvenile to adult. This study describes the relative growth of body structures of Macrobrachium iheringi, and provides information on its population dynamics, such as structure, fecundity, and morphological sexual maturity. The sampling of M. iheringi was carried out in “Ribeirão da Hortelã”, in Botucatu (SP, Brazil). The length of the carapace (CL), abdomen (AL), and ischium (IL), merus (ML), carpus (CrL), propodus (PpL), and dactyl (DcL) of the second right pereopod were measured. In addition, the width of the second abdominal pleura (PW) and propodus height (PpH) were included in analyses. The relationships...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Freshwater; Caridea; Populations; Sex-ratio.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492019000100208

Variation in the distribution of Corbicula species (Mollusca: Bivalvia: Corbiculidae) after 25 years of its introduction in the Río de la Plata, Argentina
Provedor de dados: Revista Brasileira de Zoologia
Autores: Reshaid,Yamila; Cao,Luciana; Brea,Francisco; Blanche,María Ortiz; Torres,Santiago; Darrigran,Gustavo.
ABSTRACT In 1981, Corbicula fluminea (Müller, 1774) and C. largillierti (Philippi, 1844) were recorded at the Río de la Plata River. During the 1980’s, C. largillierti was found on a continuous fringe in the shore of that river, while C. fluminea was only found North of Buenos Aires’ harbor. Ten years later, C. fluminea spread to Punta Indio, while C. largillierti remained restricted to tributary streams. The density and size frequency distribution of both species were compared with previous data from samples performed in the same area in 1985-1989. The aim of this research was to determine whether the densities of both species decreased; whether C. fluminea is still more abundant than C. largillierti; and whether the size frequency distributions indicate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bivalves; Freshwater; Invasion; Invertebrates; Mussel.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702017000100336

Looking through a dirty glass: how different can the characterization of a fish fauna be when distinct nets are used for sampling?
Provedor de dados: Revista Brasileira de Zoologia
Autores: Ceni,Gianfranco; Vieira,João Paes.
The present study compares fish species composition, dominance, and size-structure patterns at an open sand beach area (32°15'S, 52°46'W) in Mirim Lake, RS, Brazil, estimated from samples collected with two distinct beach seine nets. The BS-9m net is 9 m long and 1.5 m high, and is made with a 5 mm multifilament mesh on its central portion and 12 mm on the side wings. The BS-30m net is 30 m long and 1.8 m high, with a 12 mm monofilament nylon mesh all over the net, except for a 30 cm strip made with a 12 mm multifilament mesh on the lower portion. Thirty hauls were performed with both nets resulting in a total of 849 fish captured, comprising 34 species. BS-9m was selective for individuals smaller than 60 mm TL and BS-30m for individuals larger than 60 mm...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Freshwater; Gear; Littoral zone; Sampler comparison.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702013000500005

Considerations regarding the dominance of Cylindrospermopsis raciborskii under low light availability in a low phosphorus lake
Provedor de dados: Acta Botanica Brasilica
Autores: Tonetta,Denise; Hennemann,Mariana Coutinho; Brentano,Débora Monteiro; Petrucio,Mauricio Mello.
ABSTRACTAlthough many studies have shown that the dispersion, increased abundance and dominance of cyanobacteria can be attributed to nutrient enrichment, we discuss features contributing to the dominance of Cylindrospermopsis raciborskii in a shallow, polymictic, subtropical coastal lake with low phosphorus and light limitation (Peri Lake). The presence and dominance of C. raciborskii in an environment with such characteristics emphasizes the idea that nutrients alone do not explain the high density of this cyanobacterium. Other features should be considered in explaining this species dominance, such as phosphorus storage and physiological flexibilitywhich seem to be key features to high densities in low phosphorus systems.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Cyanobacteria; Cyanotoxins; Freshwater; Nutrients; Peri Lake; Phytoplankton; Plasticity; Subtropical.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000300448

Taxonomic studies of centric diatoms (Diatomeae): unusual nanoplanktonic forms and new records for Brazil
Provedor de dados: Acta Botanica Brasilica
Autores: Cavalcante,Kaoli Pereira; Tremarin,Priscila Izabel; Ludwig,Thelma Alvim Veiga.
There have been few taxonomic studies of centric diatoms in lotic freshwater environments in Brazil, especially in terms of those including nanoplanktonic forms, which are often neglected in studies of local floras, because of their small size or confusing taxonomy. This is the first study focusing on centric diatoms in the flora of the state of Bahia, in northeastern Brazil. Plankton and periphyton attached to Eichornia crassipes were collected in the winter of 2009 in the Cachoeira River. The diatoms were analyzed and described under light and electron microscopies. Seventeen infrageneric taxa were identified. Cyclotella was represented by five taxa, and concerning of similarities between diacritical features of species in this genus, their descriptions...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bahia; Coscinodiscophyceae; Freshwater; Mediophyceae; River.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000200001

Espectro alimentar e variação sazonal da dieta de Plagioscion squamosissimus (Heckel, 1840) (Osteichthyes, Sciaenidae) na lagoa do Piató, Assu, Estado do Rio Grande do Norte, Brasil - DOI: 10.4025/actascibiolsci.v31i3.2140
Provedor de dados: Acta Scientiarum: Biological Sciences
Autores: Costa, Simone Almeida Gavilan Leandro da; UERN; Peretti, Danielle; UERN; Pinto Júnior, José Egberto Mesquita; UERN; Fernandes, Maria Aparecida; UERN; Gurgel Júnior, Antonio Maria; UERN.
Avaliaram-se a dieta e as variações sazonais na alimentação de Plagioscion squamosissimus, capturados mensalmente, na lagoa do Piató, Assu, Estado do Rio Grande do Norte, entre agosto de 2004 e julho de 2005, com despescas em horários específicos. Em laboratório, após a biometria, os peixes foram abertos e eviscerados. Sob microscópio estereoscópico, analisaram-se os conteúdos estomacais, cujos itens, depois de identificados, tiveram o seu volume medido. Foram calculadas as frequências de ocorrência e volumétrica e o índice alimentar. Agruparam-se os itens em sete categorias principais, e camarão e insetos foram as predominantes. A categorização dos itens permitiu classificar a espécie como carnívora com tendência a carcinofagia-insetivoria. Quanto à...
Tipo: Dieta; indice alimentar; variação sazonal
Palavras-chave: 2.00.00.00-6    Ciências Biológicas Plagioscion squamosissimus; Alimentação; Água doce; Índice alimentar Ecologia Plagioscion squamosissimus; Feeding; Freshwater; Food index.
Ano: 2009
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/2140

Biodiversity and ecology of the parasitic infracommunities of Loricaria prolixa (Siluriformes: Loricariidae) from the Tietê-Batalha Basin, SP, Brazil
Provedor de dados: Acta Scientiarum: Biological Sciences
Autores: Pelegrini, Larissa Sbeghen; Januário, Felipe Freitas; Azevedo, Rodney Kozlowisky de; Abdallah, Vanessa Doro.
  The parasitic biodiversity of the Loricaria prolixa, an endemic fish from the Paraná and Prata basins was studied and analyzed the parasitic’s communities dynamics and their ecological relations with this host. Samples were collected in the Batalha River and 39 specimens were analyzed from 2014 to 2016. All fishes were parasitized. The component community was composed by twelve species with 8694 metazoan found on the surface, gills, eyes, brain, intestine and blood of the hosts. Demidospermus spirophallus, Diplostomidae gen. sp., Rhabdochona kidderi and Oligobdella sp. showed higher values for the parasitism's ecological descriptors, and were centrals and dominants species. The infracommunities were characterized by specific richness smaller in relation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 2.13.02.02-2; 2.13.01.02-6 catfishes; Fish parasites; Freshwater; Biological diversity. Helmintologia animal; Protozoologia parasitária animal.
Ano: 2018
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/36294

Effect of indigo dye effluent on the growth, biomass production and phenotypic plasticity of Scenedesmus quadricauda(Chlorococcales)
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: CHIA,MATHIAS A.; MUSA,RILWAN I.
The effect of indigo dye effluent on the freshwater microalgaScenedesmus quadricauda ABU12 was investigated under controlled laboratory conditions. The microalga was exposed to different concentrations of the effluent obtained by diluting the dye effluent from 100 to 175 times in bold basal medium (BBM). The growth rate of the microalga decreased as indigo dye effluent concentration increased (p &lt;0.05). The EC50 was found to be 166 dilution factor of the effluent. Chlorophyll a, cell density and dry weight production as biomarkers were negatively affected by high indigo dye effluent concentration, their levels were higher at low effluent concentrations (p &lt;0.05). Changes in coenobia size significantly correlated with the dye effluent concentration. A...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Freshwater; Microalgae; Morphological variation; Pollution; Textile waste.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100419

Effect of cortisol on some osmoregulatory parameters of the teleost, Oreochromis niloticus L., after transference from freshwater to seawater
Provedor de dados: Arquivo Brasileiro de Medicina Veterinária e Zootecnia
Autores: Fontaínhas-Fernandes,A.; Gomes,E.F.; Reis-Henriques,Mª.A.; Coimbra,J.
This trial was conducted in order to determine the effects of cortisol on salt water acclimation of tilapia Oreochromis niloticus (L.). Tilapia (n=42) were injected intraperitoneally with cortisol and then were directly transferred from freshwater (FW) to 15‰ salt water (SW). Changes in plasma osmolality, chloride ion concentration (Cl-), plasma level of cortisol and gill Na+, K+-ATPase activity were measured at 6, 12, 24, 48, 72 and 168 hours after transference to 15‰ SW. Plasma osmolality and Cl- increased immediately after transference until 12-24 h. The fish injected with cortisol (F) showed higher plasma levels of cortisol than those from control group (C) that maintained the initial levels during the experiment. Gill Na+, K+-ATPase activity of C fish...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tilapia Oreochromis niloticus; Freshwater; Salt water; Cortisol.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352003000500008

Fish fauna of the Pelotas River, Upper Uruguay River, southern Brazil
Provedor de dados: Biota Neotropica
Autores: Delariva,Rosilene Luciana; Neves,Mayara Pereira; Baumgartner,Gilmar; Baumgartner,Dirceu.
Abstract: The fish fauna of the Pelotas River, in the Upper Uruguay ecoregion of southern Brazil was inventoried. Samplings were performed quarterly between August 2013 and May 2014 at 14 sites in the Pelotas River and its tributaries, using gill nets of different mesh sizes, sein nets, cast nets and electrofishing. In total, 7,745 specimens were recorded, comprising 46 species, belonging to 13 families and five orders. Approximately 80% of the species belonged to the orders Characiformes and Siluriformes, as well as the families Characidae and Loricariidae, which included a greater number of species. Of the total species, 24% were endemic to the Upper Uruguay River, four were identified only at the genus level and none was considered non-native....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Freshwater; Upland river; Ichthyofauna; Inventory; Species richness.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032019000300308

Fish fauna from the Paranapanema River basin, Brazil
Provedor de dados: Biota Neotropica
Autores: Jarduli,Lucas Ribeiro; Garcia,Diego Azevedo Zoccal; Vidotto-Magnoni,Ana Paula; Casimiro,Armando Cesar Rodrigues; Vianna,Norberto Castro; Almeida,Fernanda Simões de; Jerep,Fernando Camargo; Orsi,Mario Luis.
Abstract: The Paranapanema River is an important, extensively explored tributary of the Upper Paraná River basin. The fish fauna of the Paranapanema River has been investigated since the 1990s; however, no study has characterized the richness of fish species throughout the basin, including the main channel of the river, marginal lagoons, its tributaries, and sub-tributaries. Thus, we performed a review with 90 independent studies conducted at the upper, middle, and lower sections of the basin. We recorded 225 species, of which 165 were native, and 60 were non-native. We found that 77% of the species within the basin are composed by Siluriformes and Characiformes. Cichliformes had a significant number of non-native species established in impoundment...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Freshwater; Neotropical region; Species inventory; Upper Paraná River.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032020000100201

Range extension of Boeckella bergi Richard, 1897 (Crustacea: Copepoda: Centropagidae), with comments on the taxonomy of the species
Provedor de dados: Biota Neotropica
Autores: Previattelli,Daniel; Perbiche-Neves,Gilmar; Menu Marque,Silvina; Rocha,Carlos Eduardo Falavigna da.
We present new records of Boeckella bergi at several water bodies in Argentina and Brazil. Within these records the northernmost and southernmost limits of occurrence of B. bergi in South America are included. The ample range of distribution is consistent with former studies, but it is more extensive than previously known. Observations on habitat preferences are also made. This species is tolerant to temperate climate conditions in this region of South America, with wide amplitude of temperature between summer and winter seasons, and irregular patterns of precipitation.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biogeography; Distribution range; Freshwater; Copepoda; South America; Zooplankton.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032015000300101

Ichthyofauna of lotic environments in the Ivinhema river basin, upper Paraná river, Mato Grosso do Sul state, Brazil
Provedor de dados: Biota Neotropica
Autores: Vicentin,Wagner; Ferreira,Fabiane Silva; Súarez,Yzel Rondon.
Abstract: In order to inventory the species richness and fish fauna composition along the Ivinhema river basin, 232 stretches of rivers and streams were sampled from 2000 to 2018, using a rectangular sieve, trawls, gillnets, cast nets, and electrofishing. A total of 141 species was caught in the basin, including seven orders and 35 families. For the recorded species, 42 are from the upper Paraná river, 51 from lower Paraná river, 27 from other basins, two from other continents, and the origin for 19 species are unknown/not reported. Six species are registred for the first time in the upper Paraná river basin: Astyanax abramis, Moenkhausia oligolepis, Serrapinnus kriegi, Curimatopsis myersi, Pyxiloricaria menezesi, and Cichlasoma dimerus. This is the first...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish communities; Freshwater; Survey.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032019000400302

Fishes from the Jaru Biological Reserve, Machado River drainage, Madeira River basin, Rondônia State, northern Brazil
Provedor de dados: Biota Neotropica
Autores: Costa,Igor David; Ohara,Willian Massaharu; Almeida,Missilene.
Abstract: This work assessed freshwater fishes collected at 12 stations located along the Tarumã River, middle Machado River, Madeira River basin. The fieldwork took place in May and September 2015 during the high and low water seasons, respectively. We gathered 1,482 specimens representing seven orders, 30 families, 54 genera and 74 species using seine, gill, and hand nets. The family Characidae was the most representative, exhibiting the highest number of species captured. The species with the greatest abundance were Hemigrammus vorderwinkleri, Hyphessobrycon bentosi, Hemigrammus cf. bellottii, Bryconella pallidifrons, and Apistogramma resticulosa. Two species that remained unidentified are probably a new species. This study represents the third fish...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon; Freshwater; Conservation; Ichthyofauna; Inventory.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032017000100307

Fish fauna in forested and rural streams from an ecoregion of high endemism, lower Iguaçu River basin, Brazil
Provedor de dados: Biota Neotropica
Autores: Delariva,Rosilene Luciana; Neves,Mayara Pereira; Larentis,Crislei; Kliemann,Bruna Caroline Kotz; Baldasso,Mara Cristina; Wolff,Luciano Lazzarini.
Abstract The fish fauna of eight streams with different land uses of their watersheds (forested and rural areas) in the lower Iguaçu River basin was inventoried, in order to evaluate the composition and species richness. The fishes were sampled quarterly from May 2015 to February 2016, using the electrofishing technique. In total, 4,239 individuals were captured, belonging to six orders, 11 families and 26 species. The orders Siluriformes and Characiformes, and the families Characidae and Trichomycteridae were the most specious. Of the total species sampled, 65% were endemic to the Iguaçu River basin, four are not described and four are non-native. As expected to the Iguaçu River basin, the inventoried fauna revealed low richness and high endemism, however...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Freshwater; Ichthyofauna; Inventory; Iguassu ecoregion; Land use.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032018000300304

Epiphytic diatoms (Diatomeae) from Piraquara II urban reservoir, Paraná state
Provedor de dados: Biota Neotropica
Autores: Marra,Raquel Cristina; Tremarin,Priscila Izabel; Algarte,Vanessa Majewski; Ludwig,Thelma Veiga.
Abstract We conducted a taxonomical study of epiphytic diatoms on the macrophytes Polygonum hydropiperoides, Ludwigia peruviana and Alternanthera philoxeroides collected in the mesotrophic reservoir Piraquara II flooded in 2009, located in the state of Paraná. A total of 135 infrageneric taxa were identified, among them five at generic level and other five are first records to the state. We provided illustration, valve metrics, meristics limits and taxonomic reference for each taxon. Also, life forms and species frequency are given. The most frequent diatoms totalized 15.3% of total identified taxa and sporadic species represented 54.7%. Achnanthidium minutissimum (Kützing) Czarnecki and Brachysira neoexilis Lange-Bertalot occurred in more than 90% of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacillariophyta; Freshwater; Macrophytes; Mesotrophic; Periphyton; Taxonomy.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032016000400303

Protozooplankton and its relationship with environmental conditions in 13 water bodies of the Mogi-Guaçu basin - SP, Brazil
Provedor de dados: Biota Neotropica
Autores: Bagatini,Inessa Lacativa; Spínola,Ana Lúcia Gerardi; Peres,Bianca de Miranda; Mansano,Adrislaine da Silva; Rodrigues,Mafalda Alexandra Antunes; Batalha,Marco Antônio Portugal Luttembarck; Lucca,José Valdecir de; Godinho,Mirna Januária Leal; Tundisi,Takako Matsumura; Seleghim,Mirna Helena Regali.
Protozooplankton is an important component of the aquatic microbial food webs and its composition, density, and distribution reflect the chemical, physical, and biological aspects of the environment. Considering the scarce literature on freshwater protozoans in Brazil and on protozoan ecology in subtropical environments, we listed the ciliates and amoebae taxa found in 13 water bodies in São Paulo State and analyzed their abundance in relation to the environmental variables. We collected two samples in each environment, fixed immediately with mercuric chloride and stained with bromophenol blue. After microscopical analysis, 74 protozoan genera were identified and the Ciliophora were dominant in the majority of the environments. The Stichotrichia,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ciliates; Amoebae; Plankton; Environmental variables; Freshwater.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032013000400152

Zooplankton (Copepoda, Rotifera, Cladocera and Protozoa: Amoeba Testacea) from natural lakes of the middle Rio Doce basin, Minas Gerais, Brazil
Provedor de dados: Biota Neotropica
Autores: Maia-Barbosa,Paulina M.; Menendez,Rosa Maria; Pujoni,Diego Guimarães Florencio; Brito,Sofia Luisa; Aoki,Akemi; Barbosa,Francisco Antônio Rodrigues.
A list of zooplankton species identified during ten years of studies in the lake system of the middle Rio Doce basin is presented. This lake system integrates the Atlantic Forest biome, a biodiversity hotspot. Three types of studies were achieved by the Brazilian Long Term Ecological Research Program (Brasil-LTER/PELD-UFMG site 4): i) a temporal study (study 1) which sampled four lakes monthly and three lakes twice a year during ten years; ii) a comparative study of limnetic and littoral species composition (study 2) and iii) a spatial study (study 3) that evaluated the species composition of eighteen lakes (eight lakes inside the Rio Doce State Park (RDSP) and ten lakes in its surrounding area) during one year with quarterly sampling. A total of 354...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Species list; Atlantic Forest; Freshwater.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032014000100200

Periphytic algae in a floodplain lake and river under low water conditions
Provedor de dados: Biota Neotropica
Autores: Bichoff,Andressa; Osório,Nicolli Cristina; Dunck,Bárbara; Rodrigues,Liliana.
Abstract Drought events will become more frequent due the climate change. In floodplains, periphytic algae are responsible for part of the primary production, are the principal source of organic carbon deposition, play an important role in mineralization and nutrient cycling, and are the base of the food web for many organisms. As algae distribution in aquatic environments is a strong indicator of physical and chemical conditions of the sites, we aimed to determine the structure of periphytic algae in lentic and lotic environments during drought conditions and to uncover the main local abiotic factors in community structuring. We hypothesized diatoms would be more frequent than green algae and desmids at both sites, due to their resistance characteristics,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diatoms; Flood pulse; Freshwater; Drought events.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032016000300201

Feeding and trophic ecomorphology of Satanoperca pappaterra (Pisces, Cichlidae) in the Manso Reservoir, Mato Grosso State, Brazil
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Hahn,Norma Segatti; Cunha,Fabiane.
The aim of this work was to evaluate the relationship between diet and features of the trophic ecomorphology of Satanoperca pappaterra (Heckel, 1840) in an impacted environment. Samples were collected from March 2000 to February 2003 in Manso Reservoir, Cuiabá River, Mato Grosso State. Analysis of 93 stomachs contents showed that food resources associated with the substrate, such as plant remains, detritus, fish scales and Chironomidae larvae, dominated the diet. Consequently this species was characterized as a detritivorous-invertivorous. However, individuals collected in 2003 showed a greater selection of benthic organisms in relation to previous periods. Morphological structures such as position of the mouth, form of the lips, gill rakers and pharyngeal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cichlidae; Diet; Morphology; Freshwater.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000800017

Diet of Iheringichthys labrosus (Pimelodidae, Siluriformes) in the Itaipu Reservoir, Paraná River, Brazil-Paraguay
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Abes,Sara da Silva; Agostinho,Angelo Antonio; Okada,Edson Kiyoshi; Gomes,Luiz Carlos.
Iheringichthys labrosus is a secondary commercial fish species in the Itaipu Reservoir, but it is important in other reservoirs of the basin. However, little information exists about this species in the literature. The purpose of this study was to describe the diet of this species in the Itaipu Reservoir. Stomachs of 306 fishes were analyzed, collected from October 1994 to September 1996 in the differents zones of the reservoir (according to a longitudinal gradient). The reservoir was separated into riverine (upper reach), transitional (middle reach), and lacustrine (next to the dam) zones. Main items in the diet of I. labrosus were aquatic insects (mainly Chironomidae) and mollusks (mainly Bivalvia). Their presence in the diet did not vary according to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Itaipu Reservoir; Freshwater; Fish; Feeding; Diet composition; Benthophagous.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132001000100014

Phytoplankton community of a polymictic reservoir, La Plata River basin, Uruguay
Provedor de dados: Brazilian Journal of Biology
Autores: PÉREZ,M. C.; BONILLA,S.; MARTÍNEZ,G.
This paper deals with the analysis of phytoplankton composition and abundance from four sampling stations at the polymictic system, Rincón del Bonete water reservoir in Uruguay. Sampling data were obtained in 4 seasonal periods between February and November 1993. A hundred and twenty-four taxa were identified, where Aulacoseira granulata (Ehrenb.) Simon., A. granulata var. angustissima (Muller) Simon., A. granulata var. angustissima f. spiralis, (Muller) Simon., A. cf. ambigua, (Grun.) Simon., A. cf.. distans (Ehrenb.) Simon., Cryptomonas spp. and Synedra ulna (Nitzsch) Ehrenberg, were always present. Phytoplankton abundance fluctuated between 29 (autumn) and 2129 (summer) ind/ml. The general dominance of Aulacoseira spp. could be related to the polymictic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microalgae; Freshwater; Artificial lakes; Aulacoseira; Uruguay.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000400002