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Registros recuperados: 17
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Les dinophycées pélagiques et benthiques du Golfe de Gascogne sud de la Bretagne à Arcachon ArchiMer
Paulmier, Gerard.
Les microphytes planctoniques et benthiques du Golfe de Gascogne sont relativement diversifiés. Cette diversification est probablement en rapport avec la situation hydrologique particulière de cette région enrichie par des mélanges de masses d'eau de diverses origines et par des apports continentaux importants. Dans ce contexte, les dinophycées sont nombreuses et variées et occupent toutes les niches écologiques. 230 taxons ont été répertoriés. Quelques espèces sont connues pour provoquer périodiquement des colorations de la mer "eaux rouges" et quelques-unes sont maintenant redoutées pour leur toxicité.
Tipo: Text Palavras-chave: Zone pélagique; Zone benthique; Phytoplancton; Diversité espèces; Niche écologique; Inventaire floristique; Cycle développement; Répartition géographique; Morphologie; Pyrrophycophyta; Golfe de Gascogne; Bretagne; Landes; Algae; Thallophyta; Océan Atlantique Nord; Océan Atlantique; France; Europe; Aquitaine; Pelagic zone; Benthic zone; Phytoplankton; Species diversity; Niche; Floral survey; Life cycle; Geographic distribution; Morphology; Pyrrophycophyta; Bay of Biscay; Bretagne; Landes; Algae; Thallophyta; North Atlantic; Atlantic Ocean; France; Europe; Aquitaine.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/00260/37097/35613.pdf
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Dimensionamento e sobreposição de nichos dos portunídeos (Decapoda, Brachyura), na Enseada da Fortaleza, Ubatuba, São Paulo, Brasil Zoologia
Pinheiro,Marcelo Antonio Amaro; Fransozo,Adilson; Negreiros-Fransozo,Maria Lúcia.
The niche breadth of the Portunidae and their overlap on the subtidal sediments of Fortaleza bay, Ubatuba (São Paulo) was analyzed. Samples were made monthly from November/1988 to October/1989, inseven areas of the bay using a shrimp fishery boat equipped with two otter-trawls. Each area was characterized based on environmental factors such as depth, temperature, salinity, dissolved oxygen, organic matter and granulometric composition of the sediment. The number of individuais of each species was registered to each area (resource). Levins's standardized measure (BA) and niche percentage were calculated. Five species of swimming crabs were recorded in this study: Callinectes ornatus Ordway, 1863, Arenaeus cribrarius (Lamarck, 1818), Portunus spinimanus...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Portunidae; Distribution; Niche; Sediment; Swimming crab.
Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751997000200010
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A new study method of microhabitat structure of small mammals BJB
CERQUEIRA,R.; FREITAS,S. R..
The variables in habitat studies are usually transformed in such a way that they become abstractions and intuition is lost. We tested a new method for the analysis of habitat using data collected in a grid laid at the "restinga de Maricá", in Rio de Janeiro State, Brazil. Thirty-seven microhabitat variables were measured at each trap station. We assume that these variables characterize the microhabitat structure at the moment when measurements were taken. The data are transformed in 3 ways: (1) the averages of the measured variables were calculated, as usual in habitat studies; (2) the data are transformed in densities per area in square meters without reduction in the number of variables; and (3) we calculated the natural logarithms of the data thus...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Discriminant analysis; Methods; Niche; Neotropics; Small mammals.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000200006
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The coexistence of species La coexistencia de especies RChHN
GORDON,CALEB E..
This paper is a critical literature review on the topic of the coexistence of similar species within ecological communities. A conceptual framework is provided for dividing coexistence studies and concepts into three distinct time scales. The first six sections deal primarily with ecological-scale, or mesoscale coexistence, defined as coexistence in the classic sense of the competitive exclusion principle and Lotka-Volterra models, wherein interacting populations have had enough time to reach equilibrium. The first four sections briefly review resource partitioning studies and competitive coexistence models, and discuss the relative contributions of, and interaction between empirical and theoretical approaches to the problem of ecological-scale...
Tipo: Journal article Palavras-chave: Coexistence; Competition; Community structure; Resource partitioning; Niche.
Ano: 2000 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000100016
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Eusocial Apidae in tropical insular region BABT
Lorenzon,Maria Cristina Affonso; Conde,Marilena de Menezes Silva; Barbosa,Celso Guimarães.
This study examined species richness and relative abundance of eusocial Apidae in an insular region of rain-forest, southeastern Brazil. Sampling took place during one year, using an standardized method with entomological net, at sites of secondary growth habitats surrounded by Atlantic rain-forest. Thirteen species of eusocial Apidae were netted at flowers, over 80% of the captured individuals were meliponine species, although the presence of Apis mellifera, commonly dominant in Brazilian habitats. Foraging activity of these bee species were essentially non-seasonal, apparently affected by high humidity. The patterns in abundance and species richness observed in Ilha Grande differed with other studies conducted at tropical islands, which were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Tropical rain forest; Meliponine species; Bee community; Niche.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000600007
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Ontogenetic, spatial and temporal variations in the feeding ecology of Deuterodon langei Travassos, 1957 (Teleostei: Characidae) in a Neotropical stream from the Atlantic rainforest, southern Brazil Neotropical Ichthyology
Vitule,Jean R. S.; Braga,Marcelo R.; Aranha,José M. R..
Information related to the diet of one species always contributes to the knowledge of its bionomy and the functioning of the ecosystem in which the species lives. Therefore, understanding the feeding ecology of one fish population and its ontogenetic, spatial and temporal aspects help to understand the structure of fish assemblages and river communities. Knowledge of this structure is essential for habitat management and biodiversity conservation. The feeding ecology of Deuterodon langei Travassos, 1957 was studied through analyses of diet composition, sharing of resources, feeding strategy and contribution of food items to the width of its niche. The analysis included an assessment of ontogenetic, spatial and seasonal variations. The species was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Diet; Characins; Ontogeny; Niche; Atlantic Forest.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000200008
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Diet of two sympatric insectivores bats (Chiroptera: Vespertilionidae) in the Cerrado of Central Brazil Zoologia
Aguiar,Ludmilla M. S.; Antonini,Yasmine.
We examined food habits of Vespertilionidae bats Myotis nigricans (Schinz, 1821) and Eptesicus furinalis (d'Orbigny, 1847) by fecal analysis in cerrado sensu stricto and gallery forests, within APA - Gama-Cabeça-de-Veado, Brasília, Distrito Federal, Brazil. Out of 20 fecal samples collected, seven were of Eptesicus furinalis and 13 of Myotis nigricans. The diet of E. furinalis included six orders of insects: Coleoptera (5/7 by items presence), Lepidoptera and Hymenoptera (3/7), Diptera, Hemiptera and Homoptera (1/7). The diet of M. nigricans included all the main orders consumed by E. furinalis (6/13, 4/13, 4/13, 3/13, 1/13, and 4/13 respectively) and one other order: Orthoptera (1/13). Homoptera, Diptera and Orthoptera were collected only in bats captured...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biological pest control; Insectivory; Mammals; Niche.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752008000100005
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How Useful Are Species Distribution Models for Managing Biodiversity under Future Climates? Ecology and Society
Sinclair, Steve J; Arthur Rylah Institute, Department of Sustainability and Environment; steve.sinclair@dse.vic.gov.au; White, Matthew D; Arthur Rylah Institute, Department of Sustainability and Environment; Matt.White@dse.vic.gov.au; Newell, Graeme R; Arthur Rylah Institute, Department of Sustainability and Environment; Graeme.Newell@dse.vic.gov.au.
Climate change presents unprecedented challenges for biological conservation. Agencies are increasingly looking to modeled projections of species’ distributions under future climates to inform management strategies. As government scientists with a responsibility to communicate the best available science to our policy colleagues, we question whether current modeling approaches and outputs are practically useful. Here, we synthesize conceptual problems with species distribution models (SDMs) associated with interspecific interactions, dispersal, ecological equilibria and time lags, evolution, and the sampling of niche space. Although projected SDMs have undoubtedly been critical in alerting us to the magnitude of climate change impacts, we conclude...
Tipo: Peer-Reviewed Synthesis Palavras-chave: Climate policy; Climatic envelope; Decision support; Distribution modeling; Niche; Spatial modeling; Species interaction..
Ano: 2010
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Habitat selection and maturation of Saccocoelioides nanii (Digenea: Haploporidae) in Prochilodus argenteus (Actinopterygii: Prochilodontidae) from the São Francisco River, Brazil Rev. Bras. Zool.
Monteiro,Cassandra M.; Brasil-Sato,Marilia C..
This work examined the possible preference of Saccocoelioides nanii Szidat, 1954 for the three major intestinal portions of Prochilodus argenteus Agassiz, 1829 and statistically evaluated whether the river water level dynamic interfered in the parasite's ecological parameters and in its transmission to the definitive host. One-hundred-fifty specimens of P. argenteus were collected in July, 2003 (dry season) and in January, 2004 (rainy season) in the upper São Francisco River, State of Minas Gerais, Brazil. Of the 150 hosts, 96 (64%) were parasitized by S. nanii. The mean intensity and abundance were 32.6 ± 34.8 and 20.8 ± 31.9, respectively, and the range of infection intensity was from 1 to 177. The abundance of S. nanii was higher in the middle intestine...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Niche; Parasite ecology; São Francisco Basin.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000500013
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Diversity and associations between coastal habitats and anurans in southernmost Brazil Anais da ABC (AABC)
OLIVEIRA,MAURO C.L.M.; SANTOS,MAURICIO B. DOS; LOEBMANN,DANIEL; HARTMAN,ALEXANDRE; TOZETTI,ALEXANDRO M..
This study aimed to verify the relationship between habitat and the composition of anuran species in dune and restinga habitats in southernmost Brazil. The habitats were sampled between April 2009 and March 2010 using pitfalls with drift fence. We have captured 13,508 individuals of 12 anuran species. Species richness was lower in the dunes and dominance was higher in the resting. Apparently the less complex plant cover, water availability, and wide daily thermal variation in dunes act as an environmental filter for frogs. This hypothesis is reinforced by the fact that the most abundant species (Physalaemus biligonigerus and Odonthoprynus maisuma) bury themselves in the sand, minimizing these environmental stresses. Despite being in the Pampa biome, the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Amphibia; Coastal dunes; Restinga; Niche.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200575
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Implications of morphological and functional traits for trophic relationships within fish communities and marine trophic network architecture ArchiMer
Cachera, Marie.
A current issue in ecology is to understand the contribution of biodiversity to ecosystem functioning and notably to comprehend how inter- and intra-specific trait variation affects trophic interactions between individuals and species, the trophic organization of communities and trophic network architecture. Particularly, morphology has historically been considered as a main determinant of organisms’ ecology, which led to the field of ecomorphology, and, from a functional perspective, is expected to influence trophic relationships and other ecological functions performed by species. This thesis aimed at studying the trophic organization of a marine fish community and its dependency on morphological and functional trait variation between and within species....
Tipo: Text Palavras-chave: Communauté; Morphologie; Réseau trophique; Niche; Traits fonctionnels; Manche Est; Community; Morphology; Trophic network; Niche; Functional traits; Eastern English Channel.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00195/30603/29069.pdf
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Feeding ecology of stream-dwelling Characidae (Osteichthyes: Characiformes) from the upper Tocantins River, Brazil Rev. Bras. Zool.
Moraes,Maíra; Rezende,Carla Ferreira; Mazzoni,Rosana.
In this contribution we studied the trophic ecology of four Characidae species from the Cavalo Stream, upper Tocantins River, considering diet overlap and trophic niche breadth. The diet of the four species was composed of adult and immature insects, both autochthonous and allochthonous in origin. Autochthonous items dominated the diet of Moenkhausia dichroura (Kner, 1858), Bryconamericus sp., and Creagrutus atrisignum Myers, 1917. By contrast, allochthonous items were dominant in the diet of Astyanax bimaculatus (Linnaeus, 1758). Trophic niche breadth varied among species, with the highest value recorded for M. dichroura (0.48), followed by Bryconamericus sp. (0.39), A. bimaculatus (0.33) and C. atrisignum (0.29). Similarity analysis revealed two groups...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Allochthonous; Autochthonous; Niche; Resource; Stream.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702013000600009
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Feeding ecology of Erythrolamprus jaegeri jaegeri (Günter, 1858) and Erythrolamprus poecilogyrus sublineatus (Cope, 1860) in the coastal zone of Subtropical Brazil (Serpentes, Dipsadidae) Anais da ABC (AABC)
CORRÊA,DANIELE N.; QUINTELA,FERNANDO M.; LOEBMANN,DANIEL.
ABSTRACT The snakes Erythrolamprus jaegeri jaegeri and Erythrolamprus poecilogyrus sublineatus are sympatric and syntopic in the coastal region of southern Brazil. Herein, we analyzed the diet composition to evaluate the niche breadth and the prey selection by both species. We examined 192 specimens, and analysis of stomach contents revealed that both species predominantly consume anurans. However, the diet of E. j. jaegeri consists mainly of fish and amphibians, whereas that of E. p. sublineatus is broader, including fish, amphibians, reptiles and mammals. The Standardized Levins Index presented lower values for E. j. jaegeri (BA = 0.17) than for E. p. sublineatus (BA = 0.61), evidencing specialist and generalist strategies for each species, respectively....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Diet; Ophidians; Prey; Size; Niche.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100293
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Picturing thermal niches and biomass of hydrothermal vent species ArchiMer
Husson, Berengere; Sarradin, Pierre-marie; Zeppilli, Daniela; Sarrazin, Jozee.
In community ecology, niche analysis is a classic tool for investigating species’ distribution and dynamics. Components of a species’ niche include biotic and abiotic factors. In the hydrothermal vent ecosystem, although composition and temporal variation have been investigated since these deep-sea habitats were discovered nearly 40 years ago, the roles and the factors behind the success of the dominant species of these ecosystems have yet to be fully elucidated. In the Lucky Strike vent field on the Mid Atlantic Ridge (MAR), the dominant species is the mussel Bathymodiolus azoricus. Data on this species and its associated community were collected during four oceanographic cruises on the Eiffel Tower edifice and integrated in a novel statistical framework...
Tipo: Text Palavras-chave: Bathymodiolus azoricus; OMI; Habitat; Niche; Mid-Atlantic ridge; Lucky strike.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00341/45254/44692.pdf
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Local environmental controls of Atlantic Forest tree community assembly on a coastal continental island in southeastern Brazil Acta Botanica
Nettesheim,Felipe Cito; Garbin,Mário Luís; Pereira,Marcos Gervasio; Araujo,Dorothy Sue Dunn de.
ABSTRACT Tropical forests with high species diversity are commonly found in rugged montane areas. We investigated causes of local tropical forest tree community assembly on a continental island with heterogeneous terrain. We recorded tree community (absolute species abundance), topography, soil, litter and location in 40 sampling units on two opposite sides of the island with similar heterogeneous terrain. We used transformation based Redundancy Analyses and variation partitioning to determine the contribution of environment (topography, soil and litter), spatial structure (geographic location and Moran Eigenvector Maps) and the shared effects of these to explain community assembly. The environment made a significant contribution to explain tree community...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Community composition; Community structure; Floristics; Neutral; Niche; Soil; Spatial structure; Topography; Tropical forest.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000100088
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Testing methods in species distribution modelling using virtual species: what have we learnt and what are we missing? ArchiMer
Meynard, Christine N.; Leroy, Boris; Kaplan, David.
Species distribution models (SDMs) have become one of the major predictive tools in ecology. However, multiple methodological choices are required during the modelling process, some of which may have a large impact on forecasting results. In this context, virtual species, i.e., the use of simulations involving a fictitious species for which we have perfect knowledge of its occurrence‐environment relationships and other relevant characteristics, have become increasingly popular to test SDMs. This approach provides for a simple virtual ecologist framework under which to test model properties, as well as the effects of the different methodological choices, and allows teasing out the effects of targeted factors with great certainty. This simplification is...
Tipo: Text Palavras-chave: Artificial species; Environmental niche models; Niche; Simulations; Species distribution modelling; Virtual ecologist.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00501/61308/64864.pdf
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The flower flies and the unknown diversity of Drosophilidae (Diptera): a biodiversity inventory in the Brazilian fauna Pap. Avulsos de Zool. (São Paulo)
Schmitz,Hermes José; Valente,Vera Lúcia da Silva.
Abstract Diptera is a megadiverse order, reaching its peak of diversity in Neotropics, although our knowledge of dipteran fauna from this region is grossly lacking. This applies even to the most studied families, such as Drosophilidae. Despite its prominence, most aspects of the biology of these insects are still poorly understood, especially those linked to natural communities. Field studies on drosophilids are highly biased towards fruit-breeding species. Flower-breeding drosophilids, however, are worldwide distributed, especially in tropical regions, although being mostly neglected. The present paper shows the results of a biodiversity inventory of flower-breeding drosophilids carried out in several localities in Brazil, based on samples of 125 plant...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Drosophila; Flower-breeding drosophilids; Flower visitors; Host plants; Niche.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492019000100245
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