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Registros recuperados: 26
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Benthic macroinvertebrates as bioindicators of water quality in an Atlantic forest fragment Iheringia, Sér. Zool.
Oliveira,Augusto; Callisto,Marcos.
The objective of this study was to evaluate benthic macroinvertebrate communities as bioindicators of water quality in five streams located in the "Reserva Particular do Patrimônio Natural" (RPPN) Mata Samuel de Paula and its surroundings, in the municipality of Nova Lima near the city of Belo Horizonte, Minas Gerais State, southeastern Brazil. This region has been strongly modified by human activities including mining and urbanization. Samples were collected in the field every three months between August 2004 and November 2005, totaling six samplings in the rainy and dry seasons. This assessment identified one area ecologically altered while the other sampling sites were found to be minimally disturbed systems, with well-preserved ecological conditions....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Benthic inventory; Biodiversity; Seasonal distribution; Protected areas; Functional feeding groups.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212010000400003
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Biomass distribution and physiological capabilities of bacteria in the water column above a sea grass system. ArchiMer
Velimirov, B; Herndl, G; Kavka, G.
The distribution pattern of bacteria in the water column above and within a Posidonia oceanica bed near Ischia (off the Gulf of Naples) was investigated and correlated with DOC and POM data for autumn and winter. Data from samples of 5 stations along a transect from shallow to deep showed rather low bacterial densities (10 super(4).ml super(-1)) for both seasons. The number of attached bacteria was higher in late winter as compared to autumn when the leaves are shed from the stands. Except for occasional peaks DOC ranged between 1.5 and 4.5 mg C/1 while POM concentrations ranged form 4 to 14 mg AFDW.1 super(-1). Hydrolytic capabilities of isolated bacterial colonies showed that more carbohydrate substrates could be fermented in winter as compared to...
Tipo: Text Palavras-chave: Posidonia oceanica; Microorganisms; Physiology; Seasonal distribution; Algae; Bacteria; Particulate organic matter; Metabolism; Water column; Fermentation; Sea grass.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/acte-954.pdf
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Climatología de los frentes de marea en la Plataforma Continental y su rol en los flujos mar-atmósfera de CO2 OceanDocs
Bianucci, L..
En este trabajo se caracterizaron los frentes de marea en la Plataforma Continental Argentina al sur de 40°S y los flujos de CO2 entre el mar y la atmósfera en la región, analizándose su relación con dichos frentes. Los frentes de marea separan aguas costeras cuasi-homogéneas de aguas estratificadas de la plataforma media. La zona costera se homogeneiza por la mezcla vertical producida por fricción de las energéticas corrientes de marea que se dan en la región. La plataforma media se encuentra estratificada en verano debido al calentamiento superficial del mar, presentando una termoclina estacional bien desarrollada. La mezcla vertical a cada lado de los frentes y los movimientos verticales en la zona frontal afectan a la producción primaria y a los flujos...
Tipo: Theses and Dissertations Palavras-chave: Fronts; Atmospheric fronts; Continental shelves; Air-sea interaction; Climatology; Tidal flow; Seasonal distribution; Climatology; Continental shelves.
Ano: 2004 URL: http://hdl.handle.net/1834/3856
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Contribution à l'analyse d’intensité de l'upwelling près du Cap Blanc (Mauritanie) à partir des températures d'eau de la station « standard » Bayadère OceanDocs
Loktionov, Y..
Cet article décrit les résultats d’une analyse du niveau de corrélation entre les températures d’eau près de la bouée Bayadère (20°40’N – 17°04’W) et l’intensité de l’upwelling dans le secteur du Cap Blanc. La relation entre les températures d’eau et l’activité du vent (Indice d’upwelling) a été étudiée en intégrant la variabilité saisonnière des conditions thermiques dans cette région. Une modification de cette relation en fonction des saisons hydrologiques a été mise en évidence.
Tipo: Journal Contribution Palavras-chave: Seasonal distribution; Seasonal variations; Surface currents; Surface temperature; Temperature; Upwelling; Temperature; Http://aims.fao.org/aos/agrovoc/c_7657.
Ano: 1989 URL: http://hdl.handle.net/1834/1143
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Description de l'activité des flottilles pélagiques industrielles en 1987 dans la ZEE mauritanienne. OceanDocs
Chavance, P..
En 1987, 59 chalutiers pélagiques (62-102 m, 2000 – 3880 cv) ont opéré dans la ZEE mauritanienne. Trois pays sont représentés : l’URSS, la Roumanie et l’Allemagne de l’Est. Les captures totales atteignent 441473 tonnes dont 66,5% est pêchée par les soviétiques, 26,3% par les roumains et 7,2% par les allemands de l’Est. Les chinchards (<Trachirus sp et Decapterus rhonchus>) prédominent dans les captures avec 50,8%, les sardinelles en représentent 14,9% et la sardine 7,7%. L’activité des flottilles est apparue, comme en 1986, très marquée par les saisons hydrologiques.
Tipo: Journal Contribution Palavras-chave: Chalutiers pélagiques; Flottilles industrielles; Captures; Saisons hydrologiques; Commercial fishing; Environmental impact; Fishing effort; Fishing fleet; Pelagic fisheries; Seasonal distribution; Seasonal variations; Temperature effects; Temporal variations; Trawling; Upwelling; Environmental impact; Trawling; Fishing effort; Pelagic fisheries.
Ano: 1988 URL: http://hdl.handle.net/1834/1147
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Distribución, áreas de concentración y estructura de la población del abadejo (Genypterus blacodes) OceanDocs
Renzi, M.A..
The "abadejo" is one of the species that has been traditionally exploited in the Argentine Sea. Although the capture was not very important, it has been increased in the last years. In this work, the structure of the concentration areas of summer, spring and winter distribution and other biological items were analyzed, basing on the data collected during cruises effected by R/V "Walther Herwing" and R/V "Shinkai Maru" in these waters during 1978/79. Winter and spring distribution patterns showed the highest concentrations located between 41º and 48º SL, specially on the slope. Summer distribution pattern showed the concentration areas located between 43º30' and 48º30' LS shifted rather to the coast when comparing to the previous one. During the winter, in...
Tipo: Theses and Dissertations Palavras-chave: Geographical distribution; Population structure; Feeding; Length-weight relationships; Stomach content; Diets; Seasonal distribution.
Ano: 1982 URL: http://hdl.handle.net/1834/5028
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Distribución batimétrica, espacial y temporal del macrozoobentos en el Canal Beagle, Tierra del Fuego, Argentina OceanDocs
Diez, M..
El Canal Beagle (Tierra del Fuego, Argentina) se encuentra en el sistema de canales fueguinos que representa el ambiente marino subantártico costero más estrechamente relacionado con la Antártida. Además, el Canal Beagle constituye una vía de intercambio de fauna y flora ente los océanos Pacífico y Atlántico. El objetivo de este trabajo fue determinar la composición, abundancia y biomasa del macrozoobentos en el Canal Beagle como también la producción secundaria de los ensambles bentónicos. Durante 1999 y 2000, en forma estacional, en tres áreas diferentes y en dos rangos de profundidad: 40m y 70m, se tomaron muestras del macrozoobentos mediante el uso de una rastra epibentónica. Los organismos se identificaron y cada taxón se contó y pesó para determinar...
Tipo: Theses and Dissertations Palavras-chave: Zoobenthos; Seasonal distribution; Abundance; Biomass; Secondary production; Marine environment; Biomass; Marine environment; Zoobenthos; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_4610; Http://aims.fao.org/aos/agrovoc/c_15487.
Ano: 2006 URL: http://hdl.handle.net/1834/3545
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Distribución de la densidad fitoplanctónica en una estación fija costera. La Libertad (Ecuador), durante 1989-1993 OceanDocs
Torres, G..
El presente trabajo pretende dar a conocer los resultados de la distribución estacional cuantitativa del fitoplancton (diatomeas y dinoflagelados), y su relación con masas de agua, dadas por temperatura y salinidad, desde 1989 hasta 1993 en una estación fija costera La Libertad, período en el cual se presentó un evento "El Niño" 1991-1992.
Tipo: Journal Contribution Palavras-chave: Phytoplankton; Seasonal distribution; Water temperature; Oceanographic stations; Fixed stations; Biomass; Population density; Biomass; Phytoplankton; Water temperature; Population density; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_16063; Http://aims.fao.org/aos/agrovoc/c_6112.
Ano: 1996 URL: http://hdl.handle.net/1834/2198
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Distribución de la micobiota marina en dos playas de Ciudad de la Habana OceanDocs
Enríquez, D.; González, M. del C.; Delgado, Y..
Actualmente existen escasos trabajos sobre la influencia de las lluvias en la distribución de los hongos presentes en los ecosistemas marinos. Este estudio tiene como objetivo conocer la distribución de los hongos marinos en los meses de junio (lluvioso) y marzo (seco) del año 2000, en dos playas ubicadas al norte de Ciudad de la Habana. Se empleó la metodología de incubación de sustratos vegetales en cámara húmeda y los hongos aislados se clasificaron hasta nivel de especie. Se obtuvieron un total de 82 aislamientos, de los cuales el 87.6 % corresponden a hongos ascomicetos y el 13.4% a hongos mitospóricos. Corollospora marítima y Lindra marinera fueron las especies más frecuentes, con 26.8% y 17%, respectivamente. En junio el número de aislamientos de...
Tipo: Journal Contribution Palavras-chave: Fungi; Seasonal distribution; Fungi; Http://aims.fao.org/aos/agrovoc/c_3145.
Ano: 2008 URL: http://hdl.handle.net/1834/3397
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Distribución estacional y ecología de las medusas (Cnidarias: Hydrozoa) en la zona costera sur de la Bahía de Santa Elena durante el período (Octubre 2004-octubre 2005) OceanDocs
Andrade Ruíz, C.E..
La presente investigación se desarrolló en el sector sur de la Bahía de Santa Elena durante octubre 2004 a octubre 2005, analizándose un total de 144 muestras zooplanctónicas e identificándose 24 especies, clasificados en 6 órdenes: 5 de la clase Hydrozoa, con 16 familias; 22 géneros y 22 especies, y 2 clases: La clase Scyphozoa y Cubozoa con 1 especie respectivamente. Se consideró las dos épocas estacionales (lluviosa y seca) registrándose para la época lluviosa el 41% de biomasa total con 6477 ind. (100m3-1), mientras que en la época seca se registró el 59% de biomasa total con 9159 ind. ((100m3-1). El análisis estadístico determinó cambios entre la estación lluviosa con una correlación positiva promedio vs la temperatura con valores de 0.75. Mientras en...
Tipo: Journal Contribution Palavras-chave: Seasonal distribution; Biomass; Dry season; Rainy season; Species diversity; Zooplankton; Hydrobiology.
Ano: 2012 URL: http://hdl.handle.net/1834/4710
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Distribución estacional y estructura poblacional del bacalao austral (Pisces, Moridae, Salilota australis) en la zona económica exclusiva argentina entre los 45°S y 56°S durante 1992 y 1993 OceanDocs
Cassia, M.C.; Hansen, J.E..
The Patagonian cod (Salilota australis) inhabits the SW Atlantic from 38°S up to 55°S, as well as the Pacific Ocean from 40°S up to 57°S. The annual catches of this species by both the Argentine fleet and those operating around the Malvinas Islands have significantly increased during the decade 1990-2000, peaking to 16,556 t in 1996. After this, a marked decrease in landings was noticed, and during 2003 the catch was 7,924 t. Seasonal distribution, concentration grounds, and population structure of the Patagonian cod from the Argentine Sea are described, and the mean densities of the species are seasonally related to latitude, temperature and depth, on the basis of data from surveys carried out by the INIDEP research vessels in 1992 and 1993. Highest mean...
Tipo: Journal Contribution Palavras-chave: Gadoid fisheries; Seasonal distribution; Population density; Population structure; Biomass; Population structure; Biomass; Population density; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_6112.
Ano: 2005 URL: http://hdl.handle.net/1834/1561
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Distribution characteristic and variation trend of planktonic dinoflagellate in the Taiwan Strait from 2006 to 2007. OceanDocs
Lin, Gengming; Yang, Qingliang; Lin, Weihan; Wang, Yu.
Based on 4 cruise surveys from July 2006 to October 2007 in the Taiwan Strait, the species composition, community structure and spatio-temporal distribution of dinoflagellate were studied. A total of 131 dinoflagellates belonging to 18 genera were identified. The population was dominated by hyperthermal and hyperhaline species accounting for 72.52% of the total species. Eurythermal and euryhaline species were the second most common one accounting for 25.19% of the total species. It was only 2.29% for neritic species. The maximum species number occurred in summer, while the maximum cell density appeared in spring. The average dinoflagellate cell density was 404.96×104 cells/m3. It showed that the dinoflagellate cell density increased from the nearshore...
Tipo: Journal Contribution Palavras-chave: Planktonic algae; Distribution; Seasonal distribution; Species diversity.
Ano: 2012 URL: http://hdl.handle.net/1834/5839
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Evaluation des stocks et aménagement des pêcheries de la ZEE mauritanienne OceanDocs
Diop, M.; Inejih, C.A.O.; Tous, P.; Failler, P.; Dia, M.A..
Le cinquième groupe de travail destiné à l’évaluation des stocks et l’aménagement des pêcheries de la zone économique exclusive mauritanienne s’est réuni à l’Institut Mauritanien de Recherches Océanographiques et des Pêches (IMROP) du 9 au 17 décembre 2002. Les objectifs de ce groupe de travail étaient d’actualiser les résultats des groupes de travail précédents, en utilisant les nouvelles informations disponibles ; d’établir un diagnostic des différents stocks et pêcheries afin de définir les potentiels de capture ainsi que les caractéristiques de l’effort permissible et d’évaluer l’impact des mesures d’aménagement actuellement en vigueur et identifier les perspectives à venir. Les résultats obtenus ont contribué à la formulation de recommandations...
Tipo: Journal Contribution Palavras-chave: Artisanal fishing; Catch composition; Catch statistics; Catch/effort; Cephalopod fisheries; Coastal fisheries; Demersal fisheries; Economic analysis; Environmental conditions; Fishery economics; Fishery management; Fishing effort; Fishing fleet; Landing statistics; Marine environment; Overfishing; Pelagic fisheries; Population dynamics; Prices; Quality assurance; Quality control; Research institutions; Research vessels; Seasonal distribution; Seasonal variations; Shrimp fisheries; Socioeconomic aspects; Upwelling; Demersal fisheries; Economic analysis; Fishery management; Marine environment; Prices; Research vessels; Catch composition; Coastal fisheries; Environmental conditions; Fishing effort; Overfishing; Pelagic fisheries; Population dynamics; Quality assurance; Research institutions; Http://aims.fao.org/aos/agrovoc/c_2173; Http://aims.fao.org/aos/agrovoc/c_2469; Http://aims.fao.org/aos/agrovoc/c_24026; Http://aims.fao.org/aos/agrovoc/c_4610; Http://aims.fao.org/aos/agrovoc/c_6178; Http://aims.fao.org/aos/agrovoc/c_6516; Http://aims.fao.org/aos/agrovoc/c_1384; Http://aims.fao.org/aos/agrovoc/c_1696; Http://aims.fao.org/aos/agrovoc/c_32980; Http://aims.fao.org/aos/agrovoc/c_24027; Http://aims.fao.org/aos/agrovoc/c_34068; Http://aims.fao.org/aos/agrovoc/c_5659; Http://aims.fao.org/aos/agrovoc/c_6111; Http://aims.fao.org/aos/agrovoc/c_35287; Http://aims.fao.org/aos/agrovoc/c_6514.
Ano: 2005 URL: http://hdl.handle.net/1834/1322
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Factores oceanográficos relacionados con la abundancia relativa de anchoíta (Engraulis anchoita) sobre la plataforma bonaerense (34°S-41°S) durante la primavera OceanDocs
Martos, P.; Hansen, J.E.; Negri, R.M.; Madirolas, A..
Research has been conducted to study the relationship between some physical variables and the relative abundance of the northern stock of the Argentine anchovy (Engraulis anchoita) within the main area of distribution of the stock during springtime. Basic data were recorded during four research surveys mainly aimed at the acoustic assessment of the stock between 34°S and 41° 30'S (Buenos Aires prov., Argentina - Uruguay). The cruises were always carried out in October from 1993 to 1996. Several environmental variables were simultaneously input into a General Linear Model to analyze the variations on fish abundance; however, the model did not account for more than 17-20% of the total variance. Nevertheless most of those factors (sea surface temperature,...
Tipo: Journal Contribution Palavras-chave: Clupeoid fisheries; Seasonal distribution; Abundance; Stocks; Fronts; Salinity gradients; Stocks; Http://aims.fao.org/aos/agrovoc/c_28772.
Ano: 2005 URL: http://hdl.handle.net/1834/1559
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Ichthyoplankton composition, distribution and abundance on the southern patagonian shelf and adjacent waters. OceanDocs
Ehrlich, M.D.; Sánchez, R.P.; de Ciechomski, J.D.; Machinandiarena, L.; Pájaro, M..
This paper reviews the information on pelagic and demersal fish eggs and larvae, describing the distribution and seasonality of different species and their arrangement in icthyoplankton assemblages in the Southern patagonian waters. It also reports on 11 surveys conducted by INIDEP during 1992-1995. A total of 488 ichthyoplankton samples were analyzed. Fish eggs have been recognized in 47. of all ichthyoplankton samples. They belong to three species: Coelorhynchus fasciatus, Macrourus whitsoni and Micromesistius australis. Fish larvae of 23 species and 17 families have been identified in 96. of all samples analyzed. Spawning of most species begins in autumn, and progresses through winter, when the southern blue whiting and grenadier fish contribute to...
Tipo: Journal Contribution Palavras-chave: Ichthyoplankton; Fish larvae; Fish eggs; Seasonal distribution; Abundance; Fish larvae; Http://aims.fao.org/aos/agrovoc/c_2924.
Ano: 1999 URL: http://hdl.handle.net/1834/2574
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Importance des saisons de transition hydrologique et impact des anomalies climatiques sur l'activité d’une flottille pélagique en ZEE mauritanienne 1985 – 1987 OceanDocs
Chavance, P.; Loktionov, Y.; Mahfoudh, M..
Tipo: Journal Contribution Palavras-chave: Catch/effort; Condition factor; Environmental effects; Environmental impact; Fishery resources; Fishing fleet; Pelagic fisheries; Seasonal distribution; Seasonal variations; Temperature effects; Temporal variations; Upwelling; Environmental impact; Fishery resources; Pelagic fisheries; Http://aims.fao.org/aos/agrovoc/c_24420; Http://aims.fao.org/aos/agrovoc/c_2942; Http://aims.fao.org/aos/agrovoc/c_5659.
Ano: 1989 URL: http://hdl.handle.net/1834/1144
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Los recursos pesqueros demersales del Mar Argentino. Parte I. Evaluación de la biomasa (Standing stock)de la merluza común (Merluccius hubbsi)y de la merluza austral (Merluccius polylepis)en el área de su distribución estival OceanDocs
Simonazzi, M.A.; Otero, H.O..
The present paper deals with the standing stock (Pw1)of the common hake (Merluccius hubbsi)and the austral hake (Merluccius polylepis), using the swept are method (Alverson, 1971)and with the Potential Yield (Cmax)using the Gulland (1970)method. The standing stock of the common hake was 2.642.715 tons. the highest concentrations of this specie were distributed over 12.348 nm² (13 o/o of the toal distribution area)with 1.178.843 tons. This area was located between 41° and 45° of south latitude and between the coast and 100 m of bottom depth in the Patagonian Shelf. The other 1.463.872 tons were distributed over a wide area of 82.727 nm².
Tipo: Journal Contribution Palavras-chave: Stock assessment; Geographical distribution; Seasonal distribution; Hake fisheries; Stock assessment; Geographical distribution; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_5083.
Ano: 1980 URL: http://hdl.handle.net/1834/2057
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Population biology and distribution of the portunid crab Callinectes ornatus (Decapoda: Brachyura) in an estuary-bay complex of southern Brazil Rev. Bras. Zool.
Watanabe,Timoteo T.; Sant'Anna,Bruno S.; Hattori,Gustavo Y.; Zara,Fernando J..
Trawl fisheries are associated with catches of swimming crabs, which are an important economic resource for commercial as well for small-scale fisheries. This study evaluated the population biology and distribution of the swimming crab Callinectes ornatus (Ordway, 1863) in the Estuary-Bay of São Vicente, state of São Paulo, Brazil. Crabs were collected from a shrimp fishing boat equipped with a semi-balloon otter-trawl net, on eight transects (four in the estuary and four in the bay) from March 2007 through February 2008. Specimens caught were identified, sexed and measured. Samples of bottom water were collected and the temperature and salinity measured. A total of 618 crabs were captured (332 males, 267 females and 19 ovigerous females), with a sex ratio...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Migration; Population biology; Seasonal distribution; Swimming crab.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702014000400004
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Reproductive dynamics of swordfish (Xiphias gladius) in the southwestern Indian Ocean (Reunion Island). Part 1: oocyte development, sexual maturity and spawning ArchiMer
Poisson, Francois; Fauvel, Christian.
The reproductive dynamics of swordfish (Xiphias gladius) was investigated from catches of the Reunion Island-based longline swordfish fishery between 19-25 degrees S and 48-54 degrees E. Thus, 1727 swordfish (size range 75-289 cm, lower jaw-to-fork length, LJFL) were sampled on board commercial fishing vessels during the period of May 1998 to January 2001. Reproductive activity was assessed using macroscopic gonad characteristics, trends of gonadal indexes for both sexes, oocyte size-frequency distributions and microscopic investigation of oocyte development stages. Size at first maturity (L-50) for female and male swordfish was estimated in Indian Ocean for the first time. L50 was estimated at 170 cm and 120 cm (LJFL) for females and males, respectively....
Tipo: Text Palavras-chave: Indian Ocean; Xiphias gladius; Swordfish; Seasonal distribution; Size at first maturity; Histology; Spawning season; Sex ratio; Reproduction.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6353.pdf
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Seasonal Climate Variation and Caribou Availability: Modeling Sequential Movement Using Satellite-Relocation Data Ecology and Society
Nicolson, Craig; Department of Natural Resources Conservation, University of Massachusetts, Amherst ; craign@eco.umass.edu; Berman, Matthew; Institute of Social and Economic Research, University of Alaska Anchorage; matthew.berman@uaa.alaska.edu; West, Colin Thor; Department of Anthropology, University of North Carolina at Chapel Hill ; ctw@email.unc.edu; Kofinas, Gary P.; Department of Humans and Environment and Institute of Arctic Biology, University of Alaska, Fairbanks ; gpkofinas@alaska.edu; Griffith, Brad; U.S. Geological Survey Alaska Cooperative Fish and Wildlife Research Unit; Institute of Arctic Biology University of Alaska Fairbanks; dbgriffith@alaska.edu; Russell, Don; CircumArtic Rangifer Monitoring and Assessment Network (CARMA); don.russell@ec.gc.ca; Dugan, Darcy; Alaska Ocean Observing System; dugan@aoos.org.
Livelihood systems that depend on mobile resources must constantly adapt to change. For people living in permanent settlements, environmental changes that affect the distribution of a migratory species may reduce the availability of a primary food source, with the potential to destabilize the regional social-ecological system. Food security for Arctic indigenous peoples harvesting barren ground caribou (Rangifer tarandus granti) depends on movement patterns of migratory herds. Quantitative assessments of physical, ecological, and social effects on caribou distribution have proven difficult because of the significant interannual variability in seasonal caribou movement patterns. We developed and evaluated a modeling approach for simulating the distribution...
Tipo: Peer-Reviewed Reports Palavras-chave: Caribou; Markovian; Migration; Rangifer tarandus granti; Seasonal distribution; Simulation; Subsistence hunting.
Ano: 2013
Registros recuperados: 26
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