Consulta: subjectFacets:"Food webs"
Registros recuperados: 27
Data/hora: 03/06/2024 16:47:25

Theories of the deep: combining salience and network analyses to produce mental model visualizations of a coastal British Columbia food web
Provedor de dados: Ecology and Society
Autores: Levine, Jordan; Institute for Resources, Environment and Sustainability, University of British Columbia; jlevine@interchange.ubc.ca; Muthukrishna, Michael; Department of Human Evolutionary Biology, Harvard University; Department of Social Psychology, London School of Economics; muthukrishna@fas.harvard.edu; Chan, Kai M. A.; Institute for Resources, Environment and Sustainability, University of British Columbia; kaichan@ires.ubc.ca; Satterfield, Terre; Institute for Resources, Environment and Sustainability, University of British Columbia; terre.satterfield@ires.ubc.ca.
Arriving at shared mental models among multiple stakeholder groups can be crucial for successful management of contested social-ecological systems (SES). Academia can help by first eliciting stakeholders&amp;#8217; initial, often tacit, beliefs about a SES, and representing them in useful ways. We demonstrate a new recombination of techniques for this purpose, focusing specifically on tacit beliefs about food webs. Our approach combines freelisting and sorting techniques, salience analysis, and ultimately network analysis, to produce accessible visualizations of aggregate mental models that can then be used to facilitate discussion or generate further hypotheses about cognitive drivers of conflict. The case study we draw upon to demonstrate this technique...
Tipo: Peer-Reviewed Reports
Palavras-chave: British Columbia; Food webs; Mental models; Network analysis; Salience analysis.
Ano: 2015

Visualizing the Food-Web Effects of Fishing for Tunas in the Pacific Ocean
Provedor de dados: Ecology and Society
Autores: Hinke, Jefferson T; Pacific Fisheries Environmental Laboratory and Joint Institute for Marine and At; jhinke@pfeg.noaa.gov; Kaplan, Isaac C; Center for Limnology, University of Wisconsin; ickaplan@wisc.edu; Aydin, Kerim; Alaska Fisheries Science Center; Kerim.Aydin@noaa.gov; Watters, George M; Pacific Fisheries Environmental Laboratory; gwatters@pfeg.noaa.gov; Olson, Robert J; Inter-American Tropical Tuna Commission; rolson@iattc.org; Kitchell, James F. K.; Center for Limnology, University of Wisconsin; kitchell@mhub.limnology.wisc.edu.
We use food-web models to develop visualizations to compare and evaluate the interactions of tuna fisheries with their supporting food webs in the eastern tropical Pacific (ETP) and the central north Pacific (CNP) Oceans. In the ETP and CNP models, individual fisheries use slightly different food webs that are defined by the assemblage of targeted tuna species. Distinct energy pathways are required to support different tuna species and, consequently, the specific fisheries that target different tuna assemblages. These simulations suggest that catches of tunas, sharks, and billfishes have lowered the biomass of the upper trophic levels in both systems, whereas increases in intermediate and lower trophic level animals have accompanied the decline of top...
Tipo: Peer-Reviewed Reports
Palavras-chave: Ecosystem modeling; Food webs; Longline fishing; Purse-seine fishing; Tunas; Trophic levels; Pacific Ocean.
Ano: 2004

Structure et dynamique temporelle des communautés hydrothermales inféodées à la dorsale Juan de Fuca : utilisation d'une approche observatoire fond de mer
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Lelièvre, Yann.
Hydrothermal vents are distributed along mid-ocean ridges and back-arc basins. These ecosystems harbour a specialized fauna supported by a local chemosynthetic microbial production, made possible through the oxidation of reduced elements present in the hydrothermal fluid. While the relationships between faunal assemblages and habitats have been relatively well described around the globe, our knowledge on the temporal dynamics of these environments is still limited, particularly at time scale relevant to organisms (from few minutes to several years). Based on hydrothermal vent communities occurring on the Juan de Fuca Ridge, located in the northeast Pacific Ocean, this thesis aims at understanding the functioning and temporal dynamics of macrofaunal...
Tipo: Text
Palavras-chave: Écologie hydrothermale; Observatoire fond de mer; Diversité; Réseaux trophiques; Dynamique temporelle; Imagerie; Temporal dynamics; Imagery; Food webs; Hydrothermal ecology; Seafloor observatory; Diversity.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00497/60907/64256.pdf

Ecosystemes benthiques profonds et chimiosynthese bacterienne: Sources hydrothermales et suintements
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Laubier, Lucien.
Hydrothermal communities of various species compositions have been described from the eastern and western Pacific and Atlantic. Brine and cold seeps and hydrocarbon seepages have been found off Florida, off the Oregon and Japanese subduction systems, on the Laurentian Fan, near Barbados, and off Louisiana. Biomasses range from 10 to 70 kg/m super(2), fresh weight. Basic microdistribution of species groups in aureoles centered around hydrothermal vents reveals different levels of adaptation to harsh physico-chemical conditions. Two groups of primary producers can be recognized: a highly efficient cool water group with large vestimentiferan tube worms and bivalves, and alvinellid polychaetes adapted to hot waters. Both groups are exploited by specific...
Tipo: Text
Palavras-chave: Bivalvia; Polychaeta; Bacteria; Symbionts; Biosynthesis; Chemosynthesis; Food webs; Biomass; Hydrocarbons; Ecosystems; Hydrothermal springs; Seepages; Brines; Benthic environment; Benthos.
Ano: 1990
URL: http://archimer.ifremer.fr/doc/1990/acte-1171.pdf

Biological availability of sediment-bound trace metals.
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Luoma, S.
It has been established that direct uptake of (at least some) trace metals from sediments contributes to metal concentrations in benthic organisms. Important controls on metal uptake from sediment are the concentration of the exposure, the partitioning of the metals among components of the sediment, and the redox potential of the sediment. Important problems in ecology, physiology, geochemistry and biogeochemistry remain unresolved, however, and a concentrated interdisciplinary research effort will be necessary before a complete understanding of the fate and impact of sediment-bound metals will be possible.
Tipo: Text
Palavras-chave: Bioaccumulation; Benthos; Food webs; Biogeochemical cycle; Sediments; Availability; Trace metals.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1302.pdf

Energy transfer in the Congo deep-sea fan: from terrestrially-derived organic matter to chemosynthetic food webs
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Pruski, A. M.; Decker, Carole; Stetten, E.; Vetion, G.; Martinez, P.; Charlier, K.; Senyarich, C.; Olu, Karine.
Large amounts of recent terrestrial organic matter (OM) from the African continent are delivered to the abyssal plain by turbidity currents and accumulate in the Congo deep-sea fan. In the recent lobe complex, large clusters of vesicomyid bivalves are found all along the active channel in areas of reduced sediment. These soft-sediment communities resemble those fuelled by chemoautotrophy in cold-seep settings. The aim of this study was to elucidate feeding strategies in these macrofaunal assemblages as part of a greater effort to understand the link between the inputs of terrestrially-derived OM and the chemosynthetic habitats. The biochemical composition of the sedimentary OM was first analysed in order to evaluate how nutritious the available particulate...
Tipo: Text
Palavras-chave: Congo deep-sea fan; Food webs; Vesicomyid bivalves; Chemoautotrophy; Isotopic signatures; Fatty acid biomarkers.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00385/49686/50216.pdf

Food-web complexity across hydrothermal vents on the Azores triple junction
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Portail, Marie; Brandily, Christophe; Cathalot, Cecile; Colaco, Ana; Gelinas, Yves; Husson, Berengere; Sarradin, Pierre-marie; Sarrazin, Jozee.
The assessment and comparison of food webs across various hydrothermal vent sites can enhance our understanding of ecological processes involved in the structure and function of biodiversity. The Menez Gwen, Lucky Strike and Rainbow vent fields are located on the Azores triple junction of the Mid-Atlantic Ridge. These fields have distinct depths (from 850 to 2320 m) and geological contexts (basaltic and ultramafic), but share similar faunal assemblages defined by the presence of foundation species that include Bathymodiolus azoricus, alvinocarid shrimp and gastropods. We compared the food webs of 13 faunal assemblages at these three sites using carbon and nitrogen stable isotope analyses (SIA). Results showed that photosynthesis-derived organic matter is a...
Tipo: Text
Palavras-chave: Mid-Atlantic Ridge; Hydrothermal vents; Food webs; Stable isotopes; Functional traits.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00414/52551/53732.pdf

Integrating taxon-based, trait-based and trophic-network approaches to study community dynamics in an exploited ecosystem, the Celtic Sea
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Merillet, Laurene.
Marine ecosystems face many pressures, the main ones being fishing and climate change. These pressures do not have the same consequences on the different facets of biodiversity, e.g. on taxa, traits and networks, and their study is necessary for the implementation of an ecosystem approach to fisheries. The Celtic Sea is a very important fishing area for European fisheries, with a specific richness greater than adjacent areas. Based on a time series from 2000 to 2016, I have studied the spatio-temporal dynamics of 101 species of the ecosystem. Over this period, taxonomic biodiversity was stable, and the importance of fishing as a structuring variable for communities decreased after 2009, and was lower than the environment (depth, chlorophyll a concentration...
Tipo: Text
Palavras-chave: Approche écosystémique des pêches; Dynamiques spatio-temporelles; Traits d’histoire de vie; Réseaux trophiques; Gestion des ressources; Ecosystem approach to fisheries; Spatio-temporal dynamics; Community ecology; Life-history traits; Food webs; Resource management.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00666/77806/79980.pdf

Fishing restrictions and remoteness deliver conservation outcomes for Indonesia's coral reef fisheries
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Campbell, Stuart J.; Darling, Emily S.; Pardede, Shinta; Ahmadia, Gabby; Mangubhai, Sangeeta; Amkieltiela,; Estradivari,; Maire, Eva.
Coral reef fisheries depend on reef fish biomass to support ecosystem functioning and sustainable fisheries. Here, we evaluated coral reefs across 4,000 km of the Indonesian archipelago to reveal a large gradient of biomass, from &lt;100 kg/ha to &gt;17,000 kg/ha. Trophic pyramids characterized by planktivore dominance emerged at high biomass, suggesting the importance of pelagic pathways for reef productivity. Total biomass and the biomass of most trophic groups were higher within gear restricted and no‐take management, but the greatest biomass was found on unmanaged remote reefs. Within marine protected areas (MPAs), 41.6% and 43.6% of gear restricted and no‐take zones, respectively, met a global biomass target of 500 kg/ha, compared with 71.8% of remote...
Tipo: Text
Palavras-chave: Data‐poor fisheries; Food webs; Gear restrictions; Marine protected areas; Small‐scale fisheries; South East Asia.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00607/71947/70645.pdf

Holocene variation in the Antarctic coastal food web: linking δD and δC13 in snow petrel diet and marine sediments
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Ainley, Dg; Hobson, Ka; Crosta, X; Rau, Gh; Wassenaar, Li; Augustinus, Pc.
Here we present first time evidence for concordant variation in the isotopic signature at both the base and the upper levels of the Antarctic coastal food web during the Holocene. Laminae in sub-fossil deposits of snow petrel Pagodroina nivea stomach oil, known as mumiyo, were collected from nest-sites in the Bunger Hills, East Antarctica. Mumiyo layers were sub-sampled, radiocarbondated, and analyzed for delta C-13 and delta D. The obtained values were compared to isotopic variability among layers of an ocean sediment core collected, and similarly dated, in nearby Dumont D'Urville Trough. Overlapping records extended from about 10 160 to 526 calendar years before present (cal yr BP). Mumiyo delta D values remained relatively constant throughout the...
Tipo: Text
Palavras-chave: Antarctica; Holocene climate change; Food webs; Isotopic analysis; Mumiyo; Pagodroma nivea; Sediment cores; Snow petrel.
Ano: 2006
URL: https://archimer.ifremer.fr/doc/00496/60808/64708.pdf

Are spatial variations in the diets of hydrothermal fauna linked to local environmental conditions?
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: De Busserolles, F.; Sarrazin, Jozee; Gauthier, Olivier; Gelinas, Y.; Fabri, Marie-claire; Sarradin, Pierre-marie; Desbruyeres, Daniel.
Trophic relationships in Bathymodiolus azoricus mussel bed communities on the Tour Eiffel hydrothermal edifice (Lucky Strike) were assessed using delta C-13 and delta N-15 signatures from 14 hydrothermal species. The nutritional basis of B. azoricus was also investigated with delta S-34. Faunal samples and environmental data (temperature, pH, total dissolved sulfide, iron and copper concentrations) were collected from 12 different locations on the edifice. Chemical conditions varied between microhabitats, and were all correlated to temperature. Carbon and nitrogen isotopic results revealed the presence of two, apparently independent, trophic groups. The first was composed of symbiont-bearing fauna (B. azoricus and their associated polychaetes...
Tipo: Text
Palavras-chave: Lucky Strike (37 degrees 17.29 ' N 32 degrees 16.45 ' W); Mid Atlantic Ridge; Food webs; Hydrothermal springs; Environmental conditions; Stable isotopes.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-7312.pdf

Comportement chimique et geochimique des elements a l'état de traces dans l'estuaire de la Seine: Synthese des discussions
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Guegueniat, P.
In the synthesis of discussions about the chemistry of the Seine Bay, the author after a note on natural references for metal concentrations, speaks about fluorides, nutrients, PCB, and metallic elements. In conclusion some suggestions about pollutants transfer towards ecosystems link, are enumerated.
Tipo: Text
Palavras-chave: PCB; Fluorides; Chemical pollution; Trace metals; Food webs; Bioaccumulation; Biogeochemical cycle; Trace elements.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1303.pdf

Food web structure of a Mediterranean coralligeneous ecosystem
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Belloni, Bruno; Sartoretto, Stephane; Cresson, Pierre; Bouchoucha, Marc; Guillou, Gael; Lebreton, Benoit; Ruitton, Sandrine; Harmelin-vivien, Mireille.
The coralligenous ecosystem is one of the biodiversity hotspots in the Mediterranean Sea. This study aims at determining (i) the organic matter (OM) sources at the base of the food web in a coralligenous  ecosystem  near  Marseille  (Cap  Caveau,  Frioul  Island)  and  (ii)  the  global functional structure of its community. For that purpose, C and N stable isotope analyses were performed on 78 compartments or species collected in this habitat between 30 and 40 m depth. Results  suggested  that  the  pelagic  particulate  organic  matter  (POM),  mainly  composed  of phytoplankton, was the main OM source fuelling coralligenous food webs, followed by sedimented organic matter (SOM) and some macrophytes. At least three level of consumers were identified from...
Tipo: Text
Palavras-chave: Food webs; Coralligenous ecosystem; Stable isotopes; Carbon; Nitrogen.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00483/59511/62396.pdf

Chitin/toxicant interactions and microbial degradation within estuarine ecosystems.
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Portier, R; Meyers, S.
The environmental effect and fate of several agricultural and industrial source toxicants were evaluated in controlled laboratory microcosm systems in the presence of the aminopolysaccharide polymer, chitin. Toxicants examined included methyl parathion, phenol, pentachlorophenol, 2,4 dichlorophenol, 1,2 dichloroethane and Kepone. Microcosm operating parameters, including pH/Eh, salinity, temperature, flow rate and sediment/water interface conditions, were based on comparable in situ measurements. Fate analysis predictions were based on mineralization of the parent toxicant compound as measured by chromatographic analysis or super(14)CO sub(2) expiration. Chitin, amended to continuous flow microcosms, promoted either cometabolic or cooxidative...
Tipo: Text
Palavras-chave: Controlled conditions; Chemical pollutants; Industrial wastes; Pesticides; Metabolism; Food webs; Biodegradation; Ecosystems; Microorganisms; Environmental effects; Brackishwater pollution; Estuaries; Toxicants; Chitin.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-1011.pdf

Trophic resources and mercury exposure of two silvertip shark populations in the northeast Pacific Ocean
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Le Croizier, Gaël; Lorrain, Anne; Schaal, Gauthier; Ketchum, James; Hoyos-padilla, Mauricio; Besnard, Lucien; Munaron, Jean-marie; Le Loch, Francois; Point, David.
Worldwide shark populations have experienced rapid declines over the last decades, mainly due to overfishing. Marine protected areas (MPAs) have thus become an indispensable tool for the protection of these marine predators. Two recently-created MPAs in the Northeast Pacific Ocean, the Revillagigedo National Park and Clipperton atoll, are characterized by different trophic structures potentially influencing trophic niche and contaminant exposure for resident sharks in these two sites. In this context, we used carbon (δ13C) and nitrogen (δ15N) stable isotope analyzes as well as total mercury concentrations ([THg]) to assess the role of foraging site on the trophic niche and Hg levels of juvenile ST sharks Carcharhinus albimarginatus. Analyzing fin clip...
Tipo: Text
Palavras-chave: Top-predators; Mercury transfer; Food webs; Foraging habitat; Stable isotopes; MPAs.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00619/73114/72257.pdf

Trophic level-based indicators to track fishing impacts across marine ecosystems
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Shannon, Lynne; Coll, Marta; Bundy, Alida; Gascuel, Didier; Heymans, Johanna J;; Kleisner, Kristin; Lynam, Christopher; Piroddi, Chiara; Tam, Jorge; Travers-trolet, Morgane; Shin, Yunne.
Trophic level (TL)-based indicators have been widely used to examine fishing impacts in aquatic ecosystems and the induced biodiversity changes. However, much debate has ensued regarding discrepancies and challenges arising from the use of landings data from commercial fisheries to calculate TL indicators. Subsequent studies have started to examine survey-based and model-based indicators. In this paper, we undertake an extensive evaluation of a variety of TL indicators across 9 well-studied marine ecosystems by making use of model- as well as surveyand catch-based TL indicators. Using detailed regional information and data on fishing history, fishing intensity, and environmental conditions, we evaluate how well TL indicators are capturing fishing effects...
Tipo: Text
Palavras-chave: Trophic level; Global comparison; Indicator; Survey; Catch; Ecosystem model; Trophic spectra; Convention on Biological Diversity; Food webs; Ecosystem approach to fisheries.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00222/33361/31768.pdf

Primary production and depth drive different trophic structure and functioning of fish assemblages in French marine ecosystems
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Cresson, Pierre; Chouvelon, Tiphaine; Bustamante, Paco; Bănaru, Daniela; Baudrier, Jerome; Le Loch, Francois; Mauffret, Aourell; Mialet, Benoit; Spitz, Jérome; Wessel, Nathalie; Briand, Marine; Denamiel, Margaux; Doray, Mathieu; Guillou, Gaël; Jadaud, Angelique; Lazard, Coline; Noûs, Camille; Prieur, Solène; Rouquette, Manuel; Saraux, Claire; Serre, Sandrine; Timmerman, Charles-andre; Verin, Yves; Harmelin-vivien, Mireille.
Investigating the drivers of fish assemblage trophic structure is a critical question, in order to better understand ecosystem functioning, predict the effects of perturbations and implement integrated management of exploited marine ecosystems. Ecosystemic surveys enabled the determination of the trophic structure of the fish assemblages in three French marine ecosystems, namely the Eastern English Channel, the Bay of Biscay and the Gulf of Lions, through the simultaneous collection of qualitative (stable isotopes and energy content) and quantitative (biomass) data. In the Bay of Biscay and in the Gulf of Lions, pelagic primary production supported at least 80% of the fish biomass production, and explained the dominance of pelagic species, but with...
Tipo: Text
Palavras-chave: Fish community; Trophodynamics; Food webs; Benthic-pelagic coupling.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00629/74120/73562.pdf

Contamination des crustacés décapodes par les composes organohalogénés : étude détaille de la bioaccumulation des PCB chez l'araignée de mer Maja brachydactyla
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bodin, Nathalie.
Marine decapod crustaceans are macrobenthic opportunist species, of great commercial interest, and can accumulate pollutants. Worrying about consumers' safety, polychlorobiphenyls (PCBs), polybromodiphenyl Ethers (PBDEs) and dioxins (PCDD/Fs) were analyzed in four crustacean species from the coastal waters of Brittany and Normandy. As regards to regulations, the consumption of crustacean muscle doesn't raise any health problems. The second objective of this study was to evaluate the biological processes influencing PCB bioaccumulation in the spider crab Maja brachydactyla. From a quantitative point of view, organotropism, diet and age were the major factors acting on contamination. From a qualitative point of view, PCB fingerprints depended on sex, and to...
Tipo: Text
Palavras-chave: Food safety; Biotransformation; Biomagnification; Food webs; Stable isotopes; Decapod crustaceans; Bioaccumulation; Polychlorinated biphenyls; Organic contaminants; Sécurité sanitaire; Biotransformation; Bioamplification; Réseaux trophiques; Isotopes stables; Crustacés décapodes; Bioaccumulation; Contaminants organiques.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/these-1149.pdf

First study of food webs in a large glacial river: the trophic role of invasive trout
Provedor de dados: Neotropical Ichthyology
Autores: Tagliaferro,Marina; Kelly,Sean P.; Pascual,Miguel.
Abstract The aim of this study was to determine the food webs structure of a large Patagonian river in two river sections (Upstream and Midstream) and to evaluate isotopic overlap between native and introduced species. We used stable isotope analyses of δ15N and δ13C and stomach content. The Upstream section had a more complex food webs structure with a greater richness of macroinvertebrates and fish species than Midstream. Upstream basal resources were dominated by filamentous algae. Lake Trout were found to have a higher trophic position than all other fish species in that area although, the most abundant fish species, were Rainbow Trout. Depending on the life stage, Rainbow Trout shifted from prey to competitor/predator. In the Midstream section, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diet; Food webs; Mixing models; Salmonids; Stable isotopes analysis.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000300210

The Invasive Rapa Whelk Rapana venosa (Valenciennes 1846): Status and potential ecological impacts in the Rio de la Plata estuary, Argentina-Uruguay
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Giberto, D.A.; Bremec, C.; Schejter, L.; Schiariti, A.; Mianzan, H.W.; Acha, E.M.
Recent range extensions of the invasive rapa whelk Rapana venosa, biological data of the population and possible ecological impacts on the food webs of the Rio de la Plata estuary are presented. A total of 41 rapa whelks and 21 egg capsules were collected between February 2004 and March 2006. Specimens were found all over the mixohaline waters of the estuary, with records off Montevideo, Samborombon Bay and off Punta Rasa. Specimens ranged between 28 and 120 mm shell length. Almost all R. venosa presented epibionts all over the shell, suggesting an exposed lifestyle. Egg-masses were attached to specimens of R. venosa, debris and plastic garbage. The spatial distribution of R. venosa within the estuary was coupled with the spatial distribution of Mactra...
Tipo: Journal Contribution
Palavras-chave: Estuaries; Introduced species; Predators; Food webs; Estuaries; Predators; Food webs; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_6163; Http://aims.fao.org/aos/agrovoc/c_10973.
Ano: 2006
URL: http://hdl.handle.net/1834/1572

Tramas tróficas en sistemas frontales del Mar Argentino: estructura, dinámica y complejidad analizada mediante isótopos estables
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Gaitán, E.N.
Two of the most important frontal systems of the Argentine Sea (SW Atlantic Ocean) were compared to obtain evidences on the regulatory mechanisms of food web length, incorporating both spatial (areas within fronts) and temporal (presence or absence of frontal structure) variability. The stable isotopes of Carbon and Nitrogen were used to evaluate the origin and composition of the organic matter used by primary consumers, the structure of food webs, the trophic levels of several taxa and the benthic-pelagic coupling within each system. In the Río de la Plata estuarine front, different sources of organic matter would support the food webs occurring in the three areas of the system. The particulate organic material (POM) would be the main resource supporting...
Tipo: Theses and Dissertations
Palavras-chave: Food webs; Trophic relationships; Trophic levels; Saline fronts; Estuarine front; Carbon isotopes; Nitrogen isotopes; Plankton; Benthos; Brackishwater fish; Marine fish; Brackishwater environment; Marine environment.
Ano: 2012
URL: http://hdl.handle.net/1834/4523

Estudio de las tramas tróficas asociadas a diferentes densidades de vieira Patagónica Zygochlamys patagonica del Atlántico SO mediante el uso de isótopos estables
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Schwartz, M.
Zygochlamys patagonica (King and Broderip, 1832) is an ecosystem engineer mollusk which forms aggregations or banks, of different densities, in the main frontal systems of the SW Atlantic Ocean. The objectives of this work were to analyze the composition, biomass, diversity and species richness of the benthic invertebrate assemblages at different scallop densities as well as the variability of their trophic webs at high and low scallop densities. For this, samples of the benthic invertebrate assemblages were taken at the Shelf Break Front with a non-selective epibenthic dredge. It was evaluated if the abundance (ind/m2) or biomass (colonial species, gr/m2) of the different taxa varied with scallop densities. The results showed that from 14 analyzed, the...
Tipo: Theses and Dissertations
Palavras-chave: Benthos; Ecological associations; Trophic relationships; Food webs; Biomass; Isotopes; Shelf fronts; Zygochlamys patagonica; Marine environment.
Ano: 2011
URL: http://hdl.handle.net/1834/4521

Redes tróficas y flujos de energía en comunidades de pozas de marea de Mar del Plata
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Fueyo Sanchez, L.
El estudio de la estructura de las redes tróficas reviste gran importancia en la comprensión de los ecosistemas por las relaciones que hay entre dicha estructura y las funciones ecosistémicas. Además ofrece una visión global de la distribución de las diferentes especies, sus interacciones y los flujos de energía que entre ellas se producen. Varios autores han observado que las redes tróficas presentan regularidades en su estructura (Briand y Cohen 1987, Cohen y Newman 1988, Pimm et al. 1991, Chen y Cohen 2001, Montoya y Solé 2003). Sin embargo, el cuerpo teórico existente hace hincapié en la descripción de la estructura de las redes y presta menos atención a su funcionamiento y a los flujos de materia y energía implicados, aunque algunos autores han hecho...
Tipo: Theses and Dissertations
Palavras-chave: Trophic relationships; Intertidal environment; Metabolism; Food webs; Intertidal environment; Metabolism; Food webs; Http://aims.fao.org/aos/agrovoc/c_3923; Http://aims.fao.org/aos/agrovoc/c_4769; Http://aims.fao.org/aos/agrovoc/c_10973.
Ano: 2008
URL: http://hdl.handle.net/1834/3879

Estudios preliminares sobre las interrelaciones tróficas de 20 especies de peces del área costera bonaerense
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Pozzobon, M.V.
Realizada en el INIDEP (Instituto Nacional de Investigación y Desarrrollo Pesquero- Mar del Plata, Argentina).
Tipo: Theses and Dissertations
Palavras-chave: Ecology; Trophic relationships; Food webs; Diets; Stomach content; Ecology; Food webs; Http://aims.fao.org/aos/agrovoc/c_2467; Http://aims.fao.org/aos/agrovoc/c_10973.
Ano: 1987
URL: http://hdl.handle.net/1834/3555

Bidimensional transfer of effects among organisms: An overlooked concept in community ecology
Provedor de dados: Revista Chilena de Historia Natural
Autores: RAMOS-JILIBERTO,RODRIGO; ARÁNGUIZ-ACUÑA,ADRIANA.
Although geneticists and population ecologist have considered in their explanations the importance of both horizontal -interspecific- and vertical -intraspecific- paths for the flow of information, energy or matter among organisms, community ecology and particularly network ecology have been strongly biased towards considering only horizontal effects. In this article our aim is to put on view of ecologists the concepts of vertical and horizontal transfer of disturbance effects in communities, and discuss the relevance of the interplay between both processes for ecological research. We support that incorporating this view into community ecology could be a promising new research avenue, and may improve our understanding about the responses of communities to...
Tipo: Journal article
Palavras-chave: Ecological networks; Ecological interactions; Food webs; Horizontal effects; Vertical effects.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000100002

FOOD WEB OF A TROPICAL HIGH MOUNTAIN STREAM: EFFECTS OF NUTRIENT ADDITION
Provedor de dados: Acta Biológica Colombiana
Autores: CASTRO-REBOLLEDO,MARÍA ISABEL; MUÑOZ-GRACIA,ISABEL; DONATO-RONDÓN,JOHN CHARLES.
In order to define the effect of nutrient enrichment on trophic webs in an Andean mountain stream we performed an experiment using stable isotope ratios (δ15N and δ13C) to analyze different trophic compartments: 1) basal level: CPOM and biofilm; 2) primary consumers - macroinvertebrates: collector-gatherers (Heterelmis sp., Thraulodes sp. and Trichorythodes sp.), and collectorfilterers (Simulium sp.); 3) predators - fish (Oncorhynchus mykiss and Trichomycterus bogotensis). The average fractionation of nitrogen among the primary consumers with respect to CPOM was 4.7 ‰, and 1.7 ‰ with respect to biofilm. Predators incremented their δ15N signal by 5.9 % with respect to primary consumers. A depletion of δ15N was observed in Impact with respect to Control...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Food webs; Gut content; Isotope ratios; Nutrient enrichment; Trophic compartments.
Ano: 2014
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2014000100004

Sandy beaches: state of the art of nematode ecology
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: MARIA,TATIANA F.; VANAVERBEKE,JAN; VANREUSEL,ANN; ESTEVES,ANDRÉ M.
ABSTRACT In this review, we summarize existing knowledge of the ecology of sandy-beach nematodes, in relation to spatial distribution, food webs, pollution and climate change. We attempt to discuss spatial scale patterns (macro-, meso- and microscale) according to their degree of importance in structuring sandy-beach nematode assemblages. This review will provide a substantial background on current knowledge of sandy-beach nematodes, and can be used as a starting point to delineate further investigations in this field. Over decades, sandy beaches have been the scene of studies focusing on community and population ecology, both related to morphodynamic models. The combination of physical factors (e.g. grain size, tidal exposure) and biological interactions...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity; Benthos; Distribution patterns; Food webs; Climatic changes.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501635