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Heterogeneous energetic pathways and carbon sources on deep eastern Mediterranean cold seep communities ArchiMer
Carlier, Antoine; Ritt, Benedicte; Rodrigues, Clara F.; Sarrazin, Jozee; Olu, Karine; Grall, Jacques; Clavier, Jacques.
Cold seep communities in the Mediterranean Sea have only been discovered two decades ago, and their trophic ecology has been the subject of very few studies. We investigated the benthic food web of two deep chemosynthesis-based ecosystems on the Napoli and Amsterdam mud volcanoes (MVs) in the eastern Mediterranean Sea (similar to 2,000 m depth). Seeping methane has been detected at the surface of both MVs during pioneering cruises and has been hypothesised to be assimilated by benthic fauna as observed in other oceans' margins. Given the extreme oligotrophic character of the eastern Mediterranean Sea, we a priori expected that chemosynthetic food sources, especially methane-derived carbon (MDC), played a major trophic role in these deep seep communities...
Tipo: Text Palavras-chave: Gulf of Mexico; Anaerobic methane oxidation; Stable isotope analysis; Sea hydrothermal vents; Food web structure; Kazan mud volcano; Florida escarpment; Trophic relationships; Benthic communauties; Lamellibrachia SP.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00016/12684/9633.pdf
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Is benthic food web structure related to diversity of marine macrobenthic communities? ArchiMer
Sokolowski, Adam; Wolowicz, M.; Asmus, H.; Asmus, R.; Carlier, Antoine; Gasiunaite, Z.; Gremare, Antoine; Hummel, H.; Lesutiene, J.; Razinkovas, A.; Renaud, Paul; Richard, P.; Kedra, M..
Numerical structure and the organisation of food webs within macrozoobenthic communities has been assessed in the European waters (Svalbard, Barents Sea, Baltic Sea, North Sea, Atlantic Ocean and the Mediterranean Sea) to address the interactions between biodiversity and ecosystem functioning. Abundance and classical species diversity indices (S, H', J) of macrofaunal communities were related to principal attributes of food webs (relative trophic level and food chain length, FCL) that were determined from carbon and nitrogen stable isotope values. Structure of marine macrobenthos varies substantially at a geographical scale; total abundance ranges from 63 ind. m(-2) to 34,517 ind. m(-2), species richness varies from 3 to 166 and the Shannon-Weaver...
Tipo: Text Palavras-chave: Macrobenthic communities; Biodiversity; Food web structure; Diversity-structure interactions; European waters.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00093/20378/18214.pdf
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Modeling trophic interactions in Lake Kivu: What roles do exotics play? ArchiMer
Villanueva, Ching-maria; Isumbisho, M; Kaningini, B; Moreau, J; Micha, J.
An Ecopath model of the southern part of Lake Kivu, a deep African equatorial lake was constructed to quantitatively describe the possible impact of fish introductions in this ecosystem. This study is considered as an initial step in summarizing ecological and biological information, under a coherent framework, on this ecosystem. Fourteen compartments were considered. As a phytoplankton-based food web, it is observed that key food sources are not fully utilized as transfer efficiencies per trophic levels (TL) varies between 4.5 and 9.4%. Zooplankton plays a major role in transferring organic matter from TL1 to higher TLs due to the abundance of zooplanktivores. Shifts in food preferences and distribution of some of the fish functional groups were observed...
Tipo: Text Palavras-chave: Lake Kivu; Exotic fishes; Invasion; Transfer efficiency; Food web structure.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4722.pdf
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Spatial and temporal variations in food web structure from newly-opened habitat at hydrothermal vents ArchiMer
Gaudron, Sylvie Marylene; Lefebvre, Sebastien; Jorge, Amandine Nunes; Gaill, Francoise; Pradillon, Florence.
To highlight the spatio-temporal variability of the food web structure of hydrothermal vent fauna from newly-opened habitat, a series of Titanium Ring for Alvinellid Colonization devices (TRACs) was deployed at TICA site on the East Pacific Rise in 2006. This experiment was conducted for periods of 4 days, 13 days and one month and deployments were aligned along a gradient from the basaltic bottom to the vent openings. delta C-13 values of colonists revealed a narrower range of carbon sources in proximity to vent openings in Alvinella pompejana habitat than in Tevnia jerichonana habitat, separated by a distance of four meters. This was possibly due to a spatial change in available food sources with a possible higher contribution of particulate organic...
Tipo: Text Palavras-chave: Trophic relationships; Food web structure; Hydrothermal vent; East Pacific Rise; Stable isotopes; Colonization experiment; TRACs; Alvinella pompejana; Epibiosis.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00085/19580/19581.pdf
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The dynamics of natural populations: feedback structures in fluctuating environments RChHN
LIMA,MAURICIO.
The fluctuations exhibited by natural populations have fascinated ecologists for the last eighty years. However, a vigorous debate between different schools of population ecologists has hampered reaching a consensus about the causes of such numerical fluctuations. Recent findings and a more synthetic view of population change espoused by ecologists, statisticians, and mathematicians have integrated the role of nonlinear feedback (deterministic) and external environmental (deterministic or stochastic) processes in the dynamics of natural populations. The new challenge for population ecologists is to understand how these two different forces interact in nature. In this commentary, I review some of the basic principles of population analysis during the last...
Tipo: Journal article Palavras-chave: Population dynamics; Feedback structure; Exogenous factors; Seasonal regulation; Stochasticity; Food web structure; Climate.
Ano: 2001 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200009
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Trophic connectivity between offshore upwelling and the inshore food web of Banc d’Arguin (Mauritania): New insights from isotopic analysis ArchiMer
Carlier, Antoine; Chauvaud, Laurent; Van Der Geest, Matthijs; Le Loc'H, Francois; Le Duff, Michel; Vernet, Marc; Raffray, Jean; Diakhate, Djibril; Labrosse, Pierre; Wague, Abdoulaye; Le Goff, Clement; Gohin, Francis; Chapron, Bertrand; Clavier, Jacques.
Banc d’Arguin (BA), Mauritania, is a nationally protected shallow gulf > 10,000 km2 between the Sahara desert and the upwelling system off the Mauritanian coast. In the southeast, BA consists of a 500 km2 tidal flat, the most important wintering site for shorebirds using the East Atlantic Flyway. The Mauritanian upwelling-driven phytoplankton production supports the most productive fisheries worldwide, but little is known about its trophic role in the functioning of the inshore BA food web. Using stable isotopes as trophic tracers to distinguish between upwelling-driven phytoplankton, open ocean phytoplankton, and benthic primary producers, we assessed the spatial extent to which the inshore BA food web is fuelled by upwelling-driven phytoplankton...
Tipo: Text Palavras-chave: Banc d'Arguin; West Africa; Food web structure; Remote sensing; Stable isotope; Upwelling.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00269/37999/36078.pdf
Registros recuperados: 6
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