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| Decker, Carole; Olu, Karine. |
| The Hakon Mosby mud volcano (HMMV) is one of the most studied cold-seep sites in Europe. Its exceptional fluid expulsion activity and large geochemical gradients from the centre to the periphery support dense biological communities and induce spatial heterogeneity in microbial activity and faunal zonation. At this site, the macrofauna has been little studied and the variability in its macrobenthic nutrition has not yet been investigated. In this study, based on the analysis of the stable isotopes of carbon and nitrogen, we determined nutritional patterns for macrofauna communities in three different habitats (microbial mats, sediment adjacent to the mat and Siboglinidae polychaete fields). delta C-13 values of macrofaunal tissues varied among two habitats... |
| Tipo: Text |
Palavras-chave: Cold seep; Hakon Mosby; Macrofaunal nutrition; Stable isotope analysis. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00019/13043/10161.pdf |
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| Syvaeranta, Jari; Martino, Aurelia; Kopp, Dorothee; Cereghino, Regis; Santoul, Frederic. |
| We tested the impacts of most common sample preservation methods used for aquatic sample materials on the stable isotope ratios of carbon and nitrogen in clams, a typical baseline indicator organism for many aquatic food web studies utilising stable isotope analysis (SIA). In addition to common chemical preservatives ethanol and formalin, we also assessed the potential impacts of freezing on delta C-13 and delta N-15 values and compared the preserved samples against freshly dried and analysed samples. All preservation methods, including freezing, had significant impacts on delta C-13 and delta N-15 values and the effects in general were greater on the carbon isotope values (1.3-2.2aEuro degrees difference) than on the nitrogen isotope values (0.9-1.0aEuro... |
| Tipo: Text |
Palavras-chave: Formalin; Freezing; Ethanol; Preservation; Stable isotope analysis. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00021/13192/10271.pdf |
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| Decker, Carole; Olu, Karine. |
| The relative contribution of chemosynthesis in heterotrophic fauna at seeps is known to be influenced by depth and by habitat. Using stable isotopes of carbon and nitrogen, we investigated macro- and megafaunal nutritional patterns in Norwegian margin cold seeps by comparing food webs both among habitats within a seep site and between different sites. The very active Håkon Mosby mud volcano (HMMV) is characterized by geochemical gradients, microbial activity and faunal zonation from the centre to the periphery. The Storegga Slide (600–900 m depth) has pockmarks with patchy less active seeps, and also shows concentric zonation of habitats but at much smaller spatial scale. The dominant carbon source for macrofaunal nutrition in both areas was... |
| Tipo: Text |
Palavras-chave: Cold-seep; Macrofaunal nutrition; Methane-derived carbon; Norwegian margin; Stable isotope analysis. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00074/18518/16164.pdf |
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| 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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| Dehnhard, Nina; Achurch, Helen; Clarke, Judy; Michel, Loic; Southwell, Colin; Sumner, Michael D.; Eens, Marcel; Emmerson, Louise. |
| 1.Ecological niche theory predicts sympatric species to show segregation in their spatio‐temporal habitat utilization or diet as a strategy to avoid competition. Similarly, within species individuals may specialise on specific dietary resources or foraging habitats. Such individual specialisation seems to occur particularly in environments with predictable resource distribution and limited environmental variability. Still little is known about how seasonal environmental variability affects segregation of resources within species and between closely related sympatric species. 2.The aim of the study was to investigate the foraging behaviour of three closely related and sympatrically breeding fulmarine petrels (Antarctic petrels Thalassoica antarctica, cape... |
| Tipo: Text |
Palavras-chave: Antarctica; Biologging; Expectation-Maximization binary Clustering (EMbC); Fulmarine petrel; Generalized additive model (GAM); Kernel distribution; Model cross-validation; Stable isotope analysis. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00509/62056/66218.pdf |
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| Peron, Clara; Gremillet, David; Prudor, Aurelien; Pettex, Emeline; Saraux, Claire; Soriano-redondo, Andrea; Authier, Matthieu; Fort, Jerome. |
| Marine Protected Areas (MPAs) are being established across all marine regions but their validity for the conservation of highly mobile marine vertebrates has been questioned. We tested the hypothesis that French coastal MPAs primarily designed for coastal and benthic biota are also beneficial for the conservation of a pelagic seabird, the Vulnerable yelkouan shearwater (Puffinus yelkouan), an endemic species to the Mediterranean Sea. We used a vast spectrum of electronic devices (GPS, temperature-depth-recorders, satellite transmitters and geolocators) and stable isotopic analyses to study the year-round movements and the trophic status of yelkouan shearwaters from the Hyères archipelago (France). In addition we conducted large-scale ship and aircrafts... |
| Tipo: Text |
Palavras-chave: Aerial surveys; At-sea observations; Biotelemetry; Conservation biogeography; Spatial planning; Stable isotope analysis. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00163/27460/26393.pdf |
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| Irion, Solène; Christaki, Urania; Berthelot, Hugo; L’helguen, Stéphane; Jardillier, Ludwig. |
| Phytoplankton is composed of a broad-sized spectrum of phylogenetically diverse microorganisms. Assessing CO2-fixation intra- and inter-group variability is crucial in understanding how the carbon pump functions, as each group of phytoplankton may be characterized by diverse efficiencies in carbon fixation and export to the deep ocean. We measured the CO2-fixation of different groups of phytoplankton at the single-cell level around the naturally iron-fertilized Kerguelen plateau (Southern Ocean), known for intense diatoms blooms suspected to enhance CO2 sequestration. After the bloom, small cells (<20 µm) composed of phylogenetically distant taxa (prymnesiophytes, prasinophytes, and small diatoms) were growing faster (0.37 ± 0.13 and 0.22 ± 0.09... |
| Tipo: Text |
Palavras-chave: Biogeochemistry; Microbial ecology; Stable isotope analysis. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00684/79595/82286.pdf |
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