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| Jac, Cyrielle; Dupont, Priscilla; Gaboriau, Matthias; Mercky, Yann; Pelletier, Dominique; Roos, David; Sucre, Elliott; Claverie, Thomas. |
| In days of increasingly threatened marine tropical ecosystems, it is important to improve knowledge on understudied but taxonomically rich habitats. If fish assemblages from barrier and fringing reefs are generally well studied, patch reefs are much less known. The objective of the present study (part of the EPICURE project) was to better understand taxonomic and functional specificity of patch reefs fish assemblages compared to the well-studied subtidal reef flat and outer slope habitats. Unbaited rotating video systems (STAVIRO) were used to quantify fish abundance on two sitesfrom the northern Mozambic channel (Mayotte Iris bank and Geyser bank). Taxonomic and functional diversity metrics were used to compare assemblages among habitats. None of the... |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00614/72586/71574.pdf |
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| Jac, Cyrielle; Desroy, Nicolas; Certain, Gregoire; Foveau, Aurelie; Labrune, Céline; Vaz, Sandrine. |
| By relating observed changes to the pressures suffered, the Marine Strategy Framework Directive intends to better control the factors of environmental degradation and to manage their consequences in European waters. Several descriptors are defined within the framework of the MFSD and in particular descriptor 1 relating to the biological diversity of the seabed and descriptor 6 relating to the seabed integrity (i.e. the quality of their structures and functions). For each descriptor, indicators and threshold values must be defined and a novel conceptual approach to define and detect seabed integrity thresholds is proposed here. Bottom trawling being the main source of shelf continental disturbance, it is important to evaluate its impact on benthic habitat.... |
| Tipo: Text |
Palavras-chave: GES; Threshold values; Trawling impact; Indices; MFSD. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00634/74575/74464.pdf |
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| Jac, Cyrielle; Desroy, Nicolas; Certain, Gregoire; Foveau, Aurelie; Labrune, Céline; Vaz, Sandrine. |
| The benthic fauna of European continental shelves is a severely impacted community, mostly due to intense bottom trawling activity. Trawling effect may be dependent on the spatial and temporal distribution of abrasion, the habitat type including natural perturbation intensity and the fishing gear used. Nonetheless, there is an urgent need to identify or develop indices likely to measure the effect of trawling. For this purpose benthic fauna by-catch monitored in scientific trawl surveys carried out in all European waters in the frame of the Common Fishery Policy Data Collection Multiannual Program may be used. Benthic invertebrates data used in this study were collected during scientific bottom trawl surveys covering the English Channel, the North Sea and... |
| Tipo: Text |
Palavras-chave: Benthic sensitivity; Trawling effect; Indices; Seabed integrity; MSFD. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00635/74693/74606.pdf |
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| Roos, David; Dupont, Priscilla; Gaboriau, Matthias; Bigot, Lionel; Durville, Patrick; Mulochau, Thierry; Pinault, Mathieu; Wickel, Julien; Urbina-barreto, Isabel; Mouquet, Pascal; Maurel, Laurence; Cantou, Michel; Fallourd, Sophie; Guilbert, Antonin; Hoarau, Jean-marc; Aumond, Yoann; Huet, Jerome; Evano, Hugues; Sabathe, Yoann; Giannasi, Paul; Adami, Paul; Mercky, Yann; Jac, Cyrielle; Sucre, Elliott; Pelletier, Dominique; Claverie, Thomas. |
| For the first time ever at such a spatial scale, the EPICURE project is using the complementary exosystemic, functional and fisheries approaches to analyze and compare the partially exploited fish‐populating structure of the Geyser, Zélée, and Iris banks. This project focuses on three main points, which are 1) a habitat map of the three banks and an assessment of the live coral coverage as a proxy of the Geyser bank’s health, 2) a description of fish assemblages and a functional analysis relative to habitat type and time and 3) an estimate of the abundance index in structure size of the main exploited stocks. Overall, 42 habitats over 268 km² were mapped on the Geyser bank with 534 field verifications. On the Zélée bank, 24 habitats were mapped over 183... |
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Palavras-chave: Peuplements ichtyologiques; Communautés récifales; Indicateurs populationnels; Approche fonctionnelle; Stocks halieutiques; Cartographie; Habitats; Bancs récifaux; Geyser; Iris; Zélée; Canal du Mozambique; Fish populating; Reef community; Population index; Functional approach; Fisheries stocks; Habitat map; Reef bank; Geyser; Zélée; Iris; Mozambican channel. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00434/54549/55924.pdf |
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| Saraux, Claire; Van Beveren, Elisabeth; Brosset, Pablo; Queiros, Quentin; Bourdeix, Jean-herve; Dutto, Gilbert; Gasset, Eric; Jac, Cyrielle; Bonhommeau, Sylvain; Fromentin, Jean-marc. |
| Around 2008, an ecosystem shift occurred in the Gulf of Lions, highlighted by considerable changes in biomass and fish mean weight of its two main small pelagic fish stocks (European anchovy, Engraulis encrasicolus; European sardine, Sardina pilchardus). Surprisingly these changes did not appear to be mediated by a decrease in fish recruitment rates (which remained high) or by a high fishing pressure (exploitation rates being extremely low). Here, we review the current knowledge on the population's dynamics and its potential causes. We used an integrative ecosystem approach exploring alternative hypotheses, ranging from bottom-up to top-down control, not forgetting epizootic diseases. First, the study of multiple population characteristics highlighted a... |
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Palavras-chave: Population dynamics; Top-down; Disease; Zooplankton; Exploited species; Bottom-up. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00427/53861/54903.pdf |
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