| Enregistrements |
| Auteur |
Barneche, D.R.; Rezende, E.L.; Parravicini, V.; Maire, Eva; Edgar, G.J.; Stuart-Smith, R.D.; Arias-Gonzalez, J.E.; Ferreira, C.E.L.; Friedlander, A.M.; Green, A.L.; Luiz, O.J.; Rodriguez-Zaragoza, F.A.; Vigliola, L.; Kulbicki, M.; Floeter, S.R. |
Titre  |
Body size, reef area and temperature predict global reef-fish species richness across spatial scales |
Type |
Article scientifique |
| Année |
2019 |
Publication |
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Revue Abrégée |
Glob. Ecol. Biogeogr. |
| Volume |
28 |
Numéro |
3 |
Pages |
315-327 |
| Mots-Clés |
biodiversity; diversity; patterns; coral-reefs; spatial scale; community assembly; biogeography; extrapolation; local diversity; neutral theory; range size; rarefaction; regional diversity; species energy |
| Résumé |
Aim To investigate biotic and abiotic correlates of reef-fish species richness across multiple spatial scales. Location Tropical reefs around the globe, including 485 sites in 109 sub-provinces spread across 14 biogeographic provinces. Time period Present. Major taxa studied 2,523 species of reef fish. Methods We compiled a database encompassing 13,050 visual transects. We used hierarchical linear Bayesian models to investigate whether fish body size, reef area, isolation, temperature, and anthropogenic impacts correlate with reef-fish species richness at each spatial scale (i.e., sites, sub-provinces, provinces). Richness was estimated using coverage-based rarefaction. We also tested whether species packing (i.e., transect-level species richness/m(2)) is correlated with province-level richness. Results Body size had the strongest effect on species richness across all three spatial scales. Reef area and temperature were both positively correlated with richness at all spatial scales. At the site scale only, richness decreased with reef isolation. Species richness was not correlated with proxies of human impacts. Species packing was correlated with species richness at the province level following a sub-linear power function. Province-level differences in species richness were also mirrored by patterns of body size distribution at the site scale. Species-rich provinces exhibited heterogeneous assemblages of small-bodied species with small range sizes, whereas species-poor provinces encompassed homogeneous assemblages composed by larger species with greater dispersal capacity. Main conclusions Our findings suggest that body size distribution, reef area and temperature are major predictors of species richness and accumulation across scales, consistent with recent theories linking home range to species-area relationships as well as metabolic effects on speciation rates. Based on our results, we hypothesize that in less diverse areas, species are larger and likely more dispersive, leading to larger range sizes and less turnover between sites. Our results indicate that changes in province-level (i.e., regional) richness should leave a tractable fingerprint in local assemblages, and that detailed studies on local-scale assemblage composition may be informative of responses occurring at larger scales. |
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English |
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1466-822x |
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pas de |
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MARBEC @ isabelle.vidal-ayouba @ |
collection |
2522 |
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| Auteur |
Escalle, L.; Gaertner, D.; Chavance, P.; Murua, H.; Simier, M.; Jose Pascual-Alayon, P.; Menard, F.; Ruiz, J.; Abascal, F.; Mérigot, B. |
| Titre |
Catch and bycatch captured by tropical tuna purse-seine fishery in whale and whale shark associated sets: comparison with free school and FAD sets |
Type |
Article scientifique |
| Année |
2019 |
Publication |
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Revue Abrégée |
Biodivers. Conserv. |
| Volume |
28 |
Numéro |
2 |
Pages |
467-499 |
| Mots-Clés |
diversity; mortality; atlantic; biology; Bycatch; strategies; Megafauna; behavior; dominance; yellowfin; Catch composition; Diversity; Ecosystem approach to fisheries management; swimming speeds; Tuna purse-seine fishery |
| Résumé |
In an ecosystem approach to fisheries management (EAFM) framework of the tuna purse-seine fishery, the assessment of target species, but also that of bycatch species, is essential. In the Atlantic and Indian oceans, purse-seine nets are sometimes set around tuna schools associated with whale sharks and baleen whales, although less frequently than around free-swimming tuna schools or those associated with fish aggregating devices (FAD). However, knowledge on the targeted catch and bycatch in these megafauna associated fishing sets is still relatively limited. Therefore, the aims of this study were to assess species and size composition of the target tuna species, as well as the diversity of bycatch species in whale and whale shark associated sets. Whale associated sets were found to be very similar to free school sets in terms of tuna catch (large yellowfin tuna), bycatch occurrence (presence in half the sets) and species assemblage (alpha and beta diversity). Whale shark associated sets were intermediate between FAD and free school sets, with tuna catch (skipjack and juvenile yellowfin) closer to FAD than to free school sets. However, the presence of large yellowfin, the bycatch composition (with almost no finfish, abundantly captured in FAD sets) and the species assemblage showed similarity with free school sets. This study highlights the need for an EAFM in the tuna purse-seine fishery by providing knowledge on pelagic multi-specific catches and bycatches. |
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English |
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| ISSN |
0960-3115 |
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pas de |
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MARBEC @ alain.herve @ |
collection |
2482 |
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| Auteur |
Blanchet, M.; Pringault, O.; Bouvy, M.; Catala, P.; Oriol, L.; Caparros, J.; Ortega-Retuerta, E.; Intertaglia, L.; West, N.; Agis, M.; Got, P.; Joux, F. |
| Titre |
Changes in bacterial community metabolism and composition during the degradation of dissolved organic matter from the jellyfish Aurelia aurita in a Mediterranean coastal lagoon |
Type |
Article scientifique |
| Année |
2015 |
Publication |
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Revue Abrégée |
Environ Sci Pollut Res |
| Volume |
22 |
Numéro |
18 |
Pages |
13638-13653 |
| Mots-Clés |
Aurelia aurita; Bacterial diversity; Bacterial growth efficiency; biodegradation; heterotrophic bacteria; jellyfish; Organic matter |
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English |
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0944-1344 |
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pas de |
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MARBEC @ alain.herve @ |
collection |
1387 |
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| Auteur |
Ndiaye, W.; Thiaw, M.; Diouf, K.; Ndiaye, P.; Thiaw, O.T.; Panfili, J. |
| Titre |
Changes in population structure of the white grouper Epinephelus aeneus as a result of long-term overexploitation in Senegalese waters |
Type |
Article scientifique |
| Année |
2013 |
Publication |
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Revue Abrégée |
African Journal of Marine Science |
| Volume |
35 |
Numéro |
4 |
Pages |
465-472 |
| Mots-Clés |
West Africa; africa; biological indicators; communities; diversity; evaluate; fishing pressure; hermaphroditism; indicators; length at maturity; management; reef fishes; serranidae; size; size spectra; spectrum |
| Résumé |
In Senegal, a significant decrease in catches indicates that many demersal fish stocks are being overexploited. The white grouper Epinephelus aeneus, locally known as the 'thiof', is exploited by both small-scale and industrial fisheries. A 28-year database of E. aeneus catches along the Senegalese coast provided by the Centre for Oceanographic Research of Dakar-Thiaroye, and size at maturity measured in Dakar (Senegal) from monthly samples in 2010, were used to analyse changes in population structure in the area over the past 37 years. Catches from the northern fishing areas were lower than those from the southern fishing areas, and decreased steadily during the period (Kolmogorov-Smirnov test, D = 0.243, p = 0.0002). The individual mean weight of catches decreased from 1974 to 2010 (linear regression, r(2) = 0.40, n = 37) and only 60% of the individuals were mature. The calculated sizes at maturity were 49 cm total length (TL) for females and 55 cm for males, and the optimal length of capture for a sustainable fishery was 96 cm, but only 0.03% of E. aeneus caught reached this length. Most of the catch consisted of juveniles; the larger reproductive individuals had disappeared. The number of individuals caught decreased significantly between 1974 and 2010 (1974-1983, r(2) = 0.98, n = 74 674; 1984-1993, r(2) = 0.95, n = 96 696; 1994-2003, r(2) = 0.93, n = 12 619; 2004-2010, r(2) = 0.91, n = 12 887), whereas the length range remained the same (10-110 cm TL). Biological indicators clearly showed that E. aeneus stocks in Senegal are overexploited and the species is now endangered. Immediate active management of fishing pressure is needed, therefore, to maintain E. aeneus populations in the area. Our results suggest a minimum size of <50 cm should be introduced and that fishing effort should be reduced. |
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English |
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1814-232x |
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MARBEC @ isabelle.vidal-ayouba @ |
collection |
484 |
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| Auteur |
Said, O.B.; Louati, H.; Soltani, A.; Preud’homme, H.; Cravo-Laureau, C.; Got, P.; Pringault, O.; Aissa, P.; Duran, R. |
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Changes of benthic bacteria and meiofauna assemblages during bio-treatments of anthracene-contaminated sediments from Bizerta lagoon (Tunisia) |
Type |
Article scientifique |
| Année |
2015 |
Publication |
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Revue Abrégée |
Environ Sci Pollut Res |
| Volume |
22 |
Numéro |
20 |
Pages |
15319-15331 |
| Mots-Clés |
Anthracene; Atmospheric Protection/Air Quality Control/Air Pollution; Bacteria diversity; Bioremediation; Bizerta lagoon; Community structure; Degradation; Ecotoxicology; Environmental Chemistry; Environmental Health; Environment, general; Meiofauna; Microcosms; PAH degraders; Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution |
| Résumé |
Sediments from Bizerta lagoon were used in an experimental microcosm setup involving three scenarios for the bioremediation of anthracene-polluted sediments, namely bioaugmentation, biostimulation, and a combination of both bioaugmentation and biostimulation. In order to investigate the effect of the biotreatments on the benthic biosphere, 16S rRNA gene-based T-RFLP bacterial community structure and the abundance and diversity of the meiofauna were determined throughout the experiment period. Addition of fresh anthracene drastically reduced the benthic bacterial and meiofaunal abundances. The treatment combining biostimulation and bioaugmentation was most efficient in eliminating anthracene, resulting in a less toxic sedimentary environment, which restored meiofaunal abundance and diversity. Furthermore, canonical correspondence analysis showed that the biostimulation treatment promoted a bacterial community favorable to the development of nematodes while the treatment combining biostimulation and bioaugmentation resulted in a bacterial community that advantaged the development of the other meiofauna taxa (copepods, oligochaetes, polychaetes, and other) restoring thus the meiofaunal structure. The results highlight the importance to take into account the bacteria/meiofauna interactions during the implementation of bioremediation treatment. |
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Éditeur |
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en |
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0944-1344, 1614-7499 |
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Approuvé |
pas de |
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MARBEC @ isabelle.vidal-ayouba @ |
collection |
1415 |
| Lien permanent pour cet enregistrement |
