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 | Biogeography of tuna and billfish communities Auteur(s) : Reygondeau, Gabriel Maury, Olivier Beaugrand, Gregory Fromentin, Jean-marc Fonteneau, Alain Cury, Philippe Éditeur(s) : Wiley-blackwell Résumé : Aim The aims of this study were: (1) to identify global communities of tuna and billfish species through quantitative statistical analyses of global fisheries data; (2) to describe the spatial distribution, main environmental drivers and species composition of each community detected; and (3) to determine whether the spatial distribution of each community could be linked to the environmental conditions that affect lower trophic levels by comparing the partitions identified in this study with Longhursts biogeochemical provinces. Location The global ocean from 60 degrees S to 65 degrees N. Methods We implemented a new numerical procedure based on a hierarchical clustering method and a nonparametric probabilistic test to divide the oceanic biosphere into biomes and ecoregions. This procedure was applied to a database that comprised standardized data on commercial longline catches for 15 different species of tuna and billfish over a period of more than 50 years (i.e. 1953-2007). For each ecoregion identified (i.e. characteristic tuna and billfish community), we analysed the relationships between species composition and environmental factors. Finally, we compared the biogeochemical provinces of Longhurst with the ecoregions that we identified. Results Tuna and billfish species form nine well-defined communities across the global ocean. Each community occurs in regions with specific environmental conditions and shows a distinctive species composition. High similarity (68.8% homogeneity) between the spatial distribution of the communities of tuna and billfish and the biogeochemical provinces suggests a strong relationship between these species and the physical and chemical characteristics of the global ocean. Main conclusions Despite their high tolerance for a wide range of environmental conditions, these highly migratory species are partitioned into clear geographical communities in the ocean at a global scale. The similarity between biogeochemical and biotic divisions in the ocean suggests that the global ocean is a mosaic of large biogeographical ecosystems, each characterized by specific environmental conditions that have a strong effect on the composition of the trophic web. Journal Of Biogeography (0305-0270) (Wiley-blackwell), 2012-01 , Vol. 39 , N. 1 , P. 114-129 Droits : 2011 Blackwell Publishing Ltd http://archimer.ifremer.fr/doc/00060/17141/14716.pdf DOI:10.1111/j.1365-2699.2011.02582.x http://archimer.ifremer.fr/doc/00060/17141/ | Partager Voir aussi Biogeochemical provinces global ocean Istiophorus Katsuwonus macroecology Makaira marine biogeography Tetrapturus Thunnus Xiphias Télécharger |
| | Environmental noise in spawning areas: the case of Atlantic bluefin tuna (Thunnus thynnus) Auteur(s) : Royer, Francois Fromentin, Jean-marc Éditeur(s) : Blackwell science Résumé : This paper provides an exploratory analysis aiming to seek whether the colour of environmental noise theory could help in understanding the intriguing reproductive strategy of Atlantic bluefin tuna (BFT). A frequency-based approach based on spectral exponents, f(beta) with beta < 0, is chosen and applied on 10 biogeographical provinces covering the North Atlantic. The major BFT spawning area, i.e. the Mediterranean Sea, was the only one to display a pink power spectrum, whereas open ocean regions displayed more reddened fluctuations, i.e. greater variance at low frequencies. Environmental noise in the Mediterranean could, thus, offer more favourable characteristics on the long-term than the open ocean. The implications of these findings are discussed in regards to medium and long (possibly evolutionary) time scales. Fisheries Oceanography (1054-6006) (Blackwell science), 2007-03 , Vol. 16 , N. 2 , P. 202-206 Droits : 2007 Blackwell science http://archimer.ifremer.fr/doc/2007/publication-2437.pdf DOI:10.1111/j.1365-2419.2006.00424.x http://archimer.ifremer.fr/doc/00000/2437/ | Partager |
| | Les peches maritimes : complexes biogeographiques de production et provinces halieutiques Auteur(s) : Rass, Théodore S. Carre, François Éditeur(s) : ISTPM Résumé : The first part describes the evolution of the world sea fisheries from 1950 to 1977 and their present state : a decline of the growing rate of the catches, their biological structure and their distribution in the oceans according to the depth, the distance from the continent and the latitude. Then the biogeographical fishery complexes are defined, being characterized by assemblages of commercially valuable and actually caught species. These complexes are arranged according to the latitude with sometimes longitudinal subdivisions. At last with technical and economical criteria, such as the yield of the fisheries, the finality of the catches and the conditions of the exploitation which add themselves to the biogeographical complexes, the authors attempt to single out geographical fishing provinces. La première partie analyse l'évolution de la pêche mondiale de 1950 à 1977 et sa situation présente : ralentissement du rythme de la croissance des captures, composition faunistique et répartition des pêches dans l'océan selon la profondeur, la distance à la côte et la latitude. Ensuite sont définis les complexes biogéographiques de pêche, caractérisés par des assemblages d'espèces commercialement intéressantes et effectivement utilisées. Ces complexes s'ordonnent selon la latitude avec parfois des subdivisions méridiennes. Enfin, à l'aide de critères techniques et économiques, tels que le rendement des pêches, la finalité des captures et les modalités de l'exploitation qui viennent se superposer aux complexes biogéographiques, les auteurs tentent d'individualiser des provinces géographiques de pêche. Revue des Travaux de l'Institut des Pêches Maritimes (0035-2276) (ISTPM), 1980-06 , Vol. 44 , N. 2 , P. 89-117 Droits : Ifremer http://archimer.ifremer.fr/doc/1980/publication-1947.pdf http://archimer.ifremer.fr/doc/00000/1947/ | Partager |
| | Patterns of variations in large pelagic fish: A comparative approach between the Indian and the Atlantic Oceans Auteur(s) : Corbineau, A. Rouyer, Tristan Fromentin, Jean-marc Cazelles, B. Fonteneau, Alain Menard, Frederic Éditeur(s) : Pergamon-elsevier Science Ltd Résumé : Catch data of large pelagic fish such as tuna, swordfish and billfish are highly variable ranging from short to long term. Based on fisheries data, these time series are noisy and reflect mixed information on exploitation (targeting, strategy, fishing power), population dynamics (recruitment, growth, mortality, migration, etc.), and environmental forcing (local conditions or dominant climate patterns). In this work, we investigated patterns of variation of large pelagic fish (i.e. yellowfin tuna, bigeye tuna, swordfish and blue marlin) in Japanese longliners catch data from 1960 to 2004. We performed wavelet analyses on the yearly time series of each fish species in each biogeographic province of the tropical Indian and Atlantic Oceans. In addition, we carried out cross-wavelet analyses between these biological time series and a large-scale climatic index, i.e. the Southern Oscillation Index (Sol). Results showed that the biogeographic province was the most important factor structuring the patterns of variability of Japanese catch time series. Relationships between the SOI and the fish catches in the Indian and Atlantic Oceans also pointed out the role of climatic variability for structuring patterns of variation of catch time series. This work finally confirmed that Japanese longline CPUE data poorly reflect the underlying population dynamics of tunas. (C) 2010 Elsevier Ltd. All rights reserved. Progress In Oceanography (0079-6611) (Pergamon-elsevier Science Ltd), 2010-07 , Vol. 86 , N. 1-2 , P. 276-282 Droits : 2010 Elsevier B.V. All rights reserved. http://archimer.ifremer.fr/doc/00011/12231/9029.pdf DOI:10.1016/j.pocean.2010.04.019 http://archimer.ifremer.fr/doc/00011/12231/ | Partager |
| | Benthic communities of the argentine continental-shelf Auteur(s) : Bastida, R Roux, A Martinez, De Éditeur(s) : Gauthier-Villars Résumé : The benthic macroinvertebrate assemblages of the Argentine continental shelf were studied from samples of molluscs, echinoderms and bryozoans collected by the RN Shinkai Maru. Two major faunal groups were distinguished: one inhabiting the warmer inner shelf off Buenos Aires and northern Patagonia, and the other occupying the colder middle and outer shelf off Buenos Aires and most of the Patagonian shelf. These results confirm the traditional biogeographic division of the Argentine continental shelf into two provinces: Argentine and Magellanic. Furthermore, the results suggest the possibility of subdividing the Atlantic sector of the Magellanic province into two districts: Patagonian and Malvinean, under the influence of the Patagonian and the Malvinas current, respectively. Oceanologica Acta (0399-1784) (Gauthier-Villars), 1992 , Vol. 15 , N. 6 , P. 687-698 Droits : info:eu-repo/semantics/openAccess http://archimer.ifremer.fr/doc/00101/21234/18851.pdf http://archimer.ifremer.fr/doc/00101/21234/ | Partager Voir aussi BENTHIC COMMUNITIES ARGENTINE CONTINENTAL SHELF SOUTHWESTERN ATLANTIC BIOGEOGRAPHY SEDIMENTS Télécharger |
| | Biogeographic relationships among deep-sea hydrothermal vent faunas at global scale Auteur(s) : Bachraty, Charleyne Legendre, P. Desbruyeres, Daniel Éditeur(s) : Elsevier Résumé : The discovery of deep-sea hydrothermal vent fauna, kilometres deep in the oceans, is a great achievement of 20th-century marine biology. The deep-sea hydrothermal food web does not directly depend on the sun's energy. Vent communities rely primarily on trophic associations between chemoautotrophic bacteria and consumers A small. number of endemic taxa are adapted to the inhospitable vent environments that are distributed along ridge crests. Where these vent communities originated and how they dispersed are among the important questions ecologists must answer. Here, by statistical analysis of the most comprehensive database ever assembled about deep-sea hydrothermal fauna, we delineate six major hydrothermal provinces in the world ocean and identify seven possible dispersal pathways between adjacent provinces. Our model suggests that the East-Pacific Rise may have played a pivotal role as a centre of dispersal for the hydrothermal fauna. Our data-driven conclusion will have to be tested by phylogenetic studies and completed by surveys of less-explored fields. Deep Sea Research Part I: Oceanographic Research Papers (0967-0637) (Elsevier), 2009-08 , Vol. 56 , N. 8 , P. 1371-1378 Droits : 2009 Elsevier Ltd All rights reserved. http://archimer.ifremer.fr/doc/2009/publication-6936.pdf http://archimer.ifremer.fr/doc/2009/sup-6936.xls DOI:10.1016/j.dsr.2009.01.009 http://archimer.ifremer.fr/doc/00000/6936/ | Partager |