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Large-Scale Diversity of Slope Fishes: Pattern Inconsistency between Multiple Diversity Indices ArchiMer
Gaertner, Jean-claude; Maiorano, Porza; Merigot, Bastien; Colloca, Francesco; Politou, Chrissi-yianna; Gil De Sola, Luis; Bertrand, Jacques; Murenu, Matteo; Durbec, Jean-pierre; Kallianiotis, Argyris; Mannini, Alessandro.
Large-scale studies focused on the diversity of continental slope ecosystems are still rare, usually restricted to a limited number of diversity indices and mainly based on the empirical comparison of heterogeneous local data sets. In contrast, we investigate large-scale fish diversity on the basis of multiple diversity indices and using 1454 standardized trawl hauls collected throughout the upper and middle slope of the whole northern Mediterranean Sea (36 degrees 3' - 45 degrees 7' N; 5 degrees 3'W - 28 degrees E). We have analyzed (1) the empirical relationships between a set of 11 diversity indices in order to assess their degree of complementarity/redundancy and (2) the consistency of spatial patterns exhibited by each of the complementary groups of...
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Ano: 2013 URL: http://archimer.ifremer.fr/doc/00152/26299/24392.pdf
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Reproducibility of the multi-component aspect of species diversity across different areas and scales: towards the constitution of a shortlist of complementary indices for monitoring fish diversity? ArchiMer
Gaertner, Jean-claude; Merigot, Bastien; Relini, Giulio; Bertrand, Jacques; Mazouni, Nabila; Politou, Chrissi-yianna; Gil De Sola, Luis; Kallianiotis, Argyris; Carpentieri, Paolo; Murenu, Matteo; Durbec, Jean-pierre; Vrgoc, Nedo; Ungaro, Nicola.
Recent theoretical and field studies conducted in both terrestrial and marine ecosystems have suggested that diversity could be a more complex and multi-component concept than previously thought. However, it is still poorly understood to what extent the information provided by the various indices is complementary with regard to diversity, and to what extent this complementarity is reproducible in different situations or at different scales of observation. In the present work, we have analysed the reproducibility of the empirical relationships between 11 diversity indices related to four major aspects (components) of species diversity (species richness, rarity, evenness and species taxonomy) in order to determine whether there is a general pattern of...
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Ano: 2010 URL: http://archimer.ifremer.fr/doc/00029/14064/11382.pdf
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Effects of lunar cycle and fishing operations on longline-caught pelagic fish: fishing performance, capture time, and survival of fish ArchiMer
Poisson, Francois; Gaertner, Jean-claude; Taquet, Marc; Durbec, Jean-pierre; Bigelow, Keith.
Commercial longline fishing data were analyzed and experiments were conducted with gear equipped with hook timers and time-depth recorders in the Reunion Island fishery (21 degrees 5'S lat., 53 degrees 28'E long.) to elucidate direct and indirect effects of the lunar cycle and other operational factors that affect catch rates, catch composition, fish behavior, capture time, and fish survival. Logbook data from 1998 through 2000, comprising 2009 sets, indicated that swordfish (Xiphias gladius) catch-per unit of effort (CPUE) increased during the first and last quarter of the lunar phase, whereas albacore (Thunnus alalunga) CPUE was highest during the full moon. Swordfish were caught rapidly after the longline was set and, like bigeye tuna (Thunnus obesus),...
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Ano: 2010 URL: http://archimer.ifremer.fr/doc/00011/12237/9019.pdf
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'Phytoplankton events' in French coastal waters during 1987–1997 ArchiMer
Beliaeff, Benoit; Gros, Philippe; Belin, Catherine; Raffin, Bernard; Gailhard, Isabelle; Durbec, Jean-pierre.
This study aims to propose a tool to describe the long-term (10 years) variability of phytoplanktonic assemblages monitored by Rephy (French monitoring programme for phytoplankon and phycotoxins) in the English Channel, the Bay of Biscay and the Mediterranean French coastal waters. According to the sampling strategy (systematic survey, with a time-step of 1 or 2 weeks, and a between-sampling station distance ranging from less than one to several kilometres), the information content of the data is mainly relevant to the characterization of seasonal variability of populations at the mesoscale. For any given area, and for each of the 56 taxinomic units considered here, the data are thus processed in order to recognize the temporal succession of ‘phytoplankton...
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Ano: 2001 URL: http://archimer.ifremer.fr/doc/00013/12403/9189.pdf
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