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Feeding habits of Nezumia aequalis (Günter, 1878) (Pisces: Macrouridae) of three deep-sea areas with different trophic pathways (southern Bay of Biscay)

AuthorsPreciado, I.; Frutos, I.; Papiol, Vanesa ; Cartes, Joan Enric ; Sánchez, Francisco; Serrano, Alberto
KeywordsNezumia aequalis
Bay of Biscay
Prey availability
Deep sea
Feeding habits
Issue Date12-Apr-2012
CitationXIII International Symposium on Oceanography of the Bay of Biscay. ISOBAY 13. Book of abstracts: 118 (2012)
AbstractThe diet of the macrourid Nezumia aequalis is described for three areas located in the southern Bay of Biscay and characterised by different environmental conditions. Both Le Danois Bank and Aviles Canyon (Cantabrian Sea) displayed rich deep-sea benthic communities and highly productive waters, whereas Galicia Bank is characterised by poor benthic communities and more oligotrophic waters. Data come from surveys performed in 2004, 2009, 2010 and 2011 between 400 and 1200 m. Differences in size distribution were found for the three areas. In Le Danois Bank and Aviles canyon, specimens of N. aequalis were higher than that found in Galicia Bank. We examined stomach contents of 88 specimens of all sizes and identified prey to species level and quantified in number. Diet composition of the macrourid showed the relevance of epibenthic and suprabenthic organisms. In Le Danois Bank N. aequalis fed on a great variety of organisms being the polychaete Hyalinoecia tubicola and the amphipod Ampelisca spp. the most abundant ones. In the Avilés Canyon, suprabenthic peracarids were the main prey with the amphipods Laetmatophilus tuberculatus and Bonnierella abyssorum representing a high percentage of total prey. Calanoid copepods, ophiurids, gastropods and polychaetes represented, in Galicia Bank, more than 75 % of total diet. Significant differences were also found between trophic diversity (H‘n=3.29, H‘n=2.38 and H‘n=1.72 in Avilés Canyon, Le Danois Bank and Galicia Bank, respectively). The cluster analysis of prey affinities between hauls showed two major groups, one corresponding to Le Danois Bank and Avilés Canyon hauls, and the other corresponding to Galicia Bank hauls. All results revealed that feeding ecology of the macrourid was highly influenced by prey availability, environmental conditions and different trophic pathways of the three study areas
DescriptionXIII International Symposium on Oceanography of the Bay of Biscay. ISOBAY 13, 11-13 April 2012, Santander, Spain
Publisher version (URL)http://www.ieo-santander.net/isobay13/program.php
Appears in Collections:(ICM) Comunicaciones congresos
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