Fuzzy diel patterns in catchability of deep-water species on the continental margin
8 páginas, 4 tablas, 2 figuras.
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| Main Authors: | , , |
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| Format: | artículo biblioteca |
| Language: | English |
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Oxford University Press
2009
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| Subjects: | Mediterranean Sea, Multispecies fishery, Bottom trawl catches, Catch assessment surveys, Fuzzy clustering, Hierarchical clustering, |
| Online Access: | http://hdl.handle.net/10261/56866 |
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dig-icm-es-10261-568662019-03-26T10:40:52Z Fuzzy diel patterns in catchability of deep-water species on the continental margin Bahamon, Nixon Sardà, Francisco Aguzzi, Jacopo Mediterranean Sea Multispecies fishery Bottom trawl catches Catch assessment surveys Fuzzy clustering Hierarchical clustering 8 páginas, 4 tablas, 2 figuras. Exploited deep-water fish communities on continental margins are poorly understood in terms of variations in species composition and abundance by depth and season as a response to diel changes in light intensity and length of photoperiod. Innovative fuzzy clustering and traditional agglomerative hierarchical clustering methods were applied to data from bottom trawls collected continuously for 4 d in October and June, on the shelf (100–110 m) and upper slope (400–430 m). Fuzzy clustering was more effective than hierarchical clustering at characterizing diel variations in catches from the upper slope because the species assemblage did not show a distinct day and night structure. On the shelf, the species assemblages shifted abruptly between a diurnal and a nocturnal structure at sunset and sunrise, and the two clustering methods yielded similar results. Endobenthic decapods with marked crepuscular-nocturnal emergence from the substratum were mostly responsible for this pattern. No clearly discernible diel pattern was found with the dampening of light intensity with depth, weakening the behavioural response of endobenthos to the day–night cycle. The results indicated that the regulatory effect of the light cycle on diel activity rhythms weakens with depth. Data were taken from the NERIT cruise series (MAR98/935-CICYT). NB was partially supported by the EU NECESSITY project, contract 501605 (2004), and JA is a Postdoctoral Fellow within the “Juan de La Cierva” Scheme (MEC). Peer reviewed 2012-09-27T11:27:17Z 2012-09-27T11:27:17Z 2009 artículo http://purl.org/coar/resource_type/c_6501 ICES Journal of Marine Science 66 : 2211-2218 (2009) 1054-3139 http://hdl.handle.net/10261/56866 10.1093/icesjms/fsp190 1095-9289 en http://dx.doi.org/10.1093/icesjms/fsp190 none Oxford University Press |
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ES |
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Europa del Sur |
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| language |
English |
| topic |
Mediterranean Sea Multispecies fishery Bottom trawl catches Catch assessment surveys Fuzzy clustering Hierarchical clustering Mediterranean Sea Multispecies fishery Bottom trawl catches Catch assessment surveys Fuzzy clustering Hierarchical clustering |
| spellingShingle |
Mediterranean Sea Multispecies fishery Bottom trawl catches Catch assessment surveys Fuzzy clustering Hierarchical clustering Mediterranean Sea Multispecies fishery Bottom trawl catches Catch assessment surveys Fuzzy clustering Hierarchical clustering Bahamon, Nixon Sardà, Francisco Aguzzi, Jacopo Fuzzy diel patterns in catchability of deep-water species on the continental margin |
| description |
8 páginas, 4 tablas, 2 figuras. |
| format |
artículo |
| topic_facet |
Mediterranean Sea Multispecies fishery Bottom trawl catches Catch assessment surveys Fuzzy clustering Hierarchical clustering |
| author |
Bahamon, Nixon Sardà, Francisco Aguzzi, Jacopo |
| author_facet |
Bahamon, Nixon Sardà, Francisco Aguzzi, Jacopo |
| author_sort |
Bahamon, Nixon |
| title |
Fuzzy diel patterns in catchability of deep-water species on the continental margin |
| title_short |
Fuzzy diel patterns in catchability of deep-water species on the continental margin |
| title_full |
Fuzzy diel patterns in catchability of deep-water species on the continental margin |
| title_fullStr |
Fuzzy diel patterns in catchability of deep-water species on the continental margin |
| title_full_unstemmed |
Fuzzy diel patterns in catchability of deep-water species on the continental margin |
| title_sort |
fuzzy diel patterns in catchability of deep-water species on the continental margin |
| publisher |
Oxford University Press |
| publishDate |
2009 |
| url |
http://hdl.handle.net/10261/56866 |
| work_keys_str_mv |
AT bahamonnixon fuzzydielpatternsincatchabilityofdeepwaterspeciesonthecontinentalmargin AT sardafrancisco fuzzydielpatternsincatchabilityofdeepwaterspeciesonthecontinentalmargin AT aguzzijacopo fuzzydielpatternsincatchabilityofdeepwaterspeciesonthecontinentalmargin |
| _version_ |
1777665865053896704 |