Ecological niches of three teuthophageous odontocetes in the northwestern Mediterranean Sea
In the northwestern Mediterranean Sea, sperm whales, pilot whales and Risso's dolphins prey exclusively or preferentially on cephalopods. In order to evaluate their competition, we modelled their habitat suitability with the Ecological Niche Factor Analysis (ENFA) and compared their ecological...
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ftvliz:oai:oma.vliz.be:211420 2023-05-15T18:26:37+02:00 Ecological niches of three teuthophageous odontocetes in the northwestern Mediterranean Sea Praca, E. Gannier, A. 2008 application/pdf https://www.vliz.be/imisdocs/publications/231424.pdf en eng info:eu-repo/semantics/altIdentifier/wos/000253566700004 https://www.vliz.be/imisdocs/publications/231424.pdf info:eu-repo/semantics/openAccess iOcean+Sci.+41i+49-59 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2008 ftvliz 2022-05-01T09:40:42Z In the northwestern Mediterranean Sea, sperm whales, pilot whales and Risso's dolphins prey exclusively or preferentially on cephalopods. In order to evaluate their competition, we modelled their habitat suitability with the Ecological Niche Factor Analysis (ENFA) and compared their ecological niches using a discriminant analysis. We used a long term (1995-2005) small boat data set, with visual and acoustic (sperm whale) detections. Risso's dolphin had the shallowest and the more spatially restricted principal habitat, mainly located on the upper part of the continental slope (640 m mean depth). With a wider principal habitat, at 1750 m depth in average, the sperm whale used a deeper part of the slope as well as the closest offshore waters. Finally, the pilot whale has the most oceanic habitat (2500 m mean depth) mainly located in the central Ligurian Sea and Provencal basin. Therefore, potential competition for food between these species may be reduced by the differentiation of their habitats. Article in Journal/Newspaper Sperm whale Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) |
institution |
Open Polar |
collection |
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA) |
op_collection_id |
ftvliz |
language |
English |
description |
In the northwestern Mediterranean Sea, sperm whales, pilot whales and Risso's dolphins prey exclusively or preferentially on cephalopods. In order to evaluate their competition, we modelled their habitat suitability with the Ecological Niche Factor Analysis (ENFA) and compared their ecological niches using a discriminant analysis. We used a long term (1995-2005) small boat data set, with visual and acoustic (sperm whale) detections. Risso's dolphin had the shallowest and the more spatially restricted principal habitat, mainly located on the upper part of the continental slope (640 m mean depth). With a wider principal habitat, at 1750 m depth in average, the sperm whale used a deeper part of the slope as well as the closest offshore waters. Finally, the pilot whale has the most oceanic habitat (2500 m mean depth) mainly located in the central Ligurian Sea and Provencal basin. Therefore, potential competition for food between these species may be reduced by the differentiation of their habitats. |
format |
Article in Journal/Newspaper |
author |
Praca, E. Gannier, A. |
spellingShingle |
Praca, E. Gannier, A. Ecological niches of three teuthophageous odontocetes in the northwestern Mediterranean Sea |
author_facet |
Praca, E. Gannier, A. |
author_sort |
Praca, E. |
title |
Ecological niches of three teuthophageous odontocetes in the northwestern Mediterranean Sea |
title_short |
Ecological niches of three teuthophageous odontocetes in the northwestern Mediterranean Sea |
title_full |
Ecological niches of three teuthophageous odontocetes in the northwestern Mediterranean Sea |
title_fullStr |
Ecological niches of three teuthophageous odontocetes in the northwestern Mediterranean Sea |
title_full_unstemmed |
Ecological niches of three teuthophageous odontocetes in the northwestern Mediterranean Sea |
title_sort |
ecological niches of three teuthophageous odontocetes in the northwestern mediterranean sea |
publishDate |
2008 |
url |
https://www.vliz.be/imisdocs/publications/231424.pdf |
genre |
Sperm whale |
genre_facet |
Sperm whale |
op_source |
iOcean+Sci.+41i+49-59 |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/000253566700004 https://www.vliz.be/imisdocs/publications/231424.pdf |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766208591522430976 |