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- Title
Ecological niches of three teuthophageous odontocetes in the northwestern Mediterranean Sea.
- Authors
Praca, E.; Gannier, A.
- Abstract
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 (640m mean depth). With a wider principal habitat, at 1750m 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 (2500m mean depth) mainly located in the central Ligurian Sea and Provençal basin. Therefore, potential competition for food between these species may be reduced by the differentiation of their habitats.
- Subjects
OCEANOGRAPHY; CEPHALOPODA; SPERM whale; GLOBICEPHALA melaena; GLOBICEPHALA macrorhynchus; RISSO'S dolphin; HABITATS; AQUATIC habitats; DISCRIMINANT analysis
- Publication
Ocean Science, 2008, Vol 4, Issue 1, p49
- ISSN
1812-0784
- Publication type
Article
- DOI
10.5194/os-4-49-2008