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Titel |
Ecological niches of three teuthophageous odontocetes in the northwestern Mediterranean Sea |
VerfasserIn |
E. Praca, A. Gannier |
Medientyp |
Artikel
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Sprache |
Englisch
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ISSN |
1812-0784
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Digitales Dokument |
URL |
Erschienen |
In: Ocean Science ; 4, no. 1 ; Nr. 4, no. 1 (2008-02-07), S.49-59 |
Datensatznummer |
250001533
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Publikation (Nr.) |
copernicus.org/os-4-49-2008.pdf |
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Zusammenfassung |
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 Provençal basin.
Therefore, potential competition for food between these species may be
reduced by the differentiation of their habitats. |
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