Comparison of the summer habitat of four preferential teuthophagous cetaceans in north-western Mediterranean Sea
International audience More than 50 squid species inhabit the Mediterranean Sea and four of the common cetacean species are preferential squid eaters. This suggests that teuthophagous cetaceans might be in competition for food and suitable habitats. Descriptive and multivariate analyses were carried...
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ftccsdartic:oai:HAL:hal-03532608v1 2023-08-15T12:43:09+02:00 Comparison of the summer habitat of four preferential teuthophagous cetaceans in north-western Mediterranean Sea Comparaison de l’habitat estival de quatre cétacés teuthophages préférentiels en Méditerranée nord-occidentale Gannier, Alexandre 2018 https://hal.science/hal-03532608 https://hal.science/hal-03532608/document https://hal.science/hal-03532608/file/bitstream_130072.pdf fr fre HAL CCSD Société nationale de protection de la nature (SNPN) hal-03532608 https://hal.science/hal-03532608 https://hal.science/hal-03532608/document https://hal.science/hal-03532608/file/bitstream_130072.pdf info:eu-repo/semantics/OpenAccess ISSN: 0249-7395 EISSN: 2429-6422 Revue d'Écologie https://hal.science/hal-03532608 Revue d'Écologie, 2018, 73 (4), pp.582-602 [SDE.BE]Environmental Sciences/Biodiversity and Ecology info:eu-repo/semantics/article Journal articles 2018 ftccsdartic 2023-07-22T23:07:31Z International audience More than 50 squid species inhabit the Mediterranean Sea and four of the common cetacean species are preferential squid eaters. This suggests that teuthophagous cetaceans might be in competition for food and suitable habitats. Descriptive and multivariate analyses were carried out from long term dedicated survey data (1988-2012) in the north-western Mediterranean, including the northern Tyrrhenian Sea. A total of 298 on-effort sightings were obtained between 1988 and 2012, including 202 on effective effort: 157 observations of Sperm whale, 39 of Cuvier's beaked whale, 49 of Long-finned pilot whale and 53 of Risso's dolphin. Five environmental variables (depth, slope, distance-to-200m-isobath (D200), monthly chlorophyll concentration and SST) were defined for every 3x3 km cell in the western basin, as well as summer sighting rates using Pennington estimators for each individual species. Based on Kruskal-Wallis test, the observed habitats were not homogeneous for all species, excepted for SST: preferred depth was significantly distinct for each species. D200 was also distinct, with the exception of the pair Cuvier's beaked whale/pilot whale. Based on a discriminant analysis (stepwise ascending mode), four variables contributed significantly (Wilk's lambda = 0.49) to habitat description of the four species, the most important of them being the depth. Discriminant function was highly efficient to classify Cuvier's beaked whale and pilot whale habitats (respectively 84.6 % and 83.7 % success rate), but sperm whale was poorly discriminated from other species (29.6 % correct prediction). Cuvier's beaked whale and pilot whale habitats were well separated, when those of sperm whale and Risso's dolphin largely overlapped. From available results from different regions worldwide, it seems that Risso's dolphins and pilot whales are rarely abundant together in a given area, which raises the question of a possible competition between these teuthophagous delphinids. Based on published literature, these ... Article in Journal/Newspaper Sperm whale Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Lambda ENVELOPE(-62.983,-62.983,-64.300,-64.300) Pennington ENVELOPE(-134.904,-134.904,59.983,59.983) Western Basin |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
French |
topic |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology |
spellingShingle |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology Gannier, Alexandre Comparison of the summer habitat of four preferential teuthophagous cetaceans in north-western Mediterranean Sea |
topic_facet |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology |
description |
International audience More than 50 squid species inhabit the Mediterranean Sea and four of the common cetacean species are preferential squid eaters. This suggests that teuthophagous cetaceans might be in competition for food and suitable habitats. Descriptive and multivariate analyses were carried out from long term dedicated survey data (1988-2012) in the north-western Mediterranean, including the northern Tyrrhenian Sea. A total of 298 on-effort sightings were obtained between 1988 and 2012, including 202 on effective effort: 157 observations of Sperm whale, 39 of Cuvier's beaked whale, 49 of Long-finned pilot whale and 53 of Risso's dolphin. Five environmental variables (depth, slope, distance-to-200m-isobath (D200), monthly chlorophyll concentration and SST) were defined for every 3x3 km cell in the western basin, as well as summer sighting rates using Pennington estimators for each individual species. Based on Kruskal-Wallis test, the observed habitats were not homogeneous for all species, excepted for SST: preferred depth was significantly distinct for each species. D200 was also distinct, with the exception of the pair Cuvier's beaked whale/pilot whale. Based on a discriminant analysis (stepwise ascending mode), four variables contributed significantly (Wilk's lambda = 0.49) to habitat description of the four species, the most important of them being the depth. Discriminant function was highly efficient to classify Cuvier's beaked whale and pilot whale habitats (respectively 84.6 % and 83.7 % success rate), but sperm whale was poorly discriminated from other species (29.6 % correct prediction). Cuvier's beaked whale and pilot whale habitats were well separated, when those of sperm whale and Risso's dolphin largely overlapped. From available results from different regions worldwide, it seems that Risso's dolphins and pilot whales are rarely abundant together in a given area, which raises the question of a possible competition between these teuthophagous delphinids. Based on published literature, these ... |
format |
Article in Journal/Newspaper |
author |
Gannier, Alexandre |
author_facet |
Gannier, Alexandre |
author_sort |
Gannier, Alexandre |
title |
Comparison of the summer habitat of four preferential teuthophagous cetaceans in north-western Mediterranean Sea |
title_short |
Comparison of the summer habitat of four preferential teuthophagous cetaceans in north-western Mediterranean Sea |
title_full |
Comparison of the summer habitat of four preferential teuthophagous cetaceans in north-western Mediterranean Sea |
title_fullStr |
Comparison of the summer habitat of four preferential teuthophagous cetaceans in north-western Mediterranean Sea |
title_full_unstemmed |
Comparison of the summer habitat of four preferential teuthophagous cetaceans in north-western Mediterranean Sea |
title_sort |
comparison of the summer habitat of four preferential teuthophagous cetaceans in north-western mediterranean sea |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.science/hal-03532608 https://hal.science/hal-03532608/document https://hal.science/hal-03532608/file/bitstream_130072.pdf |
long_lat |
ENVELOPE(-62.983,-62.983,-64.300,-64.300) ENVELOPE(-134.904,-134.904,59.983,59.983) |
geographic |
Lambda Pennington Western Basin |
geographic_facet |
Lambda Pennington Western Basin |
genre |
Sperm whale |
genre_facet |
Sperm whale |
op_source |
ISSN: 0249-7395 EISSN: 2429-6422 Revue d'Écologie https://hal.science/hal-03532608 Revue d'Écologie, 2018, 73 (4), pp.582-602 |
op_relation |
hal-03532608 https://hal.science/hal-03532608 https://hal.science/hal-03532608/document https://hal.science/hal-03532608/file/bitstream_130072.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1774298976417218560 |