Evolution of group size in the dolphins and porpoises: interspecific consistency of intraspecific patterns
I investigated group size variability in dolphins and porpoises using intraspecific comparisons. Explanatory factors considered in the analysis were variables of the physical environment, the diet, and the life history of the species. Open habitat and small body size were viewed as increasing predat...
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Oxford University Press
2002
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ftunivzuerich:oai:www.zora.uzh.ch:154656 2024-06-23T07:55:59+00:00 Evolution of group size in the dolphins and porpoises: interspecific consistency of intraspecific patterns Gygax, L 2002-09-01 application/pdf https://www.zora.uzh.ch/id/eprint/154656/ https://www.zora.uzh.ch/id/eprint/154656/1/ZORA_NL_154656.pdf https://doi.org/10.5167/uzh-154656 https://doi.org/10.1093/beheco/13.5.583 eng eng Oxford University Press https://www.zora.uzh.ch/id/eprint/154656/1/ZORA_NL_154656.pdf doi:10.5167/uzh-154656 doi:10.1093/beheco/13.5.583 urn:issn:1045-2249 info:eu-repo/semantics/openAccess Gygax, L (2002). Evolution of group size in the dolphins and porpoises: interspecific consistency of intraspecific patterns. Behavioral Ecology, 13(5):583-590. 142-005 000 Computer science knowledge & systems 570 Life sciences biology 590 Animals (Zoology) Journal Article PeerReviewed info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2002 ftunivzuerich https://doi.org/10.5167/uzh-15465610.1093/beheco/13.5.583 2024-05-29T00:48:49Z I investigated group size variability in dolphins and porpoises using intraspecific comparisons. Explanatory factors considered in the analysis were variables of the physical environment, the diet, and the life history of the species. Open habitat and small body size were viewed as increasing predation risk. This pattern was apparent in Risso's dolphins (Grampus griseus) and weakly apparent in bottlenose dolphins (Tursiops spp.). Group size was negatively correlated with body size in pilot whales (Globicephala spp.) and positively correlated with the openness of habitat in killer whales (Orcinus orca), striped dolphins (Stenella coeruleoalba), and common dolphins (Delphinus spp.). No such relationship was found for harbor and Dall's porpoises (Phocoena phocoena, P. dalli). Group size also seemed to vary depending on other physical measures of the habitat, which may indirectly reflect diet; group size showed U-shaped patterns if related to temperature. The predictive power of variables comprising detailed prey information on group size was variable. For example, pilot whales had smaller group sizes when they fed more on mesopelagic fish and less on mesopelagic cephalopods, and common dolphins had larger groups if they fed on varying types of fish. In most Delphinoidea species, group size could be described by the variables considered in this study. But each species showed its own pattern of correlations between group size and a specific set of explanatory variables. Thus, no general and consistent relation between group size and the other variables was found. It remains unknown whether these species-specific patterns result from a historical process or whether they are specialized adaptations Article in Journal/Newspaper Orca Orcinus orca Phocoena phocoena University of Zurich (UZH): ZORA (Zurich Open Repository and Archive |
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Open Polar |
collection |
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive |
op_collection_id |
ftunivzuerich |
language |
English |
topic |
142-005 000 Computer science knowledge & systems 570 Life sciences biology 590 Animals (Zoology) |
spellingShingle |
142-005 000 Computer science knowledge & systems 570 Life sciences biology 590 Animals (Zoology) Gygax, L Evolution of group size in the dolphins and porpoises: interspecific consistency of intraspecific patterns |
topic_facet |
142-005 000 Computer science knowledge & systems 570 Life sciences biology 590 Animals (Zoology) |
description |
I investigated group size variability in dolphins and porpoises using intraspecific comparisons. Explanatory factors considered in the analysis were variables of the physical environment, the diet, and the life history of the species. Open habitat and small body size were viewed as increasing predation risk. This pattern was apparent in Risso's dolphins (Grampus griseus) and weakly apparent in bottlenose dolphins (Tursiops spp.). Group size was negatively correlated with body size in pilot whales (Globicephala spp.) and positively correlated with the openness of habitat in killer whales (Orcinus orca), striped dolphins (Stenella coeruleoalba), and common dolphins (Delphinus spp.). No such relationship was found for harbor and Dall's porpoises (Phocoena phocoena, P. dalli). Group size also seemed to vary depending on other physical measures of the habitat, which may indirectly reflect diet; group size showed U-shaped patterns if related to temperature. The predictive power of variables comprising detailed prey information on group size was variable. For example, pilot whales had smaller group sizes when they fed more on mesopelagic fish and less on mesopelagic cephalopods, and common dolphins had larger groups if they fed on varying types of fish. In most Delphinoidea species, group size could be described by the variables considered in this study. But each species showed its own pattern of correlations between group size and a specific set of explanatory variables. Thus, no general and consistent relation between group size and the other variables was found. It remains unknown whether these species-specific patterns result from a historical process or whether they are specialized adaptations |
format |
Article in Journal/Newspaper |
author |
Gygax, L |
author_facet |
Gygax, L |
author_sort |
Gygax, L |
title |
Evolution of group size in the dolphins and porpoises: interspecific consistency of intraspecific patterns |
title_short |
Evolution of group size in the dolphins and porpoises: interspecific consistency of intraspecific patterns |
title_full |
Evolution of group size in the dolphins and porpoises: interspecific consistency of intraspecific patterns |
title_fullStr |
Evolution of group size in the dolphins and porpoises: interspecific consistency of intraspecific patterns |
title_full_unstemmed |
Evolution of group size in the dolphins and porpoises: interspecific consistency of intraspecific patterns |
title_sort |
evolution of group size in the dolphins and porpoises: interspecific consistency of intraspecific patterns |
publisher |
Oxford University Press |
publishDate |
2002 |
url |
https://www.zora.uzh.ch/id/eprint/154656/ https://www.zora.uzh.ch/id/eprint/154656/1/ZORA_NL_154656.pdf https://doi.org/10.5167/uzh-154656 https://doi.org/10.1093/beheco/13.5.583 |
genre |
Orca Orcinus orca Phocoena phocoena |
genre_facet |
Orca Orcinus orca Phocoena phocoena |
op_source |
Gygax, L (2002). Evolution of group size in the dolphins and porpoises: interspecific consistency of intraspecific patterns. Behavioral Ecology, 13(5):583-590. |
op_relation |
https://www.zora.uzh.ch/id/eprint/154656/1/ZORA_NL_154656.pdf doi:10.5167/uzh-154656 doi:10.1093/beheco/13.5.583 urn:issn:1045-2249 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5167/uzh-15465610.1093/beheco/13.5.583 |
_version_ |
1802648811288395776 |