“Porpicide” in California: Killing of harbor porpoises ( Phocoena phocoena ) by coastal bottlenose dolphins ( Tursiops truncatus )
Abstract Between 2007 and 2009, we witnessed three aggressive interactions between harbor porpoises and bottlenose dolphins in Monterey Bay, California. This is the first time such aggression has been documented in the Pacific, and the first time a harbor porpoise was collected immediately after wit...
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crwiley:10.1111/j.1748-7692.2011.00474.x 2024-04-28T08:36:15+00:00 “Porpicide” in California: Killing of harbor porpoises ( Phocoena phocoena ) by coastal bottlenose dolphins ( Tursiops truncatus ) Cotter, Mark P. Maldini, Daniela Jefferson, Thomas A. 2011 http://dx.doi.org/10.1111/j.1748-7692.2011.00474.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2011.00474.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2011.00474.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Marine Mammal Science volume 28, issue 1 ISSN 0824-0469 1748-7692 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2011 crwiley https://doi.org/10.1111/j.1748-7692.2011.00474.x 2024-04-08T06:54:26Z Abstract Between 2007 and 2009, we witnessed three aggressive interactions between harbor porpoises and bottlenose dolphins in Monterey Bay, California. This is the first time such aggression has been documented in the Pacific, and the first time a harbor porpoise was collected immediately after witnessing its death, inflicted by bottlenose dolphins. Of the bottlenose dolphins present, 92% were males either confirmed (61%) or putative (31%). Since 2005, 44 harbor porpoise deaths inflicted by bottlenose dolphins were documented in California. Aberrant behavior was rejected as a cause of aggression, based on widespread documentation of similar behaviors in other populations of free‐ranging bottlenose dolphins. The evidence for interspecies territoriality as a form of competition for prey was weak: there is little dietary overlap and there are differences in bottlenose dolphin and harbor porpoise distribution patterns in California. Object‐oriented play was plausible as a form of practice to maintain intraspecific infanticidal skills or a form of play to maintain fighting skills between male associates. Contributing factors could be high‐testosterone levels, as attacks occurred at the height of the breeding season, and/or a skewed operational sex ratio. Ultimately, we need more information about bottlenose dolphin social structure at the time of the aggression. Article in Journal/Newspaper Phocoena phocoena Wiley Online Library Marine Mammal Science 28 1 E1 E15 |
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English |
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Aquatic Science Ecology, Evolution, Behavior and Systematics |
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Aquatic Science Ecology, Evolution, Behavior and Systematics Cotter, Mark P. Maldini, Daniela Jefferson, Thomas A. “Porpicide” in California: Killing of harbor porpoises ( Phocoena phocoena ) by coastal bottlenose dolphins ( Tursiops truncatus ) |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Abstract Between 2007 and 2009, we witnessed three aggressive interactions between harbor porpoises and bottlenose dolphins in Monterey Bay, California. This is the first time such aggression has been documented in the Pacific, and the first time a harbor porpoise was collected immediately after witnessing its death, inflicted by bottlenose dolphins. Of the bottlenose dolphins present, 92% were males either confirmed (61%) or putative (31%). Since 2005, 44 harbor porpoise deaths inflicted by bottlenose dolphins were documented in California. Aberrant behavior was rejected as a cause of aggression, based on widespread documentation of similar behaviors in other populations of free‐ranging bottlenose dolphins. The evidence for interspecies territoriality as a form of competition for prey was weak: there is little dietary overlap and there are differences in bottlenose dolphin and harbor porpoise distribution patterns in California. Object‐oriented play was plausible as a form of practice to maintain intraspecific infanticidal skills or a form of play to maintain fighting skills between male associates. Contributing factors could be high‐testosterone levels, as attacks occurred at the height of the breeding season, and/or a skewed operational sex ratio. Ultimately, we need more information about bottlenose dolphin social structure at the time of the aggression. |
format |
Article in Journal/Newspaper |
author |
Cotter, Mark P. Maldini, Daniela Jefferson, Thomas A. |
author_facet |
Cotter, Mark P. Maldini, Daniela Jefferson, Thomas A. |
author_sort |
Cotter, Mark P. |
title |
“Porpicide” in California: Killing of harbor porpoises ( Phocoena phocoena ) by coastal bottlenose dolphins ( Tursiops truncatus ) |
title_short |
“Porpicide” in California: Killing of harbor porpoises ( Phocoena phocoena ) by coastal bottlenose dolphins ( Tursiops truncatus ) |
title_full |
“Porpicide” in California: Killing of harbor porpoises ( Phocoena phocoena ) by coastal bottlenose dolphins ( Tursiops truncatus ) |
title_fullStr |
“Porpicide” in California: Killing of harbor porpoises ( Phocoena phocoena ) by coastal bottlenose dolphins ( Tursiops truncatus ) |
title_full_unstemmed |
“Porpicide” in California: Killing of harbor porpoises ( Phocoena phocoena ) by coastal bottlenose dolphins ( Tursiops truncatus ) |
title_sort |
“porpicide” in california: killing of harbor porpoises ( phocoena phocoena ) by coastal bottlenose dolphins ( tursiops truncatus ) |
publisher |
Wiley |
publishDate |
2011 |
url |
http://dx.doi.org/10.1111/j.1748-7692.2011.00474.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2011.00474.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2011.00474.x |
genre |
Phocoena phocoena |
genre_facet |
Phocoena phocoena |
op_source |
Marine Mammal Science volume 28, issue 1 ISSN 0824-0469 1748-7692 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1748-7692.2011.00474.x |
container_title |
Marine Mammal Science |
container_volume |
28 |
container_issue |
1 |
container_start_page |
E1 |
op_container_end_page |
E15 |
_version_ |
1797568095597887488 |