Social and Behavioural Factors in Cetacean Responses to Overexploitation: Are Odontocetes Less "Resilient" Than Mysticetes?
Many severely depleted populations of baleen whales (Mysticeti) have exhibited clear signs of recovery whereas there are few examples in toothed whales (Odontoceti). We hypothesize that this difference is due, at least in part, to social and behavioural factors. Clearly, a part of the lack of resili...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1079.4904 2023-05-15T15:37:10+02:00 Social and Behavioural Factors in Cetacean Responses to Overexploitation: Are Odontocetes Less "Resilient" Than Mysticetes? Paul R Wade Randall R Reeves Sarah L Mesnick The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1079.4904 http://downloads.hindawi.com/journals/jmb/2012/567276.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1079.4904 http://downloads.hindawi.com/journals/jmb/2012/567276.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://downloads.hindawi.com/journals/jmb/2012/567276.pdf text ftciteseerx 2020-05-03T00:20:26Z Many severely depleted populations of baleen whales (Mysticeti) have exhibited clear signs of recovery whereas there are few examples in toothed whales (Odontoceti). We hypothesize that this difference is due, at least in part, to social and behavioural factors. Clearly, a part of the lack of resilience to exploitation is explained by odontocete life history. However, an additional factor may be the highly social nature of many odontocetes in which survival and reproductive success may depend on: (a) social cohesion and organization, (b) mutual defence against predators and possible alloparental care, (c) inter-generational transfer of "knowledge", and (d) leadership by older individuals. We found little evidence of strong recovery in any of the depleted populations examined. Their relatively low potential rates of increase mean that odontocete populations can be over-exploited with take rates of only a few percent per year. Exploitation can have effects beyond the dynamics of individual removals. Four species showed evidence of a decrease in birth rates following exploitation; potential mechanisms include a deficit of adult females, a deficit of adult males, and disruption of mating systems. The evidence for a lack of strong recovery in heavily exploited odontocete populations indicates that management should be more precautionary. Text baleen whales toothed whales Unknown |
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description |
Many severely depleted populations of baleen whales (Mysticeti) have exhibited clear signs of recovery whereas there are few examples in toothed whales (Odontoceti). We hypothesize that this difference is due, at least in part, to social and behavioural factors. Clearly, a part of the lack of resilience to exploitation is explained by odontocete life history. However, an additional factor may be the highly social nature of many odontocetes in which survival and reproductive success may depend on: (a) social cohesion and organization, (b) mutual defence against predators and possible alloparental care, (c) inter-generational transfer of "knowledge", and (d) leadership by older individuals. We found little evidence of strong recovery in any of the depleted populations examined. Their relatively low potential rates of increase mean that odontocete populations can be over-exploited with take rates of only a few percent per year. Exploitation can have effects beyond the dynamics of individual removals. Four species showed evidence of a decrease in birth rates following exploitation; potential mechanisms include a deficit of adult females, a deficit of adult males, and disruption of mating systems. The evidence for a lack of strong recovery in heavily exploited odontocete populations indicates that management should be more precautionary. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Paul R Wade Randall R Reeves Sarah L Mesnick |
spellingShingle |
Paul R Wade Randall R Reeves Sarah L Mesnick Social and Behavioural Factors in Cetacean Responses to Overexploitation: Are Odontocetes Less "Resilient" Than Mysticetes? |
author_facet |
Paul R Wade Randall R Reeves Sarah L Mesnick |
author_sort |
Paul R Wade |
title |
Social and Behavioural Factors in Cetacean Responses to Overexploitation: Are Odontocetes Less "Resilient" Than Mysticetes? |
title_short |
Social and Behavioural Factors in Cetacean Responses to Overexploitation: Are Odontocetes Less "Resilient" Than Mysticetes? |
title_full |
Social and Behavioural Factors in Cetacean Responses to Overexploitation: Are Odontocetes Less "Resilient" Than Mysticetes? |
title_fullStr |
Social and Behavioural Factors in Cetacean Responses to Overexploitation: Are Odontocetes Less "Resilient" Than Mysticetes? |
title_full_unstemmed |
Social and Behavioural Factors in Cetacean Responses to Overexploitation: Are Odontocetes Less "Resilient" Than Mysticetes? |
title_sort |
social and behavioural factors in cetacean responses to overexploitation: are odontocetes less "resilient" than mysticetes? |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1079.4904 http://downloads.hindawi.com/journals/jmb/2012/567276.pdf |
genre |
baleen whales toothed whales |
genre_facet |
baleen whales toothed whales |
op_source |
http://downloads.hindawi.com/journals/jmb/2012/567276.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1079.4904 http://downloads.hindawi.com/journals/jmb/2012/567276.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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