HAUL‐OUT SELECTION BY PACIFIC HARBOR SEALS ( PHOCA VITULINA RICHARDII): ISOLATION AND PERCEIVED PREDATION RISK
A bstract The potential for non‐aquatic predators to influence habitat use by harbor seals ( Phoca vitulina ) in a nearshore marine environment was studied by examining haul‐out site use and through an experimental approach. Distance from shore, distance to possible foraging depths, peripheral water...
Published in: | Marine Mammal Science |
---|---|
Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2002
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1111/j.1748-7692.2002.tb01028.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2002.tb01028.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2002.tb01028.x |
id |
crwiley:10.1111/j.1748-7692.2002.tb01028.x |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1111/j.1748-7692.2002.tb01028.x 2024-09-15T18:30:21+00:00 HAUL‐OUT SELECTION BY PACIFIC HARBOR SEALS ( PHOCA VITULINA RICHARDII): ISOLATION AND PERCEIVED PREDATION RISK Nordstrom, Chad A. 2002 http://dx.doi.org/10.1111/j.1748-7692.2002.tb01028.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2002.tb01028.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2002.tb01028.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Marine Mammal Science volume 18, issue 1, page 194-205 ISSN 0824-0469 1748-7692 journal-article 2002 crwiley https://doi.org/10.1111/j.1748-7692.2002.tb01028.x 2024-08-27T04:31:16Z A bstract The potential for non‐aquatic predators to influence habitat use by harbor seals ( Phoca vitulina ) in a nearshore marine environment was studied by examining haul‐out site use and through an experimental approach. Distance from shore, distance to possible foraging depths, peripheral water depth, and haul‐out areas were quantified for each haul‐out. There was a positive relationship between the number of seals hauled out and the distance from shore for eight known haul‐out sites. The hypothesis that harbor seals increasingly hauled out farther offshore to reduce predation risk was tested experimentally by measuring their response to a model of a potential terrestrial predator in comparison to a control object, and to disturbance by a human at one of the study sites. Harbor seals abandoned the haul‐out in the presence of the predator model, but showed little response to the controls, suggesting they possess a threat image for terrestrial predators and avoid hauling out when it is perceived. These results support the hypothesis that harbor seals select isolated sites to reduce exposure to terrestrial carnivores. Article in Journal/Newspaper Phoca vitulina Wiley Online Library Marine Mammal Science 18 1 194 205 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
A bstract The potential for non‐aquatic predators to influence habitat use by harbor seals ( Phoca vitulina ) in a nearshore marine environment was studied by examining haul‐out site use and through an experimental approach. Distance from shore, distance to possible foraging depths, peripheral water depth, and haul‐out areas were quantified for each haul‐out. There was a positive relationship between the number of seals hauled out and the distance from shore for eight known haul‐out sites. The hypothesis that harbor seals increasingly hauled out farther offshore to reduce predation risk was tested experimentally by measuring their response to a model of a potential terrestrial predator in comparison to a control object, and to disturbance by a human at one of the study sites. Harbor seals abandoned the haul‐out in the presence of the predator model, but showed little response to the controls, suggesting they possess a threat image for terrestrial predators and avoid hauling out when it is perceived. These results support the hypothesis that harbor seals select isolated sites to reduce exposure to terrestrial carnivores. |
format |
Article in Journal/Newspaper |
author |
Nordstrom, Chad A. |
spellingShingle |
Nordstrom, Chad A. HAUL‐OUT SELECTION BY PACIFIC HARBOR SEALS ( PHOCA VITULINA RICHARDII): ISOLATION AND PERCEIVED PREDATION RISK |
author_facet |
Nordstrom, Chad A. |
author_sort |
Nordstrom, Chad A. |
title |
HAUL‐OUT SELECTION BY PACIFIC HARBOR SEALS ( PHOCA VITULINA RICHARDII): ISOLATION AND PERCEIVED PREDATION RISK |
title_short |
HAUL‐OUT SELECTION BY PACIFIC HARBOR SEALS ( PHOCA VITULINA RICHARDII): ISOLATION AND PERCEIVED PREDATION RISK |
title_full |
HAUL‐OUT SELECTION BY PACIFIC HARBOR SEALS ( PHOCA VITULINA RICHARDII): ISOLATION AND PERCEIVED PREDATION RISK |
title_fullStr |
HAUL‐OUT SELECTION BY PACIFIC HARBOR SEALS ( PHOCA VITULINA RICHARDII): ISOLATION AND PERCEIVED PREDATION RISK |
title_full_unstemmed |
HAUL‐OUT SELECTION BY PACIFIC HARBOR SEALS ( PHOCA VITULINA RICHARDII): ISOLATION AND PERCEIVED PREDATION RISK |
title_sort |
haul‐out selection by pacific harbor seals ( phoca vitulina richardii): isolation and perceived predation risk |
publisher |
Wiley |
publishDate |
2002 |
url |
http://dx.doi.org/10.1111/j.1748-7692.2002.tb01028.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2002.tb01028.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2002.tb01028.x |
genre |
Phoca vitulina |
genre_facet |
Phoca vitulina |
op_source |
Marine Mammal Science volume 18, issue 1, page 194-205 ISSN 0824-0469 1748-7692 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1748-7692.2002.tb01028.x |
container_title |
Marine Mammal Science |
container_volume |
18 |
container_issue |
1 |
container_start_page |
194 |
op_container_end_page |
205 |
_version_ |
1810471826155896832 |