Haul-Out Selection by Pacific Harbor Seals (phoca Vitulina Richardii): Isolation and Perceived Predation Risk. Nordstrom, C. A. Marine Mammal Science, 18(1):194–205, January, 2002. ![Haul-Out Selection by Pacific Harbor Seals (phoca Vitulina Richardii): Isolation and Perceived Predation Risk [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex 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{nordstrom_haul-out_2002,
title = {Haul-{Out} {Selection} by {Pacific} {Harbor} {Seals} (phoca {Vitulina} {Richardii}): {Isolation} and {Perceived} {Predation} {Risk}},
volume = {18},
issn = {1748-7692},
shorttitle = {Haul-{Out} {Selection} by {Pacific} {Harbor} {Seals} (phoca {Vitulina} {Richardii})},
url = {http://onlinelibrary.wiley.com/doi/10.1111/j.1748-7692.2002.tb01028.x/abstract},
doi = {10.1111/j.1748-7692.2002.tb01028.x},
abstract = {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.},
language = {en},
number = {1},
urldate = {2015-08-13},
journal = {Marine Mammal Science},
author = {Nordstrom, Chad A.},
month = jan,
year = {2002},
keywords = {Phoca vitulina richardii},
pages = {194--205},
}
Downloads: 0
{"_id":"RC75DHfDC3EZBTQih","bibbaseid":"nordstrom-hauloutselectionbypacificharborsealsphocavitulinarichardiiisolationandperceivedpredationrisk-2002","downloads":0,"creationDate":"2015-08-24T17:48:39.770Z","title":"Haul-Out Selection by Pacific Harbor Seals (phoca Vitulina Richardii): Isolation and Perceived Predation Risk","author_short":["Nordstrom, C. A."],"year":2002,"bibtype":"article","biburl":"http://bibbase.org/zotero/BMSC","bibdata":{"bibtype":"article","type":"article","title":"Haul-Out Selection by Pacific Harbor Seals (phoca Vitulina Richardii): Isolation and Perceived Predation Risk","volume":"18","issn":"1748-7692","shorttitle":"Haul-Out Selection by Pacific Harbor Seals (phoca Vitulina Richardii)","url":"http://onlinelibrary.wiley.com/doi/10.1111/j.1748-7692.2002.tb01028.x/abstract","doi":"10.1111/j.1748-7692.2002.tb01028.x","abstract":"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.","language":"en","number":"1","urldate":"2015-08-13","journal":"Marine Mammal Science","author":[{"propositions":[],"lastnames":["Nordstrom"],"firstnames":["Chad","A."],"suffixes":[]}],"month":"January","year":"2002","keywords":"Phoca vitulina richardii","pages":"194–205","bibtex":"@article{nordstrom_haul-out_2002,\n\ttitle = {Haul-{Out} {Selection} by {Pacific} {Harbor} {Seals} (phoca {Vitulina} {Richardii}): {Isolation} and {Perceived} {Predation} {Risk}},\n\tvolume = {18},\n\tissn = {1748-7692},\n\tshorttitle = {Haul-{Out} {Selection} by {Pacific} {Harbor} {Seals} (phoca {Vitulina} {Richardii})},\n\turl = {http://onlinelibrary.wiley.com/doi/10.1111/j.1748-7692.2002.tb01028.x/abstract},\n\tdoi = {10.1111/j.1748-7692.2002.tb01028.x},\n\tabstract = {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.},\n\tlanguage = {en},\n\tnumber = {1},\n\turldate = {2015-08-13},\n\tjournal = {Marine Mammal Science},\n\tauthor = {Nordstrom, Chad A.},\n\tmonth = jan,\n\tyear = {2002},\n\tkeywords = {Phoca vitulina richardii},\n\tpages = {194--205},\n}\n\n\n\n","author_short":["Nordstrom, C. A."],"key":"nordstrom_haul-out_2002","id":"nordstrom_haul-out_2002","bibbaseid":"nordstrom-hauloutselectionbypacificharborsealsphocavitulinarichardiiisolationandperceivedpredationrisk-2002","role":"author","urls":{"Paper":"http://onlinelibrary.wiley.com/doi/10.1111/j.1748-7692.2002.tb01028.x/abstract"},"keyword":["Phoca vitulina richardii"],"metadata":{"authorlinks":{}},"downloads":0,"html":""},"search_terms":["haul","out","selection","pacific","harbor","seals","phoca","vitulina","richardii","isolation","perceived","predation","risk","nordstrom"],"keywords":["phoca vitulina richardii"],"authorIDs":[],"dataSources":["cojDQSsxW9McYnKzu","5xMNsBjXAchdDg3cd"]}