NDLI: Mark-resight estimates of seasonal variation in harbor seal abundance and site fidelity

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Mark-resight estimates of seasonal variation in harbor seal abundance and site fidelity

Content Provider	Springer Nature Link
Author	Cordes, Line S. Thompson, Paul M.
Copyright Year	2015
Abstract	Monitoring trends in abundance of pinnipeds typically involves counting seals at terrestrial haul-out sites during the breeding season. Counts of seals made at other times of the year are typically lower; however, it is often unknown whether this is because fewer animals are present or whether lower counts simply reflect a reduction in haul-out probability. Here we illustrate how photo-identification data from an individual-based study of harbor seals (Phoca vitulina) can be used to estimate seasonal variation in abundance and site fidelity. Monthly data collected over a two-year period were analyzed using a mark-recapture mark-resight model accounting for individuals transitioning between observable and unobservable states. Levels of site fidelity were high throughout the year and abundance estimates showed no seasonal pattern. This suggests that individual seals used haul-out sites to the same extent throughout the year, and that peaks in counts during the breeding season are a result of seasonal changes in haul-out probability. The results of this study have implications for understanding population sub-structuring, gene flow and disease spread.
Starting Page	467
Ending Page	472
Page Count	6
File Format	PDF
ISSN	14383896
Journal	Population Ecology
Volume Number	57
Issue Number	3
e-ISSN	1438390X
Language	English
Publisher	Springer Japan
Publisher Date	2015-06-09
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Haul-out probability Individual-based Mark-recapture Phoca vitulina Photo-identification Population dynamics Ecology Zoology Plant Sciences Evolutionary Biology Behavioral Sciences Forestry
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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The seasonal movements and abundance dynamics of the Pacific harbor seal (Phoca vitulina richardsi) along the southern Oregon coast

Haul out patterns and diet of harbor seals, Phoca vitulina, in Coos County, Oregon

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Seasonal, meteorological, tidal and diurnal effects on haul-out patterns of harbour seals (Phoca vitulina) in Iceland

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Aerial visual acuity in harbor seals (Phoca vitulina) as a function of luminance

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