Six Years of Harbor Seal Censusing at Yaquina Estuary, Oregon

Bayer, Range D.

doi:10.2307/3533765

Cited by 5 publications

(3 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Other observations in glacial fjords point to an important role for social dynamics in this pattern, with breeding males supplanting juveniles in order to maintain underwater territories near nursing females (Hoover ). Harbor seals regularly show seasonal patterns in haul‐out abundance and habitat use though often with unexplained anomalies (Brown and Mate , Bayer , Rosenfeld et al . , Mathews and Kelly , Harris et al .…”

Section: Discussionmentioning

confidence: 99%

“…() showed that haul‐out locations of harbor seals in Cook Inlet, Alaska occur more distantly from human communities than expected on the basis of natural habitat features. With increasing human disturbance, historically profitable areas for seals ( e.g ., where they rest or target prey; Brown and Mate , Bayer , Thompson et al . ) are likely to be degraded and show a decline in use as seals pioneer new habitat (Harris et al .…”

Section: Study Areamentioning

confidence: 99%

See 1 more Smart Citation

Natural and human effects on harbor seal abundance and spatial distribution in an Alaskan glacial fjord

Jansen

Boveng

Hoef

et al. 2014

Marine Mammal Science

View full text Add to dashboard Cite

Tidewater glacial fjords support the largest populations of harbor seals (Phoca vitulina richardii) in Alaska and are a prime destination for tour ships. Chronic disturbance from ships, however subtle, could impact long-term population stability. We examined variation in abundance and distribution of harbor seals on floating ice in Disenchantment Bay, Alaska, a tour ship destination for over a century with near daily visitation by ships in the spring/summer over the last decade. Counts of seals by aerial transect showed a sharp decline in May, prior to pupping and the first ships arriving; counts rebounded by the end of June remaining high until August. Seal distribution and abundance peaked in 5-7 tenths ice cover; total area of ice cover showed no effect. Despite regular flushing of seals by ships, we found no broad-scale patterns in seal abundance and distribution that could be explained by ship presence. We cannot rule out mechanisms of long-term disturbance, difficult to detect and that might explain notable differences with other, similar sites. Population declines at disturbed glacial sites and the still rising popularity of vessel-based tourism indicate a need for individual-based studies on how seals respond to the dynamics of glacial ice environments and human-caused stresses.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

Natural and human effects on harbor seal abundance and spatial distribution in an Alaskan glacial fjord

Jansen

Boveng

Hoef

et al. 2014

Marine Mammal Science

View full text Add to dashboard Cite

show abstract

“…Without this type of resource, seals can haul out on shore only at night when people are not present. Natural rafts and drifted trees stranded on tideflats very likely were once also used for haul-out by harbor seals and may have been one of the limiting resource for seal populations in Pacific Northwest estuaries (Bayer 1981(Bayer , 1985Calambokidis and others 1978).…”

Section: Fallen Trees In Salt Marshesmentioning

confidence: 99%