Stability in The Proportion of Harbor Seals Hauled Out Under Locally Ideal Conditions


Autoria(s): Simpkins, Michael; Withrow, David; Cesarone, Jack; Boveng, Peter
Data(s)

01/10/2003

Resumo

We monitored the haul-out behavior of 68 radio-tagged harbor seals (Phoca vitulina) during the molt season at two Alaskan haul-out sites (Grand Island, August-September 1994; Nanvak Bay, August-September 2000). For each site, we created a statistical model of the proportion of seals hauled out as a function of date, time of day, tide, and weather covariates. Using these models, we identified the conditions that would result in the greatest proportion of seals hauled out. Although those “ideal conditions” differed between sites, the proportion of seals predicted to be hauled out under those conditions was very similar (81.3% for Grand Island and 85.7% for Nanvak Bay). The similar estimates for both sites suggest that haul-out proportions under locally ideal conditions may be constant between years and geographic regions, at least during the molt season.

Formato

application/pdf

Identificador

http://digitalcommons.unl.edu/usdeptcommercepub/145

http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1151&context=usdeptcommercepub

Publicador

DigitalCommons@University of Nebraska - Lincoln

Fonte

Publications, Agencies and Staff of the U.S. Department of Commerce

Palavras-Chave #Environmental Sciences
Tipo

text