Factors influencing the at-sea distribution of Cassin's Auklets (Ptychoramphus aleuticus) that breed in the Channel Islands, California
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Abstract
We used radiotelemetry to evaluate at-sea habitat use by Cassin's Auklets (Ptychoramphus aleuticus) that bred at Prince Island, off southern California, from 1999 through 2001. We used logistic regression to compare paired radiotelemetry (presence) with random (pseudo-absence) location-associated habitat variables derived from (1) satellite remote-sensing of sea surface temperature and chlorophyll-a concentration and (2) bathymetry. Compared with random locations within their foraging area and after controlling for distance to colony, odds ratios indicated that Cassin's Auklets with dependent young occurred in relatively shallower, warmer, and chlorophyll-rich water associated with chlorophyll fronts near the insular shelf break. These oceanographic features characterize habitats that support key euphausiid prey (e.g., Thysanoessa spinifera) and also other krill predators. Radiotelemetry combined with satellite remote-sensing of the ocean provides an alternative to vessel-based surveys for evaluating seabird foraging habitats. In the absence of information on the actual distribution, abundance, and, hence, availability of Zooplankton prey for seabirds, environmental factors can serve as proxies to help elucidate distributional patterns of seabirds at sea.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Factors influencing the at-sea distribution of Cassin's Auklets (Ptychoramphus aleuticus) that breed in the Channel Islands, California |
| Series title | The Auk |
| DOI | 10.1525/auk.2010.09273 |
| Volume | 127 |
| Issue | 3 |
| Year Published | 2010 |
| Language | English |
| Publisher | American Ornithological Society |
| Contributing office(s) | Western Ecological Research Center |
| Description | 11 p. |
| First page | 503 |
| Last page | 513 |
| Country | United States |
| State | California |
| Other Geospatial | Channel Islands |
| Google Analytic Metrics | Metrics page |