| Abstract: | We radio-marked 99 Cassin‘s Auklets (Ptychoramphus aleuticus) nesting at two colonies, Prince Island and Scorpion Rock, separated by 90 km in the California Channel Islands to quantify foraging distance, individual home-range area, and colony-based foraging areas during three consecutive breeding seasons. Auklets generally foraged <30 km from each colony in all years. Core foraging areas (50% fixed kernel) from Prince Island in 1999-2001 were north to northeast of the colony over the insular shelf near the shelfbreak. Core foraging areas from Scorpion Rock in 2000-2001 occurred in two focal areas: the Anacapa Passage, a narrow interisland passage adjacent to the colony, and over the southeastern Santa Barbara Channel. During 2000, intercolony foraging areas overlapped by 10%; however, auklets from each colony used the overlapping area at different times. Equivalent-sample-size resampling indicated Prince Island foraging area (1216 ?? 654 km2) was twice that of Scorpion Rock (598 ?? 204 km2). At Prince Island, mean individual distances, home-range areas, and colony-based activity areas were greater for females than males, especially during 2001. At Prince Island, core foraging areas of females and males, pooled separately, overlapped by 63% in 1999 and 2000, and by 35% in 2001. Postbreeding auklets from both colonies dispersed northward and moved to active upwelling centers off central California, coincident with decreased upwelling and sea-surface warming throughout the Santa Barbara Channel. |
| Genre: | Article |
| ProdID: | 70026805 |
| Citation Author: | Adams, J.; Takekawa, J. Y.; Carter, H. R. |
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| Citation End Page: | 637 |
| Citation Issue: | 3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Condor |
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| Citation Number Of Pages: | 20 |
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| Citation Search Results Text: | Foraging distance and home range of Cassin‘s Auklets nesting at two colonies in the California Channel Islands; 2004; Article; Journal; Condor; Adams, J.; Takekawa, J. Y.; Carter, H. R. |
| Citation Start Page: | 618 |
| Citation Volume: | 106 |
| Citation Year: | 2004 |
| Type: | citation/reference |
| Text: | Foraging distance and home range of Cassin‘s Auklets nesting at two colonies in the California Channel Islands; 2004; Article; Journal; Condor; Adams, J.; Takekawa, J. Y.; Carter, H. R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Thu, 1 Jan 2004 00:00 -0600 |
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