Raptor Research News
With Scientist & Citizen-Scientist Participation
Sponsored by Hancock Wildlife Foundation

Bald Eagles of Alaska - Section: 13 Page: 100 - Perspectives on the Breeding Biology of Bald Eagles in Southeast Alaska

Book Index :: Previous Page :: Section Index :: Next Page :: Original PDF 


Individual Images From This Page

Bald Eagles of Alaska - Chapter: Section-13 - Perspectives on the Breeding Biology of Bald Eagles in Southeast Alaska - Page: BEIA_0100 Image#: 0


NOTE: This web page was built from the original PDF. Please consult the original.

Book Index :: Previous Page :: Section Index :: Next Page :: Original PDF


critical period in terms of food availability. However, this does not appear to be the case for eagles in Southeast Alaska. Until pink salmon become available in late June, eagles seem to be able to supplement their diet with a wide variety of fish. I have often observed 4 or 5 species of fish (including walleye pollock, starry flounders, herring, sand lance and rockfish) cached in the nest at one time in early June (11). Once pink salmon begin milling in near-shore water by late June or early July, they are utilized extensively by eagles (Imler and Kalmbach 1955, Ofelt 1975, Cain 1985). From fish remains in nests and from foraging observations, I think that eagles use pink salmon almost exclusively from the time they arrive in the shallows until after eaglets have fledged. Without pink salmon present, the nestling period would almost surely be more taxing in terms of food availability for adults and likely to be more limiting to nestling survival (12). Bald Eagles cache food in their nest as seen in this photo. Also, note the size difference of these siblings. Photo by Scott Gende. Another possible reason eagles are not food limited during the nestling stage is that adults are less constrained to the nest once eggs hatch. Adults will spend less time at the nest as chicks develop (Cain 1985), thereby leaving more time to forage (Watson et al. 1991).

100

OCR
Tag: eaglets eggs fledged flounders kalmbach nestling nests salmon watson

|

0 comments

My Account





Sign up as a New User
Lost your password?