Survival rates are an essential parameter for understanding the dynamics and status of wild populations. Apparent survival (the combined probability of surviving and returning to a site) and capture rates were estimated for male Harlequin Ducks (Histrionicus histrionicus) (second-year, N = 30, adult, N = 83) that were captured and/or resighted on the Gannet Islands, Labrador, from 1999-2003. Most birds available for analysis were first captured locally (N = 74), although a significant number were originally banded on wintering grounds in Maine (N = 36), and the remaining three were banded on breeding grounds. Second-year male apparent survival rates were low (0.466 ± 0.118; 95% PLI: 0.256 - 0.689), and different from adult rates (0.744 ± 0.045; 0.647 - 0.822), likely due to increased dispersal of young birds. There was little evidence for annual variation in survival rates, but samples sizes were low. Apparent survival rates of male Harlequin Ducks were lower than found in most studies, suggesting that some males emigrate from the Gannet Islands molting site, but do confirm that there is some fidelity to molting sites, similar to observations of the Pacific population.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 31 • No. sp2