Mid-winter activity budgets and diving behaviors of Harlequin Ducks (Histrionicus histrionicus) at Isle au Haut, Maine were examined. Feeding was the most frequent activity and the number of hours during the day devoted to feeding increased from December to March as day length increased. Resting was not a frequent mid-winter activity, but birds rested more in the morning than in the afternoon and the duration of resting bouts increased in March, likely in relation to increasing day length. During foraging bouts, first-winter males had longer submergence times and longer pause times than adult males, although the resulting dive:pause ratio was similar. This may be related to feeding inefficiency of the young birds or lack of experience with local habitats or prey species. Mean dive durations and pause durations at Isle au Haut were greater than reported elsewhere for this species, and may be related to strong local currents associated with the wave washed ledges on Isle au Haut.
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