Hooded Merganser

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Mergansers Order Anseriformes Family Anatinae Subfamily Mergini The Mergansers are grouped among the diving ducks but belong to their own subfamily. They are long, slender-bodied diving ducks with long, narrow saw-edged (or serrated - below, center) bills, which help them grip and hold on to fish. Often called “sawbirds,” mergansers are known for their colorful plumage and habits of flying fast & close to the water’s surface. Most species have crests on their heads, which they can hold up or down at will (top photos and below left). In flight, their head, bill, body and tail are held in a straight horizontal line. Mergansers prey on fish, fish eggs and other aquatic animals. The hooded merganser (Lod- phodytes cucullatus) - top right -lives among reeds in Pennsylvania’s swampy, woodland habi- tats using a tree cavity near a pond, lake, river or stream. They will also use a man-made nesting box placed in the proper habitat. The common merganser (Mergus merganser) - top left) needs a wilder, less inhabited site in order to nest. They too are cavity-nesters, but will also nest in a rock pile or even a hole in a stream bank (like a kingfisher). Red-breasted merganser (Mergus serrator) females build her nests in thick vegetation on the ground - though she nests in Canada and Alaska, not in Pennsylvania. But they can be seen on our open rivers during mi- gration. Merganser ducklings from various nests are often grouped to- gether and looked after by a single female..

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Lophodytes Cucull Atus): Evidence from Genetic, Mark–Recapture, and Comparative Data John M
University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln USGS Staff -- ubP lished Research US Geological Survey 2008 Site Fidelity Is an Inconsistent Determinant of Population Structure in the Hooded Merganser (Lophodytes cucull atus): Evidence from Genetic, Mark–Recapture, and Comparative Data John M. Pearce 1U.S. Geological Survey, Alaska Science Center, 1U.S. Geological Survey, Alaska Science Center, [email protected] Peter Blums University of Missouri-Columbia, Puxico, Missouri Mark S. Lindberg University of Alaska, Fairbanks, Alaska Follow this and additional works at: http://digitalcommons.unl.edu/usgsstaffpub Pearce, John M.; Blums, Peter; and Lindberg, Mark S., "Site Fidelity Is an Inconsistent Determinant of Population Structure in the Hooded Merganser (Lophodytes cucull atus): Evidence from Genetic, Mark–Recapture, and Comparative Data" (2008). USGS Staff -- Published Research. 808. http://digitalcommons.unl.edu/usgsstaffpub/808 This Article is brought to you for free and open access by the US Geological Survey at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in USGS Staff -- ubP lished Research by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. The Auk 125(3):711–722, 2008 The American Ornithologists’ Union, ��2008. Printed in USA. SITE FIDELITY Is AN INCONSISTENT DETERMINANT OF POPULATION STRUCTURE IN THE HOODED MERGANSER (LOPHODYTES CUCUllATUS): EVIDENCE FROM GENETIC, MARK–RECAPTURE, AND COMPARATIVE DATA JOHN M. PEARCE,1,2,4 PETER BLUMS,3,5 AND MARK S. LINDBERG2 1U.S. Geological Survey, Alaska Science Center, 4210 University Drive, Anchorage, Alaska 99508, USA; 2Institute of Arctic Biology and Department of Biology and Wildlife, University of Alaska, Fairbanks, Alaska 99775, USA; and 3Gaylord Memorial Laboratory, The School of Natural Resources, University of Missouri-Columbia, Puxico, Missouri 63960, USA Abstract.—The level of site fidelity in birds is often characterized as “high” on the basis of rates of return or homing from mark–recapture data.
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