Foraging values of Mulinia lateralis and Ischadium recurvum: Energetics effects of surf scoters wintering in the Chesapeake Bay.
Doctoral Thesis / Dissertation 150 pages
Abstract or Introduction
Doctoral Thesis / Dissertation 150 pages
Abstract or Introduction
Wiggins, D. (2005, October 17). Harlequin Duck (Histrionicus histrionicus): a technical conservation assessment. [Online]. USDA Forest Service, Rocky Mountain Region.
j. Raptor Res. 37(2):164-166¸ 2003 The Raptor Research Foundation, Inc.
Short Communications
While studying the ecology of sea ducks wintering around the Belcher Islands, we
also recorded Snowy Owls (Gilchrist and Robertson 2000). Herein, we expand on
our observations of Snowy Owls, describing their distribution and their relationship
w•th wintering Common Eiders (Somateria mollissima) and Long-tailed Ducks (Clangula hyemalis).
Cooke, Wells. 1906. Distribution and Migration of North American Ducks, Geese and Swans. United States Department of Agriculture Bulletin. No. 26. 46 pp.
This study is a large scale, multi-year, collaborative project that will use satellite telemetry to document annual migration patterns and habitat use. Driven by a lack of knowledge on sea duck distribution, migration patterns, and seasonal habitats used, the Sea Duck Joint Venture (SDJV) partnership has launched a large-scale satellite telemetry study of sea ducks in the Atlantic Flyway. From 2009 to 2013, about 300 transmitters will be deployed in four species: Black Scoter, Surf Scoter, White-winged Scoter, and Long-tailed Duck - all species of high conservation concern.
Introduction: Historically, the Chesapeake Bay has been a major wintering area for seaducks. Based on aerial surveys, three species of seaducks, surf scoters (Melanitta perspicillata), black scoters (Melanitta nigra), and long-tailed ducks (Clangula hyemalis), have shown major declines in recent years. One possible explanation for this decline is a reduction of available food items.Data indicates that surf and black scoters likely feed at depths ranging from 10 to 30 feet in the mesohaline region of the Chesapeake Bay.
North American populations of breeding surf scoters and long-tailed ducks appear to be decreasing. Along the Atlantic coast, wintering populations of surf scoters are suspected to be decreasing, while the status of wintering populations of long-tailed ducks remains unknown. These trends have led conservation organizations to assign a "high" relative conservation priority to both species.
Behavioral Responses to Decreasing Day Length in Wintering Sea Ducks
Geir H. Systad, Jan O. Bustnes and Kjell E. Erikstad
The Auk
Vol. 117, No. 1 (Jan., 2000), pp. 33-40
(article consists of 8 pages)
Abstract
The Atlantic Seaduck Project is being conducted to learn more about the breeding and molting areas of seaducks in northern Canada and more about the feeding ecology of seaducks on wintering areas, especially Chesapeake Bay. Satellite telemetry is being used to track surf scoters wintering in Chesapeake Bay, Maryland, and black scoters on migrational staging areas in New Brunswick, Canada, to breeding and molting areas in northern Canada
As constituted here, the tribe Mergini includes all the species which Delacour and Mayr (1945) originally placed in the group.
Delacour later (1959) removed the four species of eiders and placed them in a separate tribe, Somateriini, between the dabbling ducks and
pochards. This was done apparently as a result of Humphrey's anatomical studies (1955, 1958), which suggested that the eiders might