Resources related to Ecology

Implications of Demographic Uncertainty for Harvest Management of North American Sea Ducks

In 2010, the Sea Duck Joint Venture (SDJV) identified the need for improved science support for harvest and habitat management of North American sea ducks.
In order to prioritize monitoring and research needs in support of harvest management, we applied a Prescribed Take Level (PTL) framework to assess the influence of uncertainty about sea duck demographic
parameters on comparisons of observed and allowable harvest estimates. We focused on 7 populations of North American sea ducks: the American subspecies of common eider (Somateria mollissima dresseri

Habitat Features Associated with Barrow's Goldeneye Breeding in Eastern Canada

We investigated environmental variables linked to presence of Barrow's Goldeneye (Bucephala islandica) pairs from the eastern North American population on 412 lakes of the Sainte-Marguerite River watershed, Québec, Canada. We analysed habitat relationships at two spatial scales (i.e., considering all lakes surveyed and high elevation lakes only) and predetermined the high elevation lakes as those including 90% of Barrow's Goldeneye occurrences. Barrow's Goldeneye were found on 59 lakes, all of which were ≥490 m elevation (maximum = 822 m) with 90% at ≥610 m.

Site fidelity and the demographic implications of winter movements by a Migratory Bird the Harlequin Duck (Histrionicus)

Understanding the degree of demographic connectivity among population segments is
increasingly recognized as central to the fields of population ecology and conservation
biology. However, delineating discrete population units has proven challenging,
particularly for migratory birds as they move through their annual cycle. In this
study, radio telemetry was used to assess movement rates among habitats by harlequin
ducks Histrionicus histrionicus during the non-breeding season in Prince William

Hydroxylated and methoxylated polybrominated diphenyl ethers in long-tailed ducks (Clangula hyemalis) and their main food, Baltic blue mussels (Mytilus trossulus × Mytilus edulis).

• OH-PBDEs, MeO-PBDEs and PBDEs in blue mussel and long-tailed duck were measured.
• OH- and MeO-PBDE levels were higher in birds sampled the Baltic than in the Arctic.
• OH- and MeO-PBDE levels were higher in mussels in the Baltic Sea than in the Arctic.
• Levels of OH-PBDEs in Baltic blue mussels were significantly higher in summer.

Body Composition Dynamics of Common Eider During Winter: An Application of the Deuterium Dilution Method

The nearshore and offshore waters of southern New England provide some of the most
important wintering habitat for sea ducks in North America. Understanding changes in sea duck body
composition during winter could provide insights into current habitat quality and potential effects of
anthropogenic disturbances on the body condition of sea ducks. We used the deuterium dilution method, a
nonlethal approach, to investigate intraseasonal variation and differences between genders in body

Fitting statistical distributions to seaduck count data: Implications for survey design and abundance estimation

Determining appropriate statistical distributions for modeling
animal count data is important for accurate estimation of abun-
dance, distribution, and trends. In the case of sea ducks along the
U.S. Atlantic coast, managers want to estimate local and regional
abundance to detect and track population declines, to define
areas of high and low use, and to predict the impact of future
habitat change on populations. In this paper, we used a modified
marked point process to model survey data that recorded flock

Sea Duck Joint Venture Implementation Plan 201 5 - 201 7

PRIORITIES 2015–2017 Priorities set out in this Implementation Plan are designed to help meet the SDJV mission,
which is to “...promote the conservation of all North American sea ducks through partnerships by providing greater
knowledge and understanding for effective management.”
The 2014-2018strategic plan reflects a significant shift in focus for the SDJV, from a broad-based science program
to a more focused program intended to provide information most needed by managers to make informed

Food Habits of Sea Ducks Atlantic Maritimes

Numbers of scoters (black, surf, and white-winged) and long-tailed ducks wintering in the Maritime provinces of Canada and the Chesapeake Bay (MD and VA, USA) have noticeably declined in recent years. Common goldeneye populations have also declined. Changes in the location of these seaduck populations have also been observed and have given managers new concerns. Many factors related to human population increases have been implicated in causing changes in the distribution and abundance of seaducks.