By Jean-Pierre L. Savard, Dirk V. Derksen, Dan Esler, John M. Eadie
The earlier decade has noticeable a big elevate within the curiosity and a spotlight directed towards sea geese, the Mergini tribe. This has been encouraged, largely, via the conservation matters linked to numerical declines in different sea duck species and populations, in addition to a growing to be appreciation for his or her attention-grabbing ecological attributes. Reflecting the enormous learn lately carried out in this tribe, Ecology and Conservation of North American Sea Ducks examines the 15 extant species of sea geese from North America.
Chapters are prepared conceptually to target, examine, and distinction the ecological attributes of the tribe. specialists offer in-depth remedies of more than a few subject matters, including:
- Population dynamics and genetics
- Infectious illnesses and parasites
- Breeding expenditures and cross-seasonal affects
- Contaminant burdens
- Foraging habit and energetics
- Migration thoughts, molt ecology, and habitat affinities and dynamics
- Breeding structures and reproductive behavior
- Harvest heritage
The booklet offers a accomplished synthesis of sea duck ecology, records components that experience prompted inhabitants declines of a few species, and offers managers with measures to reinforce restoration of depressed populations of sea geese in North the US. shooting the present kingdom of information of this designated tribe, it offers a benchmark for the place we're in conservation efforts and indicates destiny instructions for researchers, managers, scholars, conservationists, and avian fanatics.
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Extra resources for Ecology and Conservation of North American Sea Ducks
2013). Densities also appeared slightly higher in 2007–2009 compared with 1972–1973. In 1989, the Exxon Valdez oil spill had a significant impact on the Harlequin Duck population in Prince William Sound, and recovery has been slow (Iverson and Esler 2010). The most recent survey in 2009 estimated 12,500 Harlequin Ducks in surveyed areas of Prince William Sound—a minimal estimate of total population size because not all areas were surveyed. On Kodiak Island, Alaska, several bays with a combined population of at least 3,000 Harlequin Ducks were surveyed from 1994–1997 and 2004–2007.
Islandica), (d) Long-tailed Duck (C. hyemalis), (e) mergansers (Mergus spp. and L. ) from the WBPHS for 1974–2012 in the midcontinent and Alaska and for 1996–2012 in the east. Segments are colored according to log density, low to high: white–light gray–dark gray–black. Segments where no birds were present (zero density) are not shown. All Spectacled Eider breeding populations were listed as threatened in 1993 because of documented population declines. Surveys of the only known wintering area of this species, presumed to represent the world population, were conducted in 1997, 1998, 2009, and 2010.
About 75% of the Canadian breeding population overwinter primarily in Greenland, with smaller numbers wintering in coastal Newfoundland and along the North Shore of the Gulf of St. Lawrence (Gilliland et al. 2009a). Obtaining reliable estimates of abundance during winter is complicated because they occur in three countries, including Canada, Greenland, and the French islands of St. Pierre and Miquelon, and mix to an unknown degree with other subspecies of Common Eiders (S. m. dresseri, Gilliland and Robertson 2009, Gilliland et al.