By Chris Waltho, John Coulson
A universal sight round the extra northerly seashores of the British Isles, the typical Eider is the biggest duck within the northern hemisphere. The eider is very good tailored to cold-water environments; the insulating homes of eider down are iconic. The species is taxonomically attention-grabbing, with various well-marked subspecies reflecting the styles of ice insurance in the course of historical glaciations, and those geese have additionally supplied the focal point for a couple of vital behavioural reviews, in particular on feeding ecology and effort budgets.
Eiders have a protracted organization with people, and feature deep cultural importance in lots of societies. notwithstanding, glossy existence are exposing those geese to a variety of new pressures.
This monograph offers a complete portrait of the typical Eider; authors Chris Waltho and John Coulson assemble an in depth and various foreign literature, with sections on taxonomy, habitats, breeding biology, inhabitants dynamics, nutrition and foraging, dispersal and migration, and conservation.
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A standard sight round the extra northerly beaches of the British Isles, the typical Eider is the most important duck within the northern hemisphere. The eider is very good tailored to cold-water environments; the insulating houses of eider down are iconic. The species is taxonomically attention-grabbing, with quite a number well-marked subspecies reflecting the styles of ice insurance in the course of historic glaciations, and those geese have additionally supplied the point of interest for a couple of very important behavioural reviews, specially on feeding ecology and effort budgets.
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Additional info for The Common Eider
1). Geographic isolation in refugia during glacial periods can result in reduced population mixing and over time lead to changes in genetic composition, morphological features and behavioural characteristics. Once the ice has melted, expanding populations from refugia may retain a degree of separation as discrete biogeographic populations. Some may even show suﬃcient diﬀerentiation (genetic or behavioural) from neighbouring populations to inhibit interbreeding, thus reinforcing their reproductive isolation.
3. The current biogeographic populations of Common Eider. Derived from data in Waterbird Population Estimates 5 (Wetlands International 2012). 3. The number of biogeographic populations across subspecies, recognised by Wetlands International. indd 44 07/11/2014 12:25 Process Black Origins, taxonomy and diﬀerentiation A number of genetic studies of eider have been undertaken over the last 20 years (Tiedemann & Noer (1998), Tiedemann et al. (1999), Tiedemann et al. (2004), Sonsthagen (2006), Sonsthagen et al.
Mollissima. The multiple samples demonstrate variation within S. m. v-nigrum and S. m. mollissima in the culmen. The greatest dimorphism is in S. m. dresseri and S. m. sedentaria. 15. Culmen measurements in both sexes in the North East Atlantic. These data show the largestbilled birds in the Baltic/Wadden Sea/North Sea, with declining size in Orkney, Shetland, the Faeroes and Iceland. The smallest culmen sizes are in Faeroes birds. Data from Schiøler (1907, 1914), Heubeck (1993) and personal data.