. Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage . Fig. 123.—A bird island: Eiderholm in southwest Iceland. After Hantsch. bird population may vary from year to year at the same locality. In King Charles Land, only 9 species of marine birds were found in 1889, when ice conditions were unfavorable, whereas 21 species were reported in 1898. Arctic sea birds nest either on steep rock cliffs which rise from the sea or on small islands. The cliffs are inaccessible to predators, and the islands are, or become so, when the ice has bro
. Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage . Fig. 123.—A bird island: Eiderholm in southwest Iceland. After Hantsch. bird population may vary from year to year at the same locality. In King Charles Land, only 9 species of marine birds were found in 1889, when ice conditions were unfavorable, whereas 21 species were reported in 1898. Arctic sea birds nest either on steep rock cliffs which rise from the sea or on small islands. The cliffs are inaccessible to predators, and the islands are, or become so, when the ice has broken up in spring. These two types of breeding place are adopted by different birds; the arctic sea birds may be divided into cliffs breeders and island The eider ducks {Somateria molissima and S. spectabilis, Fig. 123) form the principal element in the population of the arctic bird islands. They take up their breeding residence only after the break-up of the ice. Where they are undisturbed they may nest so close together that it is impossible to walk without stepping on Barnacle geese, knots, phalaropes, and terns are associated with the eiders. All live
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Keywords: ., bookcentury1900, bookcollectionbiodive, booksubjectanimalecology
