The dispersion of arctic breeding birds according to snow-free patch dimensions during the spring thaw in the north-eastern Taimyr Peninsula, Russia
Tóm tắt
The dispersion of passerines, ptarmiganLagopus mutus and waders in relation to available snowfree patches is described after spring arrival but prior to the main thaw at Pronchishcheva Lake, north-eastern Taimyr, in June 1991. The numbers of ptarmigan and passerines were proportional to patch perimeter but disproportionately more birds occurred on smaller patches. In contrast, wader numbers were proportional to patch area but disproportionately more occurred along the perimeters of large patches. These patterns are discussed in relation to risk of predation and food availability. We speculate that the predation risk is higher in small patches for uniformly coloured birds but may be lower for white and pied species. The availability of overwintering plants, fresh plant growth and insects is thought to be highest at the perimeters of snow-free patches.
Tài liệu tham khảo
Byrkjedal I (1980) Nest predation in relation to snow-cover — a possible factor influencing the start of breeding in shorebirds. Ornis Scand 11:249–252
Chernov YuI (1985) The living tundra. Cambridge University Press, Cambridge
Dement'ev GP, Gladkov NA, Spangenberg EP (1951) The birds of the Soviet Union, vol 3. Israel Program for Scientific Translation, Jerusalem
Fox AD, Stroud DA (1986) Diurnal rhythms in a snow-surface springtail (Isotoma violacea, Collembola) and its predators in Eqalungmiut Nunaat, West Greenland. Pedobiologia 29:405–412
Fox AD, Gitay H, Boyd H, Tomlinson C (1991) Snow-patch foraging by pink-footed geeseAnser brachyrhynchus in south Iceland. Holarct Ecol 14:81–84
Green GH, Greenwood JJD, Lloyd CS (1977) The influence of snow conditions on the date of breeding of wading birds in north-east Greenland. J Zool London 183:311–328
Møller AP (1988) Nest predation and nest site choice in passerine birds in habitat patches of different size: a study of magpies and blackbirds. Oikos 53:215–221
Nethersole-Thompson D (1966) The snow bunting. Oliver and Boyd, Edinburgh/Salomonsen F (1950) The birds of Greenland. Munksgaard, Copenhagen
Tomkovich PS (1985) Biology of the purple sandpiper on Franz Josef Land. Ornitologiya 20:3–17
Underhill LG, Prŷs-Jones RP, Syroechkovski EE Jr, Groen NM, Karpov V, Lappo HG, van Roomen MWJ, Rybkin A, Schekkerman H, Spiekman H, Summers RW (1993) Breeding of waders (Charadrii) and Brent geeseBranta bernicla bernicla at Pronchishcheva Lake, northeastern Taimyr, Russia, in a peak and decreasing lemming year. Ibis Ornitologiya 135:277–292