遗鸥繁殖生境选择及其繁殖地湿地鸟类群落研究

本文就遗鸥(Larus relictus)在内蒙古鄂尔多斯高原对其繁殖生境的选择和该生境下所出现的湿地鸟类种类、数量、居留习性等作了记述,并对该地湿地鸟类的区系成份、生境类型与种的生态分布及数量配比关系、伴生种问题及东方白鹳(Ciconia boyciana)在鄂尔多斯的发现等作了分析和探讨。

BREEDING HABITAT SELECTION OF THE RELICT GULL AND THE WETLAND BIRD COMMUNITY AROUNDITS BREEDING SITES

In 1990-1991, two breeding sites of the Relict Gull (Larus relictus) were discovered successively on Ordos Highland of Inner Mongolia with a total of 1115 nests of colonies occuring in 1991 making it the largest breeding population of the gull in the world. By the field work results as well as previous reports on the gull, i. e., breeding in desert lakes and only nesting on islets as known so far of the breeding site selection, it might be concluded that this gull species is of high adaptability to the desert habitat and therefore might be properly regarded as one of the representatives of those desert birds. It is also observed that on Ordos Highland the Relict Gull and the Gull-billed Tern (Gelochelidon nilotica) are the companion species with each other, though in most cases the Relict Gull is dominant, competition and interdependence existing between the two species. The wetland birds community occuring at the breeding sites of the Relict Gull also shows a strong tendency of being a more affinity of the specific desert bird group.