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The Current State of the Demoiselle Crane Population in the Transural Steppe

机译:穿行草原上the羽鹤种群的现状

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The Demoiselle crane population was studied in the southern Chelyabinsk region (52°12'N; 60°21'E) during 1988—2008. Counts of nesting pairs were annually conducted over an area of 100-130 km~2 in May. The number of breeding pairs varied from 6.5 to 9.5 per 100 km2; on average, there were 8 pairs per 100 km2 during 1989-1991. In 2000-2008, the population density increased from 7.5 to 12 pairs per 100 km~2, on average, 9.3 pairs per 100 km~2. Demoiselle crane nesting in steppe pastures and perennial grass fields has been rarely observed for the last decade. Now the main nesting biotopes of the species are stubble fields accounting for up to 70% of all nidification cases documented. The decline in agricultural production in recent decades has resulted in the appearance of long-fallow lands, in which 17 to 35% crane pairs nest.
机译:在1988-2008年期间,在车里雅宾斯克州南部(北纬52°12';东经60°21')对studied羽鹤种群进行了研究。每年五月在100-130 km〜2的区域内进行筑巢对的计数。每100 km2的繁殖对数量从6.5到9.5不等; 1989-1991年期间,平均每100平方公里有8对。 2000-2008年,人口密度从每100 km〜2 7.5对增加到12对,平均每100 km〜2 9.3对。在过去的十年中,很少观察到羽鹤在草原和多年生草地上的筑巢。现在,该物种的主要筑巢生物群落是留茬田地,占所有记载的硝化病例的70%。近几十年来农业产量的下降导致出现了长休耕地,其中有17至35%的鹤对筑巢。

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