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首页> 外文期刊>The Canadian Field-Naturalist >Productivity of Ospreys, Pandion haliaetus, Affected by Water Levels Near Loon Lake, Saskatchewan, 1975-2002
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Productivity of Ospreys, Pandion haliaetus, Affected by Water Levels Near Loon Lake, Saskatchewan, 1975-2002

机译:1975-2002年,萨斯喀彻温省Loon湖附近水位对鱼鹰,人鱼ion的生产力的影响

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摘要

Between 1975 and 2002, diminished breeding success of Ospreys was associated with drought and falling lake levels in the western half of our study area near the town of Loon Lake, west-central Saskatchewan. Only 46% of nest attempts were successful in the west compared to 72% in the east, producing 0.88 young per accessible nest in the west and 1.42 in the east. Breeding success was greater in the eastern half, where water levels were stable, in spite of increased human use of the resort lakes there. Our unique long-term Canadian data base results support Ogden's 1977 prediction that Osprey productivinymay decrease when water levels drop and fish populations are reduced.
机译:在1975年至2002年之间,鱼鹰繁殖成功率的下降与萨斯喀彻温省中西部卢恩湖镇附近我们研究区域西半部的干旱和湖泊水位下降有关。西部只有46%的筑巢尝试成功,而东部为72%,在西部,每个可到达的筑巢育有0.88头幼鸟,在东部则有1.42头。尽管人们增加了对休养湖的利用,但在水位稳定的东半部,繁殖成功率更高。我们独特的加拿大长期数据库结果支持了奥格登(Ogden)1977年的预测,即当水位下降和鱼类种群减少时,鱼鹰的产量可能下降。

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