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首页> 外文期刊>California Fish and Game >A CHANGE IN WATERFOWL SPECIES COMPOSITION IN THE HONEY LAKE VALLEY, CALIFORNIA
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A CHANGE IN WATERFOWL SPECIES COMPOSITION IN THE HONEY LAKE VALLEY, CALIFORNIA

机译:加利福尼亚蜂蜜湖谷水禽种类组成的变化

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摘要

Evidence suggests that species composition of ducks may be changing in some waterfowl breeding areas (U.S. Fish and Wildlife Service 2005), including that of the western margin of the Great Basin (Hunt and Naylor 1955, Rienecker and Anderson 1960, Jarvis and Harris 1971, Clark 19773, Bogiatto 1998). In particular, across the western Great Basin, the proportion of gadwall, Anas strepera, may be increasing relative to other species of ducks. Before 1980, abundance (breeding pairs and/or number of nests) of mallards, A. platyryhnchos, in the Great Basin was similar to (Rienecker and Anderson 1960) or greater than (Hunt andNaylor 1955, Jarvis andHarris 1971, Clark 1977) that of gadwall. At least one study, however, suggests that gadwall abundance may greatly exceed that of the mallards in recent years (Bogiatto 1998).
机译:有证据表明,在某些水禽繁殖区(美国鱼类和野生动物服务局,2005年),包括大盆地西缘(Hunt和Naylor,1955年,Rienecker和Anderson,1960年,Jarvis和Harris,1971年,克拉克(Clark)19773,博贾托(Bogiatto)1998。特别是在整个大盆地西部,野鸭(Anas strepera)的比例相对于其他种类的鸭子可能正在增加。在1980年之前,大盆地的绿头野鸭(A. platyryhnchos)的丰度(繁殖对和/或巢数)类似于(Rienecker和Anderson 1960)或大于(Hunt和Naylor 1955,Jarvis andHarris 1971,Clark 1977)。 gadwall。然而,至少有一项研究表明,近年来野鸭的丰度可能大大超过野鸭的丰度(Bogiatto 1998)。

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