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首页> 外文期刊>Journal of Field Ornithology >Fishing success of gulls at a southeast Aladka smelt run
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Fishing success of gulls at a southeast Aladka smelt run

机译：海鸥在阿拉德加东南部的一次冶炼捕鱼成功

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摘要

We observed foraging behavior and success of gulls (Larus spp.) at spawning runs of eulachon (Thaleichthyes pacificus, Osmeridae) in Berners Bay, Alaska, in spring 1996-1998. Adults foraged more effectively (>=56/100 of dives were successful) than immatures (<=56/100) when diving for fish, but there was little difference in the effectiveness of piracy (<=23/100 success for all gull species and age classes). The hypothesis that larger birds would be better pirates and less likely to lose prey to pirates was not well supported, although smaller species seldom attacked larger ones. Age classes less successful at foraging were more likely to act as pirates, but this relationship did not hold among species or between years. The frequency of piracy attempts was positively correlated with the availability of fish captured by other birds.
机译：我们观察了1996-1998年春季在阿拉斯加伯纳斯湾的欧拉雄（Thaleichthyes pacificus，Osmeridae）产卵过程中海鸥（Larus spp。）的觅食行为和成功情况。与未成熟鱼类（<= 56/100）相比，成鱼觅食更有效（> = 56/100潜水成功），但海盗行为的有效性差异不大（所有海鸥物种<= 23/100）和年龄段）。尽管较小的物种很少攻击较大的鸟类，但较大的鸟类将是更好的海盗，而不太可能失去猎物的假说并未得到很好的支持。在觅食方面较不成功的年龄段更有可能充当海盗，但这种关系在物种之间或年份之间不成立。盗版尝试的频率与其他鸟类捕获的鱼类的数量呈正相关。

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