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Group Size of Harris's Hawks (Parabuteo unicinctus) in South Texas

机译:南德克萨斯州哈里斯鹰队(Parabuteo unicinctus)的团体大小

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摘要

Harris's Hawks (Parabuteo unicinctus) are cooperative breeders, and groups of more than a pair have been reported from Arizona (49% to 83%) and New Mexico (51%). However, two studies (Griffin 1976, Brannon 1980) suggested that they breed in groups infrequently in Texas (5% and 13%). During a banding study from 2004-2014, I occasionally captured three or more adults at the same time and place, and I regularly observed groups of three or more adults. I undertook a study to determine sizes of breeding groups in south Texas in 2014 and 2015 in a mix of breeding habitats, primarily thorn scrub forest, but also parks, agriculture with forest and grassy plots, industrial areas, and urban areas. I determined that more than half (56%) of the 73 breeding groups I observed in south Texas were composed of three or more individuals, contrary to the results of the two earlier Texas studies, which may have underestimated group size because of fewer short visits compared to longer visits spent determining group size in this study.
机译:哈里斯的鹰(Parabuteo unicinctus)是合作种鸽,据报道,亚利桑那州(49%至83%)和新墨西哥州(51%)的配对超过一对。但是,两项研究(Griffin 1976,Brannon 1980)建议它们在德克萨斯州很少成群繁殖(5%和13%)。在2004年至2014年的一项分类研究中,我偶尔会在同一时间和地点捕获三个或更多成年人,并且定期观察三个或三个以上成年人的群体。我进行了一项研究,以确定2014年和2015年德克萨斯州南部繁育栖息地的繁殖群规模,这些栖息地主要是刺灌木林,但也包括公园,有森林和草皮地块的农业,工业区和城市地区。我确定我在德克萨斯州南部观察到的73个育种组中,有一半以上(56%)由三个或更多个体组成,这与德克萨斯州较早的两项研究结果相反,后者的研究结果可能是低估了种群数量,因为短期访问次数较少与花费较长时间进行拜访的人数相比,这项研究确定了小组人数。

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