Red-shouldered hawk broadcast surveys: Factors affecting detection of responses and population trends
Red-shouldered hawk broadcast surveys: Factors affecting detection of responses and population trends
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红肩鹰广播调查：影响响应检测和种群趋势的因素
DOI：
10.2307/3802005
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发表时间：
1998
影响因子：
2.3
通讯作者：
D. E. Andersen
中科院分区：
文献类型：
--
作者：
M. A. McLeod;D. E. Andersen
森林筑巢的猛禽通常很难被发现和监测，因为它们可能是秘密的，而且它们的巢穴很难定位。然而，有些物种会对录音呼叫的广播做出反应，这些反应可能在监测种群趋势和定位巢穴方面都很有用。我们进行了广播调查的道路上，并在积极的红肩鹰（Buteo lineatus）在明尼苏达州中北部的巢，以确定影响的呼叫类型（同种或大角猫头鹰[Bubo virginianus]），一天中的时间，和繁殖周期阶段的红肩鹰的反应行为，并评估有用的广播作为人口监测工具，使用面积检测概率检测技术。在1994年和1995年的繁殖季节。我们调查了410个站点的道路样带59次，并在24个活跃的巢穴进行了76次调查。这些调查的结果表明，同种呼叫广播孵化前和当天早些时候是最有效的方法检测红肩鹰。通过同种呼叫检测的概率平均为0.25，所占面积为100%。利用这些实地数据进行的计算机模拟表明，广播调查有可能被用作人口监测工具。
Forest-nesting raptors are often difficult to detect and monitor because they can be secretive, and their nests can be difficult to locate. Some species, however, respond to broadcasts of taped calls, and these responses may be useful both in monitoring population trends and in locating nests. We conducted broadcast surveys on roads and at active red-shouldered hawk (Buteo lineatus) nests in northcentral Minnesota to determine effects of type of call (conspecific or great horned owl [Bubo virginianus]), time of day, and phase of the breeding cycle on red-shouldered hawk response behavior and to evaluate usefulness of broadcasts as a population monitoring tool using area occupted-probability-of-detection techniques. During the breeding seasons of 1994 and 1995. we surveyed 4 10-station road transects 59 times and conducted 76 surveys at 24 active nests. Results of these surveys indicated conspecific calls broadcast prior to hatch and early in the day were the most effective method of detecting red-shouldered hawks. Probability of detection via conspecific calls averaged 0.25, and area occupied was 100%. Computer simulations using these field data indicated broadcast surveys have the potential to be used as a population monitoring tool.