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Conspecific attraction in loggerhead shrikes: implications for habitat conservation and reintroduction

机译:顶头sh的特定吸引:对栖息地保护和重新引入的影响

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The loggerhead shrike, Lanius ludovicianus, is a declining songbird that forms breeding aggregations. Despite such reports from several populations, only one statistical analysis of loggerhead shrike territory distribution has been published to date. I use a spatio-temporal simulation technique to test for deviations from randomness in the spatial distribution of point data that takes into account date of nest establishment. I apply this model to data on the distribution of shrike nests in Comanche County, Oklahoma, USA, collected over the 1998 and 1999 breeding seasons. When the data are considered without regard to date of nest-establishment, the results are equivocal; nests are significantly aggregated in 1999, but not 1998. However, when order of nest establishment is taken into account, later nests are significantly more likely to be closer than expected to conspecifics in both years. This is true even when the distribution of simple resources, such as suitable nest-trees, is included in the model. These results are consistent with the hypothesis that loggerhead shrikes 'prospect' for suitable habitat using the distribution of breeding conspecifics. This aspect of loggerhead shrike breeding ecology should be considered for both habitat conservation and captive breeding and reintroduction programs for this species.
机译:logger伯劳伯劳鸟(Lanius ludovicianus)是一羽下降的鸣禽,形成繁殖群。尽管有来自多个人群的此类报告,但迄今为止,仅发表了有关头伯劳鸟领土分布的统计分析。我使用时空仿真技术来测试点数据的空间分布中随机性的偏差,该偏差考虑了建立巢穴的日期。我将此模型应用于1998年和1999年繁殖季节收集的美国俄克拉荷马州科曼奇县伯劳鸟巢的分布数据。当不考虑建立巢穴的日期而考虑数据时,结果是模棱两可的。巢在1999年的聚集非常明显,但1998年却没有。但是,考虑到巢的建立顺序,在以后的两年中,较晚的巢比同种异体的可能性要大得多。即使在模型中包括简单资源(例如合适的嵌套树)的分配时,也是如此。这些结果与这样的假设相吻合,即牛利用繁殖物种的分布来“寻找”合适的栖息地。对于该物种的栖息地保护以及圈养繁殖和再引入计划,都应考虑黑伯劳繁殖生态学的这一方面。

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