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Habitat associations with counts of declining Western Grebes in Alberta, Canada

机译：人居协会与加拿大艾伯塔省的西格里布数量下降

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During the past several decades, numbers of Western Grebes (Aechmophorus occidentalis) have declined throughout their breeding and wintering ranges in North America. We estimated Western Grebe abundance and documented habitat factors between 2007 and 2009 from 43 lakes in Alberta, Canada where Western Grebes historically have occurred, to (1) compare Western Grebe abundance with the relative probability of persistence, and (2) identify habitat correlates of grebe abundance. The relative probability of Western Grebe persistence was correlated with abundance in the study area, although only 19% of the variation in persistence probability was explained by abundance. Western Grebe abundance was positively correlated with the shoreline extent of emergent bulrush (Scirpus lacustris), which is consistent with past studies and underlies the importance of protecting emergent vegetation in efforts to conserve Western Grebes. Grebe abundance also was positively correlated with a longer shoreline perimeter, but was inversely correlated with the amount of forested backshore, which occurred on lakes primarily at the northern margins of Western Grebe range. The amount of backshore development was positively associated with Western Grebe abundance, which might reflect a preference for similar lake characteristics by humans and grebes. These relationships are important to consider in the context of implementing and managing recovery of the Western Grebe in Alberta.
机译：在过去的几十年中，在北美的整个繁殖和越冬范围内，西方格里布（Aechmophorus occidentalis）的数量都在下降。我们估计了加拿大格鲁吉亚艾伯塔（Alberta）历史上曾发生过的43个湖泊在2007年至2009年之间的西格里布（Southern Grebe）丰度，并记录了栖息地因素，以（1）将西格里布（Greece）丰度与持久性的相对概率进行比较，（2）确定格里布丰盈。研究区域中，Western Grebe持久性的相对概率与丰度相关，尽管持久性概率变化中只有19％可以用丰度来解释。格里布西部的丰度与出没的芦苇（Scirpus lacustris）的海岸线范围呈正相关，这与过去的研究一致，并强调了在保护西格里布的努力中保护新兴植被的重要性。格里布的丰度与更长的海岸线周长也呈正相关，但与主要在西格里布山脉北部边缘的湖泊上发生的森林后岸量却成反比。沿海开发的数量与西部格里布的丰度成正相关，这可能反映出人类和格里布人偏爱相似的湖泊特征。在实施和管理艾伯塔省Western Grebe的恢复时，必须考虑这些关系。

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