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首页> 外文期刊>Southeastern naturalist >Annual Survival of Birds Captured in a Habitat Island Bordered by the Urban Matrix of Baton Rouge, LA
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Annual Survival of Birds Captured in a Habitat Island Bordered by the Urban Matrix of Baton Rouge, LA

机译：在栖息地岛屿中捕获的鸟类的年度生存情况，该岛屿与洛杉矶巴吞鲁日的城市矩阵相邻

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Urban habitat fragments may provide birds the resources necessary to sustain viable populations in close proximity to human settlement. Conversely, urban habitat fragments may also act as ecological traps, where birds are lured into habitats that negatively affect reproduction or survival. In this study, we compared annual survival estimates of six common resident bird species captured at Bluebonnet Swamp, a 41.7-ha forest fragment bordered by the urban matrix of Baton Rouge, LA, with values derived from the Institute for Bird Populations’ MAPS program to determine if populations sampled in the habitat fragment demographically deviated from regional baseline estimates. We found that three species captured at Bluebonnet Swamp exhibited survival estimates consistent with regional averages, whereas Cardinalis cardinalis (Northern Cardinal), Toxostoma rufum (Brown Thrasher), and Poecile carolinensis (Carolina Chickadee) survival estimates were lower than baseline. Edge effects associated with a relatively small preserve coupled with disease and semiannual movements in and out of the study area may be influencing Cardinal and Thrasher survival. We recommend that other studies focus on measuring avian demographics within habitat fragments to identify and mitigate factors that limit population sustainability in human-modified landscapes, as relative density alone may not be an appropriate metric for understanding the value of habitat fragments to birds.
机译：城市栖息地碎片可能为鸟类提供维持人类住区附近可行种群所需的资源。相反，城市栖息地碎片也可以充当生态陷阱，诱使鸟类进入对繁殖或生存产生负面影响的栖息地。在这项研究中，我们将在Bluebonnet沼泽（一个41.7公顷的森林片段，以洛杉矶的巴吞鲁日的城市边界为边界）中捕获的六种常见鸟类的年度生存估计与鸟类种群研究所的MAPS计划得出的值进行了比较确定在栖息地片段中抽样的人口是否在人口统计学上偏离区域基线估计。我们发现，在矢车菊沼泽捕获的三个物种的生存估计与区域平均值一致，而Cardinalis cardinalis（北红衣主教），Toxostoma rufum（褐Thrasher）和Poecile carolinensis（Carolina Chickadee）的生存估计均低于基线。与相对较小的保存区相关的边缘效应，以及疾病和研究区域内外的半年移动可能会影响红衣主教和Thrasher的生存。我们建议其他研究集中在测量栖息地片段内的鸟类人口统计特征，以识别和缓解限制人类改造景观中种群可持续性的因素，因为单独的相对密度可能不是了解栖息地片段对鸟类的价值的合适指标。

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