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首页> 外文期刊>The American Midland Naturalist >Reproductive Success and Habitat Selection in Black-crowned Night-Herons (Nycticorax nycticorax) in a City Park
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Reproductive Success and Habitat Selection in Black-crowned Night-Herons (Nycticorax nycticorax) in a City Park

机译：黑冠夜鹭（Nycticorax nycticorax）在城市公园中的繁殖成功和生境选择

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摘要

Black-crowned Night-Herons (BCNH; Nycticorax nycticorax) increasingly colonize urban areas, demonstrating they consider the value of such habitat to outweigh the risks. However it is unclear if cities support reproductively successful populations of BCNH. To begin to address this question, I evaluated if a park in Chicago, Illinois, provided suitable breeding habitat or was an ecological trap for a colony of approximately 400 BCNH. Nest densities were 217 nests/ha in 2010 and 315 nests/ha in 2011, which were higher than nest densities observed in North American BCNH colonies in natural habitats. Ratios of young to active nests were 1.22 in 2010 and 0.76 in 2011, similar to ratios observed in nearby BCNH colonies. Within the park BCNH selected between two neighboring habitat patches. Logistic regression was used to predict habitat patch selection as a function of colony size and year. In the model the probability of selecting a larger, more exposed habitat patch versus a smaller, more secluded habitat patch, increased with colony size. This trend in habitat patch selection demonstrated behavioral flexibility which may have facilitated successful colonization of a human-modified landscape. The findings support the conclusion that in 2010 and 2011, an urban park in Chicago supported a locally endangered BCNH population and was not an ecological trap.
机译：黑冠夜鹭（BCNH; Nycticorax nycticorax）越来越多地殖民城市地区，这表明他们认为这种栖息地的价值超过了风险。但是，尚不清楚城市是否支持BCNH繁殖成功的人口。为了解决这个问题，我评估了伊利诺伊州芝加哥市的公园是否提供了合适的繁殖栖息地，或者是大约400 BCNH殖民地的生态陷阱。巢密度在2010年为217巢/公顷，2011年为315巢/公顷，高于自然栖息地在北美BCNH殖民地中观察到的巢密度。幼巢与活动巢的比例在2010年为1.22，在2011年为0.76，与附近BCNH殖民地的比例相似。在公园内，BCNH在两个相邻的栖息地斑块之间进行选择。 Logistic回归用于预测栖息地斑块选择与菌落大小和年份的关系。在模型中，选择更大，更裸露的栖息地斑块与较小，更隐蔽的栖息地斑块的概率随菌落大小而增加。栖息地斑块选择的这种趋势显示出行为上的灵活性，这可能促进了人类改造景观的成功定殖。这些发现支持以下结论：2010年和2011年，芝加哥的城市公园为当地濒临灭绝的BCNH人口提供了支持，这不是生态陷阱。

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