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首页> 外文期刊>Ecological research >Determinants of the re-occupation and size of Grey Heron Ardea cinerea breeding colonies in northern Poland
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Determinants of the re-occupation and size of Grey Heron Ardea cinerea breeding colonies in northern Poland

机译：波兰北部灰鹭Ardea cinerea繁殖种群重新占据和规模的决定因素

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Birds select habitats on the basis of structural characteristics, food and nest-site availability or other features that affect survival and reproduction. This study investigates factors influencing colony re-occupation, the number of nests in 2013 and changes in the numbers of nest between 2004 and 2013 in re-occupied colonies of Grey Herons Ardea cinerea in northern Poland. The effects of following features around every colony were analysed: area of hydrographic and habitat features, habitat patchiness and microscale features. Among 28 colonies occupied in 2004, 43 % were re-occupied in 2013. Logistic regression models revealed that models with greater area of the sea coastline zone and lower area of the water body shoreline zone and also small number of pastures determined the best colony re-occupation. Only models with an area of water bodies and a number of pastures were significant, suggesting the important influence of other non-habitat factors on colony re-occupation. Ordinary least square (OLS) regression analysis revealed that in re-occupied colonies the number of nests in 2013 was higher in heronries with greater area of sea coastline zone, smaller number of forest patches and shorter distance to the nearest road. OLS regression analysis revealed that the number of nests increased between 2004 and 2013 in the colonies with greater areas covered by forests, greater number of water bodies, shorter distance to the rivers and longer distance to the sea. Our study revealed the importance of wetland habitat features to colony re-occupation, its size and changes in size.
机译：鸟类根据结构特征，食物和巢位的可用性或其他影响生存和繁殖的特征来选择栖息地。这项研究调查了波兰北部灰鹭Ardea cinerea的再占领殖民地中影响殖民地重新居住，2013年巢穴数量以及2004年至2013年之间巢穴数量变化的因素。分析了每个殖民地以下特征的影响：水文面积和栖息地特征，栖息地斑块和微观特征。在2004年占领的28个殖民地中，2013年重新占据了43％。Logistic回归模型显示，海洋海岸线区域面积较大，水体海岸线区域面积较小且牧场数量较少的模型确定了最佳的殖民地。 -占用。只有具有水体面积和许多牧场的模型才有意义，表明其他非栖息地因素对殖民地的重新占有具有重要影响。普通最小二乘（OLS）回归分析显示，2013年，在被重新占领的殖民地中，鹭鹭的巢穴数量更多，沿海海岸线面积更大，森林斑块数量更少且距最近道路的距离较短。 OLS回归分析显示，在2004年至2013年期间，森林覆盖面积更大，水体数量更多，与河流的距离更短，与海洋的距离更长的殖民地的巢穴数量有所增加。我们的研究揭示了湿地栖息地特征对殖民地重新占领，其大小和大小变化的重要性。

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