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首页> 外文期刊>Environmental Management >Double-Crested Cormorant (Phalacrocorax auritus) Nesting Effects on Understory Composition and Diversity on Island Ecosystems in Lake Erie
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Double-Crested Cormorant (Phalacrocorax auritus) Nesting Effects on Understory Composition and Diversity on Island Ecosystems in Lake Erie

机译：伊利湖双冠Cor（Ph）巢对底层生态系统组成和多样性的影响

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摘要

The context for this study is the management concerns over the severity and extent of the impact of cormorants on island flora in the recent past on Lake Erie islands. Accordingly, this study sought to quantify the nesting colonies' influence on coarse woody litter and how nest densities and litter depth may influence the herbaceous layer, the seed bank composition and viability across the extent of three Lake Erie islands. The data for this study were collected from 2004 to 2008 on East Sister Island and Middle Island using two main strategies. First, herbaceous layer surveys, cormorant nest counts, soil seed bank cores, and litter depth measurements were executed using a plotless-point quarter method to test island-wide impacts from nesting activities (data were also collected on a third island, West Sister Island as a reference for the other two islands). Secondly, a sub-sample of the entire plot set was examined in particularly high nesting density areas for two islands (Middle Island and East Sister Island). Kruskal-Wallis tests indicated that there are subtle changes in the herbaceous diversity (total, native and exotic) and seed bank composition across the islands. The sub sample set of the plots demonstrated that Phalacrocorax auritus nest density does influence litter depth, herbaceous species abundance and diversity. Cormorant nesting pressures are restricted to areas of high nesting pressures and competition. However, there remains a risk to the interior herbaceous layer of the island if the effects of nesting pressures at the edges advance inward from this perimeter.
机译：这项研究的背景是管理层最近对E伊利湖岛上of对岛上植物区系的影响的严重性和程度的关注。因此，本研究试图量化筑巢殖民地对粗糙木本凋落物的影响，以及巢密度和凋落物深度如何影响伊利湖三个岛屿范围内的草本层，种子库组成和生存力。本研究的数据是使用两种主要策略从2004年至2008年在东姐妹岛和中岛收集的。首先，使用无积点四分之一方法执行草层调查，cor窝数量，土壤种子库核心和垫料深度测量，以测试筑巢活动对全岛的影响（数据还收集在第三座西姐妹岛上作为其他两个岛屿的参考）。其次，在两个岛（中岛和东姐妹岛）的巢密度特别高的区域检查了整个样地集的子样本。 Kruskal-Wallis试验表明，整个岛屿的草本植物多样性（总的，本地的和外来的）和种子库组成都有细微的变化。该样地的子样本集表明，冠ala巢的密度确实会影响凋落物的深度，草本物种的丰度和多样性。的嵌套压力仅限于高嵌套压力和竞争的区域。但是，如果边缘处的嵌套压力从该周边向内前进，则该岛的内部草本层仍然存在风险。

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