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首页> 外文期刊>Marine & freshwater research >Response of stream invertebrate communities to vegetation damage from overgrazing by exotic rabbits on subantarctic Macquarie Island
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Response of stream invertebrate communities to vegetation damage from overgrazing by exotic rabbits on subantarctic Macquarie Island

机译：亚热带Macquarie岛上溪流无脊椎动物群落对外来兔过度放牧对植被破坏的响应

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摘要

Widespread damage to vegetation on an isolated oceanic island (Macquarie Island), due to overgrazing (since 2002) by an expanding exotic rabbit population, could affect the nature of catchment runoff and result in changes to stream habitats and the composition of their invertebrate communities. To test this hypothesis, stream invertebrate communities that had been sampled originally in 1992 (at 15 sites when rabbit numbers were historically low), were re-sampled in 2008 (17 sites) and in 2010 (12 sites). The number of taxa recorded at each site was 25-36% lower in 2008 (7.4 taxa per site) and in 2010 (8.7 taxa) than in 1992 (11.6 taxa) and an abundance index showed a substantial decline across most taxa. Ordination indicated that composition at all sites changed markedly between years. The greatest compositional changes occurred at sites exposed to moderate or severe levels of vegetation damage, suggesting that stream invertebrates responded to habitat changes associated with increased grazing. An altered input of organic material into the streams as a result of vegetation damage may have been responsible. If communities of stream invertebrates on isolated islands are degraded, then composition may be altered permanently, unless refuges are available.
机译：自2002年以来，由于不断扩大的外来兔子种群过度放牧，对一个孤立的海洋岛（麦夸里岛）的植被造成了广泛的破坏，这可能会影响流域径流的性质，并导致河流生境及其无脊椎动物群落组成的变化。为了检验该假设，最初于1992年（在兔子数量历史低位的15个地点）采样的溪流无脊椎动物群落在2008年（17个地点）和2010年（12个地点）进行了重新采样。与1992年（11.6个分类单元）相比，2008年（每个站点7.4个分类单元）和2010年（8.7个分类单元）在每个站点记录的分类单元数量减少了25-36％，并且大多数分类单元的丰度指数均大幅下降。整理表明，所有站点的组成在几年之间发生了显着变化。最大的组成变化发生在遭受中等或严重植被破坏的地点，这表明河流无脊椎动物对与放牧增加有关的栖息地变化做出了反应。由于植被破坏而导致有机物向河流中的输入变化可能是造成这种情况的原因。如果孤立的岛屿上的河流无脊椎动物群落退化，那么除非有庇护所，否则其组成可能会永久改变。

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