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Patterns and processes of compositional change in a California epibenthic community

机译：加州表皮动物群落组成变化的模式和过程

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摘要

As human modifications of the earth's systems have increased, so has interest in understanding past changes in order to predict future ecological trajectories. We compared historical (1969-1971) and contemporary (2005-2009) abundances of species in the marine epibenthic community of Bodega Harbor, California, USA. Between these 2 time periods, we found a decrease in the abundance of native species and an increase in non-native dominance, including of several species that were either rare or absent -35 yr ago and whose introduction was likely human-mediated. This compositional shift was concurrent with an increase in local water temperature of～1℃ over the same interval. To address the potential role of ocean warming in facilitating the increase of the new dominant species and maintaining compositional shifts, we evaluated the correlation between temperature and recruitment for 15 species. We found that recruitment timing and magnitude were positively related to temperature for non-native species but not for native species overall. Combined with previous results suggesting effects of ocean warming on the relative performance of native vs. non-native species in this community, our study indicates the potential for continued dominance of non-native species in Bodega Harbor due to local temperature increases. Simultaneously, anthropogenic transport has been responsible for several recent introductions of competitively dominant species, and shifts in contaminant loads or other factors between the 2 time periods could also contribute to compositional shifts, both historically and in the future. Our results highlight the need for studies of these additional factors, as well as the mechanisms underlying their effects on compositional shifts, in order to predict future changes.
机译：随着人类对地球系统的修改的增加，人们对了解过去的变化以预测未来的生态轨迹的兴趣也越来越大。我们比较了美国加利福尼亚州博德加港海洋表生动物群落的历史（1969-1971）和当代（2005-2009）物种的丰富度。在这两个时间段之间，我们发现本地物种的丰度下降而非本地优势的上升，其中包括-35年前罕见或不存在的几种物种，它们的引入很可能是人为介导的。在相同的时间间隔内，这种成分变化与〜1℃的局部水温升高同时发生。为了解决海洋变暖在促进新的优势物种增加和维持组成变化方面的潜在作用，我们评估了15种物种的温度与募集之间的相关性。我们发现，招聘时间和数量与非本地物种的温度呈正相关，但与整个本地物种的温度却没有正相关。结合先前的结果表明海洋变暖对这个社区中本地物种与非本地物种的相对性能的影响，我们的研究表明，由于当地温度升高，在Bodega港口非本地物种继续占主导地位的潜力。同时，人为运输已成为最近引入竞争优势物种的几种原因，并且在两个时期之间污染物负荷或其他因素的变化也可能导致历史和未来的成分变化。我们的结果强调需要研究这些其他因素，以及它们对成分变化影响的潜在机制，以便预测未来的变化。

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  • 来源
    《Marine ecology progress series》 |2011年第22期|p.63-74|共12页
  • 作者

    Cascade J. B. Sorte; John J. Stachowicz;

  • 作者单位

    Department of Evolution and Ecology, University of California, Davis, California 95616, USA,Bodega Marine Laboratory, University of California, Bodega Bay, California 94923, USA,Present address: Department of Environmental, Earth and Ocean Sciences, University of Massachusetts, Boston,Massachusetts 02125, USA;

    Department of Evolution and Ecology, University of California, Davis, California 95616, USA,Bodega Marine Laboratory, University of California, Bodega Bay, California 94923, USA;

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  • 正文语种 eng
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  • 关键词

    invasive species; climate change; ecological forecasting; marine ecology; fouling community;

    机译：入侵物种;气候变化;生态预测;海洋生态学污垢社区;

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