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首页> 外文期刊>Journal of arid environments >The importance of plant cover and predation in shaping a desert community
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The importance of plant cover and predation in shaping a desert community

机译：植物覆盖和捕食对塑造沙漠社区的重要性

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摘要

The classical paradigm describe desert communities as being controlled by abiotic conditions and therefore it was assumed that predation had a limited role in the determination of desert community structure and that only one effective trophic level was expected. In the Negev desert, the desert isopod (Hemilepistus raeumuri) is common in the less productive habitats but almost absent from the more productive wadis. In the present study we tested whether predation by ectothermic predators has a role in controlling isopod populations in wadis. We hypothesized that plant cover provides a refuge for these predators from secondary endothermic predators. We addressed this hypothesis by comparing isopod survivorship with and without predation exclusion, and with and without plant cover removal. Isopods protected from predation had a sustainable population whereas unprotected isopods had an unsustainable sink population. Removal of plant cover did not affect the survivorship of predator-protected isopods, however it did increase the survivorship and reduced predation pressure when not protected from predators, for at least four years. Hence, we conclude that predation controls isopod population and causes an unsustainable sink population in wadis. We have shown that plant cover mediates predation and that some habitats in the desert have an effective third trophic level, suggesting that energy is not the major limiting factor in determining the length of food chains. (C) 2016 Elsevier Ltd. All rights reserved.
机译：经典范式将沙漠群落描述为受非生物条件控制，因此，假定掠夺在确定沙漠群落结构中的作用有限，并且预期只有一个有效的营养水平。在内盖夫沙漠中，沙漠等足动物（Hemilepistus raeumuri）在生产力较低的栖息地中很常见，而在生产力较高的旱谷中却几乎没有。在本研究中，我们测试了外热掠食者的捕食是否在控制wadis中的等足动物种群中起作用。我们假设植物覆盖物为这些吸食者提供了庇护，使其免受次级吸热捕食者侵害。我们通过比较有和没有捕食被捕以及有和没有被捕植物盖的等足动物生存来解决这个假设。受保护免于捕食的等足动物的种群可持续，而不受保护的等足动物的库种群不可持续。去除植物覆盖物不会影响被捕食者保护的等足动物的存活，但是在至少四年内，如果没有受到捕食者的保护，它确实增加了存活率并降低了捕食压力。因此，我们得出的结论是，捕食控制了等足动物种群，并导致了wadis中不可持续的汇聚种群。我们已经表明，植物覆盖作用介导了捕食，并且沙漠中的某些栖息地具有有效的第三营养级，这表明能量不是决定食物链长度的主要限制因素。 （C）2016 Elsevier Ltd.保留所有权利。

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  • 来源
    《Journal of arid environments》 |2016年第12期|33-38|共6页
  • 作者

    Segoli Moran; Groner Elli; Ayal Yoram;

  • 作者单位

    Ben Gurion Univ Negev, Mitrani Dept Desert Ecol, BIDR, Sede Boker Campus, IL-84990 Sede Boqer, Israel|Ramat Negev Desert Agrores Ctr, Negev, Israel;

    Ben Gurion Univ Negev, Mitrani Dept Desert Ecol, BIDR, Sede Boker Campus, IL-84990 Sede Boqer, Israel|Dead Sea & Arava Sci Ctr, Mizpe Ramon, Israel;

    Ben Gurion Univ Negev, Mitrani Dept Desert Ecol, BIDR, Sede Boker Campus, IL-84990 Sede Boqer, Israel;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Community structure; Desert; Food-web; Macrodetritivores; Ectothermic predators;

    机译：群落结构;沙漠;食物网;巨噬动物;放热捕食者;

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