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首页> 外文期刊>Aquatic Sciences >Evidence for ecosystem engineering in a lentic habitat by tadpoles of the western toad
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Evidence for ecosystem engineering in a lentic habitat by tadpoles of the western toad

机译：西部蟾蜍t在透镜状生境中进行生态系统工程研究的证据

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摘要

A number of aquatic organisms have demonstrated an ability to modulate sediment deposition in tropical and temperate stream systems, but little is known about the impact of similar benthic grazing processes in temperate pond systems. Using exclosure experiments in mesocosms, we used tadpoles of the western toad (Anaxyrus boreas) to investigate two questions: (1) can grazing activities of tadpoles of the western toad in ponds reduce sediment accrual on grazing surfaces (e.g. via bioturbation or ingestion); and (2) do these grazing activities contribute to enhanced periphyton biomass and chlorophyll a content of benthic matter. Mesocosms received pulses of fine sediment weekly over 8 weeks to simulate allochthonous surface inputs following rainstorms. Accumulated sediment and periphyton matter on exposed and grazing-restricted substrate surfaces were measured weekly. Tadpole grazing activity significantly reduced the standing stock of periphyton on open grazing surfaces by 80% in controls. Under sediment-additions, tadpoles effectively removed settled particulate matter from exposed grazing surfaces, but no corresponding increase in periphyton biomass was observed. These results suggest that tadpoles can impact the dynamics of sediment distribution in ponds as well as streams, providing support for a role as "ecosystem engineers" in these habitats.
机译：许多水生生物已显示出调节热带和温带水流系统中沉积物沉积的能力，但对温带池塘系统中类似底栖放牧过程的影响知之甚少。通过中膜的暴露实验，我们使用了西部蟾蜍的Ana（Anaxyrusboras）来研究两个问题：（1）池塘中西部蟾蜍的gra的放牧活动是否可以减少放牧表面上的沉积物累积（例如通过生物扰动或摄食）; （2）这些放牧活动是否有助于增加底栖生物的周生生物量和叶绿素a含量。在暴雨过后的八周内，中膜每周都会收到细小沉积物的脉冲，以模拟异源地表的输入。每周测量暴露的和限制吃草的底物表面上的沉积物和附生植物物质的积累。 controls放牧活动使对照中开放放牧表面上的浮游动物的立草量显着降低了80％。在添加沉积物的情况下，t有效地从暴露的放牧表面清除了沉降的颗粒物，但未观察到相应的围生生物量增加。这些结果表明，can可以影响池塘和溪流中沉积物分布的动力学，从而为这些生境中作为“生态系统工程师”的角色提供了支持。

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  • 来源
    《Aquatic Sciences》 |2010年第4期|p.499-508|共10页
  • 作者

    Sylvia L. R. Wood; John S. Richardson;

  • 作者单位

    Department of Forest Sciences, University of British Columbia, 3041-2424 Main Mall, Vancouver, BC V6T1Z4, Canada Department of Geography, McGill University, 509-850 Sherbrooke St.West, Montreal, QC H3A2K6, Canada;

    rnDepartment of Forest Sciences, University of British Columbia, 3041-2424 Main Mall, Vancouver, BC V6T1Z4, Canada;

  • 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

    anaxyrus boreas; ponds; benthic grazing; sediment; mesocosm;

    机译：甲虫池塘底栖放牧沉淀;中观;

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