Quantifying the top-down effects of grazers on a rocky shore: selective grazing and 1 the potential for competition
Quantifying the top-down effects of grazers on a rocky shore: selective grazing and 1 the potential for competition
复制标题
量化岩石海岸上食草动物自上而下的影响：选择性放牧和 1 竞争潜力
DOI：
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
Mark W. Denny
中科院分区：
文献类型：
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作者：
Diana E. LaScala‐Gruenewald;L. Miller;M. E. Bracken;B. J. Allen;Mark W. Denny
16.食草动物影响初级生产者群落的结构，这17种相互作用的详细情况在陆地生境中已有很好的描述。相比之下，食草动物对它们主要食物来源的多样性、分布和组成的影响很少被描述为岩石海岸的高潮间带，这是研究气候变化潜在影响的模型系统。在加州中部的沿着多岩石、海浪冲刷的海岸，微型底栖植物（MPB）支持帽贝和滨螺的多样性组合，在目前温和的温度下，它们可能以互补的方式分配食物资源，从而提高次级生产力。特别是两种帽贝，Lottia scabra和L.洋地黄，可能分区的MPB的组件，并可能会影响MPB的组成，他们吃草。在这项研究中，我们描述了组成，营养价值（C：N比），和荧光（叶绿素密度指数）的未放牧，L。scabra grazed和L. austrodigitalis放牧MPB组合，27作为温度的函数。荧光减少，平均每日最高温度为未放牧的MPB，但温度没有明显的影响，无论是荧光或29组成的MPB的放牧组合。L. austrodigitalis和L. scabra不划分30个MPB，并且不表现出互补性。这两个物种表现出有序的放牧计划，在31帽贝吃了某些组件的MPB之前，和放牧增加了32 C：N比的MPB，降低其营养价值。这些结果表明L. 33 austrodigitalis和L. scabra可能会经历增加的竞争，因为变暖的温度减少了可用的MPB。利用可变叶绿素荧光原位研究潮间带微型底栖植物。
16 Grazers affect the structure of primary producer assemblages, and the details of these 17 interactions have been well described for terrestrial habitats. By contrast, the effect of grazers on the 18 diversity, distribution, and composition of their principal food source has rarely been described for the 19 high intertidal zone of rocky shores, a model system for studying the potential effects of climate 20 change. Along rocky, wave-swept shores in central California, the microphytobenthos (MPB) supports 21 diverse assemblages of limpets and littorine snails, which, at current benign temperatures, could 22 potentially partition food resources in a complementary fashion, thereby enhancing secondary 23 productivity. Two limpet species in particular, Lottia scabra and L. austrodigitalis , may partition components of the MPB, and are likely to affect the composition of the MPB on which they graze. In 25 this study, we describe the composition, nutritional value (C:N ratio), and fluorescence (an index of 26 chlorophyll density) of ungrazed, L. scabra -grazed and L. austrodigitalis -grazed MPB assemblages, 27 each as function of temperature. Fluorescence decreased with increased average daily maximum 28 temperature for ungrazed MPB, but temperature had no discernible effects on either fluorescence or the 29 composition of the MPB of grazed assemblages. L. austrodigitalis and L. scabra did not partition the 30 MPB, and did not exhibit complementarity. Both species exhibited an ordered grazing scheme, in 31 which limpets grazed down certain components of the MPB before others, and grazing increased the 32 C:N ratio of the MPB, decreasing its nutritional value. Taken together, these results suggest that L. 33 austrodigitalis and L. scabra may experience increased competition as warming temperatures reduce the available MPB. intertidal microphytobenthos as studied in situ using variable chlorophyll fluorescence.
影响因子：
8.8
作者：
Byrnes, J;Stachowicz, JJ;Thornber, CS
通讯作者：
Thornber, CS