Occupied and abandoned structures from ecosystem engineering differentially facilitate stream community colonization
Occupied and abandoned structures from ecosystem engineering differentially facilitate stream community colonization
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生态系统工程中被占用和废弃的结构对溪流群落的殖民化有不同的促进作用
DOI：
10.1002/ecs2.2734
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发表时间：
2019
期刊：
影响因子：
2.7
通讯作者：
Sklar, Leonard S.
中科院分区：
文献类型：
--
作者：
Tumolo, Benjamin B.;Albertson, Lindsey K.;Cross, Wyatt F.;Daniels, Melinda D.;Sklar, Leonard S.
生态系统工程师以促进物种多样性的方式改造栖息地；然而，很少有研究将工程师的短期影响与其工程结构的长期遗留影响分开。我们通过进行包括三种处理的原位实验，研究了网纺石蚕（Hydropsychidae）的初始存在及其提供和改变栖息地的结构如何对源头溪流中的底栖群落定植产生差异性影响：（1）其栖息地改变结构被占据的初始工程生物（以下称为石蚕）； (2)单独初始栖息地改造结构(以下简称丝)； (3) 最初不存在工程师和栖息地改变结构的对照（以下简称对照）。与对照组相比，石蚕和蚕丝处理的无脊椎动物定植总密度和生物量更高（分别约为 25% 和 35%）。然而，更精细的分类模式显示，与蚕丝处理相比，石蚕类群之一摇蚊科的密度高出约 19%。此外，与对照相比，丝处理中的同种生物量平均高出 50%；然而，Hydropsychesp 没有差异。在石蛾处理和对照之间检测到生物量，表明最初废弃的丝结构提高了同种生物量。这些发现表明，在整个实验过程中占据的栖息地改造结构的积极影响可能超过工程师的任何潜在负面影响，众所周知，这是领土性的。重要的是，这些结果表明，工程师本身的最初存在对于维持栖息地改变的生态意义可能很重要。此外，与石蛾处理相比，最初被放弃的栖息地改造（丝绸）对同种生物量具有类似的积极影响，这表明这些工程结构的遗留影响可能具有与占用的栖息地改造相同程度的相关种内反馈。阐明工程师及其栖息地的改变如何对生物体产生不同的促进作用，将使我们能够更清楚地了解动物工程师及其行为对社区组织（例如殖民化）方面的影响程度。
Ecosystem engineers transform habitats in ways that facilitate a diversity of species; however, few investigations have isolated short‐term effects of engineers from the longer‐term legacy effects of their engineered structures. We investigated how initial presence of net‐spinning caddisflies (Hydropsychidae) and their structures that provide and modify habitat differentially influence benthic community colonization in a headwater stream by conducting an in situ experiment that included three treatments: (1) initial engineering organism with its habitat modification structure occupied (hereafter caddisfly); (2) initial habitat modification structure alone (hereafter silk); and (3) a control with the initial absence of both engineer and habitat modification structure (hereafter control). Total invertebrate colonization density and biomass was higher in caddisfly and silk treatments compared to controls (~25% and 35%, respectively). However, finer‐scale patterns of taxonomy revealed that density for one of the taxa, Chironomidae, was ~19% higher in caddisfly compared to silk treatments. Additionally, conspecific biomass was higher by an average of 50% in silk treatments compared to controls; however, no differences inHydropsychesp. biomass were detected between caddisfly treatments and controls, indicating initially abandoned silk structures elevated conspecific biomass. These findings suggest that the positive effects of the habitat modification structures that were occupied for the entirety of the experiment may outweigh any potential negative impacts from the engineer, which is known to be territorial. Importantly, these results reveal that the initial presence of the engineer itself may be important in maintaining the ecological significance of habitat modifications. Furthermore, the habitat modifications that were initially abandoned (silk) had similar positive effects on conspecific biomass compared to caddisfly treatments, suggesting legacy effects of these engineering structures may have pertinent intraspecific feedbacks of the same magnitude to that of occupied habitat modifications. Elucidating how engineers and their habitat modifications differentially facilitate organisms will allow for a clearer mechanistic understanding of the extent to which animal engineers and their actions influence aspects of community organization such as colonization.
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期刊：
影响因子：
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发表时间：
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影响因子：
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作者：
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