Hydraulic habitat use with respect to body size of aquatic insect larvae: Case of six species from a French Mediterranean type stream
Hydraulic habitat use with respect to body size of aquatic insect larvae: Case of six species from a French Mediterranean type stream
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水生昆虫幼虫体型的水生栖息地利用：来自法国地中海型溪流的六种物种的案例
DOI：
10.1016/j.limno.2007.09.002
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发表时间：
2008
期刊：
影响因子：
1.7
通讯作者：
Nicolas Péru
中科院分区：
文献类型：
--
作者：
P. Sagnes;S. Mérigoux;Nicolas Péru
大型无脊椎动物在海洋生态系统中发挥着关键作用，因为鱼类捕食和处理有机物质。因此，它们的水力偏好必须整合在生态溪流管理的instantly栖息地模型。本研究的特点是物理栖息地使用的剪切速度为三个蜉蝣目（Ephoron处女座，Oligoneuriella的，和Serratella ignita），两个毛翅目（Chepiopsyche lepida和Hydropsyche exocellata）和双翅目物种（Blepharicera fasciata）在地中海流在一个相对较低的水排放量的幼虫。O.拉加纳角lepida、H. exocellata和B. fasciata幼虫主要出现在高剪切速度条件下，而E. virgo和S.在低剪切速度条件下发现ignita幼虫。知道栖息地的偏好应在个体发育过程中（例如，在生物需求和/或形态能力的变化，以承受高流量），我们的第二个目标是表征不同的水力栖息地的使用（剪切速度方面）的差异，这六个物种的不同大小的类。拉尔森的H. exocellata和B.条带绦虫主要在高剪切速度条件下定殖，这些种类的许多个体也使用中等剪切速度条件，与大小级无关。高剪切速度条件的使用随着幼虫大小的增加而增加。lepida和O.而低剪切速度条件的使用增加了较大的E. virgo和S. ignita.提出了各种假说来解释这些不同的策略，在个体发育的栖息地使用。我们指出，缺乏知识的物理栖息地的变化，在淡水无脊椎动物的幼虫生长。这些结果突出的兴趣，考虑各自的栖息地要求不同大小的类的无脊椎动物在昆虫栖息地模型。人口瓶颈应克服，如果水力条件保持适合所有大小类的流管理。
Macroinvertebrates play a key role in lotic ecosystems, as fish prey and processors of organic material. Therefore, their hydraulic preferences have to be integrated in instream habitat models for ecological stream management. This study characterized physical habitat use in terms of shear velocity for the larvae of three Ephemeropteran (Ephoron virgo, Oligoneuriella rhenana, and Serratella ignita), two Trichopteran (Cheumatopsyche lepida and Hydropsyche exocellata) and one Dipteran species (Blepharicera fasciata) in a Mediterranean stream at a relatively low water discharge. O. rhenana, C. lepida, H. exocellata, and B. fasciata larvae were mainly found in high shear velocity conditions, whereas E. virgo and S. ignita larvae were found in low shear velocity conditions. Knowing that habitat preferences should vary during ontogenesis (with respect to changes in biological requirements and/or morphological abilities to withstand high flow, for example), our second objective was to characterize differences in the hydraulic habitat use (in terms of shear velocity) for different size classes of these six species. Larvae of H. exocellata and B. fasciata mainly colonized high shear velocity conditions and numerous individuals of these species also used medium shear velocity conditions, independent of size class. The use of high shear velocity conditions increased with larval size for C. lepida and O. rhenana, whilst the use of low shear velocity conditions increased for larger larvae of E. virgo and S. ignita. Various hypotheses are proposed to explain these different strategies of habitat use during ontogenesis. We point out the lack of knowledge about physical habitat shifts during the larval growth of freshwater invertebrates. These results highlight the interest to consider the respective habitat requirements of different size classes of invertebrates in instream habitat models. Population bottlenecks should be overcome if hydraulic conditions are kept suitable for all size classes by stream managers.