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首页> 外文期刊>River Research and Applications >MASSIVE GROWTH OF THE INVASIVE ALGAE DIDYMOSPHENIA GEMINATA ASSOCIATED WITH DISCHARGES FROM A MOUNTAIN RESERVOIR ALTERS THE TAXONOMIC AND FUNCTIONAL STRUCTURE OF MACROINVERTEBRATE COMMUNITY
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MASSIVE GROWTH OF THE INVASIVE ALGAE DIDYMOSPHENIA GEMINATA ASSOCIATED WITH DISCHARGES FROM A MOUNTAIN RESERVOIR ALTERS THE TAXONOMIC AND FUNCTIONAL STRUCTURE OF MACROINVERTEBRATE COMMUNITY

机译：与山水库排泄物相关的入侵性藻类重生藻的大量生长，说明了无脊椎动物社区的分类学和功能结构

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摘要

The objective of this paper is to determine the alteration of the taxonomic composition and functional structure of macroinvertebrate community associated with a massive growth of the invasive algae Didymosphenia geminata downstream of a mountain reservoir (Pajares Reservoir, La Rioja, Northern Spain). As the massive growth of the alga disappears a few kilometres downstream of the reservoir associated with the input of nutrients from a nearby village sewage, we may compare the community composition between nine stations in three different conditions: three stations heavily affected by the presence of D. geminata, three further downstream stations without the algal massive growth but affected by river regulation and three control stations (unregulated and without the algae). Results show a significant disturbance of the composition and structure of macroinvertebrate community in sites affected by the stream flow regulation downstream of the dam compared with unregulated streams, but the alterations are more dramatic in the area where the growth of D. geminata is massive because of the total substrate occupation by the algal filaments. Scrapers and others invertebrates living on the coarse substrate are especially affected at such sites. Moreover, an important increase in the relative abundance of chironomids is associated with the algal massive growth, especially in case of Eukiefferiella devonica and Cricotopus spp., reducing the assemblage diversity and leading to the taxonomic and functional homogenization of the community. Changes in the reservoir management (such as releasing the water from surface rather than from the hypolimnion) may be useful to control the massive growth of D. geminata and thus reducing the effects of river regulation on macroinvertebrate assemblage composition.
机译：本文的目的是确定与大型无脊椎动物群落的分类学组成和功能结构的变化，该变化与山区水库（西班牙北部拉里奥哈的帕哈雷斯水库）下游侵入性藻类Didymosphenia geminata的大量生长有关。由于藻类的大量生长在水库下游几公里处消失，与附近村庄污水中养分的输入有关，我们可以比较三种情况下九个站点之间的群落组成：三个受D严重影响的站点Geminata，另外三个下游站，没有藻类大量生长，但是受到河流调节和三个控制站（不受调节，没有藻类）的影响。结果表明，与不受管制的河流相比，受大坝下游水流调节影响的地点的大型无脊椎动物群落的组成和结构受到了严重干扰，但由于双子叶D的大量生长，其变化更为明显。藻丝占据的总底物。居住在粗糙基底上的刮板和其他无脊椎动物在这些地方尤其受到影响。此外，手足类动物的相对丰度的重要增加与藻类的大量生长有关，特别是在Eukiefferiella devonica和Cricotopus spp。的情况下，减少了种群多样性并导致了群落的分类学和功能同质化。水库管理的变化（例如从表层而不是从次水层中释放水）可能对控制双歧线虫的大量生长很有用，从而减少了河流调节对大型无脊椎动物组合物的影响。

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