Biological traits of diatoms in the characterization of a reservoir and a stream in a subtropical region
Biological traits of diatoms in the characterization of a reservoir and a stream in a subtropical region
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亚热带地区水库和河流特征中硅藻的生物学特性
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
T. A. Ludwig
中科院分区：
文献类型：
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作者：
V. M. Algarte;Gracielle Pavan;F. Ferrari;T. A. Ludwig
从不同的分类水平（种、属、科）和生物学性状（对底物的附着策略）对水库和河流附生硅藻群落结构进行了研究。我们预计，强附着硅藻将在流中大量存在，而松散附着硅藻将在储层中占主导地位，因为水流条件较慢。在相同的分布模式下，对该物种的高分类水平和生物学性状的一致性进行了评估和检验。我们的假设是，分类水平和生物学性状与物种群落具有高度的一致性。由于外植硅藻具有特殊的底物定殖结构，我们认为生物性状组与物种之间的一致性比由分类水平形成的组更大。事实上，我们观察到强依附策略在水生环境中普遍存在，而潜行、匍匐、游动和浮游策略在水库中占主导地位。两种环境下物种与生物学性状的一致性均高于不同分类水平下的一致性。这些结果表明，依恋策略是影响物种发生和分布的关键因素。依附策略在不稳定环境条件下比松散依附策略表现出更大的竞争优势，而松散依附策略在稳定环境条件下占主导地位。我们的研究结果表明，硅藻群落与环境条件密切相关，并表明生物性状可能是表征环境的另一种选择。
The structure of epiphytic diatom communities in a reservoir and a stream were studied with regard to different taxonomic levels (species, genera, and families) and biological traits (strategies of attachment to the substrate). We expected that strongly attached diatoms would abound in the stream, and those employing a loosely attached strategy should predominate in the reservoir due to the lentic flow condition. The congruence of high taxonomic levels and biological traits of the species was assessed and tested against an equal pattern of distribution. Our hypothesis was that taxonomic levels and biological traits have high congruence with species community. As periphytic diatoms have specialized structures to colonize substrates, we believed biological trait groups would show greater congruence with the species than groups formed by taxonomic levels. In fact, we observed the prevalence of strongly attached strategies in the lotic environment and stalked, prostrate, motile, and planktonic strategies predominated in the reservoir. The congruence between species and biological traits was stronger in both environments than that with different taxonomic levels. These results suggest that the strategies of attachment represent a key factor to the occurrence and distribution of species. The attached strategy showed greater competitive advantages under unstable environmental conditions than the loosely attached strategy, which predominated under stable conditions. Our results demonstrated a strong association of the diatom community with environmental conditions and suggest that biological traits may be an additional alternative for characterizing environments.