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首页> 外文期刊>Ecological indicators >Elevation, aspect, and local environment jointly determine diatom and macroinvertebrate diversity in the Cangshan Mountain, Southwest China
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Elevation, aspect, and local environment jointly determine diatom and macroinvertebrate diversity in the Cangshan Mountain, Southwest China

机译：海拔，纵横比和当地环境共同决定了西南苍山的硅藻和大型无脊椎动物多样性

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Freshwater ecosystems in high-mountain regions are subject to emerging threats such as global warming and expanding human activities. Stream diatoms and macroinvertebrates form an essential component of freshwater ecosystems in high-mountain regions. Although these organisms are sensitive to environmental changes, knowledge regarding their elevational diversity patterns remains limited. Opposite aspects (e.g., north vs south; west vs east) usually receive different amounts of solar radiation and precipitation, leading to distinct in-stream characteristics such as discharge, flow regime, and water temperature. Despite the suggested strong influence of aspect on biodiversity patterns in mountains, its effect on stream diatoms and macroinvertebrates has been largely overlooked. The aims of our study were to 1) investigate whether macroinvertebrate and diatom taxon richness follows the same pattern along an elevational gradient; 2) test the effect of aspect on the elevational diversity (i.e., taxon richness and assemblage dissimilarity) patterns of macroinvertebrate and diatom assemblages; and 3) examine the relative importance of elevation, aspect, and the local environment (e.g., in-stream physicochemical variables) in shaping macroinvertebrate and diatom assemblages. We investigated macroinvertebrate and diatom assemblages in six nearly parallel streams (three streams on the east aspect and three on the west) in the Hengduan Mountains region. We found that the taxon richness of both macroinvertebrates and diatoms showed a monotonic increase with elevation (1623-2905 m a.s.l.) when aspect was not accounted for. When aspect was taken into consideration, macroinvertebrate taxon richness still showed a monotonically increasing elevational pattern on both the east and west aspects, but with significantly different model slopes, while a monotonical pattern for diatoms only remained on the west aspect. In addition, taxon richness of macroinvertebrates may also follow a potential unimodal pattern. The distance-decay relationships followed the same patterns as taxon richness, suggesting that the influence of aspect on diatom and macroinvertebrate assemblages was not negligible. Our results suggested that the diversity of both diatoms and macroinvertebrates was jointly determined by elevation, aspect and local environment. Compared to macroinvertebrates, the diatom assemblages were more strongly influenced by the local environment. To gain a better understanding of the underlying mechanisms driving elevational patterns of stream biodiversity in high-mountain regions, comparative studies that involve multiple organisms, streams, and mountains across a large elevational range are needed.
机译：高山地区的淡水生态系统正面临新的威胁，例如全球变暖和人类活动的扩大。河流硅藻和大型无脊椎动物是高山地区淡水生态系统的重要组成部分。尽管这些生物对环境变化敏感，但有关其海拔多样性模式的知识仍然有限。相反的方面（例如，北与南；西与东）通常会接收到不同量的太阳辐射和降水，从而导致不同的流内特征，例如流量，流态和水温。尽管建议方面对山区生物多样性模式有强烈影响，但它对溪流硅藻和大型无脊椎动物的影响却被大大忽略了。我们的研究目的是：1）研究大型无脊椎动物和硅藻类群的丰富度是否沿着海拔梯度遵循相同的模式； 2）测试长宽比对大型无脊椎动物和硅藻组合的海拔多样性（即分类群丰富度和组合不相似性）模式的影响;和3）检查在塑造大型无脊椎动物和硅藻组合物中，海拔，纵横比和当地环境（例如，河流中的物理化学变量）的相对重要性。我们调查了横断山脉地区的6条近乎平行的水流（东边3条，西边3条）的大型无脊椎动物和硅藻组合。我们发现，当不考虑长宽比时，大型无脊椎动物和硅藻的分类生物丰富度均随海拔升高（1623-2905 m a.s.l.）而单调增加。当考虑到方面时，大型无脊椎动物分类单元的丰富度在东西方都仍然显示出单调递增的高程模式，但是模型坡度有明显不同，而硅藻的单调模式只保留在西部方面。此外，大型无脊椎动物的分类群丰富度也可能遵循潜在的单峰模式。距离-衰减关系遵循与分类单元丰富度相同的模式，表明长宽比对硅藻和大型无脊椎动物组合的影响不可忽略。我们的研究结果表明，硅藻和大型无脊椎动物的多样性是由海拔，纵横比和当地环境共同决定的。与大型无脊椎动物相比，硅藻的组合受当地环境的影响更大。为了更好地了解在高山地区驱动河流生物多样性海拔模式的潜在机制，需要进行涉及较大海拔范围内多种生物，河流和山脉的比较研究。

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