Three ecological factors influencing riverine fish diversity in the Shubuto River system, Japan: Habitat capacity, habitat heterogeneity and immigration
Three ecological factors influencing riverine fish diversity in the Shubuto River system, Japan: Habitat capacity, habitat heterogeneity and immigration
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影响日本周武东河流域河流鱼类多样性的三个生态因素：栖息地容量、栖息地异质性和移民
DOI：
10.1007/s10201-015-0472-5
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发表时间：
2016
期刊：
影响因子：
1.6
通讯作者：
A. & Y. Miyazaki
中科院分区：
文献类型：
--
作者：
Terui;A. & Y. Miyazaki
河流生态学的一个主要目标是确定形成河流群落的环境梯度。我们研究了三个生态因素的相对重要性，这三个因素被假设为影响鱼类多样性的纵向格局：栖息地容量、异质性和迁徙。在日本北海道Shubuto河水系的整个网络中进行了实地调查。等级划分方法表明，离海的距离是代表水栖鱼类迁徙潜力的一个指标，其解释能力最强，可解释鱼类物种丰富度变化的24.9%。生境容量(以集水区面积近似)也被认为是鱼类多样性的重要预测因子，而生境异质性对模型的性能影响不大。这些结果反映了舒布托河水系的鱼类区系，其中水栖鱼类在丰度和物种丰富度上都占主导地位。
A major goal of stream ecology is to identify environmental gradients that shape riverine communities. We examined the relative importance of three ecological factors that have been hypothesized to influence a longitudinal pattern of fish diversity: habitat capacity, heterogeneity and immigration of diadromous fishes. Field surveys were carried out in the entire network of the Shubuto River system, Hokkaido, Japan. A hierarchical partitioning approach revealed that distance from the sea, a proxy for immigration potential of diadromous fishes, had the greatest explanatory capacity, by which 24.9 % of variation in fish species richness was explained. Habitat capacity (approximated by catchment area) was also identified as a significant predictor of fish diversity, whereas habitat heterogeneity brought little improvement to the model performance. These results reflect the fish fauna of the Shubuto River system, in which diadromous fishes are dominant in both abundance and species richness.