Ecological effects of dams, alien fish, and physiochemical environmental factors on homogeneity/heterogeneity of fish community in four tributaries of the Pearl River in China

作者：Lei Zeng, Lei Zhou, Dingli Guo, Dong‐Hua Fu, Peng Xu, Shuang Zeng, Qindong Tang, An‐Luo Chen, Fangyan Chen, Yong Luo, Guifeng Li · 发表于：Ecology and Evolution · 年份：2017 · DOI：10.1002/ece3.2920 · 被引用次数：34 · 研究领域：Fish Ecology and Management Studies、Fish Biology and Ecology Studies、Fish biology, ecology, and behavior

Abstract In this study, we aimed to characterize the fish community structure and identify the drivers contributing to homogenization/differentiation processes in four tributaries to the Pearl River, Guangxi Province, China, over the past few decades. We sampled 22 sites seasonally from 2013 through 2015, and these sites were selected based on archived records of previous sampling conducted in the 1980s. Jaccard's faunal similarity index, cluster analysis, and canonical correspondence analysis ( CCA ) were applied to describe the homogenization/differentiation of fish community and illustrate the potential effectors. The number of fish species present in three of the four sampled tributaries declined dramatically over the past 30 years, leading toward a trend of increased fish community homogeneity throughout the watershed. Results from multidimensional scaling and cluster analyses allowed us to divide the study area into two distinct ecoregions. Four species ( yellow catfish Pelteobagrus fulvidraco , pond loach Misgurnus anguillicaudatus , Nile tilapia Oreochromis niloticus , and sharpbelly Hemiculter leucisculus ) were considered to be indicative fish species contributing more than 5% of the dissimilarity between the two eco‐regions according to the results of similarity percentage procedure. Results from CCA revealed that pH and latitude corresponded with the dominant fish species of each respective tributary. More specifically, CCA results allowed us to classify dominant ...