Beta Diversity Partitioning and Drivers of Variations in Fish Assemblages in a Headwater Stream: Lijiang River, China

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DOI

  • Liangliang Huang, Guilin University of Technology, Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology
  • ,
  • Jian Huang, Guilin University of Technology, Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology
  • ,
  • Zhiqiang Wu, Guilin University of Technology, China
  • Yuanmin Mo, Guilin University of Technology, China
  • Qi Zou, Guilin University of Technology, China
  • Erik Jeppesen
  • Naicheng Wu, Xi'an Jiaotong-Liverpool University, Kiel University, China

Beta diversity partitioning has currently received much attention in research of fish assemblages. However, the main drivers, especially the contribution of spatial and hydrological variables for species composition and beta diversity of fish assemblages are less well studied. To link species composition to multiple abiotic variables (i.e., local environmental variables, hydrological variables, and spatial variables), the relative roles of abiotic variables in shaping fish species composition and beta diversity (i.e., overall turnover, replacement, and nestedness) were investigated in the upstream Lijiang River. Species composition showed significant correlations with environmental, hydrological, and spatial variables, and variation partitioning revealed that the local environmental and spatial variables outperformed hydrological variables, and especially abiotic variables explained a substantial part of the variation in the fish composition (43.2%). The overall species turnover was driven mostly by replacement (87.9% and 93.7% for Sørensen and Jaccard indices, respectively) rather than nestedness. Mantel tests indicated that the overall species turnover (βSOR and βJAC) and replacement (βSIM and βJTU) were significantly related to hydrological, environmental, and spatial heterogeneity, whereas nestedness (βSNE or βJNE) was insignificantly correlated with abiotic variables (P > 0.05). Moreover, the pure effect of spatial variables on overall species turnover (βSOR and βJAC) and replacement (βSIM and βJTU), and the pure effect of hydrological variables on replacement (βSIM and βJTU), were not important (P > 0.05). Our findings demonstrated the relative importance of interactions among environmental, hydrological, and spatial variables in structuring fish assemblages in headwater streams; these fish assemblages tend to be compositionally distinct, rather than nested derivatives of one another. Our results, therefore, indicate that maintaining natural flow dynamics and habitat continuity are of vital importance for conservation of fish assemblages and diversity in headwater streams.

Original languageEnglish
Article number680
JournalWater
Volume11
Issue4
ISSN2073-4441
DOIs
Publication statusPublished - Apr 2019

    Research areas

  • Abiotic variables, Fish assemblages, Headwater stream, Nestedness, Replacement

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