• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Conservation Biology >Effects of loss of lateral hydrological connectivity on fish functional diversity
【24h】

Effects of loss of lateral hydrological connectivity on fish functional diversity

机译：横向水文连通性丧失对鱼类功能多样性的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Loss of lateral hydrological connectivity (LHC) is a major cause of biodiversity decline in river floodplains, yet little is known about its effects on aquatic functional diversity in these ecosystems. We quantified functional alpha and beta diversity of fish assemblages in Yangtze River floodplain lakes and explored their responses to loss of LHC with generalized linear mixed models. Functional richness was much lower in lakes that were not connected to the Yangtze River (i.e., disconnected lakes), where functional evenness and divergence were higher. LHC was the most important factor shaping fish diversity patterns in this region. Predicted reductions in functional richness and taxonomic richness due to LHC loss were higher for functional richness (0.47-0.82) than taxonomic richness (0.32) for all species assemblages except nonmigratory species. The distribution of functional strategies of migratory and nonmigratory fishes was highly uneven throughout the floodplain. Taxonomic beta diversity was much higher than functional beta diversity. The former was due mainly to spatial turnover (73.6-83.8%), which suggested that dissimilarity of diversity among fish assemblages was largely induced by species replacement. The latter was induced by the nestedness-resultant component of overall beta diversity (70.7-86.0%), which indicated a high degree of function loss without replacement. Both taxonomic and functional beta diversity were higher in disconnected lakes, where they were significantly correlated with fishing activity and water quality, than in river-connected lakes. We showed for the first time the effects of loss of LHC on fish functional diversity in large river floodplains. We found a serious decline of fish functional richness in the Yangtze floodplain, and functional diversity remained highly vulnerable to loss of LHC even though this is a species-rich ecosystem.
机译：横向水文连通性（LHC）的丧失是河洪泛区的生物多样性下降的主要原因，但它对这些生态系统中的水生学功能多样性的影响很少。我们在长江洪泛省湖泊中量化了鱼组合的功能alpha和β多样性，并通过广义线性混合模型探索了对LHC丧失的反应。湖泊中的功能丰富度低得多，没有连接到长江（即断开的湖泊），其中功能性均匀性和发散程度较高。 LHC是该地区最重要的形状塑造鱼类分集图案。除了非移植物种外，功能丰富度（0.47-0.82）的功能丰富度（0.47-0.82）的功能丰富度（0.47-0.82）的损失较高预测降低较高。迁徙和非物质鱼类功能策略的分布在整个洪泛区中都有高度不均匀。分类β多样性远高于功能β多样性。前者主要是由于空间营业额（73.6-83.8％），这表明鱼类组合中多样性的异化在很大程度上被物种替代诱导。后者被整体β多样性的嵌套组分（70.7-86.0％）诱导，这表明了高度的功能损失而无需更换。分类和功能性β多样性在断开的湖泊中较高，在那里它们与渔业活动和水质显着相关，而不是河连接的湖泊。我们首次展示了LHC损失对大河洪泛平原鱼功能多样性的影响。我们发现在长江洪泛区的鱼类功能丰富性严重下降，即使这是一个丰富的生态系统，功能多样性仍然很容易受到LHC的丧失。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号