Effects of nutrient reduction and habitat heterogeneity on benthic macroinvertebrate assemblages in a large shallow eutrophic lake.
Effects of nutrient reduction and habitat heterogeneity on benthic macroinvertebrate assemblages in a large shallow eutrophic lake.
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DOI：
10.1016/j.scitotenv.2023.161538
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发表时间：
2023-01
期刊：
影响因子：
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通讯作者：
Zhigang Mao;Yong Cao;Xiaohong Gu;Yongjiu Cai;Huihui Chen;Qingfei Zeng;E. Jeppesen
中科院分区：
文献类型：
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作者：
Zhigang Mao;Yong Cao;Xiaohong Gu;Yongjiu Cai;Huihui Chen;Qingfei Zeng;E. Jeppesen
在过去的几十年里，太湖生态系统遭受了许多人为压力，导致营养动态和栖息地质量发生了巨大变化。例如，西北湖湾接收大量营养丰富的废水，经常出现藻华，而东部湖区仍然以沉水植物为主。这种环境特征的变化可以极大地影响底栖大型无脊椎动物群落。我们利用太湖湖泊生态系统研究实验室收集的15年监测数据来研究底栖无脊椎动物群的时空变化并评估其现状和趋势。我们发现，可以根据分类群组成和丰度来区分三个主要群落，并且它们与三种湖泊生境类型很好地对应：藻类为主、水生植物为主和开放湖区。对时间趋势的分析显示，在研究期间大型无脊椎动物发生了重大变化，这主要是由于全湖范围内耐污染类群的丰度显着下降所致。随机森林回归表明，大型无脊椎动物群落的时空变化主要由营养物质（例如总氮和铵浓度）和生境因素（例如沉积物底物和大型植物生物量）来解释，但三个湖区大型无脊椎动物密度的主要驱动因素在时间尺度上有所不同。此外，我们的研究结果表明，与浮游群落相比，底栖无脊椎动物对湖泊环境条件的改善更为敏感。这项研究提供了有关大型无脊椎动物对湖泊生态动态的反应的见解，并强调了持续监测以跟踪长期变化的重要性。
The Taihu Lake ecosystem has been subjected to numerous anthropogenic stressors during the past decades, leading to substantial changes in nutrient dynamics and habitat quality. For instance, the northwestern lake bays receive large amounts of nutrient-rich wastewater and have frequently experienced algal blooms, while the eastern lake region is still dominated by submersed macrophytes. Such changes in environmental characteristics can greatly impact benthic macroinvertebrate communities. We used a 15-year monitoring data series collected by the Taihu Laboratory for Lake Ecosystem Research to examine the spatial and temporal variations of the benthic invertebrate fauna and evaluate its status and trends. We found that three major communities could be distinguished based on taxonomic group composition and abundance, and these corresponded well with three lake habitat types: algal-dominated, macrophyte-dominated, and open-lake zone. An analysis of temporal trends showed major changes in the macroinvertebrates during the study period, largely driven by a lake-wide and significant decline in the abundance of pollution-tolerant taxa. The spatial and temporal variations of macroinvertebrate communities were mainly explained by nutrients (e.g., total nitrogen and ammonium concentrations) and habitat factors (e.g., sediment substrates and macrophyte biomass) as indicated by Random Forests regression, but the major drivers of macroinvertebrate density differed among the three lake zones at the temporal scale. Moreover, our findings suggest that benthic invertebrates were more sensitive to the improvement of the lake's environmental conditions than the pelagic community was. This study provides insights into the responses of macroinvertebrates to ecological dynamics in lakes and highlights the importance of continued monitoring for tracking long-term changes.