PDF(Pubmed)
Abstract：
Lake ecosystems confront escalating challenges to their stability and resilience, most intuitively leading to biodiversity loss, necessitating effective preservation strategies to safeguard aquatic environments. However, the complexity of ecological processes governing lake biodiversity under multi-stressor interactions remains an ongoing concern, primarily due to insufficient long-term bioindicator data, particularly concerning macroinvertebrate biodiversity. Here we utilize a unique, continuous, and in situ biomonitoring dataset spanning from 2011 to 2019 to investigate the spatio-temporal variation of macroinvertebrate communities. We assess the impact of four crucial environmental parameters on Lake Dongting and Lake Taihu, i.e., water quality, hydrology, climate change, and land use. These two systems are representative of lakes with Yangtze-connected and disconnected subtropical floodplains in China. We find an alarming trend of declining taxonomic and functional diversities among macroinvertebrate communities despite improvements in water quality. Primary contributing factors to this decline include persistent anthropogenic pressures, particularly alterations in human land use around the lakes, including intensified nutrient loads and reduced habitat heterogeneity. Notably, river-lake connectivity is pivotal in shaping differential responses to multiple stressors. Our results highlight a strong correlation between biodiversity alterations and land use within a 2-5 km radius and 0.05-2.5 km from the shorelines of Lakes Dongting and Taihu, respectively. These findings highlight the importance of implementing land buffer zones with specific spatial scales to enhance taxonomic and functional diversity, securing essential ecosystem services and enhancing the resilience of crucial lake ecosystems.
摘要：
湖泊生态系统面临着对其稳定性和复原力不断升级的挑战，最直观地导致生物多样性丧失，需要有效的保护策略来保护水生环境。然而,在多种压力源相互作用下，控制湖泊生物多样性的生态过程的复杂性仍然是一个持续关注的问题，主要是由于长期生物指标数据不足，特别是关于大型无脊椎动物的生物多样性。在这里，我们利用一个独特的，连续,和2011年至2019年的原位生物监测数据集，以调查大型无脊椎动物群落的时空变化。我们评估了四个关键环境参数对洞庭湖和太湖的影响，即，水质,水文学,气候变化,和土地使用。这两个系统代表了中国与长江相连和不相连的亚热带洪泛区的湖泊。尽管水质有所改善，但我们发现大型无脊椎动物群落的分类和功能多样性下降的趋势令人震惊。造成这种下降的主要因素包括持续的人为压力，特别是湖泊周围人类土地利用的改变，包括强化的营养负荷和减少的栖息地异质性。值得注意的是,河湖连通性在塑造对多种压力源的差异反应方面至关重要。我们的研究结果表明，在距离洞庭湖和太湖海岸线2-5公里半径和0.05-2.5公里的范围内，生物多样性改变与土地利用之间存在很强的相关性。分别。这些发现强调了实施具有特定空间尺度的土地缓冲区以增强分类学和功能多样性的重要性，确保必要的生态系统服务并增强关键湖泊生态系统的复原力。
