Zhang Junqian, Song Zhuoyan, Li Zhengfei, Yang Jiali, Xie Zhicai
State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology Chinese Academy of Sciences Wuhan China.
Great Lakes Institute for Environmental Research University of Windsor Windsor Ontario Canada.
Ecol Evol. 2022 Dec 14;12(12):e9631. doi: 10.1002/ece3.9631. eCollection 2022 Dec.
Accurate assessment of life history and population ecology of widespread species in ultra-eutrophic freshwater lakes is a prerequisite for understanding the mechanisms by which widespread species respond to eutrophication. Freshwater pulmonate () is widespread and abundant in many eutrophic water bodies in Asia. Despite its key roles in eutrophic lake systems, the information on life history and population ecology of is lacking, especially in ultra-eutrophic freshwater plateau lakes. Here, we conducted a 1-year survey of with monthly collections to measure the life history traits (life span and growth), annual secondary production, and population size structure of in nearshore regions with a high seasonally variation of nutrients in Lake Dianchi, a typic hypereutrophic plateau lake in Southwest China. Our results showed that had the highest biomass in autumn and had the lowest in winter. Its maximum potential life span was 2.5 years, with three recruitment periods (November, March, and July) within a year. Its annual secondary production and P/B ratio were 137.19 g WW/m and 16.05, respectively. Redundancy analysis showed that eutrophication-related environmental factors had weak correlations with population size structure of . Our results suggested that is a typical r-strategist with high secondary production and thrive in eutrophic environment. Our study can help better understand the mechanisms for widespread species to survive eutrophication and could also be relevant for biodiversity conservation and management of eutrophic ecosystems.
准确评估超富营养化淡水湖泊中广布物种的生活史和种群生态学，是理解广布物种对富营养化响应机制的前提条件。淡水肺螺在亚洲许多富营养水体中广泛分布且数量众多。尽管其在富营养湖泊系统中具有关键作用，但关于淡水肺螺生活史和种群生态学的信息却十分匮乏，尤其是在超富营养化的淡水高原湖泊中。在此，我们对中国西南部典型的超富营养高原湖泊滇池近岸区域的淡水肺螺进行了为期一年的调查，每月采集样本，以测量其生活史特征（寿命和生长）、年次级生产力以及种群大小结构。我们的结果表明，淡水肺螺在秋季生物量最高，冬季最低。其最大潜在寿命为2.5年，一年中有三个补充期（11月、3月和7月）。其年次级生产力和P/B比分别为137.19 g WW/m和16.05。冗余分析表明，与富营养化相关的环境因素与淡水肺螺的种群大小结构相关性较弱。我们的结果表明，淡水肺螺是典型的r策略者，具有较高的次级生产力，能在富营养环境中 thrive。我们的研究有助于更好地理解广布物种在富营养化环境中生存的机制，也可能与富营养化生态系统的生物多样性保护和管理相关。 （注：“thrive”在原文中可能拼写有误，推测为“thrive”，中文意思为“繁荣、茁壮成长” ）
