Mortality of zooplankton in lake ecosystems and its contribution to vertical carbon fluxes (ZooFlux)

湖泊生态系统中浮游动物的死亡率及其对垂直碳通量的贡献（ZooFlux）

• 批准号: 319532628
• 负责人: Professor Dr. Hans-Peter Grossart
• 金额: --
• 依托单位: Leibniz-Institut für Gewässerökologie und Binnenfischerei (IGB)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/319532628?language=en
• 关键词: Mortality; zooplankton; lake; ecosystems; its

The objective of the proposed study is to quantifying the role of dead zooplankton (carcasses) in the carbon cycle of aquatic ecosystems. Thereby, we will test the hypothesis that microbial degradation of carcasses during their sinking facilitates (primes) the degradation of more refractory organic matter. The project is part of the joint effort of a research team from Germany and Russia. In order to estimate the contribution of zooplankton carcasses to the carbon cycle, we combine field observations, mesocosm and laboratory experiments as well as modeling. In situ estimations of the zooplankton mortality and sinking rates by sediment traps in the lakes will be accompanied by measurements of turbulent mixing conditions across the stratified water column using modern hydrodynamic field techniques. Laboratory experiments will quantify microbial colonization and degradation rates of zooplankton carcasses. Both field and laboratory data will be used for an advanced model predicting retention time of carcasses in the water column and their contribution to the carbon cycle. Various model scenarios will focus on the role of environmental factors for settling and degradation of dead zooplankton and on potential changes due to climate-driven hypolimnion warming in lakes.

拟议研究的目的是量化死亡浮游动物（尸体）在水生生态系统碳循环中的作用。因此，我们将检验以下假设：尸体在下沉过程中的微生物降解促进（引发）更难降解的有机物的降解。该项目是德国和俄罗斯研究团队共同努力的一部分。为了估计浮游动物尸体对碳循环的贡献，我们结合了现场观察、中生态系统和实验室实验以及建模。对湖泊中沉积物捕集器造成的浮游动物死亡率和下沉率的现场估计将伴随着使用现代水动力场技术对分层水柱的湍流混合条件的测量。实验室实验将量化浮游动物尸体的微生物定殖和降解率。现场和实验室数据将用于高级模型，预测尸体在水体中的保留时间及其对碳循环的贡献。各种模型情景将重点关注环境因素对死亡浮游动物的沉降和退化的作用，以及气候驱动的湖泊水位变暖造成的潜在变化。