Analysing size-density relationships of aquatic communities in response to strength of predator-prey interactions and resource subsidy

分析水生群落的大小-密度关系以响应捕食者-猎物相互作用的强度和资源补贴

• 批准号: 308980593
• 负责人: Privatdozent Dr. Thomas Mehner
• 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/308980593?language=en
• 关键词: Analysing; size; density; relationships; aquatic

Size-density relationships within the framework of the Energetic Equivalence Hypothesis (which assumes that each species extracts about the same amount of energy from the environment) can be a central concept in ecosystem ecology both for understanding baseline expectations of community structure and for evaluating the effect of top-down and bottom-up processes and ecosystem services. However, despite strong theoretical foundations, empirical evidence for the Energetic Equivalence Hypothesis is largely missing. Our proposal aims to use existing size data of fish and their prey in lakes obtained for European monitoring programs (EU Water Framework Directive) and from several lake-specific research programs to test whether predator-prey interactions and resource subsidy modify the size-density relationships of fish as predicted by the Energetic Equivalence Hypothesis. For this approach, we can use data from almost 400 lakes sampled in a standardized way which will generate sufficient statistical power for hypothesis-testing. However, before these data can be compared with theoretical predictions, a validation and verification of the optimum statistical approach to calculate size-density relationships from fish monitoring data has to be conducted. Therefore, the proposal addresses a systematic comparison of methods to calculate size-density relationships, and a comparison of results from the same lakes, but based on differing sampling gears. After the superior statistical approach is developed, it will be used to test whether the exponents of size-density relationships shift in a predictable way in response to enhanced top-down control or in response to terrestrial subsidy to lake ecosystems. In the long-term, this approach may help evaluating the strength of ecosystem processes from the size distribution of their interacting populations.

能量等效假设（假设每个物种从环境中提取大约相同数量的能量）框架内的大小-密度关系可以是生态系统生态学的核心概念，用于理解社区结构的基线期望，并用于评估自上而下和自下而上的过程和生态系统服务的影响。然而，尽管有强大的理论基础，能量等效假说的经验证据在很大程度上是缺失的。我们的建议的目的是使用现有的大小数据的鱼和他们的猎物在欧洲监测计划（欧盟水框架指令），并从几个湖泊的具体研究计划，以测试是否捕食者-猎物的相互作用和资源补贴修改的大小-密度关系的鱼预测的能量等效假说。对于这种方法，我们可以使用以标准化方式采样的近400个湖泊的数据，这将为假设检验产生足够的统计功效。然而，在这些数据可以与理论预测进行比较，验证和验证的最佳统计方法来计算从鱼类监测数据的大小-密度的关系进行。因此，该提案涉及系统地比较计算大小-密度关系的方法，以及比较来自相同湖泊但采用不同取样装置的结果。上级统计方法制定后，它将被用来测试是否在一个可预测的方式，以加强自上而下的控制或响应陆地补贴湖泊生态系统的大小密度关系的指数转移。从长远来看，这种方法可能有助于从相互作用种群的大小分布来评估生态系统过程的强度。

项目成果

Systematic deviations from linear size spectra of lake fish communities are correlated with predator-prey interactions and lake-use intensity

• DOI: 10.1111/oik.05355
• 发表时间: 2019-01-01
• 期刊: OIKOS
• 影响因子: 3.4
• 作者: Arranz, Ignasi;Hsieh, Chih-hao;Brucet, Sandra
• 通讯作者: Brucet, Sandra

Empirical correspondence between trophic transfer efficiency in freshwater food webs and the slope of their size spectra.

• DOI: 10.1002/ecy.2347
• 发表时间: 2018-06
• 期刊: Ecology
• 影响因子: 4.8
• 作者: T. Mehner;B. Lischke;K. Scharnweber;K. Attermeyer;S. Brothers;U. Gaedke;S. Hilt;S. Brucet

Size Spectra of Pelagic Fish Populations in a Deep Lake—Methodological Comparison between Hydroacoustics and Midwater Trawling

深湖中上层鱼类种群的大小谱——水声学与中层拖网捕捞的方法比较

• DOI: 10.3390/w13111559
• 发表时间: 2021
• 期刊: Water
• 影响因子: 3.4
• 作者: L.-M. ;Mehner
• 通讯作者: Mehner

Model‐based decomposition of environmental, spatial and species‐interaction effects on the community structure of common fish species in 772 European lakes

• DOI: 10.1111/geb.13314
• 发表时间: 2021-05
• 期刊: Global Ecology and Biogeography
• 影响因子: 6.4
• 作者: T. Mehner;C. Argillier;T. Hesthagen;K. Holmgren;E. Jeppesen;F. Kelly;T. Krause;M. Olin;P. Volta;I. Winfield;S. Brucet

Energy‐based top‐down and bottom‐up relationships between fish community energy demand or production and phytoplankton across lakes at a continental scale

• DOI: 10.1002/lno.11434
• 发表时间: 2020-02
• 期刊: Limnology and Oceanography
• 影响因子: 4.5
• 作者: M. Bartrons;T. Mehner;C. Argillier;M. Beklioğlu;P. Blabolil;T. Hesthagen;K. Holmgren;E. Jeppesen;T. Krause;S. Podgornik;P. Volta;I. Winfield;S. Brucet