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Mismatch between periphyton and macrophyte development in spring: crucial for submerged macrophyte recolonization in eutrophic shallow lakes?

春季附生植物和大型植物发育的不匹配：对于富营养化浅湖水下大型植物的重新定殖至关重要？

基本信息

批准号：
129412161
负责人：
Professorin Dr. Sabine Hilt, since 8/2015
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：
2009
资助国家：
德国
起止时间：
2008-12-31 至 2018-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/129412161?language=en
关键词：
Mismatch between periphyton macrophyte development

项目摘要

Submerged macrophytes stabilize the clear water regime in shallow lakes, but were often completely lost during eutrophication resulting in a shift to the turbid, phytoplankton-dominated regime. Re-colonization of submerged macrophytes often failed after reoligotrophication of shallow lakes despite an increased light availability in spring. Shading by periphyton is supposed to be one of the reasons. Periphyton biomass in eutrophic lakes has been suggested to be potentially controlled by a cascading effect of fish predation on periphyton-grazing invertebrates. Direct experimental evidence of this top-down control of periphyton and its relevance for submerged macrophyte re-colonization, however, is still lacking. We plan a combination of field and laboratory experiments and modeling to unravel the role of periphyton shading for the development of submerged macrophytes as a base for sustainable management of shallow eutrophic lakes. The focus is on in situ evidence of topdown control of periphyton by a fish-invertebrates-cascade, the shading impact during early stages of macrophyte development and the impact of timing of the clear water phase and tuber sprouting in spring for a mismatch between periphyton and macrophyte growth.

沉水植物稳定浅水湖泊的清水制度，但往往完全失去了富营养化，导致转变为浑浊，植物浮游生物为主的制度。沉水植物的再殖民化往往失败后，浅水湖泊再富营养化，尽管在春季增加了光的可用性。被附生生物遮蔽应该是原因之一。在富营养化湖泊中，附着生物的生物量被认为可能受到鱼类捕食附着生物放牧无脊椎动物的级联效应的控制。直接的实验证据，这种自上而下的控制的附着生物和沉水植物重新殖民化的相关性，但是，仍然缺乏。我们计划结合现场和实验室的实验和建模，以解开沉水植物的发展作为浅富营养化湖泊的可持续管理的基础，附生植物遮荫的作用。重点是在原地的证据，自上而下的控制附着生物的鱼类无脊椎动物级联，在早期阶段的大型植物的发展和影响的清水阶段和块茎发芽的时间在春季的影响，为一个不匹配的附着生物和大型植物生长的阴影。