Effects of climate variability on interactions between cyanobacteria and associated microheterotrophs-consequences for development of toxic cyanobacterial blooms

气候变化对蓝藻和相关微型异养生物之间相互作用的影响——对有毒蓝藻水华发展的影响

基本信息

批准号：
28750711
负责人：
Professor Dr. Hans-Peter Grossart
金额：
--
依托单位：
Abteilung 3: Plankton- und mikrobielle Ökologie
依托单位国家：
德国
项目类别：
Priority Programmes
财政年份：
2006
资助国家：
德国
起止时间：
2005-12-31 至 2010-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/28750711?language=en
关键词：
Effects climate variability interactions between

项目摘要

Recent studies on seasonal dynamics of phytoplankton in fresh and brackish lakes, in particularly on acyclic cyanobacterial blooms in lakes of Northern Germany, suggest multiple interactions rather than individual mechanisms being responsible for the development of cyanobacterial blooms. Variability of temperature is one key factor leading to marked changes in interactions between cyanobacteria and heterotrophic bacteria in terms of symbiosis, parasitism, commensalisms etc. These changes affect the seasonal dominance pattern and may also lead to a decoupling of previously synchronised food webs. By using pure cultures of common and potentially toxic cyanobacteria (Nodularia spumigena, Anabaena spp., Microcystis aentginosa (flos-aquae) incubated with natural and defined communities of heterotrophic bacteria the proposed project aims to experimentally test the following hypotheses: a) Rising temperatures cause severe changes in interactions between cyanobacteria and heterotrophic bacteria, b) Due to a tight coupling between cyanobacteria and heterotrophic bacteria changes in the community composition of heterotrophic bacteria will impact the development of cyanobacteria and may cause decoupling of presently synchronised food webs (mismatch). Underlying mechanisms concerning the role of specific heterotrophic bacterial communities will be investigated using molecular (phylogeny) as well as classical microbiological (physiology) methods.

最近对淡水湖和咸水湖中浮游植物季节性动态的研究，特别是对德国北部湖泊中非周期性蓝藻水华的研究表明，蓝藻水华的发展是多种相互作用而不是单个机制造成的。温度的变化是导致蓝藻和异养细菌之间在共生、寄生、共生等方面的相互作用发生显着变化的关键因素。这些变化影响季节性优势模式，也可能导致先前同步的食物网脱钩。通过使用常见和具有潜在毒性的蓝藻（Nodularia spumigena、Anabaena spp.、Microcystis aentginosa (flos-aquae)）的纯培养物与天然和特定的异养细菌群落一起培养，拟议项目旨在通过实验检验以下假设：a) 温度升高导致蓝藻和异养细菌之间相互作用的严重变化，b）由于蓝藻和异养细菌之间的紧密耦合，导致蓝藻和异养细菌的群落组成发生变化异养细菌将影响蓝细菌的发育，并可能导致目前同步的食物网脱钩（不匹配）。将使用分子（系统发育）以及经典微生物学（生理学）方法研究有关特定异养细菌群落作用的潜在机制。