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

• 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

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.

最近对淡水和咸水湖泊浮游植物季节动态的研究，特别是对德国北部湖泊非循环蓝藻水华的研究表明，蓝藻水华的发展是多方面的相互作用，而不是单独的机制。温度的变化是导致蓝藻和异养细菌之间在共生、寄生、共生等方面相互作用发生显著变化的一个关键因素。这些变化影响季节性优势格局，也可能导致先前同步的食物网的脱钩。通过使用普通的和潜在有毒的蓝藻(海藻、鱼腥藻、海藻微囊藻)的纯培养，与自然和定义的异养细菌群落孵化，拟议的项目旨在通过实验测试以下假设：a)温度上升导致蓝藻和异养细菌之间的相互作用发生严重变化，b)由于蓝藻和异养细菌之间的紧密耦合，异养细菌群落组成的变化将影响蓝藻的发展，并可能导致目前同步的食物网脱钩(不匹配)。关于特定异养细菌群落作用的潜在机制将使用分子(系统发育)和经典微生物学(生理学)方法进行研究。

项目成果

Microbial activities accompanying decomposition of cladoceran and copepod carcasses under different environmental conditions

不同环境条件下枝角类和桡足类尸体分解伴随的微生物活动

• DOI: 10.3354/ame01331
• 发表时间: 2009
• 期刊: Aquatic Microbial Ecology
• 影响因子: 1.4
• 作者: Kam W. Tang;Samantha L. Bickel. Claudia Dziallas;Hans-Peter Grossart
• 通讯作者: Hans-Peter Grossart

Bacteria dispersal by hitchhiking on zooplankton

• DOI: 10.1073/pnas.1000668107
• 发表时间: 2010-06-29
• 期刊: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• 影响因子: 11.1
• 作者: Grossart, Hans-Peter;Dziallas, Claudia;Tang, Kam W.
• 通讯作者: Tang, Kam W.

Effects of food on bacterial community composition associated with the copepod Acartia tonsa Dana

食物对桡足类 Acaria tonsa Dana 相关细菌群落组成的影响

• DOI: 10.1098/rsbl.2009.0076
• 发表时间: 2009
• 期刊: Biology Letters
• 影响因子: 3.3
• 作者: Kam Tang;Claudia Dziallas;Kristine Hutalle-Schmelzer;Hans-Peter Grossart
• 通讯作者: Hans-Peter Grossart

UV irradiation of natural organic matter (NOM): impact on organic carbon and bacteria

• DOI: 10.1007/s00027-011-0239-y
• 发表时间: 2012-07-01
• 期刊: AQUATIC SCIENCES
• 影响因子: 2.4
• 作者: Paul, Andrea;Dziallas, Claudia;Grossart, Hans-Peter
• 通讯作者: Grossart, Hans-Peter

Zooplankton and aggregates as refuge for aquatic bacteria: protection from UV, heat and ozone stresses used for water treatment.

• DOI: 10.1111/j.1462-2920.2010.02335.x
• 发表时间: 2011-02
• 期刊: Environmental microbiology
• 影响因子: 5.1
• 作者: K. Tang;Claudia Dziallas;H. Grossart