Spatial- and niche segregation of DCM-forming cyanobacteria in Lake Stechlin (Germany)

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• 作者：G茅za B. Selmeczy ; K谩lm谩n Tapolczai ; Peter Casper ; Lothar Krienitz…
• 关键词：Aphanizomenon flos ; aquae ; Planktothrix rubescens ; Cyanobium sp. ; Deep chlorophyll maximum
• 刊名：Hydrobiologia
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：764
• 期：1
• 页码：229-240
• 全文大小：1,802 KB
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• 作者单位：G茅za B. Selmeczy (1) (2)
  K谩lm谩n Tapolczai (1) (3)
  Peter Casper (2)
  Lothar Krienitz (2)
  Judit Padis谩k (1) (4)
  
  1. Department of Limnology, University of Pannonia, Egyetem u. 10, Veszpr茅m, 8200, Hungary
  2. Department of Experimental Limnology, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Alte Fischerhuette 2, 16775, Stechlin-Neuglobsow, Germany
  3. INRA, UMR Carrtel, 75 av. de Corzent, BP 511, 74203, Thonon-les-Bains Cedex, France
  4. MTA-PE Limnoecology Research Group, Egyetem u. 10, Veszpr茅m, 8200, Hungary
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Hydrobiology
  Ecology
  
• 出版者：Springer Netherlands
• ISSN：1573-5117

文摘

At low trophic state, stable stratified water columns may provide favorable conditions for adapted phytoplankton species to form deep chlorophyll maxima (DCM). Such maxima occur regularly in Lake Stechlin, mainly contributed by the cyanobacterial species Cyanobium sp. and occasionally by Planktothrix rubescens. In the early twenty-first century, a rapid invasion by nostocalean cyanobacteria occurred in the lake and a number of Dolichospermum species together with Aphanizomenon flos-aquae appeared. As revealed by both microscopic and fluorimetric methods, during the summer stratification of 2013, a multispecific DCM was formed by Cyanobium, Planktothrix rubescens, and A. flos-aquae, however with spatial segregation. Planktothrix occurred in the upper hypolimnion, Aphanizomenon and Cyanobium dominated in the metalimnetic layer. Coexistence of these three cyanoprokaryota is possibly the consequence of different environmental factors limiting them (light, availability of N and P). This study represents a rare case when spatial niche segregation of phytoplankton species occurs in close to equilibrium conditions. DCM formed by Aphanizomenon and Cyanobium was detected by the fluoroprobe; Planktothrix with its different pigment compositions remained largely hidden. Our results indicate the necessity of parallel microscopic investigations and the need of careful calibration when fluorimetric methods are used for detecting cyanobacterial populations. Keywords Aphanizomenon flos-aquae Planktothrix rubescens Cyanobium sp. Deep chlorophyll maximum