Phytoplankton response to experimental thermocline deepening

a mesocosm experiment

Géza B. Selmeczy, Lothar Krienitz, Peter Casper, J. Padisák

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A number of modelling results suggested thermocline shifts as a consequence of global climate change in stratifying lakes. Abundance and composition of the phytoplankton assemblage is strongly affected by the stratification patterns, and therefore, change in the thermocline position might have a substantial effect on this community or even on the whole lake ecosystem. In this study, thermocline depths in large mesocosms installed in Lake Stechlin (Germany) were deepened by 2 meters and phytoplankton changes were analysed by comparing changes to untreated mesocosms. Higher amounts of SRP were registered in the hypolimnion of treatment mesocosms than in the controls, and there were no differences in the epilimnion. Small but significant changes were observed on the phytoplankton community composition related to the effect of deepening the thermocline; however, it was weaker than the yearly successional changes. The most remarkable differences were caused by Planktothrix rubescens and by chlorophytes. P. rubescens became strongly dominant at the end of the experiment in the mesocosms, and in the open lake as well. The results of the experiment cannot clearly support the proliferation of cyanobacteria in general; however, the deepened thermocline can modify the behaviour of some species, as was observed in case of P. rubescens.

Original languageEnglish
Pages (from-to)259-271
Number of pages13
JournalHydrobiologia
Volume805
Issue number1
DOIs
Publication statusPublished - Jan 1 2018

Fingerprint

Planktothrix rubescens
mesocosm
thermocline
phytoplankton
lakes
experiment
lake
epilimnion
hypolimnion
lake ecosystem
Cyanobacteria
Germany
climate change
community composition
global climate
cyanobacterium
stratification
ecosystems
modeling

Keywords

  • Altered stratification
  • Climate change
  • Lake Stechlin
  • Mesocosm experiment
  • Phytoplankton community
  • Planktothrix rubescens

ASJC Scopus subject areas

  • Aquatic Science

Cite this

Phytoplankton response to experimental thermocline deepening : a mesocosm experiment. / Selmeczy, Géza B.; Krienitz, Lothar; Casper, Peter; Padisák, J.

In: Hydrobiologia, Vol. 805, No. 1, 01.01.2018, p. 259-271.

Research output: Contribution to journalArticle

Selmeczy, Géza B. ; Krienitz, Lothar ; Casper, Peter ; Padisák, J. / Phytoplankton response to experimental thermocline deepening : a mesocosm experiment. In: Hydrobiologia. 2018 ; Vol. 805, No. 1. pp. 259-271.
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