Phytoplankton equilibrium phases during thermal stratification in a deep subtropical reservoir

Vanessa Becker, Vera Lúcia M Huszar, Luigi Naselli-Flores, J. Padisák

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

1. Equilibrium and non-equilibrium hypotheses have often been used to explain observations in community ecology. Published case studies have demonstrated that steady state phytoplankton assemblages are more likely to occur in deep lakes than in shallow mixed ones. 2. Phytoplankton seasonal succession was studied by weekly sampling in Faxinal Reservoir (S Brazil), a subtropical deep, clear, warm monomictic and slightly eutrophic reservoir. This study demonstrated an alternation of steady and non-steady state phases of phytoplankton assemblages with different dominant species during the steady states. 3. During the studied period, three steady states were identified with different dominant algal species: Anabaena crassa (Cyanobacteria), Nephrocytium sp. (green algae) and Asterionella (diatoms). 4. Each steady state in Faxinal Reservoir developed under stratified conditions of the water column according to the predictions of the disturbance concepts. Apparently, the major forces driving the development and persistence of these steady-state phases were closely related to thermal stratification and its consequences. 5. This study is the first report on development of more than one steady state within a year in a stratified water body. The development of three steady states might be the result of the relatively long stratification period in the Faxinal Reservoir and to its unique geochemical features.

Original languageEnglish
Pages (from-to)952-963
Number of pages12
JournalFreshwater Biology
Volume53
Issue number5
DOIs
Publication statusPublished - May 2008

Fingerprint

phase equilibrium
temperature profiles
stratification
phytoplankton
Nephrocytium
Asterionella
Anabaena
community ecology
Bacillariophyceae
body water
Chlorophyta
Cyanobacteria
case studies
lakes
Brazil
prediction
green alga
water
cyanobacterium
diatom

Keywords

  • Brazil
  • Equilibrium phase
  • Monomictic reservoir
  • Steady state

ASJC Scopus subject areas

  • Aquatic Science

Cite this

Phytoplankton equilibrium phases during thermal stratification in a deep subtropical reservoir. / Becker, Vanessa; Huszar, Vera Lúcia M; Naselli-Flores, Luigi; Padisák, J.

In: Freshwater Biology, Vol. 53, No. 5, 05.2008, p. 952-963.

Research output: Contribution to journalArticle

Becker, Vanessa ; Huszar, Vera Lúcia M ; Naselli-Flores, Luigi ; Padisák, J. / Phytoplankton equilibrium phases during thermal stratification in a deep subtropical reservoir. In: Freshwater Biology. 2008 ; Vol. 53, No. 5. pp. 952-963.
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