Hydrobiologia

, Volume 408, Issue 0, pp 335–342 | Cite as

Dynamics and stability of Chara sp. and Potamogeton pectinatus in a shallow lake changing in eutrophication level

  • Marcel S. Van den Berg
  • Marten Scheffer
  • Egbert Van Nes
  • Hugo Coops

Abstract

The submerged vegetation in Veluwemeer (The Netherlands) has shown large changes over the past 30 years. Potamogeton pectinatusL. remained present in the lake even during the hypertrophic period with total phospohorus (P) levels of about 0.6 mg P l-1. Furthermore, the data suggest that there may be one critical level of Secchi depth for the presence of charophytes (about 0.4 m), whilst there may be two critical P levels (0.3 mg P l-1for loss and 0.1 mg P l-1for their return). Logistic regression of detailed vegetation maps over the past 10 years (1988–1997) showed that occurrence of Charaspp. was positively related with spring averages of Secchi depth, while the occurrence of P. pectinatuswas slightly negatively related with Secchi depth. Both species had a negative sigmoid response to water depth. Sites without vegetation can be easily predicted by water depth and Secchi depth (97% for Charaand 99% for P. pectinatuscorrectly predicted cases). The sites where the species will appear are difficult to predict (50% for Charaand 3% for P. pectinatuscorrectly predicted cases, respectively). If the vegetation of a year prior to the census was included as variable, the predictability of the occurrence of P. pectinatusand Characan be improved to 71% and 53% correctly predicted cases, respectively. Grid cells which had been covered 1 year earlier with dense Charavegetation showed a different relationship with Secchi depth than the grid cells without earlier cover. Previous dense Chara(>50% cover) stands returned always in the subsequent year independent on water depth or Secchi depth. Measurements in 1995 showed that dense charophyte beds decrease the turbidity to below 1 m-1(estimated light attenuation, Kd) in high summer, while outside the vegetation the water remained turbid (estimated Kd∼3 to 5 m−1). The positive effect on transparency, together with formation of dense propagule banks, may stabilize the Charavegetation. Dominance of P. pectinatusmay be restricted to turbid water, since Charaappears to be a stronger competitor than P. pectinatusin clear water.

transparency turbidity macrophytes logistic models 

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Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • Marcel S. Van den Berg
    • 1
  • Marten Scheffer
    • 2
  • Egbert Van Nes
    • 2
  • Hugo Coops
    • 1
  1. 1.Institute for Inland Water Management and Waste Water TreatmentLelystadThe Netherlands
  2. 2.Wageningen Agricultural UniversityWageningenThe Netherlands

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