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Wetlands Ecology and Management

, Volume 8, Issue 6, pp 375–389 | Cite as

Dynamics of common reed (Phragmites australisTrin.) in Swiss fens with different management

  • Sabine Güsewell
  • Christophe Le Nédic
  • Alexandre Buttler
Article

Abstract

Dynamics of common reed (Phragmites australisTrin.) in Central Europe have so far mostly beeninvestigated in connection with studies on reed`die-back' along lake shores. However, there hasrecently been increasing concern about reed expansionat terrestrial sites, such as fens and wet grasslands.In this paper we report on the results of fourseparate studies which monitored reed dynamics inSwiss fens with various mowing regimes over a periodof 4 to 15 years. The first study compared unmownplots with plots mown in winter in a triennialrotation; the second one included unmown plots, plotsmown in summer, and plots mown in winter; the thirdone compared plots mown in June and September withplots only mown in September; the fourth studyinvestigated only plots mown in September. Shootnumber and shoot size were recorded in permanentquadrats. In all studies the performance of P.australisfluctuated without trend or tended todecrease during the period investigated. Thedecreasing tendency concerned shoot size rather thanshoot number, and within a given study it was strongerfor plots with initially taller shoots. The variousmowing regimes did hardly influence these changes.Mowing in winter every three years reduced shoot sizein the year after mowing, but not on the long term.Mowing every year in late summer reduced the shootsize compared with unmown plots on the short term, butthis effect almost disappeared on the long term, aftermowing had become biennial. Mowing in June (inaddition to in September) caused no noticeableeffects. We conclude that other factors (e.g. weatherconditions, competition, or population processes) aremore important than management in determining theabundance of P. australisin the fen communitiesinvestigated here, although long-term effects ofmowing in summer still need more investigation. As apractical consequence it is suggested that at siteswhich are not strongly dominated by P.australis, as most of those investigated here,reducing the performance of this species should notconstitute a major target of nature conservationmanagement, nor can its dynamics be used as anindicator for management success before underlyingcauses are better understood.

abundance fluctuations long-termstudies monitoring mowing permanent quadrats 

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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • Sabine Güsewell
    • 1
  • Christophe Le Nédic
    • 2
  • Alexandre Buttler
    • 3
  1. 1.Geobotanisches Institut ETH ZürichZürichSwitzerland
  2. 2.Groupe d'étude et de gestionGrande CariçaieYverdonSwitzerland
  3. 3.Institut de BotaniqueUniversité de NeuchâtelNeuchâtelSwitzerland

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