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Aquatic Sciences

, Volume 56, Issue 4, pp 388–397 | Cite as

Current status, distribution, life cycle and ecology ofRhithrogena germanicaEaton, 1885 in Switzerland: Preliminary results (Ephemeroptera, Heptageniidae)

  • Verena Lubini
  • Michel Sartori
Article

Abstract

Rh. germanica is a European species that, due to human impacts, has progressively disappeared from its original territories and is now considered rare. In SwitzerlandRh. germanica has disappeared from the Aare, Broye and Kleine Emme rivers and is actually found in a limited reach of the River Rhine and some of its tributaries (Limmat, Sihl, Thur and Töss rivers).Rh. germanica is a univoltine species, hatching probably in summer. The emergence occurs from February to the beginning of April. It takes place on the water surface. Laboratory observations have shown that the subimaginal stage lasts four days.Rh. germanica occurs on different substrate types, ranging from stones and cobbles to pebbles and gravel. The larvae are more abundant in zones of erosion with coarse and porous sediments than in depositional zones with fine sediments and silts. They are most abundant in riffles with water velocities from 20 to 150 cm/sec. The species tolerates moderately organic-polluted waters.

The particular strategy concerning growth and emergence ofRh. germanica is also discussed.

Key words

Mayfly Switzerland distribution ecology life cycle Rhithrogena germanica 

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Copyright information

© Birkhäuser Verlag 1994

Authors and Affiliations

  • Verena Lubini
    • 1
  • Michel Sartori
    • 2
  1. 1.ZürichSwitzerland
  2. 2.Musée de Zoologie, Palais de RumineLausanne 17Switzerland

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