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Evidence of upstream migration by female adults of baetis alpinus pict. (ephemeroptera) at high altitude in the pyrenees

Published online by Cambridge University Press:  15 June 2011

P. Lavandier
P. Lavandier*
Affiliation:
Laboratoire d'Hydrobiologie, Université Paul-Sabatier, ERA 702 d u C.N.R.S., 118, route de Narbonne, F-31062 Toulouse Cedex.
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Abstract

In a high mountain stream, Baetis alpinus at emergence is significantly smaller downstream than upstream. These size differences are used to demonstrate migration of adults upstream: downstream, the size of adult females caught after oviposition corresponds with the size of subimagines which have emerged there; upstream, the size of adult females corresponds with the size of subimagines which have emerged both up and downstream. The migration is clearly an upstream movement.

Type
Research Article
Information
Annales de Limnologie - International Journal of Limnology , Volume 18 , Issue 1 , 1982 , pp. 55 - 59
Copyright
© Masson, 1982

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