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Etude d'une riviere calcaire salmonicole. Phenologie des ephemeropteres

, : Etude d'une riviere calcaire salmonicole. Phenologie des ephemeropteres. Bulletin and Annales de la Societe Royale Belge d'Entomologie, 1214-6: 153-167

The phenology of 11 Ephemeropteran species in a trout stream, the Samson, is described from adults caught during four years (1981-1984). The results are compared with these from other European countries and connected with the life cycles of the species. A great variability appeared between the flight periods; some species fly during several months (Baetis scambus, Ephemerella ignita,...), even almost the whole year (B. rhodani) whereas the adult stages of other species occur during a short period only (one month in E. danica and E. major). The causes of those strategies are discussed. The geographic variations essentially affect the length of the flight period which can be connected with the thermal conditions during winter (in Baetis rhodani) while the emergence type (synchronized or dispersed) seems a specific characteristic. The egg-laying behaviour is also observed in several species and it shows a great variability between the different species.


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