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Deux generations successives d'Epeorus sylvicola ont ete etudiees dans un torrent de haute montagne : le Tifferguine (altitude 2600 m ; temperature 0-22 C° ; couvert de neige 1-2 mois par an). Le cycle biologique dure un an. La vitesse de croissance depend de la temperature. Les larves se nourrissent de periphyton et occupent principalement les substrats pierreux. Au printemps, les vegetaux qui envahissent le lit et reduisent la surface d'habitat de l'espece provoquent (associes a des temperatures maximum devenant lethales ?) la disparition des larves en mai. Ainsi chaque annee, la production depend du degre de developpement atteint par la cohorte quand surviennent ces conditions defavorables.

annales de limnologie

Influence of temperature and macrophytes development on the larval population dynamics of<i>Epeorus sylvicola</i>Pict (Ephemeroptera) in a torrential river of the «Haut-Atlas de Marrakech» (Morocco)

Influence of temperature and macrophytes development on the larval population dynamics ofEpeorus sylvicolaPict (Ephemeroptera) in a torrential river of the «Haut-Atlas de Marrakech» (Morocco)