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Repartition and ecology of ephemeroptera of tunisia 1st part insecta ephemeroptera



Repartition and ecology of ephemeroptera of tunisia 1st part insecta ephemeroptera



Archives de l'Institut Pasteur de Tunis 63(4): 567-600



The study of 51 localities distributed throughout most of Tunisia has permitted the first establishment of a faunistic inventory of 11 species of Ephemeropterans (excluding Baetidae). 7 of these are newly recorded for Tunisia [Oligoneuriopsis skhounate, Ecdyonurus rothschildi, Caenis luctuosa, Choroterpes mauritanicus, Ephoron virgo, E. glaucops, Potamanthus luteus] and one is new for North Africa [Caenis pusilla]. Species distributions depend essentially on chemical parameters (salinity, Cl-, Ca++, etc.) and on conductivity. Increases the ionic concentration of the water quickly cause large decreases in population diversity, as is seen in eastern, central and southern waters. In Kroumirie, in the North West, the waters are less mineralized and so support a richer fauna. The species Caenis luctuosa possesses by far the greatest range of ecological tolerance. It is the most abundant and most frequent throughout the region, being followed by Ecdyonurus rothschildi. Distributional maps are established and the species' biogeographies and periods of flight ate studied.

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Accession: 006312727

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