Mura G., F. Ferrara, F. Fabietti, M. Delise, A. Bocca

Recent literature suggests that the differences recorded as to fatty acid profile in Anostracan species thus far examined. are related to genetic as well as to environmental factors.

The aim of the present study was to examine a number of populations of the same species from different biotopes, to support the above assumption.

Four mountain populations and four plain populations of Chirocephalus diaphanus were analysed. Either in mountain or in plain pools sampling were performed exactly on the same date, although in different periods of the year, due to different timing in life cycles (winter cycle for plain populations. summer cycle for mountain populations).

The results outline high interpopulation differences in lipid content and fatty acid profiles. not only between the two groups of populations considered, but also within them.

As to the lipids. significant differences were recorded between individuals of the two sexes within each population. Moreover females generallv showed higher HUFA levels as compared with males.

Data obtained are compared with previous literature on Anostraca and discussed in relation to pond characteristics.

(Dipartimento di Biologia Animale e dell'Uomo, Universita "La Sapienza", Viale dell'Universita, 32 - 00185 Roma, Italy)