| Abstrakt: |
1.Elemental chemical composition of Sphaeroma hookeriLeach of different natural populations from Camargue (Rhône delta) and from the Bassin de Berre (near Marseilles), was studied on samples taken the same day in different populations and on samples collected at different seasons in the same population.2.Individual analyses of carbon, hydrogen and nitrogen were performed with a Perkin Elmer elemental analyzer. Total inorganic content was obtained for each specimen by weighing the residue after the output of the analyzer.3.Relative growth in ash, carbon, hydrogen and nitrogen content of the different populations samples was compared by means of Reeve's statistical method.4.Chemical allometry lines of each population are given. Variability of growth coefficients or mean values in a given population appears from several samples taken in the course of the year.5.The differences in slope and position have been tested and their significance stated.6.Growth coefficients of ash, carbon, hydrogen and nitrogen contents show a certain variability among the different populations. But these differences are not always significant owing to the dispersion of the data, a result of the wide individual variation within a population.7.Much greater significant differences appear from relative positions of the growth lines, and these seem to be due to some ecological factors, among which, for instance, nutriment can lead to a large difference in carbon content.8.Within a given population no significant difference appears in the growth coefficients of ash, carbon, hydrogen or nitrogen content and therefore the obtained values characterize each population. |
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