Zhang, Q. & G. Uhlig. (1993). Dry weight and chemical composition (CHN) in relation to population density of cultivated Tisbe holothuriae (Copepoda, Harpacticoida). Helgoländer Meeresuntersuchungen 47 221-227, figs. 1-3, tab. 1.

121703

Zhang, Q. & G. Uhlig

1993

47 221-227, figs. 1-3, tab. 1.

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The harpacticoid copepod Tisbe hotothuriae was cultivated at different densities in a running-water system. Dry weight and chemical composition (CHN) of both females and egg-sacs have been determined. Dry weight decreased significantly with increasing density from 3.48 to 1.94 ~g in egg-sacs, and from 10.80 to 6.58 ~g in females. Increasing density in both egg-sacs and females results in decrease of carbon, nitrogen and hydrogen contents, expressed as a percentage of dry weight of egg-sacs and females, respectively. Carbon decreases from 52.56 to 50.57 % (egg-sacs) and 45.80 to 39.95 % (9), nitrogen from 12.63 to 11.94 % and 10.72 to 9.73 % and hydrogen from 9.08 to 7.78 % and 7.47 to 6.17 %. The dry weight and elemental compositions of the egg-sacs varied in accordance with that of the females, however, a higher percentage of elemental content was observed in egg-sacs. The energy equivalents were calculated from the carbon content. This indicates that more energy was transferred from the maternal body into egg-sacs. The ratio of carbon to nitrogen did not show any marked variations; no clear relation appeared between C:N and density, indicating a relatively constant chemical composition in both females and egg-sacs.

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