Dry weight and chemical composition (CHN) in relation to population density of cultivatedTisbe holothuriae (Copepoda,Harpacticoida) |
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Authors: | Qian Zhang Gotram Uhlig |
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Institution: | (1) Institute of Oceanology, Academia Sinica, 266071 Qingdao, P. R. China;(2) Biologische Anstalt Helgoland, D-27483 Helgoland, Federal Republic of Germany;(3) Zu den Brüchen 3, D-59427 Unna-Billmerich |
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Abstract: | The harpacticoid copepodTisbe holothuriae 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 1.94μg in egg-sacs,
and from 10.80 to 6.58μg 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% (⧫), 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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Keywords: | |
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