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Hydrobiologia

, Volume 292, Issue 1, pp 283–288 | Cite as

Seasonal variations in carbon and nitrogen content of Acartia clausi (Copepoda, Calanoida) in the Gulf of Trieste (Northern Adriatic Sea)

  • B. Cataletto
  • S. Fonda Umani
Article

Abstract

A yearly study was made on total and cephalothorax lengths, dry weight, carbon and nitrogen contents and C:N ratio of the species Acartia clausi (Copepoda, Calanoida) which is always abundant, particularly in spring, in the net zooplankton community of the Gulf of Trieste (Northern Adriatic Sea). The samples of net zooplankton were carried out every month at the permanent station located 200 m offshore and preserved for about one year in 4% buffered formalin to insure weight loss stabilization. A. clausi was separated from other zooplankton specimens; washed and dried. For each monthly sample the average total and cephalothorax lengths and the average dry weight of adult organisms of A. clausi were measured. The mean carbon and nitrogen contents, as a percentage of dry weight, were determined by using a CHN analyser. Linear regression models were computed on the log-transformed data in order to check the relationships between dry weight, total and cephalothorax lengths, carbon and nitrogen contents and C:N ratio of A. clausi. The best of the various established correlations, was between dry weight and carbon content. Our study pinpointed a high seasonal variability of the C:N ratio, mainly due to seasonal fluctuations in the nitrogen content.

Key words

Acartia clausi carbon content nitrogen content dry weight seasonal variations 

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Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • B. Cataletto
    • 1
  • S. Fonda Umani
    • 2
  1. 1.Laboratory of Marine BiologySanta Croce, TriesteItaly
  2. 2.Department of BiologyUniversity of TriesteTriesteItaly

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