Environmental influence on intraspecific variability in Antarctic tintinnids: Cymatocylis affinis/convallaria in Weddell Sea waters.

BOLTOVSKOY DEMETRIO; DINOFRIO ESTELA; ALDER VIVIANA

JOURNAL OF PLANKTON RESEARCH

OXFORD UNIV PRESS

Lugar: Oxford; Año: 1990 vol. 12 p. 403 - 413

0142-7873

Analyses of the morphometry of 630 loricae belonging to the described species Cymatocylis affinis and Cymatocylis convallaria retrieved from 21 samples collected in the Weddell Sea (60 to 73°S) strongly suggest that both taxa, including the four formae into which C. affinis was originally divided, are members of a single species. The only feature which varies significantly and consistently among the samples surveyed is the total length of the lorica, lowest average lengths being positively correlated with lowest absolute abundances of this tintinnid in the waters sampled. This relationship points at some unfavorable factor(s) which affect both tintinnid reproduction/survival and growth; the data analyzed suggest that drops in the availability of food might be responsible for the size (and abundance) variations observed.