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JOURNAL OF PLANKTON RESEARCH | VOLUME 12 | NUMBER 2 | PAGES 403-413 | 1990
© Oxford University Press

research-article

Intraspecific variability in Antarctic tintinnids: the Cymatocylis affinis/convallaria species group

Demetrio Boltovskoy1, Estela O. Dinofrio2 and Viviana A. Alder2

1Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires 1428 Buenos Aires and CONICET 2lnstituto Antártico Argentino Cerrito 1248,1010 Buenos Aires, Argentina

Received on July 7, 1989; accepted on October 28, 1989 Analyses of the morphometry of 630 loricae belonging to the described species Cymatocylis affinis and Cymatocylis convallaria retrieved from 21 samples collected in the Weddel Sea (6O–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 to some unfavorable factor(s) which affects both tintinnid reproduction/ survival and growth; the data analysed suggest that drops in the availability of food might be responsible for the size (and abundance) variations observed.


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