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JOURNAL OF PLANKTON RESEARCH | VOLUME 4 | NUMBER 1 | PAGES 85-91 | 1982
© Oxford University Press

research-article

The combined effects of temperature and salinity on the survival of Euterpina acutifrons (Dana) (Copepoda, Harpacticoida) from the New Zealand and Brazilian coasts

Gloria S. Moreira1, John B. Jillett2, Winona B. Vernberg3 and Martin Weinrich3

1Departamento de Fisiologia, Instituto de Biociências Caixa Postal 11461, Universidade de São Paulo, 05421 São Paulo, Brasil 2Portobello Marine Laboratory, University of Otago P.O. Box 8, Portobello, New Zealand 3College of Health, University of South Carolina Columbia, SC 29208, USA

Received on May 1, 1981; accepted on August 1, 1981 The combined effects of temperature and salinity on the survival of non ovigerous female Euterpina acutifrons from the south-eastern New Zealand and southern Brazilian coasts were studied. Six salinities (6, 20, 34, 48, 62 and 76 {per thousand}) and five temperatures (5, 10, 15, 20 and 25°C) were used for New Zealand specimens while six temperatures (5, 10, 15, 20, 25 and 30°C) and the same salinities were employed for the Brazilian specimens. The mortality data were analysed statistically using multiple regression techniques. Animals from New Zealand showed greater tolerance to cold, less to high temperatures and more resistance to both high and low salinities than those from Brazil, Animals from both areas were slightly more tolerant of low temperature in high salinities and of high temperature in low salinities. These striking differences observed between New Zealand and Brazilian populations of E. acutifrons imply the existence of different physiological races in this species.


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