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JOURNAL OF PLANKTON RESEARCH | VOLUME 16 | NUMBER 12 | PAGES 1781-1791 | 1994
© Oxford University Press

research-article

Responses of respiration and photosynthesis of Scenedesmus protuberans Fritsch to gradual and steep salinity increases

Inez A. Flameling and Jacco Kromkamp

Netherlands Institute of Ecology, Centre for Estuarine and Coastal Ecology Vierstraat 28, 4401 EA Yerseke, The Netherlands

Received on June 17, 1994; accepted on August 9, 1994 The effect of an increase in salinity on the physiology of the halotolerant chlorophyte Scenedesmus protuberans was studied in light-limited continuous cultures. It was observed that a gradual, as well as a steep increase in salinity resulted in lower biomass. However, the mechanisms by which this was achieved were different. In the culture that was exposed to a gradual salinity increase, respiration and the cellular protein content of the culture were initially unaffected. However, this culture was not able to maintain its cellular chlorophyll content and, consequently, gross and net photosynthesis decreased. The culture that was exposed to a steep salinity increase rapidly reacted by increasing its respiration and cellular protein content, which is ascribed to an induction of osmoregulation. This culture was able to maintain its gross photosynthesis rate. It is speculated that, in this species, a steep salinity increase induces a nearly immediate osmoregulatory response, allowing growth to continue. If the cells are exposed to a gradual salinity increase, induction of osmoregulation lags behind and, consequently, photosynthesis and growth rate will be* affected.


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