Abstract
Gametophytes of Ecklonia radiata (C.Ag.)J.Ag. from two New Zealand locations with different field temperature ranges were exposed to temperatures of 5° to 26°C in saturating light. Plants from Goat Island Bay (Lat. 36° 16′S, Long. 174°48′E) grew in 9.3° to 25°C and reproduced in 9.3° to 24°C. There was no growth at 8°C and plants died at 26°C. Plants from the cooler location, Houghton Bay (Lat. 41°20′S, Long. 174°40′E), grew from 8° to 24°C and reproduced up to 15°C but not at 21.5°C. The plants did not grow at 6°C and died at 26°C. The timing of the first cell division and subsequent growth rate were retarded close to the upper and lower tolerance limits. Reproduction was a broad optimum of roughly 12° to 20°C. Within this range, fertile female gametophytes grown at lower temperatures had fewer, larger cells and thus fewer potential ova than those grown at higher temperatures.
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Communicated by R. W. Doyle, Halifax
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Novaczek, I. Response of gametophytes of Ecklonia radiata (Laminariales) to temperature in saturating light. Marine Biology 82, 241–245 (1984). https://doi.org/10.1007/BF00392405
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DOI: https://doi.org/10.1007/BF00392405