Growth and reproduction ofPorphyra columbina Mont. (Bangiales,Rhodophyceae) from southern New Zealand |
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Authors: | M T Brown A W J Frazer D J Brasch L D Melton |
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Institution: | 1. The Seaweed Research Group, University of Otago, P.O. Box 56, Dunedin, New Zealand
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Abstract: | Changes in biomass and chemical composition, and the reproductive phenology ofPorphyra columbina Mont. were monitored at three sites in southern New Zealand over two growing seasons. Both temporal and spatial variations were found. Seasonal changes in biomass and chemical components were correlated with seawater nitrate concentrations and temperature. The summer decline in biomass was a result of the onset of unsuitable environmental conditions and the release of reproductive tissue. Under more suitable conditions, the decline in biomass was delayed. There was an inverse relationship between vegetative growth and reproduction. Reproductive plants first appeared in August at a time of increasing temperature, irradiance and daylength. Only larger plants which were mainly found in subsites low on the shore became reproductive. Plants sampled from high subsites had a shorter growth season, were generally smaller, had lower nitrogen and pigment content and were non-reproductive.Presented at the XIIIth International Seaweed Symposium, University of British Columbia, Vancouver, Canada, August 1989. |
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Keywords: | Porphyra columbina growth reproduction chemical composition seasonality Rhodophyceae New Zealand |
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