Distribution and population dynamics of Porphyra (Bangiales, Rhodophyta) in the southern Western Cape, South Africa |
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Authors: | Neil J Griffin John J Bolton Robert J Anderson |
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Institution: | (1) Department of Botany, University of Cape Town, Private Bag, Rondebosch, 7701, South Africa;(2) Seaweed Unit, Marine and Coastal Management, Private Bag X2, Roggebaai, 8012, South Africa |
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Abstract: | Although Porphyra is commercially farmed in many countries, in South Africa only small harvests of wild populations for sale as nori have been
carried out. The discovery that Porphyra improves growth of South African abalone (Haliotis midae) farmed inland-based tanks has led to increased pressure to harvest wild populations. This paper reports on a survey of the
distribution and seasonality of Porphyra in the southern Western Cape. Porphyrawas present at all sites surveyed, and showed considerable temporal variation. A significant amount of the Porphyra present is in reserves and therefore protected from harvesting. Close rexamination of one site revealed seasonal populations
of Porphyra that occupied different niches dependent on season. Recruitment peaked in spring and autumn, leading to dense summer and
winter populations. Summer populations generally grew lower in the eulittoral than winter populations. No pattern in the mortality
of larger thalli wasde tected, though sporeling mortality was high following recruitment peaks. Although it seems that most
sites in the southern Western Cape are suitable for harvesting, the taxonomy of the genus in the region urgently needs revision
if populations are to be appropriately managed.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | distribution harvesting Porphyra recruitment seasonality South Africa taxonomy |
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