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M. D. Rothman R. J. Anderson C. J. T. Boothroyd F. A. Kemp J. J. Bolton 《Journal of applied phycology》2009,21(1):47-53
In South Africa, gracilarioid red algae have been collected as wash-up to be dried and sold for agar extraction for at least
50 years. Despite much research, there is currently no commercial mariculture of the algae locally although this has been
carried out in neighboring Namibia for a number of years. The industry is traditionally confined to Saldanha Bay on the west
coast, although small wash-ups of Gracilariopsis longissima have been collected in nearby St Helena Bay. In Saldanha Bay, wash-ups of Gracilaria. gracilis have been very sporadic over the last few decades, with human alteration of the bay configuration possibly responsible for
an initial major decline in 1974. This unpredictability in the amounts of wash-up has made the industry unstable and increasingly
unprofitable. We compiled the results of previous surveys (some unpublished) of gracilariod populations in St Helena Bay and
the Saldanha-Langebaan sytem, and re-surveyed these populations to examine long-term fluctuations. In Saldanha Bay and Langebaan
Lagoon, standing stock of G. gracilis was estimated at 538 tons fresh weight and 71 tons fresh weight respectively. Less than 4 tons of gracilarioids are estimated
to remain in St Helena Bay. We discuss the fluctuations in biomass and distribution of these South African gracilarioid populations. 相似文献
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