Upwelling in a nearshore marine ecosystem and its biological implications

Phytoplankton Biomass and Production in a Southern Benguela Kelp Bed System

“…The study site together with macrophyte and fauna1 distribution has been described by . Field et al (1980) showed that the kelp beds at this site were relatively well flushed a n d thus for the purposes of this investigation a single fixed sampling station was selected in 20 m water depth immediately offshore of extensive Laminaria beds (Fig. 1).…”

“…Thus nutrients necessary for primary production rarely reach limiting levels and primary production is maintained over the spring/summer/autumn period when south easterly winds prevail. Another consequence of the 'pulsing' upwelling system is that the nearshore region is subjected to bouts of cold, nutrient rich, phytoplankton-poor water and warmer, lower nutrient, phytoplankton-rich water in active and relaxation phases of the upwelling cycle, respectively (Field et al, 1980).…”

Commercial seaweeds in southern Africa: a review of utilization and research

“…1979, Bolton and Levitt 1985, Probyn and McQuaid 1985, Bolton and Anderson 1987, J oska and Bolton 1987, their alginate content (Yon Holdt et al 1955, Hay et al 1983, and their role in the inshore food web (Field et al 1977, 1980a, 1980b, Yelimirov et al 1977, Yelimirov and Griffiths 1979, Mazure and Field 1980, Newell et at. 1980, Allen and Griffiths 1981, Jarman and Carter 1981.…”

Analysis of a Benthic Community Food Web Using Isotopically Labelled Potential Food

“…The cultures were agitated by a magnetic stirrer. The cultures of approximately 10 X 10 cells 1 -I were diluted approximately 10 times when added to the 10 1 tank giving a concentration of particulate matter similar to that measured in kelp beds (Field et al, 1980b) and giving optimal filtration rates of Aulacomya ater (Griffiths and King, 1979), the major fauna1 component of the kelp holdfast.…”