Response of microphytobenthos to flow and trophic variation in two South African temporarily open/closed estuaries
-
Renzo Perissinotto
, Kogilam Iyer and Christian Nozais
Abstract
Variations in microphytobenthic biomass were investigated in relation to major environmental factors in the Mdloti and Mhlanga temporarily open/closed estuaries (TOCEs), South Africa, from March 2002 to March 2003. Both estuaries receive different volumes of treated sewage waters. This has caused eutrophication and an increase in the frequency of mouth opening, particularly at the Mhlanga. No significant differences were found in microphytobenthic chl a concentrations between the two estuaries. At the Mdloti, microphytobenthic biomass varied considerably, with values ranging from 1.33 to 131 mg chl a m-2 during the open phase, and from 18 to 391 mg chl a m-2 during the closed phase. At the Mhlanga, microphytobenthic biomass ranged from 7.0 to 313 mg chl a m-2 during the open phase, and from 1.7 to 267 mg chl a m-2 during the closed phase. Unlike in the Mdloti, the higher microphytobenthic biomass values at the Mhlanga were not always associated with the closed mouth state. For the duration of the study, the Mdloti functioned as a typical temporarily open/closed system, with prolonged open and closed phases, while the Mhlanga behaved more like a permanently open estuary than a TOCE (it lacked a period of prolonged mouth closure).
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Articles in the same Issue
- Morphological and molecular evidence for multiple invasions of Codium fragile in Atlantic Canada
- Response of microphytobenthos to flow and trophic variation in two South African temporarily open/closed estuaries
- The prostrate system of the Gelidiales: diagnostic and taxonomic importance
- Variations in lipid composition among different developmental stages of Gracilaria verrucosa (Rhodophyta)
- Intra-thallus phlorotannin content and antioxidant activity in Phaeophyceae of temperate waters
- Volatile compounds from some Black Sea red algae and their chemotaxonomic application
- Tissue age as a factor affecting carrageenan quantity and quality in farmed Kappaphycus striatum (Schmitz) Doty ex Silva
- Carrageenan of Eucheuma isiforme (Solieriaceae, Rhodophyta) from Yucatán, Mexico. I. Effect of extraction conditions
- Carrageenan of Eucheuma isiforme (Solieriaceae, Rhodophyta) from Yucatán, Mexico. II. Seasonal variations in carrageenan and biochemical characteristics
- Evaluation of the structures of galactans from Carpopeltis sp., a member of the Halymeniales in the western Indian Ocean
- Evaluation of beneficial bacteria from mangrove soil
- Marine fungi on Nypa fruticans in Thailand