Seasonal Variations in the Vertical Distribution of Benthic Microalgae in the Upper Sediment of the Mdloti Estuary, South Africa
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| 024 | 7 | 0 | |a 10.1515/BOT.2003.029 |2 doi |
| 035 | |a (NATIONALLICENCE)gruyter-10.1515/BOT.2003.029 | ||
| 245 | 0 | 0 | |a Seasonal Variations in the Vertical Distribution of Benthic Microalgae in the Upper Sediment of the Mdloti Estuary, South Africa |h [Elektronische Daten] |c [S. Mundree, R. Perissinotto, C. Nozais] |
| 520 | 3 | |a A 12-month survey investigated seasonal variations in the vertical distribution of benthic microalgal biomass in relation to major factors potentially controlling their dynamics in the subtropical temporarily-open Mdloti Estuary, KwaZulu-Natal, South Africa. Benthic microalgal chl-a concentrations in the upper 5 cm of sediment ranged from 259 mg m−2 to 977 mg m−2 during the closed phase, and from 6.7 mg m−2 to 305 mg m−2 during the open phase. Significant differences were obtained between sampling sites and among seasons. A distinctive trend of increasing chl-a biomass in the deeper layers of the sediment was noted from the upper reaches (head) to the lower reaches (mouth) of the estuary. Chl-a biomass was virtually homogeneously distributed throughout the upper 5 cm of sediment in the lower reaches. Results suggest that benthic microalgal cells not only exhibited diel rhythms of vertical migration but were actively re-suspended into the water-column of the Mdloti Estuary. While a decrease in salinity, temperature and Kd favoured an increase in benthic microalgal chl-a biomass in the upper 5cm sediment, nutrients in the overlying water had no significant impact on the biomass. Results further indicate a physiologically healthy community at all sites during the open phase, as compared to the closed phase of the estuary. During the closed phase, the pheopigment to chl-a ratio indicated an actively growing community in the upper reaches and a "stressed” community in the middle and lower reaches. Thus, the large amounts of "buried” benthic microalgal chl-a biomass found in the upper 5 cm of sediment may represent an important stock of potential primary producers in temporarily-open estuarine systems like the Mdloti. | |
| 540 | |a Copyright © 2003 by Walter de Gruyter GmbH & Co. KG | ||
| 690 | 7 | |a Hydrobiology |2 nationallicence | |
| 690 | 7 | |a Mycology, fungi |2 nationallicence | |
| 690 | 7 | |a Botany & plant sciences |2 nationallicence | |
| 700 | 1 | |a Mundree |D S. |4 aut | |
| 700 | 1 | |a Perissinotto |D R. |4 aut | |
| 700 | 1 | |a Nozais |D C. |4 aut | |
| 773 | 0 | |t Botanica Marina |d Walter de Gruyter |g 46/4(2003-07-07), 323-331 |x 0006-8055 |q 46:4<323 |1 2003 |2 46 |o botm | |
| 856 | 4 | 0 | |u https://doi.org/10.1515/BOT.2003.029 |q text/html |z Onlinezugriff via DOI |
| 908 | |D 1 |a research article |2 jats | ||
| 950 | |B NATIONALLICENCE |P 856 |E 40 |u https://doi.org/10.1515/BOT.2003.029 |q text/html |z Onlinezugriff via DOI | ||
| 950 | |B NATIONALLICENCE |P 700 |E 1- |a Mundree |D S. |4 aut | ||
| 950 | |B NATIONALLICENCE |P 700 |E 1- |a Perissinotto |D R. |4 aut | ||
| 950 | |B NATIONALLICENCE |P 700 |E 1- |a Nozais |D C. |4 aut | ||
| 950 | |B NATIONALLICENCE |P 773 |E 0- |t Botanica Marina |d Walter de Gruyter |g 46/4(2003-07-07), 323-331 |x 0006-8055 |q 46:4<323 |1 2003 |2 46 |o botm | ||
| 900 | 7 | |b CC0 |u http://creativecommons.org/publicdomain/zero/1.0 |2 nationallicence | |
| 898 | |a BK010053 |b XK010053 |c XK010000 | ||
| 949 | |B NATIONALLICENCE |F NATIONALLICENCE |b NL-gruyter | ||