Zooplankton feeding on size fractionated <i>Microcystis</i> colonies and <i>Chlorella</i> in a hypertrophic lake (Hartbeespoort Dam, South Africa): implications to resource utilization and zooplankton succession

Jarvis, Andrew C.; Hart, R. C.; Combrink, Susan

doi:10.1093/plankt/9.6.1231

Cited by 61 publications

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“…They are also higher than the estimates for hypertrophic Hartbeespoort Dam, where inefficient food chain processes have been identified as the cause of low secondary production (Jarvis, 1986 ;Jarvis et al, 1987).…”

Section: Discussioncontrasting

confidence: 56%

“…4) . Such changes have been shown to influence zooplankton succession in Hartbeespoort Dam (Jarvis, 1986 ;Jarvis et al ., 1987). The annual shift from large-bodied to small-bodied cladocerans in Rhenosterkop Dam suggests that a combination of fish predation pressure on large zooplankters (Brooks & Dodson, 1965) and physical factors, such as temperature and turbidity, probably had a strong influence on successional events .…”

Section: Discussionmentioning

confidence: 99%

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Phytoplankton and zooplankton population dynamics and production of a recently formed African reservoir

et al. 1992

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The study provides a 2 .5 year record of Rhenosterkop Dam (KwaNdebele, South Africa) plankton population dynamics and production in relation to physical and chemical changes which occurred during the trophic depression and stabilization phases of the reservoir . The mean volume of the reservoir was 4 % of full storage capacity . Water temperatures ranged from 14 ° C to 27 'C . Due to inorganic suspensoids, the euphotic zone averaged 2 .6 m . An anaerobic zone developed each summer . The nitrogen, soluble reactive phosphorus (SRP) and silica concentrations did not display a seasonal pattern, but the latter two nutrients declined over the study . The dominant phytoplankton group was the cryptophytes while the zooplankton population was dominated by crustaceans . Chlorophyll a concentrations ranged from 1 .1 to 27 mg m-3 and were positively correlated to silica and SRP concentrations and inversely with NH 4-N concentrations . Primary production ranged from 22 .6 to 375 mgC m -2 h-' ; changes in A,,, a, were positively correlated to silica and SRP concentrations . Total zooplankton dry weight biomass varied from < 0 .5 to > 4 mg I -' . Annual zooplankton (secondary) production was 8 to -15 gC m -3 a -'; both primary and secondary production were greatest in the first 12 months of study and remained at low levels for the remainder, similar to the trends for silica and SRP . The data indicate that the reservoir shifted from eutrophic to mesotrophic during the study, typical of events in new reservoirs, and that changes in the plankton populations were largely the result of changing nutrient concentrations .Introduction 1990). Groundwater resources are limited and the surface waters are relied upon for urban, indusThe majority of water resources in southern Aftrial and agricultural purposes . Irrigation is the rica are riverine and south of the Zambezi River major use of surface waters in this region, adding there are very few natural lakes (Allanson et al., to the load placed on limited surface resources

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Section: Discussioncontrasting

confidence: 56%

Section: Discussionmentioning

confidence: 99%

Phytoplankton and zooplankton population dynamics and production of a recently formed African reservoir

et al. 1992

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“…For example, the velocity of their vertical migration is influenced by colony size, and large colonies migrate faster than smaller ones (Kromkamp and Walsby 1990). Other advantages of a large colony or trichome of cyanobacteria include efficient growth (Chan et al 2004;Wilson et al 2006), resistance to strong irradiance (Pechar and Masojídek 1995) and the reduction of grazing pressure by zooplankton (Jarvis et al 1987;Ghadouani et al 2003;Yang et al 2008). Kurmayer et al (2003) reported that the production of microcystins by Microcystis also depends on colony size, and the proportion of microcystin-producing genotypes tends to be greater in larger colonies than in smaller ones.…”

Section: Introductionmentioning

confidence: 99%

Seasonal variations in the morphology of bloom-forming cyanobacteria in a eutrophic pond

Yamamoto

Nakahara

2009

Limnology

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Seasonal variations in the cell volume, number of cells in a colony and trichome length of nine bloomforming cyanobacteria species were investigated in a small eutrophic pond from May to November 2005. The main genera of cyanobacteria were Microcystis and Anabaena, which formed a dense bloom from July to August. M. aeruginosa, M. viridis and M. wesenbergii were present throughout the study period. M. viridis dominated the Microcystis population (39.2-67.1% of total biovolume) during the pre-blooming period, but M. aeruginosa and M. wesenbergii dominated after July. M. aeruginosa was the dominant species from July to November, constituting 49.0-93.2% of the Microcystis population. Each Microcystis species could always be identified from the cell volume and the number of cells in a colony. The numbers of cells in colonies of M. aeruginosa, M. viridis and M. wesenbergii were in the ranges 37-444, 28-143 and 50-264, respectively. The Anabaena population consisted of three species-A. crassa, A. flos-aquae and A. reniformis. A. crassa and A. flos-aquae were typically present at higher densities than A. reniformis. These species also showed distinctive cell volumes. The number of cells in colonies of A. crassa, A. flos-aquae and A. reniformis were in the ranges 19-178, 18-113 and 29-143, respectively.Planktothrix raciborskii and Raphidiopsis mediterranea appeared in August and Aphanizomenon flos-aquae increased from late October, although these species were less abundant. Cell volumes of Microcystis and Anabaena and trichome length of P. raciborskii were positively correlated with water temperature. Small colonies of Microcystis and Anabaena remained small during the bloom period. In contrast, the trichome length of P. raciborskii seemed to depend more strongly on growth conditions.

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“…Lampert, 1978) on phytoplankton in Hartbeespoort Dam was unlikely to have influenced our estimates of EDOC production. Jarvis et al (1987) have shown that zooplankton grazing on Mcrocystis was insignificant because colony size was too large even for large Daphnia. We conclude, therefore, that our estimates of mid-day, phytoplankton EDOC production in Hartbeespoort…”

Section: Discussionmentioning

confidence: 99%

Phytoplankton extracellular dissolved organic carbon production in a hypertrophic African Lake

Robarts¹,

Sephton²

1989

Hydrobiologia

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The spatial and temporal changes in phytoplankton (predominantly Microcystis aeruginosa) production of particulate organic carbon (primary production) and extracellular dissolved organic carbon (EDOC) were measured in hypertrophic Hartbeespoort Dam, South Africa, for 5 years. The study objectives were to determine the significance of EDOC production to primary production estimates and to identify the dominant factors associated with EDOC production.

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Zooplankton feeding on size fractionated Microcystis colonies and Chlorella in a hypertrophic lake (Hartbeespoort Dam, South Africa): implications to resource utilization and zooplankton succession

Cited by 61 publications

References 0 publications

Phytoplankton and zooplankton population dynamics and production of a recently formed African reservoir

Phytoplankton and zooplankton population dynamics and production of a recently formed African reservoir

Seasonal variations in the morphology of bloom-forming cyanobacteria in a eutrophic pond

Phytoplankton extracellular dissolved organic carbon production in a hypertrophic African Lake

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