Biological interactions in the plankton community of a tropical eutrophic reservoir: is the phytoplankton controlled by zooplankton?

Rückert, Gabriela von; Giani, Alessandra

doi:10.1093/plankt/fbn065

Cited by 35 publications

(18 citation statements)

References 52 publications

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“…The biomass of RF group was negatively correlated with chlorophyll-a. This may be explained in different ways: (i) strong top-down control on phytoplankton by RF group, which is contrary to what is documented in other studies that zooplankton are ineffective in controlling phytoplankton in reservoir (von Rückert and Giani, 2008;Okuku et al, 2016), (ii) high chlorophyll-a concentration could be attributed to blue-green algae and green algae that contain some toxic extracellular substance which can cause decline in number and reproduction rate of rotifers (Arnold, 1971;Ger et al, 2014), and (iii) some studies have shown that rotifers (macrofilter-feeders species) abundance were negatively correlated with algal bloom in Oligo-mesotrophic Nabhana Reservoir because algal bloom eliminated the fine micro-algae which serve as food of micro-filter feeders (Sellami et al, 2016).…”

Section: Zooplankton Functional Groups Driving Factors In Xiquanyan Rcontrasting

confidence: 60%

Seasonal dynamics of Zooplankton functional groups in relation to environmental variables in Xiquanyan Reservoir, Northeast China

Mwagona

2018

Ann. Limnol. - Int. J. Lim.

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In this study, the concept of functional feeding groups was used to classify and model the seasonal variation of zooplankton functional groups in relation to environmental variables. A total of 48 zooplankton species were observed in the reservoir and grouped into 8 functional groups. Both environmental variable and the biomass of zooplankton functional groups vary spatially and seasonally. Water temperature, water transparency, total nitrogen and nitrates were significantly higher in summer, while chlorophyll-a and ammonium were higher in autumn and spring, respectively. Biomass of zooplankton was significantly higher in summer (245.81 μg/L), followed by autumn (196.54 μg/L) and spring (54.25 μg/L). Group RF (rotifer filter feeders) dominated in spring, accounting for 80% of the total biomass. In summer and autumn, group RC (rotifer carnivore) and SCF (small copepods and cladocerans filter feeders) were the dominant, respectively. Total nitrogen, total phosphorus, ammonium, chlorophyll-a and water transparency were the major factor influencing zooplankton community. Group RF was positively influenced by ammonium and total phosphorus, while RC, SCF and MCF (middle copepods and cladocerans filter feeders) were positively correlated with chlorophyll-a. Top-down control of phytoplankton by groups RC, SCF and MCF in Xiquanyan reservoir is not strong enough to produce negative effect. Increase in predator size biomass did not strengthen top-down control on prey. It is quite clear that the zooplankton function groups of Xiquanyan reservoir followed a predictable seasonal pattern. This therefore highlights the significance of environmental variables in structuring plankton composition in the reservoir.

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Section: Zooplankton Functional Groups Driving Factors In Xiquanyan Rcontrasting

confidence: 60%

Seasonal dynamics of Zooplankton functional groups in relation to environmental variables in Xiquanyan Reservoir, Northeast China

Mwagona

2018

Ann. Limnol. - Int. J. Lim.

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“…The negative correlation between D. laevis and chlorophyll-a emphasizes the herbivory pressure of this cladoceran on the phytoplankton community. The availability and quality of food directly affect the reproductive index of a species (Pinto-Coelho et al, 2003;Ruckert and Giani, 2008), and are important controlling factors for population density.…”

Section: Discussionmentioning

confidence: 99%

Fluctuations of the population of Daphnia laevis Birge 1878: a six-year study in a tropical lake

et al. 2012

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The fluctuation of the population of Daphnia laevis in Lake Jacaré (Middle River Doce, Minas Gerais) was monitored monthly (at one point in the limnetic region) for six years (2002)(2003)(2004)(2005)(2006)(2007) as part of the Program of Long-Term Ecological Research (LTER/UFMG). The following parameters were also monitored: water temperature, pH, electrical conductivity, dissolved oxygen, chlorophyll a, total phosphorus, phosphate, total nitrogen, nitrate, nitrite, ammonia, and densities of Chaoborus and ephippia of Daphnia laevis in the sediment.

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“…Fish culture blocks the top-down effects of zooplankton on phytoplankton in these kinds of aquatic ecosystems. Von Ruckert and Giani [51] suggested that fish regulate phytoplankton more than zooplankton in certain systems. As the phytoplankton composition changed from spring to summer and there were no significant top-down effects of zooplankton on phytoplankton, we also suggest the plant defense hypothesis, which states that herbivores control the plant species composition rather than plant biomass [49,52,53].…”

Section: Plos Onementioning

confidence: 99%

Bottom-up and top-down effects on phytoplankton communities in two freshwater lakes

Jin

Zhang

et al. 2020

PLoS ONE

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The relative importance of bottom-up versus top-down effects in aquatic ecosystems remains a longstanding and ongoing controversy. To investigate these effects on phytoplankton communities in freshwater lakes, phytoplankton and zooplankton were sampled, and physical-chemical variables were measured during spring and summer in two important freshwater lakes in northern China: Nansi Lake and Dongping Lake. The redundancy analysis results showed that phytoplankton density and biomass were regulated by physicalchemical variables (bottom-up effects) and predation (top-down effects) together, and the former was more prominent in both lakes. However, the correlation analysis indicated that the top-down effects of zooplankton on phytoplankton were not significant in spring and summer in both lakes, while the bottom-up regulation of physical-chemical variables on phytoplankton had different patterns in the two lakes. In Nansi Lake, the bottom-up effects of physical-chemical variables on phytoplankton were weaker in summer than that in spring due to the abundant nutrients in summer. In Dongping Lake, the bottom-up effects of physical-chemical on phytoplankton were significant both in spring and summer, and the dominant bottom-up control factor shifted from total nitrogen in spring to total phosphorus in summer, with an increased ratio of nitrogen to phosphorus due to changes in limiting factors. In the two studied lakes, with fish culture, the bottom-up effects of phytoplankton on zooplankton were more important than the top-down effects of zooplankton on phytoplankton. These results demonstrate the interactions between phytoplankton and zooplankton and highlight the importance of phytoplankton regulation in freshwater lakes, which has implications for the effective management of freshwater lake ecosystems.

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Biological interactions in the plankton community of a tropical eutrophic reservoir: is the phytoplankton controlled by zooplankton?

Cited by 35 publications

References 52 publications

Seasonal dynamics of Zooplankton functional groups in relation to environmental variables in Xiquanyan Reservoir, Northeast China

Seasonal dynamics of Zooplankton functional groups in relation to environmental variables in Xiquanyan Reservoir, Northeast China

Fluctuations of the population of Daphnia laevis Birge 1878: a six-year study in a tropical lake

Bottom-up and top-down effects on phytoplankton communities in two freshwater lakes

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