Response of zooplankton community to turbulence in large, shallow Lake Taihu: a mesocosm experiment

Zhou, Jian; Han, Xiaoxia; Qin, Boqiang; Casenave, Céline; Yang, Guijun

doi:10.1127/fal/2016/0797

Cited by 20 publications

(20 citation statements)

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“…Thus, the turbulence conditions in the experimental ponds corresponded to natural lake circumstances. Based on the dissipation rate and kinematic viscosity of the water (Tennekes & Lumley, 1972;Zhou et al, 2016), the smallest eddy diameter in our experiment was c. 0.7 mm. Each experiment of the four combinations of turbulence and predation (CALM-CTRL, CALM-IP, TURB-CTRL, TURB-IP) included three replicate ponds.…”

Section: Experimental Set-upmentioning

confidence: 85%

“…This was expected because the effect of turbulence on planktonic organisms depends on the size of the organisms in relation to the size of the turbulent eddies. Especially organisms larger than the diameter of the smallest eddies may be directly affected by turbulent forces (Peters & Marrasé, 2000;Zhou et al, 2016). In the rotifer community of the experimental ponds, Asplanchna was the only taxon, where the individual size occasionally reached the size of the smallest eddies.…”

Section: Discussionmentioning

confidence: 99%

“…Large and strong swimmers such as adult fish are usually unaffected by turbulence due to their high maneuverability (Kiørboe & Saiz, 1995). On the other hand, very small organisms may also be immune to turbulence (Peters & Marrasé, 2000;Zhou et al, 2016). The most pronounced effects of turbulence have been described for organisms of intermediate sizes, such as crustacean zooplankton, macroinvertebrates, and larval fish (Rothschild & Osborn, 1988;MacKenzie et al, 1994;Kiørboe & Saiz, 1995).…”

Section: Introductionmentioning

confidence: 99%

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Rotifer communities under variable predation-turbulence combinations

et al. 2018

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The effects of water turbulence on rotifer communities were experimentally studied under different predation pressures. When the larvae of the phantom midge (Chaoborus flavicans) were present in turbulent water, the abundance of most rotifer taxa was enhanced. Especially the genera Chromogaster, Keratella, Polyarthra, and Trichocerca, increased in abundance. In calm water, chaoborids did not affect the rotifer community. In turbulent water predation by chaoborids was targeted more towards cladocerans (Bosmina sp.) and predation pressure on rotifers was relaxed. Additionally, reduced competition with cladocerans probably contributed to the increase of rotifer abundance. Turbulence alone had no significant effect on rotifer abundance because their individual size was small compared with the diameter of the turbulent eddies. The study suggested that the effects of turbulence on rotifers is not direct but takes place through changed predator-prey relations, i.e., the effect depends on the abundance of invertebrate predators. In aquatic ecosystems with a high density of chaoborids, increasing turbulence can considerably increase the abundance of rotifers.

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Section: Experimental Set-upmentioning

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rotifer communities under variable predation-turbulence combinations

et al. 2018

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“…At the beginning of the experiment, 150 mL inoculums of the exponentially growing M. aeruginosa (∼4.83 Â 10 6 cells mL À1 ) were transferred to 500 mL Erlenmeyer flasks containing 200 mL of modified BG-11 medium. Considering the current velocities of Lake Poyang (0.075-1.34 m s À1 ) (Lai et al, 2015), Lake Chaohu (0.002-0.109 m s À1 ) (Wang et al, 2016a), and Lake Taihu (0.005-0.077 m s À1 ) (Zhou et al, 2016), different mixing intensities were designed as following: 0, 50, 100, 200, and 400 rpm, which approximate current velocities of 0, 0.16, 0.32, 0.64, and 1.28 m s À1 (Camacho et al, 2007;Rodríguez et al, 2009), respectively. For treatments, continuous mixing was maintained for 24 h while the 0 rpm groups were considered as the controls.…”

Section: Methodsmentioning

confidence: 99%

Effects of mixing intensity on colony size and growth ofMicrocystis aeruginosa

Zhong

Yang

Qin

et al. 2019

Ann. Limnol. - Int. J. Lim.

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Mixing is an integral environmental factor that affects lake ecosystems. For the cyanobacterium Microcystis, colony size is important with respects to migration velocity, how cells respond to grazing pressure, light attenuation, nutrient uptake and growth. To understand how mixing shapes colony size and the growth of Microcystis, we measured the effects of different current velocities (0, 0.16, 0.32, 0.64, and 1.28 m s−1) on M. aeruginosa in Lake Taihu. After 24 h of continuous mixing, the mean colony sizes of M. aeruginosa in the controls, 0.16, 0.32, 0.64, and 1.28 m s−1 groups were 23.6, 50.1, 92.9, 67.8, and 37.3 μm, respectively. Colony sizes of M. aeruginosa in all treatment groups were significantly larger than those in controls. As well, the concentration of soluble extracellular polysaccharide and bound extracellular polysaccharides of M. aeruginosa in all treatment groups were significantly higher than those in controls. Except for the highest level of mixing (1.28 m s−1), the growth rate of M. aeruginosa was significantly higher than that in controls. This study suggested that mixing intensity over short time periods can significantly influence colony size and the growth of M. aeruginosa.

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“…Mechanical mixing with the disc generated the highest zooplankton biomass, and an air-lift system generated a lower proportion of small flagellates, but otherwise, all methods gave the same community composition of phytoplankton and zooplankton. From mesocosm studies in Lake Thaihu, Zhou et al (2016a) showed that the turbulence level had a strong impact on the structure of the zooplankton community, with a shift from the dominance of large-sized crustaceans to small-sized rotifers with increased turbulence. High turbulence also suppressed the zooplankton growth and biomass.…”

Section: Discussionmentioning

confidence: 99%

An indoor pelagic mesocosm facility to simulate multiple water-column characteristics

Båmstedt¹,

Larsson²

2018

Int Aquat Res

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Mesocosms are important research tools in aquatic ecology because they close the gap between laboratory studies at the individual or lower organization level and field studies at the population and ecosystem level. However, most mesocosm studies regarding the pelagic environment do not consider the effects of physical factors like water-column stratification, turbulence and mixing. Neglecting such factors might bias the results compared to the natural system. Using a unique indoor mesocosm facility, we present results on how different water-column stratifications can be made and how they act as barriers for exchange between water layers. Turbulent mixing, simulated by vertically rotating incubation vessels, is shown to be of high importance for primary production, generating up to nine times higher production in humus-rich water than incubation vessels at fixed depths. Convective stirring is shown to be an attractive method for generating different turbulence conditions, and different temperature settings can be used to get turnover times from 84 h or more down to 17 min for a 5-m water parcel. We also demonstrate how an anoxic bottom layer can be achieved by stimulating heterotrophic bacteria through addition of bioavailable organic carbon.

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Response of zooplankton community to turbulence in large, shallow Lake Taihu: a mesocosm experiment

Cited by 20 publications

References 0 publications

Rotifer communities under variable predation-turbulence combinations

Rotifer communities under variable predation-turbulence combinations

Effects of mixing intensity on colony size and growth ofMicrocystis aeruginosa

An indoor pelagic mesocosm facility to simulate multiple water-column characteristics

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