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Responses in population growth and reproduction of the freshwater rotifer Brachionus calyciflorus to microcystin-LR at different temperatures

Published online by Cambridge University Press:  17 December 2012

Lin Huang ,
Yilong Xi ,
Xiaoping Xu  and
Xinli Wen
Lin Huang
Affiliation:
Provincial Key Laboratories of Conservation and Utilization for Important Biological Resource in Anhui and Biotic Environment and Ecological Safety, College of Life Sciences, Anhui Normal University, Wuhu, Anhui 241000, China College of Biological and Pharmaceutical Engineering, WestAnhui University, Lu'an, Anhui 237012, China
Yilong Xi*
Affiliation:
Provincial Key Laboratories of Conservation and Utilization for Important Biological Resource in Anhui and Biotic Environment and Ecological Safety, College of Life Sciences, Anhui Normal University, Wuhu, Anhui 241000, China
Xiaoping Xu
Affiliation:
Provincial Key Laboratories of Conservation and Utilization for Important Biological Resource in Anhui and Biotic Environment and Ecological Safety, College of Life Sciences, Anhui Normal University, Wuhu, Anhui 241000, China
Xinli Wen
Affiliation:
Provincial Key Laboratories of Conservation and Utilization for Important Biological Resource in Anhui and Biotic Environment and Ecological Safety, College of Life Sciences, Anhui Normal University, Wuhu, Anhui 241000, China
*
*Corresponding author: [email protected]
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Abstract

Microcystis blooms occur worldwide in eutrophic lakes. Microcystins (MCs) including microcystin-LR (MC-LR) released by Microcystis have adverse effects on aquatic organisms such as rotifers. To detect population growth and reproductive responses, the rotifer Brachionus calyciflorus was exposed to MC-LR at eight concentrations ranging from 0 to 200 μg.L−1 under different temperature (20, 25 and 30°C), and population growth rate (r), ovigerous females/non-ovigerous females (OF/NOF) ratio, mictic females/amictic females (MF/AF) ratio, mictic rate (MR), and 7-d resting egg (7-d RE) production were investigated. The results showed that higher temperatures stimulate the population growth of B. calyciflorus. B. calyciflorus showed high tolerance to MC-LR at concentrations lower than 200 μg.L−1 under different temperatures. Compared to the control, MC-LR at all concentrations increased the r (P<0.05), but decreased the OF/NOF and the MR of the rotifers at 30°C (P<0.01). A clear dose–response relationship existed between the r, the OF/NOF, and the MR of B. calyciflorus and MC-LR concentration at 30°C, respectively. These sensitive parameters could be used to monitor the ecological effects of low concentrations of MC-LR in natural water bodies at the high temperature.

Keywords

RotiferBrachionus calyciflorusMicrocystins-LRTemperatureReproduction parameters
Type
Research Article
Information
Annales de Limnologie - International Journal of Limnology , Volume 48 , Issue 4 , 2012 , pp. 383 - 390
Copyright
© EDP Sciences, 2012

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