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Combined effects of temperature and prey (Brachionus angularis) density on life-table demography and population growth of Asplanchna brightwelli (Rotifera)

Published online by Cambridge University Press:  08 October 2014

Ling Pan ,
Yi-Long Xi ,
Hong-Yuan Cao ,
Bin Peng  and
Jin-Xia Wang
Ling Pan
Affiliation:
Provincial Laboratory for Conservation and Utilization of Important Biological Resource in Anhui, College of Life Sciences, Anhui Normal University, Wuhu 241000, Anhui, P. R. China
Yi-Long Xi*
Affiliation:
Provincial Laboratory for Conservation and Utilization of Important Biological Resource in Anhui, College of Life Sciences, Anhui Normal University, Wuhu 241000, Anhui, P. R. China
Hong-Yuan Cao
Affiliation:
Provincial Laboratory for Conservation and Utilization of Important Biological Resource in Anhui, College of Life Sciences, Anhui Normal University, Wuhu 241000, Anhui, P. R. China
Bin Peng
Affiliation:
Provincial Laboratory for Conservation and Utilization of Important Biological Resource in Anhui, College of Life Sciences, Anhui Normal University, Wuhu 241000, Anhui, P. R. China
Jin-Xia Wang
Affiliation:
Provincial Laboratory for Conservation and Utilization of Important Biological Resource in Anhui, College of Life Sciences, Anhui Normal University, Wuhu 241000, Anhui, P. R. China
*
*Corresponding author: ylxi1965@126.com
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Abstract

Predator–prey interactions play major and direct roles in the structuring of zooplankton communities. Asplanchna usually predates ciliates, rotifers, cladocerans and sometimes even copepods, its predation may drive not only the ecological, but also the evolutionary dynamics of prey populations. In the present study, the life-table demography and the population growth of Asplanchna brightwelli were investigated at four temperatures (16, 20, 24 and 28°C) using Brachionus angularis as prey at four densities (10, 20, 30 and 40 ind.mL−1). The results showed that temperature affected significantly all the life-table demographic parameters (age-specific survivorship and fecundity, average lifespan, life expectancy at hatching, generation time, net reproductive rate and intrinsic rate of population increase) and the population growth rate obtained from the population growth studies, prey density affected the generation time, the net reproductive rate, the intrinsic rate of population increase and the population growth rate, and the interaction between temperature and prey density affected the generation time and the population growth rate. Both the average lifespan and the life expectancy at hatching were the longest at 16°C, the generation times were longer at lower temperatures (16 and 20°C) and higher prey densities (30 and 40 ind.mL−1), the net reproductive rates were higher at lower temperatures (16 and 20°C) and 20–40 ind.mL−1 of B. angularis, and the population growth rates were higher at 20°C under 20–40 ind.mL−1 of B. angularis.

Keywords

Asplanchna brightwellilife historypopulation growthtemperatureBrachionus angularis density
Type
Research Article
Information
Annales de Limnologie - International Journal of Limnology , Volume 50 , Issue 4 , 2014 , pp. 261 - 268
Copyright
© EDP Sciences, 2014

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