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Journal of Plankton Research Vol.25 no.9 pp.1069-1077, 2003
© Oxford University Press 2003

Diel vertical migration of zooplankton following optimal food intake under predation

Shun-Hui Liu1,2, Song Sun1 and Bo-Ping Han1,2,*

1 Department of Marine Ecology, Institute of Oceanography, Chinese Academy of Sciences, Qingdao 266071 and 2 Institute of Hydrobiology, Jinan University, Guangzhou 510632, P. R. China

* Corresponding Author: tbphan{at}ms.qdio.ac.cn

A model is developed to investigate the trade-offs between benefits and costs involved in zooplanktonic diel vertical migration (DVM) strategies. The ‘venturous revenue’ (VR) is used as the criterion for optimal trade-offs. It is a function of environmental factors and the age of zooplankter. During vertical migration, animals are assumed to check instantaneously the variations of environmental parameters and thereby select the optimal behavioral strategy to maximize the value of VR, i.e. taking up as much food as possible with a certain risk of mortality. The model is run on a diel time scale (24 h) in four possible scenarios during the animal’s life history. The results show that zooplankton can perform normal DVM balancing optimal food intake against predation risk, with the profile of DVM largely modified by the age of zooplankter.


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