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JOURNAL OF PLANKTON RESEARCH | VOLUME 20 | NUMBER 8 | PAGES 1463-1487 | 1998
© Oxford University Press

research-article

Modeling patterns of zooplankton diel vertical migration

Bo-Ping Han1,2 and Milan Straskraba1,3

1Biomathematical Laboratory, Czech Academy of Science and Biological Faculty, University of South Bohemia Branisovská. 31,370 05 Ceské Budejovice, Czech Republic 2Institute of Hydrobiology, Jinan University Guangzhou 510632, China

3To whom correspondence should be addressed

Received on November 16, 1997; accepted on April 2, 1998 Realized predation pressure, defined as the product of predation pressure and light intensity, expresses the mortality pressure due to visual predation. The part of realized predation pressure which is sensed by organisms is here considered to be related to food level and temperature. This partly realized predation pressure is referred to as sensed predation pressure. We propose a possible control mechanism of diel vertical migration (DVM): organisms move vertically following the minimum change in sensed predation pressure. To investigate this assumption, we present a math ematical model of DVM. We assume that when predators are present, the food level is above a minimal level, and temperature is higher than the tolerance of organisms to growth, prey organisms undertake DVM following the minimum change in sensed predation pressure. We examine how patterns of migration may be affected by changes in water clarity, predation pressure, food level and temperature. This work supports the assumption that minimizing changes in sensed predation pressure can explain the wide variation in the vertical profile of zooplankton.


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