Diel vertical migration: Modelling light-mediated mechanisms

Richards, SA, Possingham, HP and Noye, J (1996) Diel vertical migration: Modelling light-mediated mechanisms. Journal of Plankton Research, 18 12: 2199-2222. doi:10.1093/plankt/18.12.2199

Author Richards, SA
Possingham, HP
Noye, J
Title Diel vertical migration: Modelling light-mediated mechanisms
Journal name Journal of Plankton Research   Check publisher's open access policy
ISSN 0142-7873
Publication date 1996-01-01
Sub-type Article (original research)
DOI 10.1093/plankt/18.12.2199
Open Access Status DOI
Volume 18
Issue 12
Start page 2199
End page 2222
Total pages 24
Language eng
Abstract Light is generally regarded as the most likely cue used by zooplankton to regulate their vertical movements through the water column. However, the way in which light is used by zooplankton as a cue is not well understood. In this paper we present a mathematical model of diel vertical migration which produces vertical distributions of zooplankton that vary in space and time. The model is used to predict the patterns of vertical distribution which result when animals are assumed to adopt one of three commonly proposed mechanisms for vertical swimming. First, we assume zooplankton tend to swim towards a preferred intensity of light. We then assume zooplankton swim in response to either the rate of change in light intensity or the relative rate of change in light intensity. The model predicts that for all three mechanisms movement is fastest at sunset and sunrise and populations are primarily influenced by eddy diffusion at night in the absence of a light stimulus. Daytime patterns of vertical distribution differ between the three mechanisms and the reasons for the predicted differences are discussed. Swimming responses to properties of the light field are shown to be adequate for describing diel vertical migration where animals congregate in near surface waters during the evening and reside at deeper depths during the day. However, the model is unable to explain how some populations halt their ascent before reaching surface waters or how populations re-congregate in surface waters a few hours before sunrise, a phenomenon which is sometimes observed in the held. The model results indicate that other exogenous or endogenous factors besides light may play important roles in regulating vertical movement.
Keyword Marine & Freshwater Biology
Northwestern Mediterranean-sea
Chaoborus-punctipennis Larvae
Partially Mixed Estuary
Tidal Currents
Fish Larvae
Shrimp Larvae
Coral Reefs
Crab Larvae
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: AEDA Publications
Spatial Ecology Lab Publications
School of Biological Sciences Publications
Ecology Centre Publications
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Citation counts: TR Web of Science Citation Count  Cited 28 times in Thomson Reuters Web of Science Article | Citations
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Created: Tue, 14 Aug 2007, 02:35:59 EST