AN OPTIMAL FORAGING AND MIGRATION MODEL FOR JUVENILE PLAICE

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

A state-dependent model has been used to predict daily and tidal patterns of migration, feeding and inactivity in juvenile plaice (Pleuronectes platessa L.) in their intertidal and shallow subtidal nursery areas. Vertical position, quantity of energy reserves and fullness of the gut characterized the state of individual fishes. If feeding is visually mediated, the model predicts that, by night, plaice should move to areas of low predation risk and become inactive, whereas by day, plaice should migrate to feed in areas of high prey encounter rate. Vertical zones adopted by day and night and, hence, patterns of migration, should depend on the distributions of predators and prey. When prey are more abundant in the intertidal zone, plaice should move onshore to feed as the tide rises and when prey are more abundant offshore, plaice should move offshore to feed by day. If predators are equally abundant in all zones, the fish should behave as if no predators were present, having no effective refuge. An increase in the abundance of predators with depth results in the restriction of plaice activities to shallower vertical zones, depending on the magnitude of the predation threat. Zones adopted thus depend on the trade-off between energy intake and predation risk. Concordance between predicted behaviour and observed patterns is evident in contrasting habitats. Migration and feeding in the Wadden Sea, where prey are more abundant on intertidal flats, is dominated by the tidal component, whereas on impoverished exposed beaches of the west coast of Scotland, the diurnal component is dominant. Tidally related behaviour persists in the latter environment, not predicted by the model and may be a consequence of using endogenous rhythms to approach optimal behavioural patterns.
Original languageEnglish
Pages (from-to)125-149
Number of pages25
JournalEVOL ECOL
Volume8
Issue number2
Publication statusPublished - 1994

Keywords

  • BEHAVIORAL DECISIONS
  • Ecology
  • DIEL VERTICAL MIGRATION
  • PLEURONECTES-PLATESSA POPULATION
  • PREDATION
  • ECOLOGY
  • Evolutionary Biology
  • Genetics & Heredity
  • RISK
  • FLATFISH
  • WESTERN WADDEN SEA
  • ZOOPLANKTON

Fingerprint Dive into the research topics of 'AN OPTIMAL FORAGING AND MIGRATION MODEL FOR JUVENILE PLAICE'. Together they form a unique fingerprint.

Cite this