Influence of activity in a heterogeneous environment on the dynamics of fish growth: an individual-based model of roach

Authored by Broder Breckling, F Holker

Date Published: 2002

DOI: 10.1006/jfbi.2002.1929

Sponsors: German Ministries

Platforms: Simula

Model Documentation: Other Narrative Flow charts

Model Code URLs: Model code not found

Abstract

A spatio-temporal individual-based model (IBM), including bioenergetic principles, is used to investigate how energy costs coupled to activity represent a variable fraction in a heterogeneous environment and how this is related to another energetic criterion, the potential individual growth, under the conditions of a structured environment. With this approach, it is possible to connect simulated spatio-temporal activity patterns with the energetic needs required for these activities. By using simple foraging rules and a modified random walk model it is possible to reproduce spatial distributions and length frequency distributions. The simulated spatial distribution of roach Rutilus rutilus in Lake Belau, Germany, results in a mean weekly activity multiplier {[}(standard metabolic rate+activity costs) (standard metabolic rate)(-1)] of 1.9 with deviations >100\%) during a simulated year. These deviations are of key importance to differences in the growth rate of individual simulated roach. (C) 2002 The Fisheries Society of the British Isles. Published by Elsevier Science Ltd. All rights reserved.

Tags

behavior habitat Temperature Trout Rutilus-rutilus l Cyprinidae