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Influence of activity in a heterogeneous environment on the dynamics of fish growth: an individual‐based model of roacl
Author(s) -
Hölker F.,
Breckling B.
Publication year - 2002
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.2002.tb01713.x
Subject(s) - rutilus , foraging , biology , bioenergetics , standard deviation , ecology , growth rate , fish <actinopterygii> , biological system , statistics , mathematics , fishery , geometry , mitochondrion , microbiology and biotechnology
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.