Seasonal and genotypic influences on life cycle synchronisation: further insights from annual squid

Authored by EPM Grist, Clers S des

Date Published: 1999

Sponsors: No sponsors listed

Platforms: No platforms listed

Model Documentation: Other Narrative Mathematical description

Model Code URLs: Model code not found

Abstract

We consider a simple individual-based model which incorporates a two stage growth response for squid hatchlings in continual exposure to seasonal fluctuations of temperature. In the first stage of growth an individual increases rapidly in size at a temperature-dependent rate. After a fixed period of time, an abrupt transition occurs to a temperature-independent growth rate: which is maintained for the rest of the lifespan. In exposure to seasonally fluctuating temperatures such a growth mechanism is shown to directly induce phenotypic variability. By assuming that an individual's developmental progress is related to the same phenotypic trait, we are able to consider the temporal dynamics generated. Stochastic simulations show that provided genotypic variability is low, synchronisation can be maintained only by recruitment to a single population occurring up to (at most) a few times of year. (C) 1999 Elsevier Science B.V. All rights reserved.

Tags

growth Population-structure History Waters Sexual-maturation Loligo-gahi