Using an individual-based model with four trophic levels to model the effect of predation and competition on squid recruitment

Authored by Matteo Sinerchia, Anthony J Field, John D Woods, Silvana Vallerga, Wes R Hinsley

Date Published: 2012

DOI: 10.1093/icesjms/fsr190

Sponsors: International Council of the Exploration of the Sea (ICES) Consiglio Nazionale delle Ricerche

Platforms: No platforms listed

Model Documentation: ODD Flow charts

Model Code URLs: Model code not found

Abstract

The Lagrangian Ensemble recruitment model (LERM) is the first prognostic model of fisheries recruitment based upon individuals. It incorporates five functional groups: phytoplankton (diatoms), herbivorous zooplankton (copepods), carnivorous zooplankton (squid paralarvae), and two top predators. Physiology and behaviour are described by equations derived from literature based on reproducible laboratory experiments. LERM is built using the Lagrangian Ensemble metamodel, in which the demography and biofeedback of each dynamic population are diagnostic properties, emerging from the life histories of individuals. The response of the plankton ecosystem and squid recruitment to different scenarios of exogenous forcing is investigated. Simulations were run at 41 degrees N 27 degrees W (Azores) under a stationary annual cycle of atmospheric forcing. The ecosystem adjusts to a stable attractor for each scenario. The emergent properties of each attractor are investigated, with focus on predation, competition for food, and spawning magnitude. Annual recruitment is a complex emergent property dependent on several factors, including food availability, predation, competition, and post-hatching growth rate, as proposed by Hjort's critical period theory, relating recruitment to predation mortality, depending on growth rate and hence food availability. The model provides a useful step towards linking small-scale processes governing the life histories of larvae and fisheries on the large scale.
Tags
fisheries Phytoplankton growth Stock Temperature Dynamic-model Plankton ecosystem Falkland islands Loligo-gahi Larval fish