Evolutionary individual-based model for the recruitment of anchovy (Engraulis capensis) in the southern Benguela

$50.00 plus tax (Refund Policy)

Buy Article:

Abstract:

Evolutionary simulations are developed to explore environmental constraints that select observed spatial and temporal spawning patterns for anchovy (Engraulis capensis) in the southern Benguela. They couple a realistic three-dimensional hydrodynamic model with an individual-based model in which an evolutionary-based reproductive strategy for adult fish and a passive transport for early life stages are implemented. The evolutionary success of spawning is quantified when patterns at the population level emerge after many generations from constraints at the individual level through a selective process. As a result, several self-sustaining populations are identified considering different sets of selective constraints. Simulated spawning patterns better match the observed mean spawning pattern when two selective environmental constraints are associated: a threshold temperature of 14°C, above which the development of early life stages is ensured, and the avoidance of offshore currents that constitute a loss of spawning products. Simulated recruitment patterns are more realistic when considering the constraint of reaching the nursery area. This modeling experience can help to identify, temporally and spatially, environmental factors important for fish recruitment and to establish a hierarchy of these factors. The probable coexistence in nature of several self-sustaining populations of pelagic fishes is shown to be important for recruitment studies.

Nous avons mis au point des simulations évolutives pour étudier les contraintes environnementales qui agissent sur la sélection des comportements de ponte que l'on observe chez l'anchois (Engraulis capensis) dans le sud Benguela. Les simulations associent un modèle hydrodynamique 3-D avec un modèle centré sur l'individu; elles représentent les effets évolutifs du couplage entre la stratégie de reproduction des adultes et le transport passif lors des jeunes stades (oeufs et larves). Nous nous intéressons à l'apparition au niveau de la population de patterns spatio-temporels de ponte causés par un processus de sélection dans lequel des contraintes s'exercent au niveau individuel pendant plusieurs générations. Plusieurs populations autosuffisantes, correspondant à ces patterns, peuvent être identifiées et associées à différentes séries de contraintes évolutives. Les patterns de ponte simulés s'accordent mieux avec le pattern de ponte observé lorsque deux contraintes sélectives de l'environnement sont associées: un seuil de température de 14°C et l'évitement des courants au large. Les patterns de recrutement simulés sont plus réalistes si on tient compte de la nécessité d'atteindre la zone de nourricerie. Une telle expérience de modélisation aide à identifier dans le temps et l'espace les facteurs environnementaux les plus importants pour le recrutement et à les hiérarchiser. Il nous apparaît alors que la coexistence probable en nature de plusieurs populations autosuffisantes de poissons pélagiques est un facteur important à considérer dans les études sur le recrutement.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: May 1, 2002

More about this publication?
  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
  • Information for Authors
  • Submit a Paper
  • Subscribe to this Title
  • Terms & Conditions
  • Sample Issue
  • Reprints & Permissions
  • ingentaconnect is not responsible for the content or availability of external websites
Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more