Modélisation de dynamiques spatiales et de relations locales de densité-dépendance chez des populations de poissons : détections de catactéristiques à l'échelle globale
TL;DR: In this paper, a population of poissons geniteurs is simulee dans un environnement artificiel composed of 20 x 20 cellules hexagonales, the cellule represente l'echelle locale and l'environnements l'EChelle globale.
About: This article is published in Aquatic Living Resources.The article was published on 1998-01-01 and is currently open access. It has received 8 citations till now.
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TL;DR: This work considers modelling and other applications, including the role of nearest neighbourhood in experimental design, the representation of connectivity in maps, and a new method for performing field surveys using hexagonal grids, which was demonstrated on montane heath vegetation.
385 citations
TL;DR: Two individual-based models for the movement of elvers in the French river ‘Adour’ are built and a set of stochastic differential equations and a partial differential equation for the elvers’ density are rigorously obtained.
25 citations
TL;DR: Tamdrari et al. as mentioned in this paper studied the relationship between local density and population abundance of Atlantic cod in the northern Gulf of St Lawrence (Canada) over its entire area (4RS) and also within a subarea (4R) where the stock has concentrated since it collapsed during the early 1990s.
Abstract: Tamdrari, H., Castonguay, M., Brethes, J-C., and Duplisea, D. 2010. Density-independent and -dependent habitat selection of Atlantic cod (Gadus morhua) based on geostatistical aggregation curves in the northern Gulf of St Lawrence. - ICES Journal of Marine Science, 67: 000-000. Relationships were sought between local density and population abundance of Atlantic cod (Gadus morhua) in the northern Gulf of St Lawrence (Canada) over its entire area (4RS) and also within a subarea (4R) where the stock has concentrated since it collapsed during the early 1990s. Relationships were analysed using geostatistical aggregation curves computed within the two areas between years of contrasting abundance levels. The curves were interpreted in terms of four conceptual models of spatial dynamics: models D1 and D2, forced mainly by environmental heterogeneity, and models D3 and D4, in which individual behaviour is influenced by local density. Over the entire area, the cod population follows the D2 model for all years and age groups, and it is influenced by abiotic factors. Within the subarea, all four models applied, and the density-dependent basin model (D4) dominated from 2006 to 2008. The year 2006 seems to be pivotal because it coincides with the expansion of the cod population into its former area in the western Gulf (4S).
24 citations
TL;DR: This work examined how the distribution of Atlantic cod is influenced by abiotic (temperature, salinity, depth, suitable habitat) and biotic (stock biomass) factors based on tagging−recaptu...
Abstract: We examined how the distribution of Atlantic cod (Gadus morhua) is influenced by abiotic (temperature, salinity, depth, suitable habitat) and biotic (stock biomass) factors based on tagging−recaptu...
16 citations