منابع مشابه
Weak Allee effects and species coexistence
In this article, we study the population dynamics of a two-species discrete-time competitionmodelwhere each species suffers from either predator saturation induced Allee effects and/or mate limitation induced Allee effects. We focus on the following two possible outcomes of the competition: 1. one species goes to extinction; 2. the system is permanent. Our results indicate that, even if one spe...
متن کاملAllee effects, invasion pinning, and species' borders.
All species' ranges are the result of successful past invasions. Thus, models of species' invasions and their failure can provide insight into the formation of a species' geographic range. Here, we study the properties of invasion models when a species cannot persist below a critical population density known as an "Allee threshold." In both spatially continuous reaction-diffusion models and spa...
متن کاملAllee effects in ants.
1. Allee effects occur when the aggregation of individuals result in mutually beneficial intraspecific interactions whereby individual fitness, or per capita growth rate, increases with the number of individuals. Allee effects are common in social species due to their cooperative behaviours, such as breeding, feeding or defence. Allee effects have important implications for many aspects of basi...
متن کاملAllee effects, immigration, and the evolution of species' niches.
Theoretical studies of adaptation to sink environments (with conditions outside the niche requirements of a species) have shown that immigration from source habitats can either facilitate or inhibit local adaptation. Here, we examine the influence of immigration on the evolution of local adaptation, given an Allee effect (i.e., at low densities, absolute fitness increases with population densit...
متن کاملDynamics of a single species evolutionary model with Allee effects
We investigate the evolutionary outcomes of a single species population subject to Allee effects within the framework of a continuous strategy evolutionary game theory (EGT) model. Our model assumes a single trait creates a phenotypic trade-off between carrying capacity (i.e., competition) and predator evasion ability following a Gaussian distribution. This assumption contributes to one of our ...
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ژورنال
عنوان ژورنال: Journal of Animal Ecology
سال: 2017
ISSN: 0021-8790,1365-2656
DOI: 10.1111/1365-2656.12759