Allee effect - Wikipedia
The strong Allee effect is a demographic Allee effect with a critical population size or density. The weak Allee effect is a demographic Allee effect without a critical population size or density. The distinction between the two terms is based on whether or not the population in question exhibits a critical population size or density .
Allee Effects | Learn Science at Scitable - Nature
Allee effects that cause critical population sizes are called strong, while Allee effects that do not result in critical sizes are called weak. Other names for the Allee effect are...
Unpacking the Allee effect: determining individual-level …
The Allee effect typically takes one of two forms, depending on the behaviour at low densities: (i) the Strong Allee effect, describing negative per capita growth below some critical density threshold (figure 1d), resulting in the extinction of the population below this threshold, and; (ii) the Weak Allee effect, describing a reduced, but ...
Abstract: We describe the dynamics of an evolutionary model for a population subject to a strong Allee effect. The model assumes the carrying capacity k (u), inherent growth rate r (u), and Allee threshold a (u) are functions of a mean phenotypic trait. u subject to evolution.
Mathematical modeling of population dynamics with Allee effect …
2016年2月15日 · Strong Allee effect can induce a critical density below which per capita growth rate is negative and extinction tends to occur, while weak Allee effect may result in reduced, but still positive, growth rate as population size or density decreases .
Allee effect: the story behind the stabilization or extinction of ...
2016年11月25日 · Graphical illustrations of Allee effect. The graph represents weak Allee effect and strong Allee effect in comparison with the logistic growth curve
Generalized Allee effect model | Theory in Biosciences - Springer
2014年3月17日 · The strong Allee effect is observed, beyond the reduction of colony size, has led to an increase in the inter-colony distances and opened up space for possible mechanisms for Allee effects, including impaired mate-finding, reduced predator detection/avoidance and reduced foraging (Brashares et al. 2010). According to authors, the reduction in ...
Evolutionary dynamics and strong Allee effects - Taylor
2012年7月4日 · An Allee effect is called strong, if it results in the stability of extinction equilibrium x =0 in a model with a stable positive equilibrium. This bistability is the defining hallmark of a strong Allee effect and is a property that is often of central interest in studies of Allee effects.
Allee Effect - an overview | ScienceDirect Topics
Allee effects, named after the scientist W.C. Allee, are beneficial effects of conspecific interactions upon individuals. These benefits to reproduction, growth, and survival may generate behavioral effects, including preferences for living near other individuals.
The influence of density in population dynamics with strong …
2021年2月4日 · In this paper, our main goal is to evoke the importance of Allee effect in reaction-diffusion equation and show how it effects populations in ecology. We study the impact of multiplicative Allee effect in classical diffusion when the sparsity is either positive or negative.
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