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 · We describe the dynamics of an evolutionary model for a population subject to a strong Allee effect. The model assumes that 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.
Unpacking the Allee effect: determining individual-level …
By introducing a stochastic individual-based model, with proliferation, death and motility rates that depend on local density, we present a modelling framework that translates particular global Allee effects to specific individual-based mechanisms.
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.
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 .
graphic Allee effect is defined as a positive correlation between the total fitness and population size. Here, we address only the demographic Allee effect. In this case, there is a distinction between the so-called strong and weak Allee effects. The strong Allee effect has a crit-ical population size, the Allee threshold. This threshold
We describe the dynamics of an evolutionary model for a population subject to a strong Allee effect. The model assumes that 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.
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...
We focus on empirical signatures that are used or might be used to detect Allee effects, the types of data in which Allee effects are evident, the empirical support for the occurrence of critical densities in natural populations, and differences among taxa both in the presence of Allee effects and primary causal mechanisms.
In the absence of the Allee effect, the fitness is expected to decrease when the population increases, most likely as the result of inter-specific competition, difficulty in finding mates, or/and limitation of resources. On the other hand, a strong Allee effect is exhibited by an increase in per-capita growth with increasing population size.