20 papers · ranked by Valyu relevance
Marcelo A. Pires, Sílvio M. Duarte Queirós, Sergio Gómez
We introduce a minimal agent-based model to understand the effects of the interplay between dispersal and geometric constraints in metapopulation dynamics under the Allee Effect. The model, which does not impose nonlinear birth and death rates, is studied both analytically and numerically. Our results indicate the…
Gloria M. Luque, Chloé Vayssade, Benoît Facon, Thomas Guillemaud + 2 more
The Allee effect is a theoretical model predicting low growth rates and the possible extinction of small populations. Historically, studies of the Allee effect have focused on demography. As a result, underlying processes other than the direct effect of population density on fitness components are not generally taken…
Félix Foutel-Rodier, Alison Etheridge
During a range expansion, deleterious mutations can “surf” on the colonisation front. The resultant decrease in fitness is known as expansion load. An Allee effect is known to reduce the loss of genetic diversity of expanding populations, by changing the nature of the expansion from “pulled” to “pushed”. We study the…
Jennifer L. Stenglein, Timothy R. Van Deelen, Joseph K. Bump
Recovering populations of carnivores suffering Allee effects risk extinction because positive population growth requires a minimum number of cooperating individuals. Conservationists seldom consider these issues in planning for carnivore recovery because of data limitations, but ignoring Allee effects could lead to…
Daniel C.P. Jorge, Ricardo Martinez-Garcia
Intraspecific interactions are key drivers of population dynamics because they establish relations between individual fitness and population density. The component Allee effect is defined as a positive correlation between any fitness component of a focal organism and population density, and it can lead to positive…
Nabil T. Fadai, Matthew J. Simpson
The Allee effect describes populations that deviate from logistic growth models and arises in applications including ecology and cell biology. A common justification for incorporating Allee effects into population models is that the population in question has altered growth mechanisms at some critical density, often…
Elena Angulo, Greg S A Rasmussen, David W Macdonald, Franck Courchamp
'Franck Courchamp'] Background Allee effects may arise as the number of individuals decreases, thereby reducing opportunities for cooperation and constraining individual fitness, which can lead to population decrease and extinction. Obligate cooperative breeders rely on a minimum group size to subsist and are thus…
Yun Kang
In this article, we propose and study a generalized Beverton-Holt competition model subject to Allee effects to obtain insights on how the interplay of Allee effects and contest competition affects the persistence and the extinction of two competing species. By using the theory of monotone dynamics and the properties…
Jonathan Berger, Meike J. Wittmann
The Allee effect is a phenomenon where individual fitness is reduced in small populations, for example because of mate-finding difficulties or increased predation. Allee effects matter in conservation biology because they can drive small populations to extinction. The severity of Allee effects can depend on traits such…
Daniel Cardoso Pereira Jorge, Ricardo Martínez‐García
Intraspecific interactions are key drivers of population dynamics because they establish relations between individual fitness and population density. The component Allee effect is defined as a positive correlation between any fitness component of a focal organism and population density, and it can lead to positive…
Péter K. Molnár, Mark A. Lewis, Andrew E. Derocher, Matt Hayward
Allee effects are an important component in the population dynamics of numerous species. Accounting for these Allee effects in population viability analyses generally requires estimates of low-density population growth rates, but such data are unavailable for most species and particularly difficult to obtain for large…
Lijuan Qin, Feng Zhang, Wanxiong Wang, Weixin Song + 1 more
Understanding Allee effect has crucial importance for ecological conservation and management because it is strongly related to population extinction. Due to various ecological mechanisms accounting for Allee effect, it is necessary to study the influence of multiple Allee effects on the dynamics and persistence of…
Marcelo A. Pires, Sı́lvio M. Duarte Queirós
How diffusion impacts on ecological dynamics under the Allee effect and spatial constraints? That is the question we address. Employing a microscopic minimal model in a metapopulation (without imposing nonlinear birth and death rates) we evince — both numerically and analitically — the emergence of an optimal diffusion…
Chengyi Tu, Fabio Menegazzo, Paolo D'Odorico, Samir Suweis
sustainability Authors: ['Chengyi Tu' 'Fabio Menegazzo' "Paolo D'Odorico" 'Samir Suweis'] The management of common-pool resources is a complex challenge due to the risk of overexploitation and the tragedy of the commons. A novel framework has been introduced to address this issue, focusing on the coevolutionary…
Meike J. Wittmann, Hanna Stuis, Dirk Metzler
It is now widely accepted that genetic processes such as inbreeding depression and loss of genetic variation can increase the extinction risk of small populations. However, it is generally unclear whether extinction risk from genetic causes gradually increases with decreasing population size or whether there is a sharp…
Hu, Junhui
Endangered populations often experience limited growth ability at low densities, a phenomenon described by the Allee effect. In this thesis, we investigate a predator–prey model incorporating the Allee effect within a two-dimensional nonlinear reaction–diffusion framework, with the aim of understanding how local…
Philip Erm, Ben L. Phillips
Understanding the dynamics of biological invasions is crucial for managing numerous phenomena, from invasive species to tumours. While Allee effects (where individuals in low-density populations suffer lowered fitness) are known to influence both the ecological and evolutionary dynamics of invasions, the possibility…
Meike J. Wittmann, Wilfried Gabriel, Dirk Metzler
A phenomenon that strongly influences the demography of small introduced populations and thereby potentially their genetic diversity is the Allee effect, a reduction in population growth rates at small population sizes. We take a stochastic modeling approach to investigate levels of genetic diversity in populations…
Özgür Gültekin, Çağatay Eskin, E. Yazicioglu
A detailed examination of the effect of harvesting on a population has been carried out by extending the standard cubic deterministic model by considering a population under Allee effect with a quadratic function representing harvesting. Weak and strong Allee effect transitions, carrying capacity, and Allee threshold…
Authors not listed
The efficiency of solar-to-energy conversion in semiconductors is limited by charge carrier recombination, often via defect-induced gap states. Although some materials exhibit an intrinsic defect tolerance that avoids fast recombination channels, there are few examples for metal oxides. We investigate the…