Results 201 to 210 of about 42,411 (234)

The evidence for Allee effects

Population Ecology, 2009
AbstractAllee effects are an important dynamic phenomenon believed to be manifested in several population processes, notably extinction and invasion. Though widely cited in these contexts, the evidence for their strength and prevalence has not been critically evaluated.
Kramer, Andrew M., Dennis, Brian, Liebhold, Andrew M., Drake, John M.   +3 more
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Competition models with Allee effects

Journal of Difference Equations and Applications, 2014
In this paper, we study a generalized two-species contest-competition model with an Allee effect. We provide a complete analysis of the global dynamics of the system. In particular, we determine all the invariant manifolds, the extinction, the exclusion and the coexistence regions.
G. Livadiotis, L. Assas, S. Elaydi, E. Kwessi, D. Ribble   +4 more
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Allee effects under climate change

Oikos, 2019
Understanding how climate change affects population dynamics is crucial for assessing future of biodiversity. Here I ask how can Allee effects, occurring when mean individual fitness is reduced in rare populations, respond to increasing temperature.
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Allee effects on population dynamics with delay

Chaos, Solitons & Fractals, 2008
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Merdan, Hüseyin, Çelik, Canan, Duman, O., Akın, Ömer   +3 more
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Population dispersal and Allee effect

Ricerche di Matematica, 2016
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Hunting cooperation and Allee effects in predators

Journal of Theoretical Biology, 2017
Cooperation is a ubiquitous behavior in many biological systems and is well-known for promoting Allee effects. However, few studies have paid attention to mechanisms inducing Allee effects in predators. Here, we focus on hunting cooperation and use a classical predator-prey system for identifying the impact of this mechanism.
Teixeira Alves, Mickaël, Hilker, Frank M.   +1 more
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Allee effects in stochastic populations

Oikos, 2002
The Allee effect, or inverse density dependence at low population sizes, could seriously impact preservation and management of biological populations. The mounting evidence for widespread Allee effects has lately inspired theoretical studies of how Allee effects alter population dynamics.
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Allee effects and extinction debt

Ecological Modelling, 2011
Abstract Habitat destruction may have profound negative impacts on the biodiversity of a given environment. The presence of Allee effects compounds these problems. A sound understanding of the interplay between habitat destruction, Allee effects, and subsequent extinctions is needed to better guide conversation efforts.
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Allee effects introduced by density dependent phenology

Mathematical Biosciences
We consider a hybrid model of an annual species with the timing of a stage transition governed by density dependent phenology. We show that the model can produce a strong Allee effect as well as overcompensation. The density dependent probability distribution that describes how population emergence is spread over time plays an important role in ...
Timothy J. Pervenecki, Sharon Bewick, Garrett Otto, William F. Fagan, Bingtuan Li   +4 more
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Spatial Spread with Allee Effect

2019
Many species exhibit an Allee effect, where population growth rates are highest at intermediate rather than low density, and small populations may even decline. Determining the spread rates of these species turns out to be much more difficult than the theory in the preceding chapter, where there was no Allee effect.
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