Results 1 to 10 of about 3,161,795 (320)
Testing the accuracy of biological attributes in predicting extinction risk
Perspectives in Ecology and Conservation, 2020 The assessment of species conservation status traditionally relies on population data. In the absence of such data, biological attributes have been applied to predict the degree of species’ vulnerability. Our study investigated the accuracy of biological
Bruna F. Ceretta +5 more
doaj +4 more sources
Mass Extinctions vs. Uniformitarianism in Biological Evolution [PDF]
, 1996 It is usually believed that Darwin's theory leads to a smooth gradual evolution, so that mass extinctions must be caused by external shocks. However, it has recently been argued that mass extinctions arise from the intrinsic dynamics of Darwinian evolution.
Bak, P., Paczuski, M.
arxiv +8 more sources
Biological Correlates of Extinction Risk in Resident Philippine Avifauna [PDF]
Frontiers in Ecology and Evolution, 2021 The majority of the world’s biodiversity occurs in the tropics, but human actions in these regions have precipitated an extinction crisis due to habitat degradation, overexploitation, and climate change.
Kyle D. Kittelberger +6 more
doaj +4 more sources
Monte Carlo Simulation of Age-Dependent Host-Parasite Relations [PDF]
, 2007 The death of a biological population is an extreme event which we investigate here for a host-parasitoid system. Our simulations using the Penna ageing model show how biological evolution can ``teach'' the parasitoids to avoid extinction by waiting for the right age of the host. We also show the dependence of extinction time on the population size.
Ana Proykova +7 more
arxiv +4 more sources
Extinction events and species lifetimes in a simple ecological model [PDF]
Phys. Rev. Lett.81, 5011 (1998), 1998 A model for large-scale evolution recently introduced by Amaral and Meyer is studied analytically and numerically. Species are located at different trophic levels and become extinct if their prey becomes extinct. It is proved that this model is self-organized critical in the thermodynamic limit, with an exponent 2 characterizing the size distribution ...
Drossel, Barbara
arxiv +3 more sources
Extinction, periodicity and multistability in a Ricker Model of Stage-Structured Populations [PDF]
Journal of Difference Equations and Applications (2016) 22,
519-544, 2015 We study the dynamics of a second-order difference equation that is derived from a planar Ricker model of two-stage (e.g. adult, juvenile) biological populations. We obtain sufficient conditions for global convergence to zero in the non-autonomous case. This gives general conditions for extinction in the biological context.
Lazaryan, N., Sedaghat, H.
arxiv +3 more sources
Clumpy Cold Dark Matter and Biological Extinctions [PDF]
Phys.Lett. B368 (1996) 266-269, 1995 Cosmological models with cosmic string and texture seeded universes predict a present abundance of very dense clumps of Cold Dark Matter particles. Their crossing through the solar system would induce a non-negligible amount of radiation damage to all living tissue; the severity of such an episode is assessed. The estimated frequency of these crossings
J. I. Collar, J. I. Collar
arxiv +4 more sources
Mass Extinction in a Simple Mathematical Biological Model [PDF]
arXiv, 1997 Introducing the effect of extinction into the so-called replicator equations in mathematical biology, we construct a general model of ecosystems. The present model shows mass extinction by its own extinction dynamics when the system initially has a large number of species ( diversity).
Tokita, Kei, Yasutomi, Ayumu
arxiv +3 more sources
Extinction phenomena: A biologic perspective on how and why psychoanalysis works [PDF]
Frontiers in Psychology, 2011 This article presents the view that much of the success of classical psychoanalysis is centrally predicated on its biological potency; focusing not on neuropsychology, but on the biology of conditioning.
Linda A.W. Brakel
doaj +4 more sources
A soluble model of evolution and extinction dynamics in a rugged fitness landscape [PDF]
, 1997 We consider a continuum version of a previously introduced and numerically studied model of macroevolution (PRL 75, 2055, (1995)) in which agents evolve by an optimization process in a rugged fitness landscape and die due to their competitive interactions. We first formulate dynamical equations for the fitness distribution and the survival probability.
David M. Raup +19 more
arxiv +4 more sources