Results 21 to 30 of about 2,869,951 (334)

Diversity waves in collapse-driven population dynamics [PDF]

, 2015
Populations of species in ecosystems are often constrained by availability of resources within their environment. In effect this means that a growth of one population, needs to be balanced by comparable reduction in populations of others.
Maslov, Sergei, Sneppen, Kim
core   +4 more sources

Potential gains in life expectancy by reducing inequality of lifespans in Denmark: an international comparison and cause-of-death analysis

BMC Public Health, 2018
Background Reducing lifespan inequality is increasingly recognized as a health policy objective. Whereas lifespan inequality declined with rising longevity in most developed countries, Danish life expectancy stagnated between 1975 and 1995 for females ...
José Manuel Aburto, Maarten Wensink, Alyson van Raalte, Rune Lindahl-Jacobsen   +3 more
doaj   +1 more source

Predators reduce extinction risk in noisy metapopulations [PDF]

, 2010
Background Spatial structure across fragmented landscapes can enhance regional population persistence by promoting local “rescue effects.” In small, vulnerable populations, where chance or random events between individuals may have disproportionately ...
Bonsall, Michael B., Bull, James C.
core   +5 more sources

Resource Allocation with Population Dynamics

, 2016
Many analyses of resource-allocation problems employ simplistic models of the population. Using the example of a resource-allocation problem of Marecek et al.
Epperlein, Jonathan, Marecek, Jakub
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Why Do Herbivorous Mites Suppress Plant Defenses?

Frontiers in Plant Science, 2018
Plants have evolved numerous defensive traits that enable them to resist herbivores. In turn, this resistance has selected for herbivores that can cope with defenses by either avoiding, resisting or suppressing them. Several species of herbivorous mites,
C. Joséphine H. Blaazer, Ernesto A. Villacis-Perez, Rachid Chafi, Thomas Van Leeuwen, Thomas Van Leeuwen, Merijn R. Kant, Bernardus C. J. Schimmel   +6 more
doaj   +1 more source

Tetranychus evansi spider mite populations suppress tomato defenses to varying degrees

Ecology and Evolution, 2020
Plant defense suppression is an offensive strategy of herbivores, in which they manipulate plant physiological processes to increase their performance. Paradoxically, defense suppression does not always benefit the defense‐suppressing herbivores, because
Bram Knegt, Tomas T. Meijer, Merijn R. Kant, E. Toby Kiers, Martijn Egas   +4 more
doaj   +1 more source

Competitive Lotka-Volterra Population Dynamics with Jumps [PDF]

, 2011
This paper considers competitive Lotka-Volterra population dynamics with jumps. The contributions of this paper are as follows. (a) We show stochastic differential equation (SDE) with jumps associated with the model has a unique global positive solution;
Applebaum, Chenggui Yuan, Gard, Gard, Geroge Yin, Gopalsamy, Jiang, Jianhai Bao, Kuang, Kunita, Li, Lipster, Liu, Mao, Mao, Mao, Peng, Prato, Roubik, Roughgarden, Takeuchi, Takeuchi, Xiao, Xuerong Mao, Zhu, Zhu, Øksendal   +26 more
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Stochastic gain in population dynamics

, 2004
We introduce an extension of the usual replicator dynamics to adaptive learning rates. We show that a population with a dynamic learning rate can gain an increased average payoff in transient phases and can also exploit external noise, leading the system
A. Cabrales, Arne Traulsen, C. A. Holt, C. T. Bergstrom, C. W. Gardiner, D. Foster, D. Fudenberg, H. Gintis, H. G. Schuster, Heinz Georg Schuster, J. Hofbauer, J. Hofbauer, J. M. Smith, J. v. Neumann, J. W. Weibull, M. A. Nowak, M. A. Nowak, P. Schuster, R. Axelrod, Torsten Röhl, Y. Sato   +20 more
core   +1 more source

Inequalities in lifespan and mortality risk in the US, 2015–2019: a cross-sectional analysis of subpopulations by social determinants of health

BMJ Open
Objective To quantify inequalities in lifespan across multiple social determinants of health, how they act in tandem with one another, and to create a scoring system that can accurately identify subgroups of the population at high risk of mortality ...
Marie-Pier Bergeron-Boucher, Julia Callaway, Cosmo Strozza, Jim Oeppen   +3 more
doaj   +1 more source

Particle Statistics and Population Dynamics

, 2004
We study a master equation system modelling a population dynamics problem in a lattice. The problem is the calculation of the minimum size of a refuge that can protect a population from hostile external conditions, the so called critical patch size ...
Alcaraz, Cardy, Carlos Escudero, Doering, Doi, Escudero, Frensley, Goel, Hernández-García, Ludwig, McClintock, Mobilia, Mobilia, Mobilia, Murray, Oppenheim, Shaffer, Skellam, Sznajd-Weron, Sznajd-Weron   +19 more
core   +2 more sources