منابع مشابه
Coexistence under positive frequency dependence.
Negative frequency dependence resulting from interspecific interactions is considered a driving force in allowing the coexistence of competitors. While interactions between species and genotypes can also result in positive frequency dependence, positive frequency dependence has usually been credited with hastening the extinction of rare types and is not thought to contribute to coexistence. In ...
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In his opinion piece, Pauw [1] advocated a niche theoretical approach for studying the coexistence of plant species that differ in pollinator use, but are otherwise ecologically equivalent. By treating pollinators as a resource, one can apply the conceptual framework of the Lotka–Volterra model, which shows that coexistence can occur when each species limits its own growth rate more than that o...
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We describe a 49-year-old man with coexistence of ochronosis and B27 positive ankylosing spondylitis. This is the first report documenting the simultaneous occurrence of ochronosis and B27 positive ankylosing spondylitis, with no positive familiar history for seronegative spondylarthropathies. The relations of these rheumatic diseases are discussed.
متن کاملGlobal positive coexistence of a nonlinear elliptic biological interacting model.
The purpose of this note is to give a necessary and sufficient condition for the coexistence of positive solutions to a rather general type of elliptic predator-prey system of the Dirichlet problem on the bounded domain omega when omega is a subset of Rn is large. The result is that the partial differential equation system possesses positive coexistence if and only if the corresponding ordinary...
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Examining the Effectiveness of Positive Thinking Skills Training on High School Girls’ Achievement Motivation in Tehran A. Azimi Khoee Sh. Navabinejad, Ph.D. The present study was undertaken to examine the effectiveness of positive thinking skills training on high school girls’ achievement motivation in Tehran. The study was a quasi-experimental one with pretest/pos...
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ژورنال
عنوان ژورنال: EDUCACIÓN Y HUMANISMO
سال: 2016
ISSN: 0124-2121
DOI: 10.17081/eduhum.18.30.1324