Biomedical subjects

R Galar

Publications and source records attributed to R Galar.

2 recordsLinked to original sources

PubMed1991

Simulation of local evolutionary dynamics of small populations.

A simple stochastic model assuming continuous traits, normally distributed modifications, selection for fertility and multiplicative fitness was used to simulate phenotypic evolution by "reproducing individuals" in a given fitness landscape. Of particular interest was how small populations cross saddles separating distinct adaptive peaks. The simulated evolution exhibits a strong dualism: at the same level of reproductive errors, sexual reproduction provides significantly better local adaptation and asexual reproduction provides significantly better adaptive dynamics.

Animals↗

PubMed1985

Handicapped individua in evolutionary processes.

Usually, when considering an evolutionary development, the fittest individua and their successful mutations receive most attention. The less fit ones, existing due to selection-mutation equilibria, are regarded, as an inevitable waste. It appears that these handicapped individua play an important role in evolution, as they make escapes from evolutionary traps possible. It is concluded that crucial improvements come from mutations of mutants. The implications seem to account to some extent for the observed speed and mode of evolution. An appropriate stochastic model is introduced, numerical experiments reported and results discussed.

Biological Evolution↗