Biomedical subjects

Blaine J Cole

Publications and source records attributed to Blaine J Cole.

3 recordsLinked to original sources

PubMed2004

Polyandry and fitness in the western harvester ant, Pogonomyrmex occidentalis.

Using four highly polymorphic microsatellite markers (12-28 alleles), we gentoyped workers from 63 colonies of Pogonomyrmex occidentalis. Colonies have a single, multiply mated queen, and an average number of 6.3 patrilines per colony. Colony growth was measured over an 8-year period in the study population. Intracolonial relatedness and colony growth are correlated negatively, indicating a substantial fitness benefit to multiple mating.

Animals↗

PubMed2003

Queen size mediates queen survival and colony fitness in harvester ants.

We examined the effect of queen size on the probability of new colony establishment in the ant Pogonomyrmex occidentalis. Large queens are significantly more likely to survive than small queens through the initial stages of colony founding. These differences in individual fitness correlates have corresponding effects on colony fitness. In species in which individual queens vary in fitness, sexual allocation ratios should incorporate the individual fitness functions.

Animals↗

PubMed2002

Evolution of self-organized systems.

In this paper I ask questions about the evolution of self-organized activity cycles that are found in some ant colonies. I use a computer model that generates periodic activity patterns in interacting subunits and explore the parameters of this model using a genetic algorithm in which selecting on one aspect of the system produces the distinctive self-organized pattern. The general point that I explore, using the example of activity cycles, is that the observation of a self-organized pattern does not mean that the pattern is an adaptation. Self-organized patterns can represent nonadaptive correlated responses to selection, exaptations or even selectively disadvantageous traits. Evolution of self-organized patterns requires genetic feedback between the self-organized output and the subunits that produce the pattern. Without this necessary feedback, a self-organized system does not evolve.

Algorithms↗