Studies into abstract properties of individuals. VI. The degree of emergence in individuals, populations, species and a three species lineage.
Emergent properties derived from the integration among descriptive variables were explored in three related grass species, Achnatherum lemmonii, Achnatherum hendersonii and Achnatherum wallowaensis. Different levels of organization were compared: individuals, populations, species, species-pairs and all three species combined. Emergence was seen at all levels with populations having the lowest degree followed by individuals, species and combinations of species. Because there were no variables unique to any level analyzed, emergence is more than the appearance of new structures. As the degree of emergence increases there is also an increase in variation in integration, the result of new growth rates. Time may explain the different degrees of emergence at the different levels. The trend populations-species-combination of species is easily related to time; the first are younger than the last. An individual develops over a greater period of time than a population. The greater time of existence of a species may account for a greater degree of emergence than an individual. In an individual the local time expressed during ontogeny establishes boundary conditions for an individual. As that local time becomes incorporated into global, or phylogenetic, time, the boundary conditions for taxa and lineages is established.
Maze
J
J
Department of Botany, University of British Columbia, Vancouver, BC, Canada V6T 1Z4. jmaze@interchange.ubc.ca
Banerjee
S
S
Robson
K A
KA
D010802:Phylogeny; D006109:Poaceae / Q000145:classification* / Q000235:genetics; D013045:Species Specificity