BioScience Dictionary

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Found Taxa 6 times.

Displaying results 1 to 10.

1. Adaptive radiation
The development of a variety of species from a single ancestral form; occurs when a new habitat becomes available to a population . Evolutionary pattern of divergence of a great many taxa from a common ancestral species as a result of novel adaptations or a recent mass extinction . Examples: mammals during the Cenozoic Era after the extinction of dinosaurs at the close of the Mesozoic Era flowering plants during the Cretaceous Period diversified because of their reproductive advantages over gymnosperm and non-seed plants that dominated the floras of the world at that time.

2. Diversity index
The relationship of the number of taxa (richness) to the number of individuals per taxon (abundance) for a given community.

3. Karyoevolution
Evolutionary change in the chromosome set , expressed as changes in number and gross structure of the chromosomes; (more broadly), evolutionary relationships between taxa as indicated by karyotype differences.

4. Macroevolution
The combination of events associated with the origin, diversification, extinction , and interactions of organisms which produced the species that currently inhabit the Earth. Large scale evolutionary change such as the evolution of new species (or even higher taxa ) and extinction of species.

5. Numerical taxonomy
The grouping by numerical methods of taxonomic units into taxa based on their character states.

6. Taxon (plural: taxa)
A group or category, at any level, in a system for classifying plants or animals.

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