Evaluating Intraspecific Variation and Interspecific Diversity: comparing humans and fish species

Details Evaluating Intraspecific Variation and Interspecific Diversity: comparing humans and fish species Evaluating Intraspecific Variation and Interspecific Diversity: comparing humans and fish species

2008-07-22

arxiv.org/abs/0807.3350v1

Biology

Quantitative Biology

Populations and Evolution

Masters thesis

Scientific paper

Three questions concerning both intraspecific and interspecific subdivision were addressed in this thesis. Meaningful intraspecific divisions were assessed by testing whether or not modern human variation can be subdivided into geographically distinct groups as was shown among two fish species. This was further tested by observing trends in a worldwide distribution of three craniometric traits within Homo sapiens. In terms of investigating molecular interspecific diversity among humans, two experimental exercises were performed. A cladistic exchange experiment tested for the extent of discontinuity and interbreeding between H. sapiens and neanderthal populations. As part of the same question, another experimental exercise tested the amount of molecular variance resulting from simulations which treated neanderthals as being either a local population of modern humans or as a distinct subspecies. Finally, comparisons of hominid populations over time with fish species helped to define what consti-tutes taxonomically relevant differences between morphological populations as expressed among both trait size ranges and through growth patterns that begin during ontogeny. Compared to the subdivision found within selected teleost species, H. sapiens molecular data exhibited little variation and discontinuity between geographical regions.

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