Preserving the information content of species: genetic diversity, phylogeny, and conservation worth

Article Abstract:

Conservation worth can be assessed using several different phylogenetic measures. Species' branch-lengths are a superior measurement method compared to those based on topology, and distances between genome differences are superior to substitution distances. Gene number however may be the most important, as a primary goal of conservation is to preserve a maximum level of the planet's genetic information.

Genetic aspects, Biological diversity conservation, Biodiversity conservation

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Echinoderm larvae and phylogeny

Article Abstract:

The independent evolution of larval morphology from adult morphology in echinoderms can complicate phylogenetic analysis but yield potential predictions for future species development. Larval morphology displays more flexibility and homoplasy than adult morphology. Since larval tissue is resorbed during metamorphosis, it impacts the determination of adult body plan.

Larvae, Echinodermata

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Phylogeny estimation and hypothesis testing using maximum likelihood

Article Abstract:

Phylogenetic hypothesis testing is enhanced through the use of a likelihood framework. Likelihood provides a unified foundation for hypothesis evaluation, and coupled with parametric bootstrapping, can be used in ratio tests for cases in which null distribution determination is problematic. Ratio testing has provided data on DNA substitution patterns and topology.

Research, Methods, Usage, Maximum likelihood estimates (Statistics), Statistical hypothesis testing, Maximum likelihood (Statistics)

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