Species_concepts

Species_concepts - species can also reproduce asexually...

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Species Concepts Typographical Species Concept - pre-Darnwinian, discarded idea A species is defined by fixed, essential features (usually morphological) and is a distinct and immutable entity. Biological Species Concept - Ernst Mayr and Theodsius Dobzhansky, 1983 “A species is a reproductive community of populations (reproductively isolated from others) that occupies a specific niche in nature.” drawbacks: - species have dimensions in space and time; hard to locate distinct boundaries between species - species is a unit of evolution and a taxonomic category
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Unformatted text preview: - species can also reproduce asexually Evolutionary Species Concept - George G. Simpson, 1940’s A species is “a single lineage of ancestor descendent populations that maintains its identity from other such lineages and that has its own evolutionary tendencies and historical fate.” Phylogenetic Species Concept A species is “an irreducible (basal) grouping of organisms diagnosably distinct from other such groupings and within which there is a parental pattern of ancestry and descent.”...
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This note was uploaded on 04/07/2008 for the course BIO 103 taught by Professor Potts-santone during the Spring '07 term at Northeastern.

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