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BIOL 103 (255)


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BIOL 103
Sidney Eve Matrix

Species are named on the basis of statistically significant differences in the traits used to estimate the phylogeny Recent analyses have found that the phylogenetic species concept often distinguishes a series of cryptic species in populations that were formerly considered a single species Applying Species Concepts Two Case Histories Species can be identified by distinctive morphological traits reproductive isolation andor phylogenetic independence Each species concept has advantages and disadvantagesEmploying more than one species concept can help biologists recognize diversity and organize research on its consequences Read example on Marine Copepods and Elephants on Pages 609610162 Mechanisms of Genetic IsolationSpeciation has been hypothesized to be a threestage process o Initial step that isolates populationso Second step that results in divergence in traits such as mating system or habitat useo Final step that produces reproductive isolation Isolation and divergence steps were thought to take place over time and to occur while populations were located in different geographic areas Final phase was hypothesized to occur when these diverged populations came back into physica
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