BIOA02H3 Chapter Notes - Chapter 19: Mangrove Rivulus, Species Problem, Ecological Niche
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BIOA02H3 Full Course Notes
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Document Summary
The biological species concept defines a species as a group of organisms that can successfully interbreed and produce fertile offspring. The phylogenetic species concept defines a species as a group of organisms bound by a unique ancestry. The ecological species concept defines a species as a group of organism that share a distinct ecological niche. Bacillus subtilis causes food poisoning while bacillus anthracis causes anthrax. Vibrio fischeri is a symbiont that makes some squid bioluminescence whereas vibrio cholera has an entirely different effenct, one that frequently kills people. Androdioecous organisms exist as natural populations of functional males and hermaphrodites but include no true females (ex: the mangrove rivulus and clam shrimps) Gynogenetic species have only females (poecilia formosa or amazon molly) Hybridization when two species interbreed and produce fertile offspring. Morphological species concept the idea that all individuals of a species share measurable traits that distinguish them from individuals of other species.
