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Science 13 September 1996:
Vol. 273. no. 5281, pp. 1501 - 0
DOI: 10.1126/science.273.5281.1501
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Special News Report

Ann Gibbons

The species concept is all over biology, from genetics to ecology to evolution. Yet biologists have not been able to agree on what a species is, exactly. The textbook definition is a group that can't interbreed with other groups, yet many accepted species are biologically able to interbreed--they just don't in nature. So researchers are reaching for other definitions, under rubrics such as "genotypic cluster definition," "ecological species," "evolutionary species," and--an attempt at synthesizing the definitions--the "cohesion species concept."




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Science. ISSN 0036-8075 (print), 1095-9203 (online)