Sighduck
New Member
- Joined
- Feb 9, 2010
- Messages
- 8
- Gender
- Male
- HSC
- 2010
"... a reproductive community of populations (reproductively isolated from others) that occupies a specific niche in nature."
"... the smallest groups that are consistently and persistently distinct and distinguishable by ordinary means."
- A species is the smallest cluster of organisms that possesses at least one diagnostic character. This character may be morphological, biochemical or molecular and must be fixed in reproductively cohesive units. It is important to realize that this reproductive continuity is not used in the same way as in the BSC. Phylogenetic species may be reproductive communities. Reproductively compatible individuals need not have the diagnostic character of a species. In this case, the individuals need not be conspecific.
- A species must be monophyletic and share one or more derived character. There are two meanings to monophyletic (de Queiroz and Donoghue 1988, Nelson 1989). The first defines a monophyletic group as all the descendants of a common ancestor and the ancestor. The second defines a monophyletic group as a group of organisms that are more closely related to each other than to any other organisms. These distinctions are discussed in Baum 1992 and de Queiroz and Donoghue 1990.
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