Concept
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Reproductive Isolation
Temporal isolation
These two related frog species exhibit temporal reproductive isolation. (a) Rana aurora breeds earlier in the year than (b) Rana boylii.
Source
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"OpenStax College, Formation of New Species. October 16, 2013."
http://cnx.org/content/m44574/latest/Figure_18_02_09ab.jpg
OpenStax CNX
CC BY 3.0.