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Joined 2026-09-21 Message
Incoming links: Hybrid zone
Deer 2026-11-05
Deer are mammals of the family Cervidae. They include species with bony antlers that are shed and regrown, and their browsing can strongly influence vegetation. Family membership, external appearance and the ancestry of an individual are related but different kinds of information.
A genetic study of red and introduced sika deer in Scotland combined microsatellite markers with mitochondrial DNA. Two broadly distinct genetic groups persisted, yet introgressed alleles were detected where their distributions overlapped. [ref]
Introgression through rare hybridization: A genetic study of a hybrid zone between red and sika deer (genus Cervus) in Argyll, Scotland by Simon J. Goodman and others. 1999, abstract: eleven microsatellite markers, mitochondrial DNA and introgression
Thus recognizable groups can exchange some genes without becoming immediately indistinguishable. Appearance alone need not reveal every episode of ancestry across a hybrid zone. Hybrid zone 2026-11-05
A hybrid zone is a region where genetically differentiated populations meet and produce offspring through interbreeding. Its spatial pattern reflects gene flow, dispersal and possible differences in biological fitness. A narrow transition can persist despite interbreeding; observing hybrids does not by itself show that the parental populations will merge completely.
In a Scottish contact zone between red deer and introduced sika deer, microsatellite genetic markers and the mitochondrial genome revealed introgression within populations that still formed two distinguishable genetic groups. Rare interbreeding can therefore leave a broader inherited signal than inspection of external appearance suggests.[ref]
Introgression through rare hybridization: A genetic study of a hybrid zone between red and sika deer (genus Cervus) in Argyll, Scotland by Simon J. Goodman and others. Genetics 152, pp. 355–371; microsatellite and mitochondrial evidence of introgression
Comparing multiple genetic markers helps distinguish contemporary interbreeding from ancestry accumulated across generations. Secondary contact Created 2026-10-20 Updated 2026-11-05
Secondary contact is renewed geographic contact between biological populations that diverged during an interval of separation. The resulting interaction can involve gene flow, a hybrid zone or continued reproductive isolation.
Present-day sympatry therefore does not alone establish sympatric speciation: the populations may have become distinct elsewhere before meeting again. Historical inference needs evidence about both the earlier separation and the later exchange.
Simon J. Goodman Created 2026-10-20 Updated 2026-11-05
An ecologist who used genetic markers to investigate introgression between red deer and sika deer in a hybrid zone.[ref]
Introgression through rare hybridization: A genetic study of a hybrid zone between red and sika deer (genus Cervus) in Argyll, Scotland by Simon J. Goodman and others. Author roster and experimental or comparative findings