Author:
Bertozzi Terry,Adams Mark,Walker Keith F.
Abstract
Allozyme analyses of carp gudgeons
(Hypseleotris) from five sites in the lower River Murray
revealed three distinctive taxa designated HA,
HB and HC, diagnosable from one
another by fixed differences at 3–5 loci, and three apparent F
1 hybrid forms,
HA¥HB,
HA¥HX and
HB¥HX, where
HX denotes a taxon not sampled in its ‘pure’
form. Of all fish sampled, 25% were hybrids, although only one hybrid
form was found at any one site, and never in company with both parental taxa.
No hybrids involving HC were found, although this was
the most common taxon, and no
HA¥HB hybrids were present at
the one site of demonstrated sympatry between the parental taxa. Morphological
analysis and the lack of introgression confirm that
HA, HB, and
HC are distinct biological species. Partial meristic
data suggest that HC corresponds to
H. klunzingeri s.l., ‘Midgley’s carp
gudgeon’ is a composite of HA,
HB and
HA¥HB hybrids, and
‘Lake’s carp gudgeon’ may be a composite of
HX and one of its hybrids
(HB¥HX). We speculate that one
or more of the hybrid classes may be ‘unisexual lineages’
(clonally reproducing, usually all-female forms derived from hybridization
between congeners).
Subject
Ecology,Aquatic Science,Ecology, Evolution, Behavior and Systematics,Oceanography
Cited by
63 articles.
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