Hybridization in the Darters Etheostoma spectabile and Etheostoma radiosum cyanorum

Branson, Branley A.; Campbell, James B.

doi:10.2307/1441697

Cited by 18 publications

(6 citation statements)

References 4 publications

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“…In (Fisher, 1990;Page, 2000;Fuller, 2003). Interspecific sneaking has been observed in laboratory studies of taxa from the same subgenus, E. radiosum and Etheostoma spectabile pulchellum (Girard) (Mendelson, 2003a), which hybridize extensively in the Blue River, Oklahoma (Distler, 1968;Branson & Campbell, 1969;Echelle et al, 1974). This interspecific sneaking is strongly asymmetric as E. s. pulchellum males and E. radiosum females spawned more frequently than E. radiosum males and E. s. pulchellum females.…”

Section: Discussionmentioning

confidence: 93%

History repeated: recent and historical mitochondrial introgression between the current darter Etheostoma uniporum and rainbow darter Etheostoma caeruleum (Teleostei: Percidae)

Ray¹,

Lang²,

Wood³

et al. 2008

Journal of Fish Biology

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Incongruence between recognized taxonomy and phylogenetic relationships between two species from a diverse clade (Percidae: Etheostomatinae) of stream fishes was found in a mitochondrial (mt) DNA gene tree. Two darters in subgenus Oligocephalus, Etheostoma uniporum current darter and Etheostoma caeruleum rainbow darter were sampled throughout their sympatric distribution in the Ozark Highlands of the central United States. Sequences from cytochrome (cyt) b and the first intron of the nuclear marker S7 were analysed separately using maximum parsimony and Bayesian methods. Cyt b recovered both species as polyphyletic; E. uniporum haplotypes were interspersed within E. caeruleum. However, both species were monophyletic and non-sister taxa based on S7. The cyt b gene tree pattern is caused by introgressive hybridization resulting in the mtDNA replacement of E. uniporum haplotypes by those of E. caeruleum. Some E. uniporum haplotypes are shared with geographically proximate E. caeruleum, and this is consistent with recent hybridization, while other E. uniporum haplotypes indicate historical sorting of introgressed lineages. The mechanism of introgression is likely asymmetric sneaking behaviour by male E. uniporum, a mating tactic observed in related species. MtDNA replacement may have occurred in E. uniporum due to drift fixation in a historically small female effective population. Additional evidence for darter hybridization will likely be discovered in future molecular genetic surveys of the nearly 200 species in eastern North America.

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Section: Discussionmentioning

confidence: 93%

History repeated: recent and historical mitochondrial introgression between the current darter Etheostoma uniporum and rainbow darter Etheostoma caeruleum (Teleostei: Percidae)

Ray¹,

Lang²,

Wood³

et al. 2008

Journal of Fish Biology

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“…We have found only two fish displaying heterozygosity for the four otherwise fully diagnostic loci here (an F, and an F2 backcross). As our sampling across three generations has demonstrated stability of the genetic differences, we do not regard this low level of hybridisation as seriously compromising their species status, particularly as hybridisation is relatively common among freshwater fish species (Hubbs, 1955) and habitat disturbance in the wild can remove reproductive isolation (Hubbs, 1961;Branson & Campbell, 1969). We have also resampled THR and TOT (Table 2) the following year and find only minor frequency differences from the original collections.…”

Section: Systematicsmentioning

confidence: 88%

Isozyme analysis of Galaxias species (Teleostei: Galaxiidae) from the Taieri River, South Island, New Zealand: a species complex revealed

Allibone

Crowl

Holmes

et al. 1996

Biological Journal of the Linnean Society

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We examined genetic differentiation among 23 samples of non-migratory river galaxias from 17 streams in the Taieri River system, South Island, New Zealand. Four major genetic types were found, two of which occur in narrow sympatry in one location. These were compared with topotypical material representing Galaxim anomalus from the Clutha system (Otago) and G. vulgaris from the Waimakariri system (Canterbury) in order to establish identity.Morphological examination of these four major genetic types revealed consistent concomitant differences. The results suggest that there are at least three species of river galaxias in the Taieri system: G. anomalus, G. vulgaris and at least one previously undescribed species. We propose that the genetic structuring and subsequent speciation of this group has been promoted by the absence of the marine juvenile phase that is found in five other members of the genus native to New Zealand. This structuring may be exacerbated by population fragmentation over the last century owing to the negative influence of introduced trout. The phylogenetic diversity within the river system mirrors the diverse flora and invertebrate fauna of the region, and has conservation implications that parallel those resulting from our improved knowledge of the New Zealand herpetofauna through the application of genetic analysis. UJ 1!)0(1 The Linnean Society of london ADDITIONAL

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“…Introgression has resulted in the fixation of heterospecific mitochondrial haplotypes in both the strawberry darter Etheostoma fragi Distler 1968 and in E. uniporum . In the case of E. uniporum , the heterospecific alleles originated from E. caeruleum , though conversely the E. caeruleum clade shows no evidence of introgression from the E. spectabile clade (Ray et al, ; Bossu & Near, ).The recent formation of a hybrid swarm between E. spectabile and the redbelly darter Etheostoma radiosum (Hubbs & Black 1941) sub‐species cyanorum in the Blue River may illustrate the initial process of sympatric interaction and introgression in darters, as the species had previously been largely separated by a dam (Branson & Campbell, ; Echelle et al, ). On the other hand, introgression does not follow inevitably from darter hybridization; hybrids between the logperch Percina caprodes (Rafinesque 1818) and the blackside darter Percina maculata (Girard 1859) are well‐reported (Keck & Near, ), yet there is no evidence of introgression between the two lineages (Near, ; Near & Bernard, ).…”

Section: Discussionmentioning

confidence: 99%

Reproductive isolation between two darter species is enhanced and asymmetric in sympatry

Zhou¹,

Fuller²

2014

Journal of Fish Biology

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Robust reproductive isolation was found between the rainbow darter Etheostoma caeruleum and the orangethroat darter Etheostoma spectabile, as more offspring were produced when conspecific males and females were crossed as compared with heterospecific crosses. Furthermore, fewer eggs resulted from heterospecific crosses involving sympatric E. spectabile females than those using allopatric E. spectabile females, while a similar pattern was not observed in heterospecific crosses using E. caeruleum females. These results suggest that reinforcement, i.e. selection for pre-zygotic reproductive barriers driven by reduced hybrid fitness, may have contributed to the evolution and maintenance of reproductive barriers between these potentially hybridizing species in sympatry.

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Hybridization in the Darters Etheostoma spectabile and Etheostoma radiosum cyanorum

Cited by 18 publications

References 4 publications

History repeated: recent and historical mitochondrial introgression between the current darter Etheostoma uniporum and rainbow darter Etheostoma caeruleum (Teleostei: Percidae)

History repeated: recent and historical mitochondrial introgression between the current darter Etheostoma uniporum and rainbow darter Etheostoma caeruleum (Teleostei: Percidae)

Isozyme analysis of Galaxias species (Teleostei: Galaxiidae) from the Taieri River, South Island, New Zealand: a species complex revealed

Reproductive isolation between two darter species is enhanced and asymmetric in sympatry

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