Biochemical Genetics of the Colorado River Gila Complex (Pisces: Cyprinidae)

Rosenfeld, Mark J.; Wilkinson, Jeffery A.

doi:10.2307/3671733

Cited by 8 publications

(6 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The two pre-perturbation samples showed no significant within-sample deviations from Hardy-Weinberg expectations (Table 1 ) and no between-sample differences in allele frequencies (Fig,, 2). An earlier genetic survey of Virgin River chubs (Rosenfeld & Wilkinson 1989) provided similar allele frequencies at these loci; therefore, there was no evidence of either spatial or temporal genetic divergence within the river. Post-poison data contrasted sharply with pre-poison results.…”

Section: Resultsmentioning

confidence: 89%

“…The absence of the rarest Pgm-A allele in both hatchery samples provided further evidence of genetic divergence. This allele occurred at a frequency of 3.0% in both the source stock and in the sample from an earlier study (Rosenfeld & Wilkinson 1989). The binomial probability of not detecting an allele at this frequency (0.03) in a sample of SO fish (100 alleles) is small (P = 0.048).…”

Section: Hatchery Samplesmentioning

confidence: 79%

See 1 more Smart Citation

Post‐Perturbation Genetic Changes in Populations of Endangered Virgin River Chubs

DeMarais

Dowling

Minckley

1993

Conservation Biology

View full text Add to dashboard Cite

A 34‐kilometer reach of the Virgin River, Utah‐Arizona‐Nevada, was poisoned with rotenone in an attempt to eradicate non‐native red shiners (Cyprinella lutrensis), a species implicated in the decline of native fish populations in the American West. An error in detoxification resulted in lethal concentrations of piscicide passing through an additional 50 kilometers of stream. We used allozyme electrophoresis to analyze genetic variation among pre‐ and post‐poison samples of endangered Virgin River chubs (Gila seminuda). Pre‐poison samples indicated a single panmictic population in the river. In contrast, fish subsequently produced through natural recruitment in poisoned reaches exhibited deviations from the original pattern of genetic variation. A genetic bottleneck caused by severe reduction in the number of spawning adults was indicated. The altered pattern persisted 2.5 years post‐poisoning, indicating unexpectedly slow recolonization from the unpoisoned reach upstream. Genetic variation among hatchery‐produced young was similarly unrepresentative of the original pattern because of the small number of brood fish used in propagation. Because of their small numbers and/or restricted distribution, endangered species are particularly vulnerable to natural or anthropogenic catastrophes. Assessment of the genetic impact of such events is essential but requires that baseline data are available.

show abstract

Section: Resultsmentioning

confidence: 89%

Section: Hatchery Samplesmentioning

confidence: 79%

Post‐Perturbation Genetic Changes in Populations of Endangered Virgin River Chubs

DeMarais

Dowling

Minckley

1993

Conservation Biology

View full text Add to dashboard Cite

show abstract

“…nigra. Instead, we find evidence that may correspond to environmental condition and geography more than currently accepted taxonomy and given the propensity of the cyprinids for introgression (Briolay et al, 1998;Rosenfeld & Wilkinson, 1989;Demarias et al, 1992;Dowling & Demarias, 1993;Gerber, Tibbets & Dowling, 2001), speciation within the Lower Colorado River Basin seems unlikely. Hybridization in fishes is a common occurrence (Allendorf & Leary, 1988).…”

Section: Management Implicationsmentioning

confidence: 56%

Peer Review #1 of "Geopolitical species revisited: genomic and morphological data indicate that the roundtail chub Gila robusta species complex (Teleostei, Cyprinidae) is a single species (v0.1)"

2018

View full text Add to dashboard Cite

The Gila robusta species complex in the Lower Colorado River Basin has a complicated taxonomic history. Recent authors have separated this group into three nominal taxa, G. robusta, G. intermedia, and G. nigra, however aside from location, no reliable method of distinguishing individuals of these species currently exists. To assess relationships within this group, we examined morphology of type specimens and fresh material, and used RADseq methods to assess phylogenetic relationship among these nominal species. Maximum likelihood and Bayesian inference tree building methods reveal high concordance between tree topologies based on the mitochondrial and nuclear datasets. Coalescent SNAPP analysis resolved a similar tree topology. Neither morphological nor molecular data reveal diagnostic differences between these species as currently defined. As such, G. intermedia and G. nigra should be considered synonyms of the senior G. robusta. We hypothesize that climate driven wet and dry cycles have led to periodic isolation of population subunits and subsequent local divergence followed by reestablished connectivity and mixing. Management plans should therefore focus on retaining genetic variability and viability of geographic populations to preserve adaptability to changing climate conditions.

show abstract

“…Secondary contact and hybridization appear to have played a significant role in the evolution of a variety of North American fishes, as evidenced by both morphological (Miller & Smith, 1981) and biochemical studies (Rosenfeld & Wilkinson, 1989;Demarais et al, 1992;Echelle & Echelle, 1993). The changes occurring after the introduction of C. variegatus into the range of C. pecosensis illustrate that both molecular and morphological change can proceed rapidly over large geographic areas once two previously allopatric species have been brought into contact.…”

Section: Discussionmentioning

confidence: 99%

Morphological variation in intergrade pupfish populations from the Pecos River, Texas, U.S.A.

Wilde

Echelle

1997

Journal of Fish Biology

View full text Add to dashboard Cite

In the early 1980s, sheepshead minnow Cyprinodon variegatus was introduced into the Pecos River, Texas, U.S.A. where it hybridized with the endemic Pecos pupfish C. pecosensis. By 1985, pupfish populations throughout approximately 300 km of the river consisted exclusively of individuals of hybrid origin (intergrades). There was significant (P<0·05) geographic variation in most morphological characters; the general pattern of variation was of a bidirectional cline centred near Pecos, Texas. At that site, morphology of intergrade populations resembled mostly that of the introduced species. Upstream and downstream from Pecos, morphology shifted progressively toward that typical of the native form. Intergrade populations were morphologically intermediate to the parental forms, showed a rapid approach to random assortment of characters, and generally exhibited greater morphological variability than occurred in either parent species. These observations and the consistent lack of bimodality in frequency distributions of a morphological hybrid index support the contention that intergrade populations comprise panmictic admixtures of C. variegatus and C. pecosensis. 1997 The Fisheries Society of the British Isles

show abstract

Biochemical Genetics of the Colorado River Gila Complex (Pisces: Cyprinidae)

Cited by 8 publications

References 17 publications

Post‐Perturbation Genetic Changes in Populations of Endangered Virgin River Chubs

Post‐Perturbation Genetic Changes in Populations of Endangered Virgin River Chubs

Peer Review #1 of "Geopolitical species revisited: genomic and morphological data indicate that the roundtail chub Gila robusta species complex (Teleostei, Cyprinidae) is a single species (v0.1)"

Morphological variation in intergrade pupfish populations from the Pecos River, Texas, U.S.A.

Contact Info

Product

Resources

About