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15 results for “Macrhybopsis”
Under the radar: genetic assessment of Rio Grande Shiner (Notropis jemezanus) and Speckled Chub (Macrhybopsis aestivalis), two Rio Grande basin endemic cyprinids that have experienced recent range contractions
<p>The Rio Grande drainage of the southwestern United States and Mexico has undergone intense anthropogenic alteration by water diversions, extraction and associated habitat changes. These alterations have disproportionately impacted the pelagic broadcast spawning guild of minnows (pelagophils). Several Rio Grande endemic pelagophils, including the co-occurring Rio Grande Shiner (<i>Notropis jemezanus</i>) and Speckled Chub (<i>Macrhybopsis aestivalis</i>), have experienced dramatic recent range-wide declines yet have slipped under the radar of conservation efforts. The status of <i>N. jemezanus </i>and <i>M. aestivalis </i>in the Rio Grande and Pecos River was evaluated and standing genetic variation were characterized. Genetic evidence indicates that populations of both species found in the Rio Grande and Pecos River are genetically distinct. Additionally, 159 outlier loci were identified in <i>M. aestivalis </i>suggesting possible local adaptation in the Rio Grande and Pecos River populations. Though range-wide genetic data are limited, <i>N. jemezanus </i>populations in both rivers harbor considerable genetic diversity. Mitochondrial data from both taxa are consistent with a history of secondary contact between formerly isolated populations with deeply divergent haplotypes found within the Rio Grande and Pecos River populations of <i>N. jemezanus </i>and within the Rio Grande population of <i>M. aestivalis.</i> Extensive survey efforts in the lower Rio Grande and its tributaries in Texas document significant range contraction and near extirpation of <i>N. jemezanus </i>from this part of the basin; highlighting the need for immediate action to protect the species. </p>
Under the radar: genetic assessment of Rio Grande Shiner (Notropis jemezanus) and Speckled Chub (Macrhybopsis aestivalis), two Rio Grande basin endemic cyprinids that have experienced recent range contractions
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FIGURE 6 in Morphological and genetic evolution in eastern populations of the Macrhybopsis aestivalis complex (Cypriniformes: Cyprinidae), with the descriptions of four new species
FIGURE 6. Scatterplot of sPC2 and sPC3 from sheared principal components analysis of 33 standard and truss measurements taken from male (n = 55) Macrhybopsis boschungi and M. tomellerii.
FIGURE 3 in Morphological and genetic evolution in eastern populations of the Macrhybopsis aestivalis complex (Cypriniformes: Cyprinidae), with the descriptions of four new species
FIGURE 3. Scatterplot of sPC2 and sPC3 from sheared principal components analysis of 33 standard and truss measurements taken from female (n = 153) Macrhybopsis boschungi, M. etnieri, M. pallida, M. tomellerii and M. hyostoma from Mississippi River drainage.
FIGURE 5 in Morphological and genetic evolution in eastern populations of the Macrhybopsis aestivalis complex (Cypriniformes: Cyprinidae), with the descriptions of four new species
FIGURE 5. Scatterplot of sPC2 and sPC3 from sheared principal components analysis of 33 standard and truss measurements taken from female (n = 84) Macrhybopsis boschungi and M. tomellerii.
FIGURE 8 in Morphological and genetic evolution in eastern populations of the Macrhybopsis aestivalis complex (Cypriniformes: Cyprinidae), with the descriptions of four new species
FIGURE 8. Tertiary eustatic changes in sea level. Meters above or below present sea level are tentative. From Vail & Hardenbol (1979); reproduced in Gilbert (1987: 37, fig. 5).
FIGURE 2 in Morphological and genetic evolution in eastern populations of the Macrhybopsis aestivalis complex (Cypriniformes: Cyprinidae), with the descriptions of four new species
FIGURE 2. Distribution of southeastern species of Macrhybopsis east of the Mississippi River. Individual species are identified by symbol and color. Circles with half blue and half red represent locations where M. boschungi and M. etnieri occur syntopically.
FIGURE 4 in Morphological and genetic evolution in eastern populations of the Macrhybopsis aestivalis complex (Cypriniformes: Cyprinidae), with the descriptions of four new species
FIGURE 4. Scatterplot of sPC2 and sPC3 from sheared principal components analysis of 33 standard and truss measurements taken from male (n = 93) Macrhybopsis boschungi, M. etnieri, M. pallida, M. tomellerii, and M. hyostoma from Mississippi River drainage.
FIGURE 1 in Morphological and genetic evolution in eastern populations of the Macrhybopsis aestivalis complex (Cypriniformes: Cyprinidae), with the descriptions of four new species
FIGURE 1. Species of Macrhybopsis aestivalis species complex from eastern North America. A) Macrhybopsis hyostoma, UAIC 11060.03, Female, 34 mm SL, Alabama, Limestone County, Elk River, 28 September 1994. B) Macrhybopsis boschungi, UAIC 10845.03, Female, 50 mm SL, Alabama, Dallas County, Cahaba River, 12 July 1993. C) Macrhybopsis etnieri, UAIC 11053.01, Female, 44 mm SL, Alabama, Bibb County, Cahaba River, 24 June 1994. D) Macrhybopsis pallida, UAIC 10855.04, Female, 36 mm SL, Alabama, Escambia County, Conecuh River, 15 July 1993. E) Macrhybopsis tomellerii, UAIC 11364.03, Female, 51 mm SL, Mississippi, Covington County, Pascagoula River drainage, 18 February 1994.
FIGURE 3 in Molecular systematics of the North American chub genus Macrhybopsis (Teleostei: Cyprinidae)
FIGURE 3. Bayesian tree for ND2 in the Platygobio-Macrhybopsis clade and two representatives of the shiner clade (L. umbratilis and H. winchelli). Outgroups excluded. Labels at terminal nodes = haplotype designation; parentheses = locality numbers (Fig. 1). Bold and slightly enlarged locality numbers = M. australis in the Red River clade and M. tetranema in the Northern Plains clade. Asterisks above internal nodes = Bayesian support>0.95; numbers below nodes = maximum parsimony bootstrap support>50%.
FIGURE 2. Bayesian tree for S7 intron 1 in Molecular systematics of the North American chub genus Macrhybopsis (Teleostei: Cyprinidae)
FIGURE 2. Bayesian tree for S7 intron 1 in the Platygobio-Macrhybopsis clade and two representatives of the shiner clade (L. umbratilis and H. winchelli). Outgroups excluded. Labels at terminal nodes = haplotype designation followed by locality numbers in Fig. 1; those beginning with GU or JX are accession numbers for sequences obtained from GenBank. Terminal nodes identified only by river system are Eisenhour's (2004) M. hyostoma. Numbers above internal nodes = Bayesian support ±0.90 (asterisks,>0.95); below nodes = maximum parsimony bootstrap support>50%.
FIGURE 4 in Molecular systematics of the North American chub genus Macrhybopsis (Teleostei: Cyprinidae)
FIGURE 4. Distribution of primary ND2 clades (Fig. 3) in the M. aestivalis complex of species. Clades not designated by genus and species names are from the currently recognized M. hyostoma, except for the Red River clade, which includes both M. australis and M. hyostoma, and the Northern Plains clade, which includes the Arkansas River endemic, M. tetranema with putative M. hyostoma. Question marks signify areas where we failed to collect (Tennessee River) or did not attempt to collect (lower Mississippi River system) specimens although there are historical records of occurrence for representatives (M. cf. hyostoma) of the complex.
FIGURE 1 in Molecular systematics of the North American chub genus Macrhybopsis (Teleostei: Cyprinidae)
FIGURE 1. Sampling localities for Macrhybopsis (see Appendix). Rivers and basins mentioned in the text are as follows: 1 Rio Grande; 2 Pecos; 3 Guadalupe; 4–5 Colorado; 6 Brazos; 7 Angelina; 8 Sabine; 9–16 Red; 17 Pearl; 18 Pascagoula; 19–21 Escambia to Choctawhatchee; 22–23 Mobile Basin below the Fall Line; 24 Tallapoosa; 25–26 Mobile Basin above the fall line; 27 South Canadian; 31 Ninnescah; 27–31 Arkansas; 32 Ouachita; 33 White; 34 Kansas; 35–39 Missouri; 40 Des Moines; 42– 44 Wabash; 45 Licking; 46 South Fork Kentucky; 47 Green.
Still time for action: genetic conservation of imperiled South Canadian River fishes, Arkansas River Shiner (Notropis girardi), Peppered Chub (Macrhybopsis tetranema) and Plains Minnow (Hybognathus placitus)
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FIGURE 7 in Morphological and genetic evolution in eastern populations of the Macrhybopsis aestivalis complex (Cypriniformes: Cyprinidae), with the descriptions of four new species
FIGURE 7. Proposed phylogenetic relationships among various species/lineages recognized in the Macrhybopsis aestivalis complex of eastern North America. Not all species in the complex were evaluated. One study is based on morphological characters (Eisenhour 2004 [A]), whereas the other two studies are based on allozyme variation. Underwood et al. (2003 [B]) focused on western diversity (SB = Sabine, BZ = Brazos, PC = Pecos River, SM = San Marcos River); and Mayden & Powers (2004 [C-G]) mostly involved eastern lineages, excluding Colorado River (CR) and Guadalupe River (GR). In Mayden & Powers (2004) different distances were examined, as well as parsimony: C = Edwards and Cavalli-Sforza Edwards Chord distances; D = Prevosti and Rogers distances; E = Cavalli-Sforza Edwards Arc and Modified Rogers distances; F = Fitch Generalized Parsimony with coded characters.
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