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85 results for “Etheostoma”
Data from: A new species of spottail darter endemic to the Clarks River in Kentucky and Tennessee (Percidae: Etheostomatinae: Etheostoma)
<p><em>Etheostoma xanthovum</em>, the Clarks Darter, is described as a new species endemic to the Clarks River in Kentucky and Tennessee, USA. <em>Etheostoma xanthovum</em> was previously delimited as <em>Etheostoma oophylax</em>, the Guardian Darter, based on morphological trait data. Subsequent to the description of <em>E. oophylax</em>, molecular phylogenetic analyses consistently resolved specimens from the Clarks River system and <em>E. chienense</em>, the Relict Darter, as sister species, which together formed a sister clade to all other sampled populations of <em>E. oophylax</em>. Our analyses of morphological traits, mitochondrial DNA (mtDNA), and genomic sampling using double digest restriction-site associated DNA (ddRAD) sequencing support the distinctiveness of <em>Etheostoma xanthovum</em>. Morphologically, <em>Etheostoma xanthovum</em>, differs from <em>Etheostoma oophylax</em> in the number of dorsal fin rays (12 versus 11), anal fin rays (8 versus 7), and in the number of scale rows around the caudal peduncle (21.8 versus 20.37). <em>Etheostoma xanthovum</em> does not share mtDNA haplotypes with <em>Etheostoma oophylax</em> or <em>Etheostoma chienense</em>. Phylogenomic analysis of an average of 28,448 ddRAD loci per sampled specimen resolves <em>Etheostoma xanthovum</em> and <em>Etheostoma chienense</em> as sister species, and assessment of genomic divergence supports the hypothesis that each of these two species represents a distinct and independently evolving lineage. In addition, we report a range extension of <em>Etheostoma oophylax</em> in the Obion River system, a direct tributary of the Mississippi River. </p>
FIGURE 8 in Incipient speciation in allopatric Etheostoma rupestre (Percidae: Etheostomatinae) lineages, with the description of three new subspecies
FIGURE 8. Male pigmentation of A) Etheostoma rupestre rupestre—47 mm SL, Cottondale Creek, County Road 32, Tuscaloosa, Alabama (photo by K. Boone), B) E. r. piersoni—61 mm SL, Chilatchee Creek, Highway 5, 1 mile north of Alberta, Alabama (photo by K. Boone), and C) E. r. uphapeense—45 mm SL, Opintlocco Creek, County Highway 20, ~3 miles East of Tuskegee, Alabama (Photo by B. Hilburn).
FIGURE 6 in Incipient speciation in allopatric Etheostoma rupestre (Percidae: Etheostomatinae) lineages, with the description of three new subspecies
FIGURE 6. Biplot of first and second principal components from Procrustes coordinates generated from geometric morphometric analysis of Etheostoma rupestre subspecies (n = 45; PC1 = 24.5% variance explained, PC2 = 18.7% variance explained).
FIGURE 3 in Incipient speciation in allopatric Etheostoma rupestre (Percidae: Etheostomatinae) lineages, with the description of three new subspecies
FIGURE 3. Locations of landmarks used in geometric morphometric analysis on specimens of Etheostoma rupestre (1: nare, 2: nape, 3: first dorsal-fin origin, 4: 9th dorsal spine insertion, 5: second dorsal-fin origin, 6: 7th dorsal ray insertion, 7: posterior insertion of dorsal fin, 8: caudal fin insertion on dorsum, 9: center edge of hypural plate, 10: caudal fin insertion on ventrum, 11: posterior insertion of anal fin, 12: 5th anal fin element, 13: anal fin origin, 14: pelvic fin origin, 15: tip of lower jaw, 16: tip of upper jaw, 17: posterior edge of maxilla, 18: lower pectoral fin insertion, 19: upper pectoral fin insertion.
FIGURE 4 in Incipient speciation in allopatric Etheostoma rupestre (Percidae: Etheostomatinae) lineages, with the description of three new subspecies
FIGURE 4. First and second principal components for meristic data for the three subspecies of Etheostoma rupestre. Variable loadings for each principle component are as follows: PC1—lateral line scales: -0.43, scales above lateral line: -0.47, scales below lateral line: -0.47, caudal peduncle scales: -0.44, dorsal spines: -0.21, dorsal rays: -0.05, nape squamation: 0.21, belly squamation: 0.30; PC2—lateral line scales: 0.12, scales above the lateral line: 0.20, scales below the lateral line: 0.14, caudal peduncle scales: 0.14, dorsal spines: 0.21, dorsal rays: 0.19, nape squamation: 0.71, belly squamation: 0.58.
FIGURE 2 in Incipient speciation in allopatric Etheostoma rupestre (Percidae: Etheostomatinae) lineages, with the description of three new subspecies
FIGURE 2. Locations of museum material examined that possessed lat/long coordinates. Dark grey background shading indicates the boundaries of the Mobile Basin and colored shading indicates geographic ranges of each subspecies within the Mobile Basin to which Etheostoma rupestre is endemic. Populations delimited as E. r. rupestre in the current study but for which some taxonomic uncertainty remains are also indicated.
FIGURE 1. Cytochrome-b in Incipient speciation in allopatric Etheostoma rupestre (Percidae: Etheostomatinae) lineages, with the description of three new subspecies
FIGURE 1. Cytochrome-b phylogeny (modified from Janosik et al. [2023] with permission from Springer Nature Publishing Company; subject to associated copyright policy) displaying the three allopatric lineages of Etheostoma rupestre. Bayesian posterior probabilities are displayed on the nodes. EU296687.1 is a GenBank individual from Piller et al. (2008). Individuals that did not sort into the three major clades may indicate incomplete lineage sorting or recent gene exchange between lineages.
The geographic distribution of the imperiled Barrens Darter, Etheostoma forbesi, and threats of hybridization with the closely related Fringed Darter, Etheostoma crossopterum.
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Data from: Systematics and taxonomy of the Snubnose Darter, Etheostoma simoterum (Cope)
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Data from: Explicit tests of paleodrainage connections of southeastern North America and the historical biogeography of Orangethroat Darters (Percidae: Etheostoma: Ceasia)
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Data from: A new species of spottail darter endemic to the Clarks River in Kentucky and Tennessee (Percidae: Etheostomatinae: Etheostoma)
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Conservation genetic assessment of the paleback darter (Etheostoma pallididorsum), a narrowly distributed endemic in the Ouachita Highlands, Arkansas, USA
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Data from: Intrasexual competition underlies sexual selection on male breeding coloration in the orangethroat darter, Etheostoma spectabile
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Data from: Cryptic speciation reversal in the Etheostoma zonale (Teleostei: Percidae) species group, with an examination of the effect of recombination and introgression on species tree inference
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Data from: Phylogenetic and morphological diversity of the Etheostoma zonistium species complex with the description of a new species endemic to the Cumberland Plateau of Alabama
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FIGURE 2 in Systematics of the Etheostoma cinereum (Teleostei: Percidae) species complex (subgenus Allohistium)
FIGURE 2. Landmarks used for morphometric evaluation of Etheostoma cinereum species complex.
Comparative riverscape genomics of the rainbow darter (Etheostoma caeruleum) in glaciated and unglaciated environments
<p>Periodic glaciation during the Quaternary period shaped the contemporary riverscape and distribution of freshwater fishes in the Mississippi River drainage of central North America. The rainbow darter (Etheostoma caeruleum) is a member of this ichthyofauna and has a disjunct distribution in glaciated and unglaciated environments west of the Mississippi River. Based on glacial history of the region there are different expectations on the observed spatial genetic structure of populations in these environments. The aim of this study was to utilize genome-wide SNP data to compare the population genomic structure of the rainbow darter in river networks with disparate glacial histories; the Volga River in the glaciated upper Mississippi River basin and the Meramec River in the unglaciated Ozark Plateau. Individuals were sampled from localities within each river system at distances dictated by the organismal life history and habitat preferences. Riverscape analyses were performed on three datasets: total combined localities of both rivers and one for each river independently. The results revealed a lasting influence of historic glaciation on the population genomic structure of rainbow darter populations. There was evidence of population expansion into the glaciated northern region following glacial retreat. The population genetic signature within the Volga River did not fit expectations of the stream hierarchy model, but revealed a pattern of repeated colonization and extirpation due to cyclic glaciation. The population within the unglaciated Meramec River adhered to the stream hierarchy model, with a directional order of genetic diversity based on the life history and habitat preferences of the species. These results demonstrate the importance of considering the geologic and climatic history of a region as well as the life history of an organism when interpreting spatial genetic patterns.</p>
Comparative riverscape genomics of the rainbow darter (Etheostoma caeruleum) in glaciated and unglaciated environments
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FIG. 2 in Redescription and Recognition of Etheostoma cyanorum from Blue River, Oklahoma
FIG. 2. Holotype of Etheostoma cyanorum, as P. radiosus cyanorum (Moore and Rigney, 1952). Photograph courtesy of the Fish Division, University of Michigan Museum of Zoology.
FIGURE 5 in Three new darter species of the Etheostoma percnurum species complex (Percidae, subgenus Catonotus) from the Tennessee and Cumberland river drainages
FIGURE 5. Photographs of a live (A) male and (B) female E. lemniscatum, Big South Fork Cumberland River, showing typical color and pigmentation of females and non-nuptial males. Photographs by M. R. Thomas, 2008.
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