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FIGURE 2 in Taxonomic status of the Guadalupe Darter, Percina apristis (Teleostei: Percidae)

FIGURE 2. Percina apristis (live, unanesthetized), 86.5mm SL male; San Marcos River, near town of San Marcos, Texas, 23 March 2003. UF 128463.

FIGURE 1 in Taxonomic status of the Guadalupe Darter, Percina apristis (Teleostei: Percidae)

FIGURE 1. Ranges of Percina sciera (red) and Percina apristis (yellow) with western Gulf Slope drainages labeled.

FIGURE 3 in Taxonomic status of the Guadalupe Darter, Percina apristis (Teleostei: Percidae)

FIGURE 3. Percina apristis, male (with female), in San Marcos River, near town of San Marcos, Texas, 23 March 2003.

FIGURE 2 in Three new percid fishes (Percidae: Percina) from the Mobile Basin drainage of Alabama, Georgia, and Tennessee

FIGURE 2. Three new species of Percina from the Mobile Basin of Alabama, Georgia and Tennessee. Percina kusha (2a) male 60 mm, paratype UF 165704, Conasauga River at County Route 392 bridge, 9.2 km NE of Cisco, Coosa River system, Murray County, Georgia, 28 April 1994; P. s ip si (2b) male 48 mm, UAIC 10274.02, Sipsey Fork River at Forest Service Road 234, 8.8 km NNE of Double Springs, Black Warrior River system, Winston County, Alabama, 2 March 1992; and P. s m i t h v a n i z i (2c) male 58 mm, UAIC 10661.05, Rocky Branch, along US Hwy 78, 2.4 km W of Heflin, Tallapoosa River system, Cleburne County, Alabama, 4 April 1993.

FIGURE 7 in Three new percid fishes (Percidae: Percina) from the Mobile Basin drainage of Alabama, Georgia, and Tennessee

FIGURE 7. Phylogram from Bayesian analysis. Outgroup taxa not shown for clarity. Posterior probability (when above 95%) is indicated above that node.

FIGURE 6 in Three new percid fishes (Percidae: Percina) from the Mobile Basin drainage of Alabama, Georgia, and Tennessee

FIGURE 6. Relationship of log-transformed body depth and standard length of three new Percina species from the Mobile Basin. Regression lines: solid, P. smithvanizi; dashed, P. kusha; dotted, P. sipsi.

FIGURE 3 in Three new percid fishes (Percidae: Percina) from the Mobile Basin drainage of Alabama, Georgia, and Tennessee

FIGURE 3. Distribution of three new species of Percina from the Mobile Basin of Alabama, Georgia and Tennessee. Percina kusha (triangles), P. si ps i (stars) and P. smithvanizi (circles). Upland physiographic provinces are outlined and identified by two letter abbreviations: HR = Highland Rim; CP = Cumberland Plateau; VR = Valley and Ridge; and P = Piedmont.

FIGURE 1 in Three new percid fishes (Percidae: Percina) from the Mobile Basin drainage of Alabama, Georgia, and Tennessee

FIGURE 1. Landmark points used in reconstructing a geometric truss for morphometric shape analysis of three new Percina species from the Mobile Basin.

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FIGURE 3 in Crystallaria cincotta, a new species of darter (Teleostei: Percidae) from the Elk River of the Ohio River drainage, West Virginia

FIGURE 3. Sheared PC2 by sheared PC3 scatter plot of Crystallaria asprella from the Gulf Slope (open squares), lower Mississippi River (open triangles), middle Mississippi River (open diamonds), upper Mississippi River (open circles), and Wabash River (plus signs), and Crystallaria cincotta from the Cumberland River (solid triangle), Elk River (solid diamonds), Green River (solid circle), and Muskingum River (solid square).

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FIGURE 2 in Etheostoma erythrozonum, a new species of darter (Teleostei: Percidae) from the Meramec River drainage, Missouri

FIGURE 2. Distribution of Etheostoma erythrozonum (vertical lines) and E. tetrazonum (horizontal lines) in Missouri. The type locality of E. erythrozonum is identified with a star.

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FIGURE 1 in Etheostoma erythrozonum, a new species of darter (Teleostei: Percidae) from the Meramec River drainage, Missouri

FIGURE 1. Etheostoma erythrozonum (A) male 67 mm SL, holotype USNM 391646 and (B) female 64 mm SL, paratype USNM 391647. Huzzah Creek at the Reis Biological Station, 6.2 km upstream from the Route 8 bridge, Crawford County, Missouri, 3 April 2003.

FIG. 5 in Contemporary and Historical Species Relationships Reveal Assembly Mechanism Intricacies among Co-occurring Darters (Percidae: Etheostomatinae)

FIG. 5. Body shape relationships among darter species (PC1 vs. PC2) based on 12 homologous landmarks used in geometric morphometric analyses. The molecular phylogeny is overlaid to illustrate phylogenetic–morphological relationships among species. Gray wireframe warped grids show body shape extremes along PC1 (48.25% of variation) and PC2 (18.85% of variation). All warped grids are magnified 2.5 times in order to better illustrate changes in variation across each axis. Darter line drawings depict E. blennioides (lower left in morphospace) and N. rufilineatus (upper right in morphospace), and each shows the locations of the 12 homologous landmarks included. Phylogenetic niche conservatism of PC1 (determined by Blomberg's K value) can be visualized in the figure.

FIG. 2 in Contemporary and Historical Species Relationships Reveal Assembly Mechanism Intricacies among Co-occurring Darters (Percidae: Etheostomatinae)

FIG. 2. Map of Duck River drainage showing the 15 study sites. Inserted panel depicts an overview of the location of the Duck River drainage in Tennessee, USA.

FIG. 4 in Contemporary and Historical Species Relationships Reveal Assembly Mechanism Intricacies among Co-occurring Darters (Percidae: Etheostomatinae)

FIG. 4. Ultrametric tree including all darter species known to occur in the Duck River drainage (regional species pool). Species present at each site are illustrated as circles, and abundances are represented by size of circles (i.e., circle sizes are sqrt transformed abundances). For reference, the greatest abundance of a species collected from a single site during the study was E. zonale (site nine; n ¼ 43). Different circle shades represent the different species. Sites one through 15 are depicted from upstream to downstream (left to right). Encircled nodes indicate the two main clades in which species were phylogenetically clustered. See Data Accessibility for tree file.

FIG. 3 in Contemporary and Historical Species Relationships Reveal Assembly Mechanism Intricacies among Co-occurring Darters (Percidae: Etheostomatinae)

FIG. 3. Scatterplots depicting relationships between assemblages and degree of clustering or evenness based on the Net Relatedness Index (NRI) and Nearest Taxon Index (NTI) standard effect size metrics (SESmetrics). Positive values indicate phylogenetic clustering and negative values indicate phylogenetic evenness. NRI values are black circles and NTI values are open triangles (*indicate significant phylogenetic structure in assemblages [P 0.05]). (A) Depicts analyses based on species presence/absence within each assemblage, and (B) depicts analyses including weighted abundances, and therefore indicates relationships among individuals within assemblages.

FIG. 1 in Contemporary and Historical Species Relationships Reveal Assembly Mechanism Intricacies among Co-occurring Darters (Percidae: Etheostomatinae)

FIG. 1. Schematic diagram depicting influences of habitat filtering and/or competitive exclusion and the hypothetical data patterns generated by these two mechanisms across three assembly scenarios. Interpretation of data patterns for each scenario is influenced by the presence of niche conservatism (i.e., whether closely related species have retained ecologically important ancestral traits) or by the presence of convergence in habitat use among co-occurring species. Regional species pool phylogenies and the predicted scenario outcomes are encompassed by boxes (A, B, and C). Darter morphology is shown primarily by the darter silhouettes on the tree tips, and secondarily by darter color shade. Therefore, darter morphology is depicted as conserved in all three scenarios. Habitat use for each ''species'' is indicated by the size of the boxes located above each darter depiction in each scenario (e.g., darters with similar sized boxes have similar habitat use). Hypothetical assemblages containing four species each are depicted below each regional species phylogeny, and active assembly mechanisms related to each assemblage outcome (habitat filtering or competitive exclusion) are indicated to the left. Associated phylogenetic (phylo) and habitat use (habitat) patterns are indicated by the terms ''clustering'' or ''evenness'' within each possible outcome.

Figure 3 in Characterisation of the complete mitochondrial genome of the imperiled Pearl darter Percina aurora (Perciformes: Percidae)

Figure 3. Selective pressure analysis in the protein coding genes of Percina aurora. Top: KA value for each protein-coding gene. Middle: KS value for each protein-coding gene. Bottom: KA/KS ratio for each protein-coding gene.

Figure 1 in Characterisation of the complete mitochondrial genome of the imperiled Pearl darter Percina aurora (Perciformes: Percidae)

Figure 1. Circular representation of Percina aurora mitochondrial genome. Photo credit: United States Fish and Wildlife Service (used with permission).

Figure 5 in Characterisation of the complete mitochondrial genome of the imperiled Pearl darter Percina aurora (Perciformes: Percidae)

Figure 5. Features present in the Control Region (CR) (987 bp) of the Percina aurora mitogenome. The CR is separated into an extended termination-associated sequence domain (ETAS), a core domain, and a conserved sequence block (CSB) domain. The underlined portion denotes the long tandem repeat sequence within the ETAS domain. The blue-green highlighted sequence represents the ETAS 1 region while the blue highlighted sequence represents the ETAS 2 region. Nucleotides in green, yellow and pink correspond to the F-box, E-box and D-box regions within the central domain, respectively. Nucleotides in cyan, red and dark green correspond to the CSB-1, CSB-2 and CSB-3 regions, respectively.

Figure 4 in Characterisation of the complete mitochondrial genome of the imperiled Pearl darter Percina aurora (Perciformes: Percidae)

Figure 4. Visualisation of the tRNA secondary structure in the mitochondrial genome of Percina aurora.