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18 results for “Centrarchidae”
Limited hybridization and introgression despite stocking among endemic Interior Highlands black basses (Centrarchidae: Micropterus)
<p><strong>Aim</strong></p> <p>Smallmouth Bass (<em>Micropterus</em> <em>dolomieu</em>; SMB) are globally popular among anglers and have been widely introduced (i.e., stocked) for population management and sportfishing. Importantly, stocking was prevalent before cryptic diversity within the SMB complex was known, which now includes three newly elevated species: Neosho Bass (<em>M</em>. <em>velox</em>; NB), Little River Bass (<em>M</em>. sp. cf. <em>dolomieu</em> Little River; LRB), and Ouachita Bass (<em>M</em>. sp. cf. <em>dolomieu</em> Ouachita River; OB). We sought to quantify population structure and hybridization and introgression in these three recently described species.</p> <p><strong>Location</strong></p> <p>Species-level diversity, particularly in the basin-restricted LRB and OB in the Ouachita Mountains within the Central Interior Highlands (CIH), North America, suggests the presence of distinct genetic variation that could be eroded by introgression. </p> <p><strong>Methods</strong></p> <p>We estimated interspecific introgression and intraspecific population differentiation in the Smallmouth Bass species complex (SMB-C) using 472 specimens comprising SMB, NB, LRB, and OB, including the naturally sympatric Spotted Bass (<em>M</em>. <em>punctulatus</em>; SPB). Genomic samples were genotyped on a SNP panel of 192 loci designed to detect allele-sharing on multiple hierarchical levels. </p> <p><strong>Results</strong></p> <p>We found low range-wide hybridization between species in the SMB-C and SPB (mostly SMB-C backcrosses), and interspecific heterozygosity varied, indicating differential introgression. Range-wide hybridization between species in the CIH and SMB was similar overall (but mostly F<sub>2</sub> and CIH backcrosses) and was observed in streams with known SMB stocking in connected reservoirs. Interspecific heterozygosity in SMB hybrids was also generally lower, indicating later-generation backcrosses. We found strong population structure in the Ouachita Mountains (LRB and OB). </p> <p><strong>Main Conclusions</strong></p> <p>Despite isolated incidences of natural (SPB) and human-mediated (SMB) introgression, genomic identity appears intact in endemic LRB and OB, suggesting potential ecological or behavioral isolating mechanisms preventing cross-species reproduction. Our findings reveal that genetic variation remains in cryptic, basin-restricted species in the Ouachita Mountains ecoregion that may be managed for long-term conservation.</p>
Limited hybridization and introgression despite stocking among endemic Interior Highlands black basses (Centrarchidae: Micropterus)
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FIGURE 2 in The Alabama Bass, Micropterus henshalli (Teleostei: Centrarchidae), from the Mobile River basin
FIGURE 2. Distribution of Alabama bass, Micropterus henshalli, and spotted bass, Micropterus punctulatus, in Mobile Bay and adjacent drainages based on specimens examined.
FIGURE 1. Micropertus henshalli, 24.4 in The Alabama Bass, Micropterus henshalli (Teleostei: Centrarchidae), from the Mobile River basin
FIGURE 1. Micropertus henshalli, 24.4 cm SL, Tallapoosa River, Tallapoosa Co., Alabama (above); Micropterus punctulatus, 18.5 cm SL, Osanippa Creek, Chattahoochee River, Chambers Co., Alabama.
FIGURE 6 in Diversity within the Redeye Bass, Micropterus coosae (Perciformes: Centrarchidae) species group, with descriptions of four new species
FIGURE 6. Bayesian phylogeny of the M. coosae species group based on the partial mitochondrial ND2 gene. Numbers above nodes are posterior probabilities. Numbers following posterior probabilities or below nodes are bootstrap values resulting from the Maximum Parsimony analysis. Symbols correspond to those in Figure 5. Letters after species names correspond to individual identifiers used in Table 1.
FIGURE 2 in Diversity within the Redeye Bass, Micropterus coosae (Perciformes: Centrarchidae) species group, with descriptions of four new species
FIGURE 2. Pigmentation and pattern of M. coosae (A–C) and M. cahabae (D–F). Micropterus coosae: (A) male (185 mm SL), 7 April 2010; (B) female, (235 mm SL), 16 June 2010; (C) female (76 mm SL), 22 June 2010. Micropterus cahabae: (D) male (195 mm SL), 7 April 2010; (E), female, (142 mm SL), 16 June 2010; (F) male (134 mm SL), 22 June 2010.
FIGURE 1 in Diversity within the Redeye Bass, Micropterus coosae (Perciformes: Centrarchidae) species group, with descriptions of four new species
FIGURE 1. Typical pigmentation and pattern of members of the M. coosae species group: M. coosae (Coosa River), 198 mm SL, Cheaha Creek, Hwy 93, 9.6 km N Talladega, Talladega Co., AL; Micropterus cahabae (Cahaba River), 195 mm SL, Shoal Creek, Hwy 119, Shelby Co., AL; M. chattahoochae (Chattahoochee River), 158 mm SL, Centralhatchee Creek, 1.6 km W Centralhatchee, Heard Co., GA; M. tallapoosae (Tallapoosa River), 155 mm SL, Emuckfaw Creek, 4.8 km N Hwy 22, Tallapoosa Co., AL; M. warriorensis (Black Warrior River), 194 mm SL, Calvert Prong, Black Warrior River, 4.0 km N Oneonta, Blount Co., AL; M. cf. coosae (Savannah River), 164 mm SL, Hudson River, jct. Hwy 29 and Hwy 8, Madison Co., GA, 24 May 2009.
FIGURE 3 in Diversity within the Redeye Bass, Micropterus coosae (Perciformes: Centrarchidae) species group, with descriptions of four new species
FIGURE 3. Pigmentation and pattern of M. tallapoosae (A–C) and M. chattahoochae (D–F). Micropterus tallapoosae: (A) male (138 mm SL), 2 November 2009; (B) female (155 mm SL), 2 November 2009; (C) juvenile (108 mm SL), 28 June 2010. Micropterus chattahoochae: (D) male (179 mm SL), 27 April 2010; (E) female, (158 mm SL), 15 June 2010; (F) male (101 mm SL), 20 June 2010.
FIGURE 4 in Diversity within the Redeye Bass, Micropterus coosae (Perciformes: Centrarchidae) species group, with descriptions of four new species
FIGURE 4. Typical pigmentation and pattern of M. warriorensis (A–C) and a M. henshalli x M. warriorensis hybrid (D) based on pigmentation and meristic characters. Micropterus warriorensis: (A) male (158 mm SL), 3 November 2009; (B) female, (194 mm SL), 3 November 2009; (C) female (146 mm SL), 23 June 2010.
FIGURE 5 in Diversity within the Redeye Bass, Micropterus coosae (Perciformes: Centrarchidae) species group, with descriptions of four new species
FIGURE 5. Distribution of the M. coosae species group in the Mobile Bay and adjacent drainages based on specimens examined. Stars, M. warriorensis; triangles, M. cahabae; circles, M. coosae; squares, M. tallapoosae; plus symbols, M. chattahoochae. Symbols correspond to those in Figure 6.
Figure 5 in A New Species Of Bothriocephalus (Cestoda: Bothriocephalidae) From Lepomis Spp. (Actinopterygii: Centrarchidae) In North America
Figure 5. Scoleces of museum specimens of Bothriocephalus: (A) From L. macrochirus (introduced, Mexico, exact location unknown), (B) HWML 19744, from L. cyanellus, Nebraska, (C) HWML 19929, from L. cyanellus, Nebraska, (D) HWML 30499, from L. cyanellus, Oklahoma, (E) HWML 30500 from L. megalotis, Oklahoma, (F) USNPC 63277, from L. cyanellus, Ohio, (G) USNPC 96634 from L. gibbosus, Wisconsin. (H–J) Whole mounted specimens, (H) HWML 30499 (see D), (I) HWML 19929 (scolex in C), (J) HWML 30500 (scolex in E). Color version available online.
Figure 4. Bothriocephalus kupermani n in A New Species Of Bothriocephalus (Cestoda: Bothriocephalidae) From Lepomis Spp. (Actinopterygii: Centrarchidae) In North America
Figure 4. Bothriocephalus kupermani n. sp. from Lepomis gibbosus. SEM images of the scolex (A–E) and strobila (F, G). (A) Scolex, dorsolateral view (arrow indicating region of bothrial groove). (B) Scolex, lateral view. (C) Scolex, apical view (arrow indicating a central patch of more prominent microtriches). (D) Region of the bothrial groove (arrow in A) showing capilliform filitriches, coniform spinitriches and a tumulus (arrow). (E) Central area of the apical disc (arrow in C) showing capilliform filitriches and tumuli (arrow). (F) Anterior third of the strobila showing gently craspedote proglottids with numerous surface tumuli (arrow). (G) Surface of proglottid (arrow in F) showing shorter coniform spinitriches and 2 tumuli.
Figure 3. Bothriocephalus kupermani n in A New Species Of Bothriocephalus (Cestoda: Bothriocephalidae) From Lepomis Spp. (Actinopterygii: Centrarchidae) In North America
Figure 3. Bothriocephalus kupermani n. sp. from Lepomis gibbosus. Scoleces and proglottids. (A) From Paul Lake (dorsoventral view), (B) from Shawano Lake (dorsoventral view), (C) from Peter Lake (lateral view). (D) Vitelline follicles, from Caribou Lake. (E) Ovary, from Caribou Lake. (F) Testes, from Peter Lake. Color version available online.
Figure 2. Bothriocephalus kupermani n in A New Species Of Bothriocephalus (Cestoda: Bothriocephalidae) From Lepomis Spp. (Actinopterygii: Centrarchidae) In North America
Figure 2. Bothriocephalus kupermani n. sp. from Lepomis gibbosus. Anterior region of worms from different geographical locations showing features of the scolex and strobila. (A) Paul Lake (dorsoventral view), (B) Peter Lake (dorsolateral view), (C) Peter Lake (lateral view), and (D) Shawano Lake (dorsoventral view). Color version available online.
Figure 1. Bothriocephalus kupermani n in A New Species Of Bothriocephalus (Cestoda: Bothriocephalidae) From Lepomis Spp. (Actinopterygii: Centrarchidae) In North America
Figure 1. Bothriocephalus kupermani n. sp. from Lepomis gibbosus. (A) Scolex and anteriormost proglottids in lateral view (Peter Lake). (B, C) Scoleces and anteriormost proglottids in dorsoventral view (B from Paul Lake, C from Shawano Lake). (D) Distribution of ventral vitelline follicles in two last mature and first gravid proglottids (note presence of median follicles connecting both lateral fields of vitelline follicles); holotype. (E) Gravid proglottid, dorsal view; only most lateral and most median vitelline follicles illustrated on dextral side of proglottid.
Introgression and species delimitation in the longear sunfish Lepomis megalotis (Teleostei: Percomorpha: Centrarchidae)
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Kinematic integration during prey capture varies among individuals but not ecological contexts in bluegill sunfish, Lepomis macrochirus (Perciformes: Centrarchidae)
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Phylogeny and time scale of diversification in the fossil-rich Sunfishes and Black Basses (Teleostei: Percomorpha: Centrarchidae)
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