Life at the leading edge: genetic impoverishment of the spotted bass, Micropterus punctulatus, at its Western edge

Ray, Jesse W.; Husemann, Martin; Lutz‐Carrillo, Dijar J.; King, Ryan S.; Danley, Patrick D.

doi:10.1007/s10641-015-0400-x

Cited by 6 publications

(18 citation statements)

References 29 publications

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“…The associated constriction of these drainages would be consistent with an estimated 50% reduction in population size reported for Spotted Bass in the Brazos River around 5,000 years ago (Ray et al. ). Pairwise genetic distance measures and two synapomorphies, present in the Trinity River group and other Spotted Bass but absent from Guadalupe Bass (with no synapomorphies found in alternative configurations) support this scenario.…”

Section: Discussionsupporting

confidence: 84%

“…Ray et al. () found the most common phenotypic Spotted Bass haplotype (mitochondrial control region) observed in the Brazos River (west of the Trinity River) was not observed in specimens from the Trinity River and suggested possible watershed‐scale population genetic structure was present. Based on our results, this division was based on different taxa in the Brazos and Trinity rivers rather than different Spotted Bass populations.…”

Section: Discussionmentioning

confidence: 99%

“…Genetic analyses (mitochondrial control region) focusing on specimens within Texas were performed by Ray et al. (), but the samples were limited to two drainages, with a large majority collected from a single drainage, and Spotted Bass and Guadalupe Bass could not be distinguished.…”

mentioning

confidence: 99%

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Hybridization and Genetic Structure in Phenotypic Spotted Bass in Texas

et al. 2018

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Hybridization is common in fishes and can result in a wide range of outcomes. The capture of a world record phenotypic Guadalupe Bass Micropterus treculii raised questions about potential hybridization with Spotted Bass M. punctulatus. Subsequent, limited genetic sampling from the drainage (Colorado River) did not indicate hybridization in the world record sample or other phenotypic Guadalupe Bass, but phenotypic Spotted Bass produced unexpected genotypes. This called into question the assumed distribution of Spotted Bass in Texas. To address this disconnect, phenotypic Spotted Bass were acquired from drainages surrounding the Colorado River, ranging from central Texas to the Texas–Louisiana border, and the number of sequenced loci was expanded from one to seven. Results indicated that the westernmost extent of nonintrogressed Spotted Bass populations in Texas was the Trinity River. Phenotypic Spotted Bass west of this drainage were identified as Guadalupe Bass or hybrids. Admixed individuals identified in the San Antonio and Brazos River drainages (and previously in the Colorado River) may represent part of a hybrid zone. We also found that Spotted Bass from the Trinity River exhibited relatively large genetic divergence from Spotted Bass to the east and may represent the product of a vicariance event. Finally, we confirmed one mitochondrial and two nuclear taxa‐specific genetic markers for the efficient discrimination of these congeners and their hybrids. These markers should be useful for resource agencies attempting to enforce management regulations given the difficulty of identifying Spotted Bass by phenotype.

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Section: Discussionsupporting

confidence: 84%

Section: Discussionmentioning

confidence: 99%

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Hybridization and Genetic Structure in Phenotypic Spotted Bass in Texas

et al. 2018

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“…; Ray et al . ). Dependent on the species specific situation, these unexpected observations have been explained by a variety of biological and/or evolutionary genetics mechanisms: large numbers of founding propagules (Simberloff ), parallel introduction events from diverse source populations (Durka et al .…”

Section: Introductionmentioning

confidence: 97%

The invasive bighead goby Ponticola kessleri displays large‐scale genetic similarities and small‐scale genetic differentiation in relation to shipping patterns

et al. 2016

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Colonization events, range expansions and species invasions leave genetic signatures in the genomes of invasive organisms and produce intricate special patterns. Predictions have been made as to how those patterns arise, but only very rarely, genetic processes can be monitored in real time during range expansions. In an attempt to change that, we track a very recently established invasive population of a fish species, the bighead goby Ponticola kessleri, with high temporal and spatial resolution through 2 years to identify patterns over time. We then compare Swiss and German samples of bighead goby along the river Rhine using microsatellites, mitochondrial D-loop sequences and geometric morphometrics to investigate geographic patterns. We detect weak temporal and strong geographic patterns in the data, which are inconsistent with isolation by distance and indicate long range transport. In search of an explanation for our observations, we analyse the vector properties and travel patterns of commercial vessels on the river Rhine. We present evidence that freshwater cargo ships and tankers are plausible vectors for larvae of invasive goby species. We also present indications that cargo ships and tankers act as differential vectors for this species. In summary, we present genetic data at unique temporal resolution from a vertebrate invasion front and substantiate the paramount role of commercial shipping in freshwater fish translocations.

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“…; Ray et al . ). Alternatively, the habitat at Illala Gap might be suboptimal for the species and therefore has a lower capacity.…”

Section: Discussionmentioning

confidence: 97%

A genetic demographic analysis of Lake Malawi rock‐dwelling cichlids using spatio‐temporal sampling

et al. 2015

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We estimated the effective population sizes (Ne ) and tested for short-term temporal demographic stability of populations of two Lake Malawi cichlids: Maylandia benetos, a micro-endemic, and Maylandia zebra, a widespread species found across the lake. We sampled a total of 351 individuals, genotyped them at 13 microsatellite loci and sequenced their mitochondrial D-loop to estimate genetic diversity, population structure, demographic history and effective population sizes. At the microsatellite loci, genetic diversity was high in all populations. Yet, genetic diversity was relatively low for the sequence data. Microsatellites yielded mean Ne estimates of 481 individuals (±99 SD) for M. benetos and between 597 (±106.3 SD) and 1524 (±483.9 SD) individuals for local populations of M. zebra. The microsatellite data indicated no deviations from mutation-drift equilibrium. Maylandia zebra was further found to be in migration-drift equilibrium. Temporal fluctuations in allele frequencies were limited across the sampling period for both species. Bayesian Skyline analyses suggested a recent expansion of M. zebra populations in line with lake-level fluctuations, whereas the demographic history of M. benetos could only be estimated for the very recent past. Divergence time estimates placed the origin of M. benetos within the last 100 ka after the refilling of the lake and suggested that it split off the sympatric M. zebra population. Overall, our data indicate that micro-endemics and populations in less favourable habitats have smaller Ne , indicating that drift may play an important role driving their divergence. Yet, despite small population sizes, high genetic variation can be maintained.

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Life at the leading edge: genetic impoverishment of the spotted bass, Micropterus punctulatus, at its Western edge

Cited by 6 publications

References 29 publications

Hybridization and Genetic Structure in Phenotypic Spotted Bass in Texas

Hybridization and Genetic Structure in Phenotypic Spotted Bass in Texas

The invasive bighead goby Ponticola kessleri displays large‐scale genetic similarities and small‐scale genetic differentiation in relation to shipping patterns

A genetic demographic analysis of Lake Malawi rock‐dwelling cichlids using spatio‐temporal sampling

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