Is False Spike,<i>Quadrula mitchelli</i>(Bivalvia: Unionidae), Extinct? First Account of a Very Recently Deceased Individual in Over Thirty Years

Randklev, Charles R.; Tsakiris, Eric T.; Johnson, Matthew S.; Skorupski, Joseph A.; Burlakova, Lyubov E.; Groce, Julie E.; Wilkins, Neal

doi:10.1894/0038-4909-58.2.247

Cited by 7 publications

(3 citation statements)

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“…mitchelli is now restricted to the Guadalupe drainage. To date, stronghold subpopulations for this species occur primarily in the lower Guadalupe downstream of Gonzales, Texas (Randklev, Tsakiris, Howells, et al, 2013; Randklev, Tsakiris, Johnson, et al, 2013), and no live records of F . mitchelli in the upper Guadalupe have been reported (Figure 6; Fig.…”

Section: Discussionmentioning

confidence: 99%

“…mitchelli were unknown. The taxon was assigned to the genus Quadrula Rafinesque, 1820 based on morphology and phylogenetic positioning of assumed closely related species (Howells et al, 1996; Randklev et al, 2012; Randklev, Tsakiris, Johnson, et al, 2013); however, taxonomic placement remained an enigmatic issue toward understanding the basic biology and ecology of the species. Recent molecular genetic analyses revealed that F .…”

Section: Introductionmentioning

confidence: 99%

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Resolving species boundaries in the critically imperiled freshwater mussel species,Fusconaia mitchelli(Bivalvia: Unionidae)

Smith

Johnson

Havlik

et al. 2020

J. Zool. Syst. Evol. Res.

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Species are a fundamental unit of biology, and defining accurate species boundaries is integral to effective conservation and management of imperiled taxa. Freshwater mussels (Bivalvia: Unionidae) are among the most imperiled groups of organisms in North America, yet species boundaries remain uncertain for many taxa. The False Spike, Fusconaia mitchelli (Simpson in Dall, 1895), is a freshwater mussel considered to be endemic to central Texas (Brazos, Colorado, and Guadalupe drainages). Recent research revealed significant intraspecific genetic variation between geographically separated populations of F. mitchelli, which could be indicative of speciation; however, small sample sizes for several of the populations precluded formal taxonomic revision. Here, we increase taxon sampling and use multilocus DNA sequence data and traditional morphometrics to re-evaluate species boundaries in F. mitchelli. We sequenced three loci: the protein-coding mitochondrial DNA genes cytochrome c oxidase subunit 1 and NADH dehydrogenase 1, and the nuclear internal transcribed spacer 1. Phylogenetic analyses depicted deep genetic divergence between F. mitchelli in the Guadalupe and those in the Brazos and Colorado drainages, which was further supported by available biogeographic information. Morphometric analyses and coalescent-based species delimitation models integrating both DNA sequence and morphological data provided strong support for the divergence observed between the two geographically isolated clades of F. mitchelli. Based on these results, we revise taxonomy accordingly by elevating the junior synonym Fusconaia iheringi (Wright, 1898) to represent the Brazos and Colorado populations and restrict the distribution of F. mitchelli to the Guadalupe River drainage. Our findings may impact pending management decisions to protect F. mitchelli under the U.S. Endangered Species Act.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Resolving species boundaries in the critically imperiled freshwater mussel species,Fusconaia mitchelli(Bivalvia: Unionidae)

Smith

Johnson

Havlik

et al. 2020

J. Zool. Syst. Evol. Res.

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“…In addition to removing damaged and potentially hazardous dams from Texas waterways, dam removal provides a way to restore riverine habitat for Texas' aquatic species. In particular, freshwater mussels have been receiving increased attention in Texas due to concerns over their conservation status (Randklev et al 2010;Winemiller et al 2010;Burlakova et al 2011aBurlakova et al , 2011bKaratayev et al 2012;Randklev et al 2013aRandklev et al , 2013bKaratayev et al 2018;Dascher et al 2018). There are approximately 50 known species of mussels that inhabit Texas (Howells et al 1996).…”

Section: Dam Removals In Texasmentioning

confidence: 99%

Dams Are Coming Down, but Not Always by Choice: The Geography of Texas Dams, Dam Failures, and Dam Removals

Dascher

Meitzen

2020

Texas Water Journal

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This study examines spatial and temporal trends in Texas dams, dam failures, and dam removals. Dams were examined from a state-wide perspective and within 10 major river basins that collectively account for over 80% of all dams in the state. The state-scale and basin-scale analysis revealed similar patterns of dam occurrence, however there was greater variation in the patterns observed in both the purpose of dams and the timing for when most of the storage was created in each basin. Climate factors, mainly precipitation, influenced dam location. Population was not directly measured in this study but was an obvious influence on the spatial distribution of dams and their functions. While new dams are being built in Texas to secure future water supplies, documented dam incidents/failures have occurred in 15 of the 23 major river basins in Texas, with 328 total instances occurring since 1900. As the number of newly constructed dams and dam failures continue to grow across the state, so should the number of planned dam removals. Between 1983 and 2016, 50 dams have been removed across the state. The purpose for the majority of removals was to eliminate liability concerns associated with aging dams. Future dam removals will likely continue to occur based on the number of older, smaller dams with potential liability concerns. As Texas’ dam infrastructure continues to age, dam removal is a practical management option for mitigating potential dam-related hazards and improving the connectivity and ecological function of the river systems. Citation: Dascher ED, Meitzen K. 2020. Dams are coming down, but not always by choice: the geograph of Texas dams, dam failures, and dam removals. Texas Water Journal. 11(1):89-129. Available from: https://doi.org/10.21423/twj.v11i1.7092.

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Generic reclassification and species boundaries in the rediscovered freshwater mussel ‘Quadrula’ mitchelli (Simpson in Dall, 1896)

et al. 2015

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The Central Texas endemic freshwater mussel, Quadrula mitchelli (Simpson in Dall, 1896), had been presumed extinct until relict populations were recently rediscovered. To help guide ongoing and future conservation efforts focused on Q. mitchelli we set out to resolve several uncertainties regarding its evolutionary history, specifically its unknown generic position and untested species boundaries. We designed a molecular matrix consisting of two loci (cytochrome c oxidase subunit I and internal transcribed spacer I) and 57 terminal taxa to test the generic position of Q. mitchelli using Bayesian inference and maximum likelihood phylogenetic reconstruction. We also employed two Bayesian species validation methods to test five a priori species models (i.e. hypotheses of species delimitation). Our study is the first to test the generic position of Q. mitchelli and we found robust support for its inclusion in the genus Fusconaia. Accordingly, we introduce the binomial, Fusconaia mitchelli comb. nov., to accurately represent the systematic position of the species. We resolved F. mitchelli individuals in two well supported and divergent clades that were generally distinguished as distinct species using Bayesian species validation methods, although alternative hypotheses of species delineation were also supported. Despite strong evidence of genetic isolation within F. mitchelli, we do not advocate for species-level status of the two clades as they are allopatrically distributed and no morphological, behavioral, or ecological characters are known to distinguish them. These results are discussed in the context of the systematics, distribution, and conservation of F. mitchelli.

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Is False Spike,Quadrula mitchelli(Bivalvia: Unionidae), Extinct? First Account of a Very Recently Deceased Individual in Over Thirty Years

Cited by 7 publications

References 1 publication

Resolving species boundaries in the critically imperiled freshwater mussel species,Fusconaia mitchelli(Bivalvia: Unionidae)

Resolving species boundaries in the critically imperiled freshwater mussel species,Fusconaia mitchelli(Bivalvia: Unionidae)

Dams Are Coming Down, but Not Always by Choice: The Geography of Texas Dams, Dam Failures, and Dam Removals

Generic reclassification and species boundaries in the rediscovered freshwater mussel ‘Quadrula’ mitchelli (Simpson in Dall, 1896)

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