False Spike,<i>Quadrula mitchelli</i>(Bivalvia: Unionidae), is Not Extinct: First Account of a Live Population in Over 30 Years

Randklev, Charles R.; Johnson, Matthew S.; Tsakiris, Eric T.; Rogers-Oetker, Susan; Roe, Kevin J.; Harris, John L.; McMurray, Stephen E.; Robertson, Clint; Groce, Julie E.; Wilkins, Neal

doi:10.4003/006.030.0213

Cited by 10 publications

(13 citation statements)

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“…Subsequent phylogenetic analyses focused on Fusconaia or Quadrula also did not address the systematic position of Q. mitchelli and it remains unresolved (Serb et al 2003;Burlakova et al 2012;Campbell and Lydeard 2012). Since the rediscovery of Q. mitchelli it has been primarily treated as a member of the genus Quadrula (Howells 2010; Randklev et al 2012;Mabe and Kennedy 2013;Randklev et al 2013a, b, c;Sowards et al 2013;Mabe and Kennedy 2014), although two online initiatives consider it a Fusconaia (Graf and Cummings 2014;IUCN 2015).…”

Section: Introductionmentioning

confidence: 96%

“…However, in the past decade at least eight of these ''extinct'' mollusks have been rediscovered Ó Foighil et al 2011;Randklev et al 2012;Whelan et al 2012), including Quadrula mitchelli (Simpson in Dall, 1896), a Central Texas endemic freshwater mussel. Historically Q. mitchelli was thought to be distributed across much of Central and West Texas including the Brazos, Colorado, Guadalupe, and Rio Grande drainages, but due to its nearly complete absence from decades of survey work it had been presumed extinct (Howells 1994;Howells et al 1997;Howells 2006;Haag 2009;Howells 2010;Burlakova et al 2011;Haag and Williams 2013).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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

et al. 2015

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“…The individual collected was consistent with taxonomic descriptions provided by Howells (2010) and measured 68.4 mm in shell length, representing a large adult. The presence of eggs in gonadal fluid extracted from the visceral mass clearly indicated that the individual was a lected in the Guadalupe River in 2011 (Randklev et al, 2012).…”

Section: Resultsmentioning

confidence: 99%

“…Over the last 30 years, considerable effort has been spent trying to locate live individuals of this species in stream segments where it historically occurred, but to date contemporary accounts are largely based on weathered shell material (Howells, 2010). The only exceptions are the discovery of several live individuals of Q. mitchelli in the Guadalupe River and a fresh dead individual in the San Saba River (Randklev et al, 2012;Randklev et al, in press). These accounts indicate that Q. mitchelli is still extant, but the absence of this species in other parts of its range suggest Q. mitchelli is no longer common, an observation reported as early as the 1970s (Stansbery, 1971).…”

Section: Introductionmentioning

confidence: 99%

Recent Collection of a False Spike (Quadrula mitchelli) in the San Saba River, Texas, with Comments on Habitat Use

Sowards

Tsakiris

Libson

et al. 2013

Freshwater Mollusk Biology and Conservation

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“…The southeastern United States harbors 94% of the approximately 300 mussel species known to reside within the country (Williams et al 1993), including 98% of the country's taxa listed as federally threatened or endangered . These animals provide valuable ecological services by filtering water and sequestering nutrients (Vaughn 2010) while providing food for migratory birds, small mammals, and turtles (Haag 2012 (Campbell et al 2008, Ó Foighil et al 2011, Randklev et al 2012, Holcomb et al 2015, Pfeiffer et al 2016, including the Suwannee moccasinshell Medionidus walkeri. This species is endemic to the Suwannee River basin (SRB) and has been considered threatened (Williams et al 1993), endangered (Williams & Butler 1994), and extremely rare and critically imperiled in previous assessments and is considered Critically Endangered by the International Union for the Conservation of N ature (IUCN ; www.…”

Section: Introductionmentioning

confidence: 99%

Early life history and spatiotemporal changes in distribution of the rediscovered Suwannee moccasinshell Medionidus walkeri (Bivalvia: Unionidae)

Johnson¹,

McLeod²,

Holcomb³

et al. 2016

Endang. Species. Res.

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Accurate distribution data are critical to the development of conservation and management strategies for imperiled species, particularly for narrow endemics with life history traits that make them vulnerable to extinction. Medionidus walkeri is a rare freshwater mussel endemic to the Suwannee River basin in southeastern N orth America. This species was rediscovered in 2012 after a 16-yr hiatus between collections and is currently proposed for listing under the US Endangered Species Act. Our study fills knowledge gaps regarding changes in distribution and early life history requirements of M. walkeri. Spatiotemporal changes in M. walkeri distribution are displayed using a conservation status assessment map incorporating data from 98 historical (1916 to 1999) and 401 recent (2000 to 2015) site surveys from museums and field notes representing records for 312 specimens. Recent surveys detected M. walkeri only in the middle Suwannee subbasin (n = 86, 22 locations) and lower Santa Fe subbasin (n = 2, 2 locations), and it appears the species may be extirpated from 67% of historically occupied 10-digit hydrologic unit code (HUC 10) watersheds. In our laboratory experiments, M. walkeri successfully metamorphosed on Percina nigrofasciata (56.2% ± 8.9) and Etheostoma edwini (16.1% ± 7.9) but not on Trinectes maculatus, Lepomis marginatus, Notropis texanus, Noturus leptacanthus, Etheostoma fusiforme, or Gambusia holbrooki. We characterize M. walkeri as a lure-displaying host fish specialist and a long-term brooder (bradytictic) that is gravid from fall to early summer of the following year. The early life history and distribution data presented here provide the baseline framework for listing decisions and future efforts to conserve and recover the species.

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False Spike,Quadrula mitchelli(Bivalvia: Unionidae), is Not Extinct: First Account of a Live Population in Over 30 Years

Cited by 10 publications

References 1 publication

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

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

Recent Collection of a False Spike (Quadrula mitchelli) in the San Saba River, Texas, with Comments on Habitat Use

Early life history and spatiotemporal changes in distribution of the rediscovered Suwannee moccasinshell Medionidus walkeri (Bivalvia: Unionidae)

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