R.J. Neves's research while affiliated with Virginia Tech (Virginia Polytechnic Institute and State University) and other places
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Publications (152)
Understanding and monitoring life history traits is often important in endangered species conservation. Populations of the endangered mussel Cumberlandian combshell Epio - blasma brevidens have continued to decline in the Powell River, USA. Understanding and modeling mussel growth is critical for effective reintroduction of this endangered species....
The North Fork Holston River (NFHR) historically supported 33 unionid mussel species downstream of Saltville, VA. Because of industrial contamination over decades from a chlor-alkali plant, a U.S. Environmental Protection Agency Superfund Site (SITE) was created with Hg and MeHg designated as contaminants of concern. Mussel surveys were conducted a...
We conducted a genetic characterization of two extant populations of an endangered freshwater mussel, the rough pigtoe Pleurobema plenum, in the Clinch River, Tennessee and the Green River, Kentucky, of the Ohio River basin, U.S.A., for purposes of conservation recovery planning. First, phylogenetic status of this species within the Pleurobema cord...
The federally endangered Cumberlandian combshell (Epioblasma brevidens) was propagated and reared to taggable size (5–10 mm), and released to the Powell River, Tennessee, to augment a relict population. Methodology using passive integrated transponder (PIT) tags on these mussels greatly facilitated the detection process. The overall mean detection...
Genetic variation was examined in two endangered mussel species, Epioblasma brevidens and Epioblasma capsaeformis, and in a non-listed species, Lampsilis fasciola, in the Clinch River, Tennessee, USA, by screening mitochondrial DNA (mtDNA) sequences and nuclear DNA microsatellites. Patterns of mtDNA polymorphism exhibited different trends in long-t...
The Clinch River is located in northeastern Tennessee (TN) and southwestern Virginia (VA) of the United States, and contains a diverse mussel assemblage of 46 extant species, including 20 species listed as federally endangered. To facilitate quantitative monitoring of the fauna, quadrat data were collected from 2004 to 2009 at 18 sites in the river...
The effects of algal density, water flow and substrate type on the survival and growth of newly metamorphosed juveniles of the rainbow mussel (Villosa iris) were investigated in 40 l recirculating culture systems. A split-plot design with a whole plot factor combining algal density and water flow, and a split-plot factor of substrate were applied i...
The Powell River, located in southwestern Virginia and northeastern Tennessee, is a tributary of the Clinch River in the headwaters of the Tennessee River system. Historically, the Powell River had a diverse freshwater mussel fauna of 46 species. Various surveys conducted over the past century have recorded a decline in mussel densities and diversi...
We present an amino acid racemization-based age calibration with sub-centennial resolution from historical specimens of several species of the freshwater mussel genus, Lampsilis, from multiple river basins in the eastern United States. Valve samples that were bleached to isolate the intra-crystalline fraction of amino acids resulted in more consist...
Population performance criteria to evaluate reintroduction and recovery of two endangered mussel species, Epioblasma brevidens and Epioblasma capsaeformis (Bivalvia, Unionidae.) Jess W. Jones, Richard J. Neves & Eric M. Hallerman. ABSTRACT: Genetic and demographic modeling of two endangered mussel species, Epioblasma brevidens and E. capsae-formis,...
We report on multiple patterns of differentiation and connectivity in the fanshell pearlymussel (Cyprogenia stegaria), based on different markers. Knowledge of genetic variation and genetic connectivity among remaining populations of this federally endangered species is needed to initiate implementation of the species recovery plan. We collected ti...
1.Variation in age, shell growth, and demographic responses of two endangered mussel species, Epioblasma brevidens and Epioblasma capsaeformis, and a third non-listed species, Lampsilis fasciola, were studied from 2004–2008 in a 32-km reach of the Clinch River, TN.2.Observed maximum age and length of E. brevidens was 28 yr and 71.5 mm for males and...
A new species and a new subspecies of Epioblasma are described from the Tennessee River drainage, USA. Epioblasma ahlstedti (Duck River Dartersnapper) currently is restricted to the Duck River in west-central Tennessee (TN). However, museum collections indicate that the species likely occurred in the Buffalo River, TN, a tributary to the Duck River...
The life history and population demography of the endangered birdwing pearlymussel (Lemiox rimosus) were studied in the Clinch and Duck rivers, Tennessee. Reproducing populations of L. rimosus now occur only in the Clinch, Duck and Powell rivers, as the species is considered extirpated from the remaining portions of its range in the Tennessee River...
Previous freshwater mussel surveys conducted in Copper Creek showed a decline in the fauna from 1980 to 1998. In 2004 and 2005, we sampled 47 sites acquiring relative abundance estimates (measured in catch-per-unit-effort) to assess the current status of the mussel fauna relative to previous surveys. We also obtained absolute density estimates for...
Freshwater mussel conservation efforts by many federal and state agencies have increased in recent years. This has led to a greater number of stream surveys, in which mussel die-offs involving high numbers of dead and moribund animals are being observed and reported with greater frequency. Typically, die-offs have been incidentally observed while r...
Appropriate inference of population status for endangered species is extremely important. Using a single model for estimating population growth rates is typically inadequate for assessing endangered species because inferences based on only one "best" model ignore model uncertainty. In this study, the endangered dromedary pearlymussel (Dromus dromas...
![FIG. 4. Toxicity (median effective concentrations [EC50] 6 95% CI) of...](profile/Miles-Barnhart/publication/228338652/figure/fig3/AS:670698716540940@1536918443869/Toxicity-median-effective-concentrations-EC50-6-95-CI-of-NaCl-and-Cu-in-water-only_Q320.jpg)
Freshwater mussels (superfamily Unionoidea) are in serious global decline and in urgent need of protection and conservation. The declines have been attributed to a wide array of human activities resulting in pollution and water-quality degradation, and habitat destruction and alteration. Linkages among poor water quality, pollutant sources, and mus...
The reproductive tracts of dioecious Villosa iris (Lea, 1829) and hermaphroditic Utterbackia imbecillis (Say, 1829) are described and compared in sections of viscera examined with light and transmission electron microscopy. In both species, gametes are transported via ciliated gonoducts to a collecting gonosinus, connected to a ciliated genital duc...
The objective of the present study was to determine acute toxicity of copper, ammonia, or chlorine to larval (glochidia) and juvenile mussels using the recently published American Society for Testing and Materials (ASTM) Standard guide for conducting laboratory toxicity tests with freshwater mussels. Toxicity tests were conducted with glochidia (24...
The present study evaluated the performance and variability in acute toxicity tests with glochidia and newly transformed juvenile mussels using the standard methods outlined in American Society for Testing and Materials (ASTM). Multiple 48-h toxicity tests with glochidia and 96-h tests with juvenile mussels were conducted within a single laboratory...
The objectives of the present study were to develop methods for conducting chronic toxicity tests with juvenile mussels under flow-through conditions and to determine the chronic toxicity of copper and ammonia to juvenile mussels using these methods. In two feeding tests, two-month-old fatmucket (Lampsilis siliquoidea) and rainbow mussel (Villosa i...
Pink heelsplitter mussels Potamilus alatus were held at two bottom locations and suspended in pocket nets in a pond at the Freshwater Mollusk Conservation Center, Virginia Polytechnic Institute and State University, for 1 year to evaluate survival in captivity. Survival after 1 year differed significantly; the poorest survival (30.0%) was at the bo...
The effects of sampling frequency and substrate size on the overall size and survival of juvenile rainbow mussels Villosa iris were investigated in 4-L round flow-through tanks. All tanks contained either fine sediment (<50 μm), fine limestone sand (500-850 μm), or coarse limestone sand (1,000-2,500 μm) and were sampled every 2 weeks or once at the...
To determine whether DNA could be isolated from tissues obtained by brush-swabbing the mantle, viscera and foot, mantle-clips and swabbed cells were obtained from eight Quadrula pustulosa (Lea, 1831). DNA yields from clips and swabbings were 447.0 and 975.3 ηg/μL, respectively. Furthermore, comparisons of sequences from the ND-1 mitochondrial gene...
Chlorine (Cl) is a highly toxic, widely used halogen disinfectant that is present in point-source pollution discharges from wastewater treatment plants and industrial facilities. The U.S. Environmental Protection Agency freshwater criteria for Cl are 19 microg total residual Cl (TRC)/L as a maximum 1-h average concentration and 11 microg TRC/L as a...
Although the greatest global diversity of freshwater mussels (∼300 species) resides in the United States, the superfamily Unionoidea is also the most imperiled taxon of animals in the nation. Thirty-five species are considered extinct, 70 species are listed as endangered or threatened, and approximately 100 more are species of conservation concern....
Species in the genus Epioblasma have specialized life history requirements and represent the most endangered genus of freshwater mussels (Unionidae) in the world. A genetic characterization of extant populations of the oyster mussel Ep. capsaeformis and tan riffleshell Ep. florentina walkeri sensu late was conducted to assess taxonomic validity and...
