Download or read book The Population Genetic Structure of Quadrula Aurea Bivalvia Unionidae A Threatened Freshwater Mussel in Central Texas written by Jeffrey A. Mabe and published by . This book was released on 2018 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: The anthropogenic alteration of riverine ecosystems has led to declines in the abundance and diversity of freshwater mussels (Bivalvia: Unionoida) worldwide. Central Texas is home to a diverse freshwater mussel fauna including three candidates for federal listing under the Endangered Species Act. Surveys conducted over the last few decades suggest many of the endemic freshwater mussel species in Texas exist in small isolated populations that may be vulnerable to the deleterious effects of genetic diversity loss. Microsatellite primers from two closely related species were used to identify a set of genetic markers that functioned in the Golden Orb (Quadrula aurea). Microsatellite markers were then applied to document the population genetic structure of Q. aurea within and among three connected river drainages in southeastern Texas. Gene flow within existing Q. aurea populations appears high indicating little potential for genetic issues stemming from isolation and inbreeding. Two weakly divergent admixed populations were identified occupying the San Antonio and Guadalupe/San Marcos rivers. Population genetic structure was related to river basin affiliation, but results for environmental factors were unresolved. Current effective population size estimates are large for the Guadalupe/San Marcos drainage and moderately large for the San Antonio drainage and there is no clear genetic evidence of contemporary population declines. Transport in the glochidial phase by a highly mobile host fish, the channel catfish (Ictalurus punctatus), may provide a mechanism for maintaining connectivity among spatially discrete mussel beds and deserves further study. Information on the occurrence and habitat associations of Q. aurea and two other threatened freshwater mussel species was documented. Quantification of the population genetic structure for Q. aurea provides important information needed for the management of this species, a baseline for understanding future changes, and insight into the factors that shape the population genetic structure of other threatened unionids in Texas.
Download or read book Population Genetic Structure of the Freshwater Mussel Lampsilis Siliquoidea bivalvia Unionidae in the Darby Creek Watershed Central Ohio written by Marnin D. Wolfe and published by . This book was released on 2006 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Population Genetic Structure of Unionid Mussels Across Multiple Gulf Drainages written by Matthew Stewart Harrison and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding patterns of genetic differentiation within and across wildlife populations is a key component to parsing the demographic and ecological processes that govern the spatial structure and evolutionary trends of a given species. As molecular and computational techniques continue to advance, these data have become critical tools in delineating population boundaries as well as informing appropriate management decisions. This study utilized a genotyping by sequencing (GBS) approach to study the genetic structure of three Texas state threatened mussel species of family Unionidae: Pleurobema riddellii (Louisiana Pigtoe), Fusconaia askewi (Texas Pigtoe), and Potamilus amphichaenus (Texas Heelsplitter). Principal component and admixture analyses paired with genetic distance estimates (GST) of these species demonstrated clear interspecific and intraspecific differentiation across separate drainages as well as indications of isolation within drainages potentially facilitated by geographic barriers such as river impoundments and local environmental and ecological differences. These data present an effective approach to modeling genetic structure across a landscape that allow for precise inferences on population boundaries that inform conservation units (CU's) and the management strategies that use them (Funk et al., 2012; Smith et al., 2021).
Download or read book Freshwater Mussels of Texas written by Robert G. Howells and published by University of Texas Press. This book was released on 1996-09 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: Species. Freshwater mussels are the most rapidly declining group of animals in North America. This guide represents a first-ofits-kind reference to assist both biologists and naturalists in the identification and study of freshwater mussels. Freshwater Mussels of Texas contains 224 pages with 226 black and white photographs, 144 color photographs and 79 line drawings covering all 52 species found in Texas waters. Introductory sections cover basic anatomy, reproduction.
Download or read book Conservation Genetics of a Near Threatened Freshwater Mussel Species Lampsilis Cardium and Improved Prospects for Recovery written by Chad D. Ferguson and published by . This book was released on 2009 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: Freshwater mussels (Bivalvia: Unionidae) are among the most imperiled organisms in North America. While there is an urgent need for effective conservation planning and management of these organisms, important basic biological information is lacking. This research characterizes levels of genetic diversity and population structure in the Near Threatened (IUCN) freshwater mussel Lampsilis cardium in populations from Twin Creek (southwest Ohio), Little Darby and Big Darby Creeks (central Ohio), and Little Muskingum River (eastern Ohio) and assesses the extent to which regional geological events explain population structuring. Data from the congener Lampsilis ovata from Clinch River (Tennessee) are included for comparison. To characterize these patterns, sequencing of the mtDNA gene cytochrome oxidase c subunit 1 (COI) and nuclear microsatellite genotyping over 12 loci was performed. Additionally, genotype data from both adults and individual glochidia were analyzed to examine parentage and within-population levels of relatedness across common pedigree relationships. Microsatellite data reveal weak population structuring across glaciated and unglaciated drainages and 900 total river miles. However, haplotype analysis and sequence alignment recovered deeply divergent, cryptic lineages within Lampsilis cardium consistent with ancestral introgressive hybridization with Lampsilis ovata or incomplete lineage sorting. Mito-nuclear discordance argues against ongoing hybridization, although polymorphic species are also consistent with the data, and this affirms the importance of multiple molecular markers. In addition to finding multiple paternity in single broods, a number of parent-offspring, full-sibling, and half-sibling relationships for adults and glochidia are described. Numerous instances are noted in which likely full-siblings or half-siblings were located several kilometers apart, demonstrating that DNA-based evidence can describe the spatial nature of dispersal in unionid mussels. In a first report, the likely father of three glochidia from one female's brood was identified 16.2 kilometers upstream, which suggests the possibility of long-distance transport of spermatozoa in Lampsilis cardium. Given the similarity with which Lampsilines reproduce, it is predicted that other members of this genus are also capable long-distance fertilization. If fertilization in populations of freshwater mussels is indeed not limited by the density of breeding adults, the prospects for recovery in this fauna may be better than recently imagined.
Download or read book Signature of Postglacial Colonization on Contemporary Genetic Structure and Diversity of Quadrula Quadrula Bivalvia Unionidae written by Philip Thomas Mathias and published by . This book was released on 2016 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Phylogeography and Genetic Structure of Two Freshwater Mussel Species Bivalvia Unionidae Along Hypothesized Post glacial Dispersal Routes Into the Laurentian Great Lakes written by Trevor L. Hewitt and published by . This book was released on 2015 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Movement Behavior of Unionid Mussels in Central Texas written by Bianca Alexandra Hernández and published by . This book was released on 2016 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: Freshwater mussels are one of the most imperiled groups of aquatic organisms. Burrowing and horizontal movement of freshwater mussels are behaviors integral to their ecology, yet mussel behavior is still relatively understudied. Thus, more insight into mussel behavior is needed to establish effective survey protocols and to inform the development of long-term conservation strategies. My objectives were to 1) examine and compare burrowing depth in the field among species and sites in the Guadalupe and San Antonio Rivers; 2) examine the effect of (a) differences in species, (b) decreases in temperature and (c) different substrates on burrowing behavior in experimental studies; and 3) examine the effect of dewatering on movement behavior. Seasonal differences were found at two sites in the San Marcos and Guadalupe River, with more mussels burrowing deeper in winter. In contrast, this was not observed at a predominately sandy site in the San Antonio River, where mussels burrowed significantly deeper compared to the other gravel/cobble dominated sites, independent of season. Lab experiments showed that differences in substrate affected burrowing behavior, and mussels responded to temperature changes. Burrowing depth was significantly deeper in sand compared to gravel. Further, when temperature was decreased from above 20°C to 15°C, 9% of the mussels stopped burrowing in sand but 58% stopped in gravel. Significant differences between species were only found in lab experiments with sand, in which Amblema plicata burrowed significantly deeper than Quadrula aurea. Horizontal movement rates differed significantly when comparing dewatering manipulations. At the fastest dewatering manipulation (15 cm/6 hours), 100% of the mussels became stranded, whereas 20 to 30% became stranded during slow (5 cm/10 days) and moderate (10 cm/4 days) dewatering manipulations. Thus, mussels in Central Texas may not have the ability to respond fast enough when water levels change rapidly, i.e., due to operations of dams. Our results also suggest that surveys may need to follow different guidelines depending on local conditions.
Download or read book Freshwater Mussels Unionidae of the Pimpleback complex Quadrula Spp in Texas written by Robert G. Howells and published by . This book was released on 2002 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Identification of Potential Fish Hosts from Wild Populations of State threatened East Texas Freshwater Mussels Using a Molecular Identification Dataset written by NATHANIEL T. MARSHALL and published by . This book was released on 2014 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Population Genetic Structure and Taxonomic Evaluation of Two Closely Related Freshwater Mussel Species the Eastern Floater Pyganodon Cataracta and the Newfoundland Floater Pyganodon Fragilis in Atlantic Canada written by Ljiljana Marija Stanton and published by . This book was released on 2008 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Diatom based Water Quality Metric for Texas State threatened Mussels Unionidae written by Leah Alexis Woolam and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Freshwater mussels are among the most imperiled group of aquatic invertebrates, with over 72% of North American species threatened or endangered. As a major river in Texas, the Colorado River has ~23 unionid species and presents an opportunity for the implementation of mussel conservation practices. Freshwater mussels can be specialized based on their environmental optima and sensitivity, so habitat selection is crucial for prioritizing conservation areas and introducing new populations. In order to evaluate the feasibility of reintroduction efforts, tailored a diatom-based water quality metric was developed using artificial streams constructed to simulate natural stream conditions in the Colorado River. A 10-week experiment cultured and monitored shifts in diatom assemblages under manipulated drought and nutrient conditions. Some notable community shifts were the loss of Cyclostephanos dubius in the early weeks, the steady increase in the Nitzschia spp., and the dominance of Rhopalodia gibba in the final weeks. By the end of the experiment, both high water streams converged on similar assemblage structure. The low water streams, however, diverged somewhat in species composition, yet were more comparable to each other than to the assemblages in the two high water streams. Based on the results of the artificial stream experiments, an Index of Biotic Integrity (IBI) was developed, which were applied in the field to assess mussel habitat quality in the middle Colorado River. There was no significant difference between the three sites at which ground truth surveys were conducted. This study suggests that additional factors to diatom assemblages, such as substrate type, drought conditions, and the presence of fish hosts for dispersal, should be considered when assessing the habitat quality of potential mussel relocation sites.
Download or read book Freshwater Mussels Unionidae in Texas Rivers written by Michael James Cook and published by . This book was released on 2008 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Freshwater bivalve mollusks (Unionidae) are among the most imperiled faunal groups in North America due to anthropogenic habitat alterations. This study conducted between September 2006 and July 2007 determined the present population status of unionids in the Brazos, San Antonio, and Lower Sabine River basins. Qualitative and Semi-quantitative sampling methods were used to conduct our survey. Abiotic parameters (pH, dissolved oxygen, turbidity, water temperature, water velocity, depth, TDS and substrate type) were recorded for each location and site. Thirteen species were found in the Brazos River Basin, 4 species in the San Antonio River Basin, and 1 species in the Sabine River Basin. Water turbidity and velocity at 60% of depth were significantly associated (Beta=0.645; p
Download or read book A Preliminary Review of the Nominal Genus Villosa of Freshwater Mussels Bivalvia Unionidae in North America written by G. Thomas Watters and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Population Biology and Fish Hosts of Several Federally Endangered Freshwater Mussels Bivalvia Unionidae of the Upper Tennessee River Drainage Virginia and Tennessee written by Brian Thomas Watson and published by . This book was released on 1999 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Holistic Approach to Taxonomic Evaluation of Two Closely Related Endangered Freshwater Mussel Species the Oyster Mussel Epioblasma Capsaeformis and Tan Riffleshell Epioblasma Florentina Walkeri Bivalvia Unionidae written by Jess Walter Jones and published by . This book was released on 2004 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: Genetic management guidelines were developed to assess taxonomic status, genetic variation of donor-recipient populations targeted for augmentation, and field and laboratory protocols to maximize genetically effective population size, minimize genetic changes in captive-reared progeny, and prevent the release of juvenile mussels into non-native drainages. A pragmatic approach to species recovery is advocated; one that incorporates the principles of conservation genetics into breeding programs, but prioritizes the immediate demographic needs of critically endangered mussel species.
Download or read book Exploring Levels of Genetic Variation in the Freshwater Mussel Genus Villosa Bivalvia Unionidae at Different Spatial and Systematic Scales written by Kody F. Kuehnl and published by . This book was released on 2009 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt: Finally, using two federally endangered freshwater mussels, Pleurobema clava and Epioblasma torulosa rangiana; we provide a framework for evaluating potential sites for relocation, translocation, and reintroduction in two Ohio watersheds. This framework includes a discussion of past and current threats, conservation activities, and identifies biological and physical criteria that can be used to evaluate potential sites for conservation activities.
