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Showing 1 to 20 of 27 for “"unionid"”.
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Population Genetic Structure of Unionid Mussels Across Multiple Gulf Drainages
… 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 …
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Sex-Associated Mitochondrial Genes: Tools for Understanding Unionid Reproduction and Development
Gonochoristic species of the bivalve order Unionida possess two types of mitochondria. The female-inherited mitochondria (F-mt) is found in the somatic cells of both sexes, while male-inherited mitochondria (M-mt) is found in the male gonad. These mitochondria possess different open reading frames …
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Acquired and Cross Immunity of Largemouth Bass (Micropterus Salmoides) to the Glochidia Larvae of Unionid Mussels
… glochidia larvae of freshwater mussels (family Unionidae) are temporary parasites of host fish, where they are contained within dermal cysts. The immune responses of largemouth bass (Micropterus salmoides) to glochidia of the broken rays mussel (Mapsilis reeveiana) were investigated to determine …
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Abiotic and biotic factors influencing the decline of native unionid mussels in the Clinch River, Virginia
Declining unionid populations in the Clinch River are of concern due to the high endemism in the diverse fauna of the Cumberlandian region. Increase in agricultural and mining activities, as well as in industry and urbanization, are coupled with unionid declines throughout the watershed. In many …
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Characteristics of the Unionid Community and Habitat in a Power Plant Thermal Plume in Western Lake Erie
Native unionids are endangered in the Laurentian Great Lakes due to habitat degradation and biofouling by dreissenids. However, a robust community was discovered living within the thermal discharge of a power plant at Oregon, Ohio, on the south shore of Lake Erie. Chapter 1 describes comparisons of …
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The physiological effects of elevated carbon dioxide, in the context of non-physical fish barriers, on unionid mussels
… organisms need to be defined. Freshwater unionid mussels are a non-target taxa that have the potential to be affected by elevated CO2. Unionid mussels are some of the most threatened taxa worldwide, with more than half (71%) of the species in North America listed as threatened, endangered, …
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Assessing Freshwater Mussels (Bivalvia: Unionidae) in South Dakota and Identifying Drivers of Assemblage Variation
<p>Native freshwater mussels (Family: Unionidae) are among the most threatened groups of freshwater fauna on Earth. Approximately 35 species have gone extinct since the 1900s and 72% of remaining species are considered endangered, threatened, or species of special concern. Unionid research can …
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Feeding morphology of juvenile Utterbackia imbecillis (Bivalvia:Unionidae)
… about this relatively little studied stage of unionid mussel development. Glochidia larvae were induced to metamorphose to juveniles by using in vitro culture techniques. Juveniles were reared in a recirculating flow through trough system. Specimens were collected weekly from 0-130 days, and …
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Energy Reserves in Native Freshwater Mussels (Bivalvia:Unionidae) with and without Attached Zebra Mussels: Effects of Food Deprivation
… 1) how zebra mussel infestation affects unionid feeding and body condition, 2) how starvation in quarantine affects body condition of unionids, and 3) what feeding regime maintain unionid condition in quarantine. The effects of zebra mussel infestation on two mussel species were evaluated …
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Integrating Taxonomic Meta-Analysis and Mussel Physiology to Assess Secondary Salinization in Appalachian Headwaters and Urban Streams
… positive effects. The limited representation of unionid mussel population responses in the literature precluded their inclusion in our analysis. However, studies have noted that elevated NaCl can influence mussel filtering behavior, potentially impacting other ecosystem processes. My second …
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Evolution of gender associated mitochondrial DNA in bivalves
<p>Bivalves of the families Unionidae and Mytilidae possess a unique mode of mitochondrial DNA inheritance dubbed sex-limited mitochondrial DNA (mtDNA) inheritance or doubly-uniparental inheritance (DUI). In contrast to the matrilineally restricted inheritance of mtDNA in other metazoans, these …
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The effects of natural and anthropogenic stressors on the stress response and tissue-level response in teleost fish
… found in North American freshwater environments. Unionid freshwater mussel larvae, called glochidia, must attach to a host fish in order to metamorphose into their juvenile state. This obligate stage in the unionid freshwater mussel life-cycle was found to cause a stress response in fish infected …
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Parasites in freshwater mussels: community ecology and conservation
… the ecosystem-engineering freshwater mussels (Unionida) and their macroparasites. As such, this thesis has three broad aims: to characterise knowledge to date on unionid mussel parasite communities and develop tools to further knowledge in this area; to analyse the drivers of parasite community …
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A Descriptive Survey of Freshwater Unionidae Bivalves in Five Creeks Located in West Central Georgia
… the West Georgia, Chattahoochee River drainage unionid bivalve fauna inhabiting Mountain Oak, Mulberry, Standing Boy, and Upatoi Creeks has been completed. The survey is intended to determine whether Unionidae populations remain extant in this portion of the Chattahoochee River drainage, and to …
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Population biology and fish hosts of several federally endangered freshwater mussels (Bivalvia: Unionidae) of the upper Tennessee River drainage, Virginia and Tennessee
… from amplified regions of mussel DNA. Thirty-six unionid species were incorporated into the key. No host fishes were identified due to an unsolved problem with amplifying DNA from glochidia collected from wild fish.
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Genetic and Life History Characteristics of Venustaconcha Ellipsiformis and Venustaconcha Pleasii (Bivalvia, Unionidae) in the Ozark Plateaus Region
… that host relations differ among closely related unionid species. Length at age of 426 individual Venustaconcha suggesting that sexual maturity usually occurs at age 4. Females grew more slowly than males after age 4. Growth rates for 1993 were significantly depressed in 4 of 7 populations …
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Reproductive biology and comparative growth rates of selected species of freshwater mussels (Bivalvia: Unionidae) in the New and Greenbrier Rivers, Virginia and West Virginia
The reproductive biology of four unionid mussels, Actinonaias carinata, Elliptio dilatata, Cyclonaias tuberculata, and Tritogonia verrucosa, from the New River in Virginia and West Virginia was investigated. The gametogenic cycle, length and timing of spawning and glochidial release periods, and …
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Holocene Mollusks of the Knife and Heart Rivers, Southwestern North Dakota
… 4 species of fossil terrestrial gastropods. The unionid family was represented in the Knife and Heart River by each having 6 species living presently and 4 species as fossil. The pisidiid family was represented in both rivers by two genera. The Knife River contained 7 species of aquatic …
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Population trends and ecological community interactions of freshwater mussels
Freshwater mussels (order Unionida) are a globally widespread taxon which have been described as ecosystem engineers due to their capacity to modify freshwater habitats and facilitate other taxa, with effects on wider biodiversity. At the same time, freshwater mussels rank among the most threatened …
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