Download or read book Growth and Condition of the Invasive Asian Clam Corbicula Fluminea in the Lower Columbia River USA written by Summer J. Henricksen and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Asian clam, Corbicula fluminea, is a broadly distributed and abundant invasive species, yet many aspects of its population biology (e.g., growth and condition in relation to environmental variables) are not well understood. Based on previous research by other investigators, we hypothesized that abundance, population growth rate, and individual growth rate of C. fluminea would increase with temperature, chlorophyll-a, and dissolved oxygen. We sampled C. fluminea at two sites (Kalama and Blurock) in the lower Columbia River (CR), USA. Modal progression analyses indicated a life span of 2-3 years, with new young-of-the-year recruits ( 15 mm), one-year old (13-25 mm), two-year old (20-33mm), and three-year old (30-43mm) clams present. A generalized linear mixed model (GLMM) predicting the abundance of C. fluminea indicated a significant negative association with chlorophyll-a concentration, whereas a GLMM predicting the population growth rate of C. fluminea indicated a significant positive association with dissolved oxygen. The GLMM predicting the individual growth rate of C. fluminea indicated the individual growth rate was not significantly related to any individual environmental variable, however the interaction between temperature and year was significant. The morphological condition (weight at length) of C. fluminea varied significantly between our two sites, with smaller clams (
Download or read book Broadscale Distribution Abundance and Habitat Associations of the Invasive Asian Clam Corbicula Fluminea in the Lower Columbia River USA written by Salvador B. Robb-Chavez and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Asian clam, Corbicula fluminea, is an invasive freshwater bivalve that has established populations across the globe and is known to have deleterious effects on natural and human systems. Yet, despite being present in the Columbia River (CR) for nearly a century, little is known about this invader's basic biology and ecology in this large river system. Thus, we undertook a field study to assess its i) broadscale distribution and abundance, ii) associations with habitat characteristics, and iii) weight-at-length relationship in the lower CR. During 2019-21, C. fluminea were collected from 27 shore-based and 15 mid-channel stations spanning 481 river kilometers (RKM) of the lower CR, along with several habitat characteristics (bank slope, temperature, dissolved oxygen, pH, salinity, conductivity, depth, Secchi depth, chlorophyll-a concentration, river kilometer, and sediment composition). C. fluminea abundance ranged from 0-430 ind. m-2, with the majority of sites containing abundances >100 ind. m-2, located downstream from Bonneville Dam and the majority of sites containing abundances of 0 ind. m-2 located upstream. Generalized linear models predicting the abundance of C. fluminea indicated significantly positive correlations with water temperature, % sand and river kilometer, and negative correlations with bank slope and sedimentary organic material. Clams occurring upstream of Bonneville Dam exhibited greater weight-at-length than those occurring downstream. Our investigation represents the greatest spatial extent at which C. fluminea has been studied in the CR and our results provide a better understanding of the basic biology and ecology of this global invader, as well as providing natural resource managers with information on habitat conditions favorable for this invasive bivalve within temperate river ecosystems.
Download or read book Feeding Rates and Prey Selection by the Invasive Asian Clam Corbicula Fluminea on Microplankton in the Columbia River North America written by Benjamin A. Bolam 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 Broadscale Distribution Abundance and Ecological Associations of Veligers of the Invasive Asian Clam Corbicula Fluminea in the Columbia River Basin written by Whitney Paige Hassett and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Variation in Cold Tolerance Among Populations of the Invasive Asian Clam Corbicula Fluminea written by Emilija Cvetanovska and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The Asian Clam Corbicula fluminea is one of the most invasive freshwater molluscs in the world. In north temperate regions, this subtropical species is typically restricted to artificially heated waterbodies. Its distribution has long been believed to be constrained by a lower temperature tolerance limit of 2°C, based on a frequently-cited study of a single southern population. However, overwintering populations have been discovered in some lakes and rivers in northeastern North America in recent years. I explored the hypothesis that cold tolerance of C. fluminea varies across its invaded range, by using a series of experiments on clams from six geographically distinct populations along a latitudinal gradient in eastern North America. These experiments revealed that C. fluminea can tolerate prolonged exposure to near freezing conditions and that survivorship differs across populations. Each population contained individuals that survived two months at ~0.5-1°C. Survivorship of individuals across all populations was significantly enhanced by prior acclimation to a low temperature (10°C) compared to a higher one (18°C). When acclimated to 10°C, clams from northern populations showed greater survivorship (55.0± 16.1%) than those from southern populations (26.7± 19.2%), but no difference was observed at 18°C. At both acclimation temperatures, larger clams had a higher survivorship than smaller clams. I hypothesize that physiological plasticity and acclimation history accounts for variation in cold tolerance across these populations. The results highlight the need for risk assessments of invasive species to incorporate physiological data from multiple populations, as predictions derived from single populations could be erroneous. However, a literature search of experimental studies on environmental tolerances of aquatic invasive animals found that only 8% of these studies compared at least two or more distinct populations of a given species. Similarly, a specific search that focused on the 20 aquatic invasive animals considered among the "world's worst" invaders found that only
Download or read book Growth of the Juvenile Freshwater Asiatic Clam Corbicula Fluminea as an Indicator of Sublethal Stress in a Small California Stream written by James Daniel Tull and published by . This book was released on 1989 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Factors Affecting the Distribution Abundance and Condition of an Invasive Freshwater Bivalve in a Thermal Plume written by Rowshyra Castaneda and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The Asian clam, Corbicula fluminea, is a freshwater bivalve that has recently invaded artificially heated waters downstream of the Gentilly-2 nuclear power plant in the St. Lawrence River. C. fluminea is one of the world's most invasive molluscs, owing to its ability to rapidly establish dense populations in new areas. Its physiological requirements have apparently restricted its global distribution to waterbodies whose temperatures remain above 2oC throughout the year; however, recent invasions suggest that the clam may be adapting to lower temperatures. Using published data, I have identified patterns of the distribution and population densities of C. fluminea in artificially heated and natural (non-heated) waterbodies. Densities of C. fluminea populations do not differ between artificially heated and non-heated waters, but exhibit a positive trend with latitudinal distance such that peak densities occur in middle latitudes. The occurrence of C. fluminea in United States rivers below 40oN is positively correlated with human population density. At local scales within the St. Lawrence River, temperature, flow velocity, turbidity and depth were identified as factors that affect the distribution and density of C. fluminea. Furthermore, the clam was restricted to sites within the thermal plume of the Gentilly-2 power plant, and its body condition and reproductive status varied in time and space. The presence of C. fluminea in St. Lawrence River raises the question of whether the species can use the thermal plume to adapt to colder conditions and spread further in the river, especially as warming trends continue." --
Download or read book Population Characteristics and Habitat Use by the Recently Introduced Asiatic Clam Corbicula Fluminea in Lake Whatcom Washington written by Jason Alexander Buehler and published by . This book was released on 2017 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Asiatic Clam (Corbicula fluminea) was found in Lake Whatcom in 2011. This exotic clam is common throughout North America and is spread between watersheds by infested boats, fishing activities, as well as passively by waterfowl. Corbicula fluminea is a well documented invasive species that survives in many environments and exhibits an r-selected life history which can lead to potentially rapid population growth via a clonal reproductive ability typical among invasive bivalves and members of the family Corbiculidae. There are more reproductive strategies in Corbiculidae than any other freshwater bivalve. This rapid growth of a single organism and its associated consumption and excretions can lead to undesired changes in an aquatic ecosystem. Studies have shown a drop in species richness, alterations to algal communities and their availability to other organisms, and water quality changes associated with burrowing, shell accumulation, and clam decomposition. My research included an assessment of the growth of representative Lake Whatcom clam populations during 2012 and 2013 using shellfish surveying methods that have been applied to the marine intertidal environment. Surveying was based on multiple transects with randomly sampled 0.25-square meter quadrats. Three sites were identified that had populations of the clam and were accessible for surveys. These sites were Bloedel Donovan Park in the City of Bellingham, Lakewood, a facility run by Western Washington University, and a small park beach within the community of Sudden Valley. Surveys showed sample areas with 200 or more individual clams per square meter at all three sites. Studies state this density to be indicative of a self-sustaining population for C. fluminea. Some sites exhibited an increase in biomass and size from 2012 to 2013. All sites showed significant changes among some size classes that suggest growth. The sand and fine sediment substrate of the Sudden Valley site hosted significant density increases and biomass increases from 2012 to 2013. The harder rocky substrate of Lakewood hosted multiple size classes but did not show evidence of growth. Bloedel Donovan Park differed from the other sites in that it had a small size class in 2013 that was not present in 2012 suggesting a new generation of clams had reseeded the habitat. The overall environment within Lake Whatcom does not appear to be conducive to extended periods of reproduction based on the presence of distinct size classes. Distinct size classes are representative of specific reproductive windows during the year made available during the warmer months of summer. Density and biomass changed with depth within the nearshore shallows suggesting that the cooler deeper waters of the lake are not as suitable to the clam as the warmer, shallower areas within the littoral zone. Another explanation is less phytoplankton availability due to light limitations imposed by depth. Corbicula fluminea appears to be reproducing to varying degrees at all three sites in this study, and it will likely continue to spread to suitable habitat within Lake Whatcom. Typical impacts associated with the clam should be expected. These include changes in species richness, especially changes in native filter feeder concentration as well as changes to phytoplankton density, and alterations to the seston nutrient load because of burrowing and biological functions associated with C. fluminea
Download or read book Effects of the Invasive Asian Clam Corbicula Fluminea on the Littoral Communities of Lake Constance written by Stefan Werner and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Using Caged Clams to Monitor Contaminated Groundwater Exposure in the Near Shore Environment of the Hanford Site 300 Area written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Asiatic clam (Corbicula fluminea) has been identified as an indicator species for locating and monitoring contaminated groundwater in the Columbia River. Pacific Northwest National Laboratory conducted a field study to explore the use of caged Asiatic clams to monitor contaminated groundwater upwelling in the 300 Area near-shore environment and assess seasonal differences in uranium uptake in relation to seasonal flow regimes of the Columbia River. Additional objectives included examining the potential effects of uranium accumulation on growth, survival, and tissue condition of the clams. This report documents the field conditions and procedures, laboratory procedures, and statistical analyses used in collecting samples and processing the data. Detailed results are presented and illustrated, followed by a discussion comparing uranium concentrations in Asiatic clams collected at the 300 Area and describing the relationship between river discharge, groundwater indicators, and uranium in clams. Growth and survival, histology, and other sources of environmental variation also are discussed.
Download or read book SAMMELBAND VADIANA VMISC QA 2 written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Population Dynamics Growth and Reproduction of the Invasive Clam Corbicula Fluminea Mollusca Bivalvia in East Texas written by Andrei Igorevitch Nesterovitch and published by . This book was released on 2003 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Northern Range Extension of the Invasive Bivalve Corbicula Fluminea written by Andrea Morden and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The Asian clam Corbicula fluminea - one of the world's most invasive freshwater species - was previously believed to be limited to warm temperate habitats, but has extended its North American range northward into cold temperate waters in recent years. Using lab experiments, I show that C. fluminea tolerance to low oxygen varies across populations; therefore, risk assessments that are based on environmental tolerance data derived from only a single population are unreliable. Using climate suitability modeling techniques, I identify regions in North America at risk of C. fluminea invasion under current and future climate conditions. Finally, I experimentally quantify variation in shell degradation rates across different habitat conditions, to evaluate the feasibility of using spent shells as an indicator of establishment success. These results highlight the importance of accounting for phenotypic variation and context dependence when identifying ecosystems at risk of invasion. " --
Download or read book Invasive Clams in Lake Tahoe written by Marianne Denton and published by . This book was released on 2011 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: Invasive species are of concern to ecologists and resource managers due to the growing ecological and economic impacts associated with their introduction. In North America, invasive species cause significant environmental impacts with costs estimates of $137 billion annually. Second to loss of habitat, invasive species have been linked to the declines in biodiversity on a global scale. Once established, invasive species have been shown to alter community and ecosystem dynamics, change habitat for native species, interrupt energy flow through food webs, and reduce ecosystem services. Among non-native aquatic species, invasive bivalves can cause significant impacts by altering the availability of resources, contributing to the extirpation of native species, declines in diversity and impairment of ecosystem functioning. They are able to tolerate a wide range of environmental conditions (temperature, water chemistry, substrate, etc.), allowing them to acclimatize to a new environments, making them adaptable to exploit ecological niches. In the last century, Corbicula fluminea (Asian clam) has been one of the more successful invasive bivalves to establish in aquatic ecosystems. C. fluminea is an invasive freshwater bivalve to North American that originally established in Pacific Northwest in 1938 from Southeast Asia, and has since been documented in 42 states. The shells of dead C. fluminea may provide refuge and substrate for the establishment of benthic larval insect communities and live clams may influence benthic communities by processes of bioturbation of sediment via burrowing and biodeposition of organic matter as feces and pseudofeces. Through highly efficient suspension-feeding and deposit- feeding on sediment organic matter, C. fluminea may also couple the pelagic and benthic food webs. The vectors of invasion are live bait buckets however the release of aquarium stock and transport via boat bilge is possible. Recently there has been an invasion of C. fluminea in Lake Tahoe, a large, deep subalpine lake located in the central Sierra Nevada of California and Nevada. Very little is known about the life history or impacts of clams on the ecology of the lake; however, preliminary research suggests they may linked to increased nearshore algal blooms. The chapters included here examine the reproductive strategies (Chapter 1) and impacts to native benthic community structure (Chapter 2) by C. fluminea in Lake Tahoe. In Chapter 1, it was determined that C. fluminea in Lake Tahoe had a low reproductive effort with a single spawn that occurred in late summer that is likely linked to the temperature and low food availability. Moreover, deeper water populations of clams are likely populations sinks dues due to the cold temperatures. Chapter 2 shows how C. fluminea changes benthic community structure depending on the level of infestation. It was determined that three taxa had greater abundances where abundances of C. fluminea are low. In areas with greater abundance, C. fluminea facilitate two taxa, Chironomidae and Trichoptera. While the mechanisms were not studied, the shells of clams may provide structure and thus habitat for certain invertebrates. Other mechanisms of facilitation such as competition or providing increased food supply through the release of pseudofeces may also impact community structure. Other behavioral experiments and raw data not formally presented in chapter form are presented in the Appendix. As the establishment of C. fluminea is still in an early stage of invasion, future studies and monitoring will be essential to further determine how the clam impacts Lake Tahoe's ecosystem.
Download or read book A Multidisciplinary Study of the Asiatic Clam Corbicula Fluminea from the New River Virginia written by Francis G. Doherty and published by . This book was released on 1986 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Handbook of Global Freshwater Invasive Species written by Robert A. Francis and published by Routledge. This book was released on 2012-03-12 with total page 918 pages. Available in PDF, EPUB and Kindle. Book excerpt: Invasive non-native species are a major threat to global biodiversity. Often introduced accidentally through international travel or trade, they invade and colonize new habitats, often with devastating consequences for the local flora and fauna. Their environmental impacts can range from damage to resource production (e.g. agriculture and forestry) and infrastructure (e.g. buildings, road and water supply), to human health. They consequently can have major economic impacts. It is a priority to prevent their introduction and spread, as well as to control them. Freshwater ecosystems are particularly at risk from invasions and are landscape corridors that facilitate the spread of invasives. This book reviews the current state of knowledge of the most notable global invasive freshwater species or groups, based on their severity of economic impact, geographic distribution outside of their native range, extent of research, and recognition of the ecological severity of the impact of the species by the IUCN. As well as some of the very well-known species, the book also covers some invasives that are emerging as serious threats. Examples covered include a range of aquatic and riparian plants, insects, molluscs, crustacea, fish, amphibians, reptiles and mammals, as well as some major pathogens of aquatic organisms. The book also includes overview chapters synthesizing the ecological impact of invasive species in fresh water and summarizing practical implications for the management of rivers and other freshwater habitats.
Download or read book Growth Reproduction and Thermal Tolerance of the Asiatic Clam Corbicula Fluminea in a Northern Temperate Habitat written by Patricia A. White and published by . This book was released on 1985 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
