Download or read book Development of a Habitat Suitability Index for the Eastern Oyster Crassostrea Virginica in Great Wicomico River Virginia written by Seth Joseph Theuerkauf and published by . This book was released on 2012 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: The eastern oyster, Crassostrea virginica, provides critical ecological functions to Chesapeake Bay. Unfortunately, as a result of overharvesting, disease, and poor water quality, the native oyster population of the Bay currently stands at less than 1% of its historic size. Within the Great Wicomico River, a tributary of the Bay, the United States Army Corps of Engineers (USACE) Norfolk District has successfully restored approximately 85 acres of "no take" sanctuary oyster reef. This study developed a habitat suitability index (HSI) for the eastern oyster in the Great Wicomico River in order to identify areas of suitable oyster habitat. The model was validated using live adult oyster density data derived from the 2011 VIMS monitoring survey of the USACE restored reefs. The results from this model can be used to inform the rehabilitation of the existing sanctuary oyster reef network and the construction of additional oyster reef in the Great Wicomico River.
Download or read book Habitat Suitability Index Models written by Edwin W. Cake and published by . This book was released on 1983 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Habitat Suitability Index for the Eastern Oyster Crassostrea Virginica in the Chesapeake Bay written by Timothy Adams Battista and published by . This book was released on 1999 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Cost effectiveness Analysis of Crassostrea Virginica Restoration as a Possible Nutrient Reducing Method Within Chesapeake Bay A Study of the Great Wicomico River Virginia written by Amanda Ann Wenczel and published by . This book was released on 2007 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Chesapeake Bay is currently on the verge of an ecological crisis. Most of the Bay and tributary waters are considered impaired, flora and fauna populations are at all time lows, and there does not appear to be a significant solution in the near future. Over the years, there have been a number of attempts at improving water quality, most notably through wastewater treatment upgrades and changes in agricultural practices. Although these programs have been in place for years, there has been little effect, leading to the increased demand for new initiatives in this field. Additionally, all time low population levels have been recorded for Crassostrea virginica (the eastern oyster), a culturally, economically, and ecologically significant species for the Bay-region. Based on the need to increase both water quality and oyster populations, researchers have proposed a new initiative: the use of oysters' natural ability of filtration to reduce local levels of nutrients. Thus far, research related to this innovative idea has focused on filtration rates and the survivability of restored oyster populations. This thesis attempts to expand upon the current research by conducting a cost-effectiveness analysis on the costs associated with an oyster restoration project in the Great Wicomico River, Virginia as they relate to the amount of nutrients removed by the restored population. The goal of this analysis is to provide a comparison between the unit cost of removing one pound of a nutrient through oyster filtration versus that of the current or proposed alternatives. Based on the preliminary analysis and a Monte Carlo Sensitivity Analysis to account for variability, it was found that oyster restoration projects are not cost-effective solutions to reducing nutrients within Chesapeake Bay. The current alternatives can remove one pound of nitrogen at a cost of between $1.57/lb and $8.56/lb, while according to the Monte Carlo analysis, the oyster restoration project would cost roughly $77.77/lb of nitrogen removed. The results are similar in proportion with phosphorus removal. Overall, this thesis found that oyster filtration is not a cost-effective solution to removing nutrients from Chesapeake Bay, with the recommendation that current alternatives continue until a less-costly method is devised.
Download or read book Reef Development and Condition Indices of the Eastern Oyster Crassostrea Virginica in Relation to Background Water Quality in Three Tidal Creeks in Southeastern North Carolina written by Anne Lyons Markwith and published by . This book was released on 2006 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Eastern Oyster Crassostrea Virginica Growth and Epifaunal Community Development on Bars of Varying Oyster Density in Chesapeake Bay written by Charles Stewart Harris and published by . This book was released on 2003 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Setting and First Season Survival of the American Oyster Crassostrea Virginica Near Oxford Maryland 1961 62 written by John Robert Webster and published by . This book was released on 1968 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Potential Impacts of Reduced Freshwater Inflow on Apalachicola Bay FL Oyster Crassostrea Virginica Populations written by and published by . This book was released on 1998 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cumulative Risks to Eastern Oysters Crassostrea Virginica in the James River Virginia written by Vrushali K. Lele and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In an effort to apply Cumulative Risk Assessment (CRA) as developed by the U.S. EPA, the present study investigates the cumulative risks to Eastern oysters due to multiple stressors such as salinity, temperature and oxygen and carbon dioxide. I also compared the effectiveness of the Hazard Quotient Method (HQ) in CRA. Ambient conditions in the James River, VA were obtained from the Virginia DEQ database and respiratory responses were estimated using values from the literature. The multiple environmental stresses are evaluated using a probabilistic analysis that combines the environmental conditions. It was concluded that salinity was the most influential stressor in the model. Other risks were identified contributing to the vulnerability of the oysters. Crystal Ball simulations yielded that the oxygen uptake of oysters reduced by more than 29%. The HQ method was found to be inappropriate in analyzing cumulative risks for CRA. Oyster populations are dramatically declining in the James River and the Chesapeake Bay. Hence, effective oyster restoration activities are underway to rebuild oyster populations in the James River and throughout the Bay area.
Download or read book Geospatial Analysis of Eastern Oyster Habitat and Disease in the Chesapeake Bay written by and published by . This book was released on 2018 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt: Crassostrea virginica, common name eastern oyster, in the Chesapeake Bay is currently at 1% of its peak annual landings in 1884 (600,000 metric tons). This decline is in spite of being considered a resilient species. Causes of the decline include overharvesting, disease, and habitat loss. While efforts have been made to combat each cause, the key element to recovering the population is coordinated habitat restoration. This study aims to develop a GIS-based habitat model for the eastern oyster in the Chesapeake Bay. The first goal of this study was to determine the water quality parameters necessary for successful oyster population restoration and to locate where those conditions exist concurrently. To identify these areas that are most suitable for restoration efforts, a habitat analysis was performed using GIS data of water quality parameters in the bay consisting of water temperature, salinity, dissolved oxygen, pH, and bathymetry. Data obtained from monitoring stations throughout the bay were used to estimate the water quality parameters. Those parameters were interpolated using inverse distance weighting to create continuous rasters of seasonal averages for each parameter. Then rasters were combined and analyzed using geospatial processing to determine the areas that contain the most favorable conditions for oyster growth at both larval and adult life stages. Additionally, the conditions for proliferation of oyster diseases MSX and Dermo were assessed geospatially. The second goal of this study was to determine the potential changes to suitable oyster habitat area and Dermo proliferation following the climate change experts' prediction of a 2°C water temperature increase. Resulting models showed a decrease in total area of high quality habitat for larval and adult models with the 2°C increase, as compared to the current condition models. Disease proliferation of Dermo also exhibited increases in higher risk areas in the 2°C increase model when compared to the current condition model.
Download or read book Growth of Eastern Oyster Crassostrea Virginica in Chesapeake Bay written by Jessica Marie Coakley and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Status of Virginia s Public Oyster Resource 2019 written by Melissa J. Southworth and published by . This book was released on 2020 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Virginia Institute of Marine Science (VIMS) monitors recruitment of the Eastern oyster, Crassostrea virginica (Gmelin, 1791), annually from late spring through early fall, by deploying spatfall1 (settlement and recruitment of larval oysters to the post metamorphic form termed spat) collectors (shellstrings) at various sites in three Virginia western Chesapeake Bay tributaries. The survey provides an estimate of a particular area's potential for receiving a "strike" or settlement (set) of oysters on the bottom and helps describe the timing of recruitment events in a given year. Information obtained from this monitoring effort provides an overview of long-term recruitment trends in the lower Chesapeake Bay and contributes to the assessment of the current oyster resource condition and the general health of the Bay. These data are also valuable to parties on both the public side (Virginia Marine Resources Commission (VMRC), Shellfish Replenishment Division) and private industry who are interested in potential timing and location of shell plantings in order to optimize recruitment of spat on bottom cultch (shell that is available for larvae to settle on). Results from spatfall monitoring reflect the abundance of ready-to-settle oyster larvae in an area, and thus, provide an index of oyster population reproduction as well as development and survival of larvae to the settlement stage in an estuary. Environmental factors affecting these physiological activities may cause seasonal and annual fluctuations in spatfall, which are evident in the data. Data from spatfall monitoring also serve as an indicator of potential oyster recruitment into a particular estuary. Survival of spat on bottom cultch is affected by many factors, including physical and chemical environmental conditions, the physiological condition of the larvae when they settle, predators, disease, and the timing of these various factors. Abundance and condition of bottom cultch also affects the settlement process and survival of spat on the bottom. Therefore, spatfall on shellstrings may not directly correspond with recruitment on bottom cultch at all times or places. This report summarizes data collected during the 2019 settlement season in three tributaries in the Virginia portion of the Chesapeake Bay.
Download or read book Growth and Mortality of the Eastern Oyster Crassostrea Virginica in the Patuxent River written by Amy Corker Freise and published by . This book was released on 1996 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Occurrence in Virginia of Green gilled Oysters Similar to Those of Marennes written by Philip Henry Mitchell and published by . This book was released on 1927 with total page 708 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nonnative Oysters in the Chesapeake Bay written by National Research Council and published by National Academies Press. This book was released on 2004-03-09 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nonnative Oysters in the Chesapeake Bay discusses the proposed plan to offset the dramatic decline in the bay's native oysters by introducing disease-resistant reproductive Suminoe oysters from Asia. It suggests this move should be delayed until more is known about the environmental risks, even though carefully regulated cultivation of sterile Asian oysters in contained areas could help the local industry and researchers. It is also noted that even though these oysters eat the excess algae caused by pollution, it could take decades before there are enough of them to improve water quality.
Download or read book A Survey of Oyster Resources at Glebe Point in the Great Wicomico River written by Robert A. Blaylock and published by . This book was released on 1990 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This survey of oyster resources associated with leased oyster bottom in the Great Wicomico River in the vicinity of Glebe Point (State Rt. 200) was undertaken by the Virginia Institute of Marine Science (VIMS) at the request of the Virginia Department of Transportation (VDOT). The study was designed specifically to assess the present and potential value of the two oyster leases adjacent to the bridge crossing the Great Wicomico River at Glebe Point.
Download or read book Recruitment and Growth of the Eastern Oyster Crassostrea Virginica in North Carolina written by Sonia Ortega and published by . This book was released on 1991 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
