The Ecological History of Silver Lake, Logan County, Ohio, Through Diatom Analysis of a Sediment Core PDF Download
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Author: Cathy Lee Weiss
Publisher:
ISBN:
Category : Ecology
Languages : en
Pages : 174
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Author: Cathy Lee Weiss
Publisher:
ISBN:
Category : Ecology
Languages : en
Pages : 174
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Author: Cathy Lee Weiss
Publisher:
ISBN:
Category : Diatoms
Languages : en
Pages : 108
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Author: Kelly A. Shaw
Publisher:
ISBN:
Category : Eutrophication
Languages : en
Pages : 164
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The increase in human population and human activities often negatively impacts the quality of our waters. Lake sediment often preserves a record of past anthropogenic activities and can be used to assess the impact of humans on the lake system. This study examines Silver Lake, a groundwater-fed kettle lake located in the Village of Silver Lake, Summit County, Ohio. Surface samples and water column profiles were collected to assess present-day conditions because the health of the lake is of concern to the local residents. The lake is eutrophic, with an anoxic hypolimnion during the summer months that allows phosphorus to be released from the sediment. Since 1982 lake transparency has been decreasing as evidenced by a shallowing in Secchi depth reading. Silver Lake contains two basins, and sediment cores were collected from both basins to assess longterm changes in the lake. The sediment in both basins displayed similar trends. Below 163.5 centimeters below lake floor core depth, a dark green-brown, organic-rich gyttja with relatively high C/N ratio is interpreted to represent forested watershed conditions prior to the arrival of New Englanders in 1804. The decline in sediment organic content and corresponding increase in bulk density at 125 cmblf likely reflects the impact of land clearance within the watershed following settlement. Between 79 -117.5 cmblf, a black mud having an oily odor and low organic content is present. This black mud has pronounced increases in trace metals, ferrimagnetic content, combustion particles, and bulk density, and likely was deposited between 1874 and 1918 when a major amusement park, complete with steamboat rides, occupied the western shore of the lake. This period is also inferred to contain the 1913 flood shown by an increase in Cr content. When the park closed in 1918, the land was converted into suburban housing and by the mid-late 20th century the entire watershed was occupied by suburban housing. The brown mud above 79 cmblf core depth displays decreasing trends in ferrimagnetic content, tracemetal content, and combustion particles, reflecting changes in anthropogenic activities during the mid- to late 20th century. Study of the lake sediment allows the impacts of humans on the Silver Lake system to be assessed and the present-day conditions to be placed in a long-term context.
Author: Ohio State University. Lake Erie Program
Publisher:
ISBN:
Category : Freshwater biology
Languages : en
Pages : 142
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Author: Ronald A. Van Blarcum
Publisher:
ISBN:
Category :
Languages : en
Pages : 55
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Abstract: Sediment core archives provide a history of data useful for serving as a long-term monitoring reserve to evaluate chronological events of contamination to lake systems. This could be an effective tool for continual environmental management, monitoring and potential restoration efforts. This method is also very cost-effective without the addition of a water quality monitoring station on site. Taking 3 sediment cores from Punderson Lake Ohio for analysis has allowed associating variations in select metals to anthropogenic events or activities; we can determine a time frame with limited uncertainty and resolve the intensity of anthropogenic contamination to the lake starting with post World War II contamination till the present. We used sedimentation rate in conjunction with radiometric dating methods of 137Cs to establish a timeline through the cores. Applying mass depth g/cm2 (Matisoff and Whiting, 2011) and core segmentation intervals (1cm) we can remove issue of porosity and compaction. Selected trace elements (As, Cu, Mn and Pb) were studied in these sediment cores. We can parse natural crustal sources of sediment input from anthropogenic sources using a method known as enrichment factor (EF) (Feng et al., 2004). This method requires the normalization of trace metal concentration against Al into an index/dimensionless data form (Essien et al. 2009). EF index implies a severity of contamination in a sediment interval allowing for the consideration of environmental impact, status of pollution and possibly source the contamination of the select trace metal. We can then plot EF over time to obtain relative burial times of the excess trace metals. We can then make a comparison to other regional lakes to see how anthropogenic source contamination appears in other systems. We used diatoms as a biological component as they are sensitive to ecosystem/environmental changes and preserve well in buried sediment. Therefore; diatoms can be seen as responding to possible human influences that are changing the habitat or quality of the lake. We found correlations within the core showing trace element pollution related to anthropogenic activities. Primarily we can see strong signals of Pb and As in earlier portions of the core indicative of industrialization and fossil fuel burning of the time. We also see a rise in Cu enrichment at the top of the core which, is linked to CuSO4 additions to the lake. Diatoms confirm that the CuSO4 is having an impact on biotic components of the lake particularly changing their community structures. It is important to consider the benefits of this type of study. Future benefits such as building and periodically updating a data base that can be used to track a lake systems contamination levels and provide invaluable insight into remediation and site maintenance efforts.
Author:
Publisher:
ISBN:
Category : Hydrology
Languages : en
Pages : 954
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Author:
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 192
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Author:
Publisher:
ISBN:
Category : Water
Languages : en
Pages : 984
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Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 792
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Author:
Publisher:
ISBN:
Category : Freshwater biology
Languages : en
Pages : 980
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