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Eastern oyster (Crassostrea virginica) [delta]15N as a bioindicator of nitrogen sources: Observations and modeling (Page 1)

Eastern oyster (Crassostrea virginica) [delta]15N as a bioindicator of nitrogen sources: Observations and modeling

Fertig BM, Carruthers TJB, Dennison WC, Fertig EJ, and Altabet MA ·
2010

Stable nitrogen isotopes ([delta]15N) in bioindicators are increasingly employed to identify nitrogen sources in many ecosystems and biological characteristics of the eastern oyster (Crassostrea virginica) make it an appropriate species for this purpose. To assess nitrogen isotopic fractionation associated with assimilation and baseline variations in oyster mantle, gill, and muscle tissue [delta]15N, manipulative fieldwork in Chesapeake Bay and corresponding modeling exercises were conducted.

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Improvements to Shellfish Harvest Area Closure Decision Making Using GIS, Remote Sensing, and Predictive Models (Page 1)

Improvements to Shellfish Harvest Area Closure Decision Making Using GIS, Remote Sensing, and Predictive Models

Kelsey RH, Scott GI, Porter DE, Siewicki TC, and Edwards DG ·
2010

Currently, many states use precipitation information to regulate periodic closures of shellfish harvest areas based on a presumptive relationship between rainfall and bacteria concentration. We evaluate this relationship in four South Carolina estuaries and suggest new predictive models that integrate remote sensing precipitation data with additional environmental and climatic data.

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Influence of wetland networks on bat activity in mixed-use landscapes

Lookingbill TR, Elmore AJ, Engelhardt KAM, Churchill JB, Gates JE, and Johnson JB ·
2010

Parks and other protected lands can provide important source habitat and act as valuable dispersal corridors in urbanizing environments. However, most wetlands within protected areas are managed in isolation without consideration of the broader landscape connections. We studied the importance of wetland habitat connectivity and landscape context to bat activity in five National Parks along a gradient of increasing urbanization within the Mid-Atlantic United States.

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Integrating and Applying Science: A practical handbook for effective coastal ecosystem assessment

Longstaff BJ, Carruthers TJB, Dennison WC, Lookingbill TR, Hawkey JM, Thomas JE, Wicks EC, and Woerner JL (eds) ·
2010

Vast areas of the globe's coastal zone have experienced significant declines in ecosystem health. Deteriorating water quality, loss and alteration of vital habitats, and reduced populations of fish and shellfish are some of the major changes recorded. Regardless of the differences between cultures, climate regions, and population pressures, integrated management and assessment is required to solve coastal environmental problems.

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Long-Term Trends in Submersed Aquatic Vegetation (SAV) in Chesapeake Bay, USA, Related to Water Quality (Page 1)

Long-Term Trends in Submersed Aquatic Vegetation (SAV) in Chesapeake Bay, USA, Related to Water Quality

Orth RJ, Williams MR, Marion SR, Wilcox DJ, Carruthers TJB, Moore KA, Kemp WM, Dennison WC, Rybicki N, Bergstrom P, and Batiuk RA ·
2010

Chesapeake Bay supports a diverse assemblage of marine and freshwater species of submersed aquatic vegetation (SAV) whose broad distributions are generally constrained by salinity. An annual aerial SAV monitoring program and a bi-monthly to monthly water quality monitoring program have been conducted throughout Chesapeake Bay since 1984. We performed an analysis of SAV abundance and up to 22 environmental variables potentially influencing SAV growth and abundance (1984-2006).

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Long-Term Trends of Water Quality and Biotic Metrics in Chesapeake Bay: 1986 to 2008 (Page 1)

Long-Term Trends of Water Quality and Biotic Metrics in Chesapeake Bay: 1986 to 2008

Williams MR, Filoso S, Longstaff BJ, and Dennison WC ·
2010

We analyzed trends in a 23-year period of water quality and biotic data for Chesapeake Bay. Indicators were used to detect trends of improving and worsening environmental health in 15 regions and 70 segments of the bay and to assess the estuarine ecosystem's responses to reduced nutrient loading from point (i.e., sewage treatment facilities) and nonpoint (e.g., agricultural and urban land use) sources.

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Altered ecological flows blur boundaries in urbanizing watersheds (Page 1)

Altered ecological flows blur boundaries in urbanizing watersheds

Lookingbill TR, Kaushal SS, Elmore AJ, Gardner R, Eshleman KN, Hilderbrand RH, Morgan RP, Boynton WR, Palmer MA, and Dennison WC ·
2009

The relevance of the boundary concept to ecological processes has been recently questioned. Humans in the post-industrial era have created novel lateral transport fluxes that have not been sufficiently considered in watershed studies. We describe patterns of land-use change within the Potomac River basin and demonstrate how these changes have blurred traditional ecosystem boundaries by increasing the movement of people, materials, and energy into and within the basin.

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Development and evaluation of a spatially-explicit index of Chesapeake Bay health (Page 1)

Development and evaluation of a spatially-explicit index of Chesapeake Bay health

Williams MR, Longstaff BJ, Buchanan C, Llanso R, Dennison WC ·
2009

In an effort to better portray changing health conditions in Chesapeake Bay and support restoration efforts, a Bay Health Index (BHI) was developed to assess the ecological effects of nutrient and sediment loading on 15 regions of the estuary. Three water quality and three biological measures were combined to formulate the BHI.

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Global patterns of foliar nitrogen isotopes and their relationships with climate, mycorrhizal fungi, foliar nutrient concentrations, and nitrogen availability

Craine JM, Elmore AJ, Aidar MPM, Bustamante M, Dawson TE, Hobbie EA, Kahmen A, Mack MC, McLauchlan KK, Michelsen A, Nardoto GB, Pardo LH, Penuelas J, Reich PB, Schuur EAG, Stock WD, Templer PH, Virginia RA, Welker JM, and Wright IJ ·
2009

Ratios of nitrogen (N) isotopes in leaves could elucidate underlying patterns of N cycling across ecological gradients. To better understand global-scale patterns of N cycling, we compiled data on foliar N isotope ratios (delta N-15), foliar N concentrations, mycorrhizal type and climate for over 11 000 plants worldwide.

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