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Scientific Bases for Numerical Chlorophyll Criteria in Chesapeake Bay

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dc.contributor.author Harding, L. W., J. en
dc.contributor.author Batiuk, R. A. en
dc.contributor.author Fisher, T. R. en
dc.contributor.author Gallegos, Charles L. en
dc.contributor.author Malone, T. C. en
dc.contributor.author Miller, W. D. en
dc.contributor.author Mulholland, M. R. en
dc.contributor.author Paerl, H. W. en
dc.contributor.author Perry, E. S. en
dc.contributor.author Tango, P. en
dc.date.accessioned 2014-02-04T18:14:16Z
dc.date.available 2014-02-04T18:14:16Z
dc.date.issued 2014
dc.identifier.citation Harding, L. W., J., Batiuk, R. A., Fisher, T. R., Gallegos, Charles L., Malone, T. C., Miller, W. D., Mulholland, M. R., Paerl, H. W., Perry, E. S., and Tango, P. 2014. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F21781">Scientific Bases for Numerical Chlorophyll Criteria in Chesapeake Bay</a>." <em>Estuaries and Coasts</em>. 37 (1):134&ndash;148. <a href="https://doi.org/10.1007/s12237-013-9656-6">https://doi.org/10.1007/s12237-013-9656-6</a> en
dc.identifier.issn 1559-2723
dc.identifier.uri http://hdl.handle.net/10088/21781
dc.description.abstract In coastal ecosystems with long flushing times (weeks to months) relative to phytoplankton growth rates (hours to days), chlorophyll a (chl-a) integrates nutrient loading, making it a pivotal indicator with broad implications for ecosystem function and water-quality management. However, numerical chl-a criteria that capture the linkage between chl-a and ecosystem impairments associated with eutrophication (e.g., hypoxia, water clarity and loss of submerged aquatic vegetation, toxic algal blooms) have seldom been developed despite the vulnerability of these ecosystems to anthropogenic nutrient loading. Increases in fertilizer use, animal wastes, and population growth in the Chesapeake Bay watershed since World War II have led to increases in nutrient loading and chl-a. We describe the development of numerical chl-a criteria based on long-term research and monitoring of the bay. Baseline chl-a concentrations were derived using statistical models for historical data from the 1960s and 1970s, including terms to account for the effects of climate variability. This approach produced numerical chl-a criteria presented as geometric means and 90th percentile thresholds to be used as goals and compliance limits, respectively. We present scientific bases for these criteria that consider specific ecosystem impairments linked to increased chl-a, including low dissolved oxygen (DO), reduced water clarity, and toxic algal blooms. These multiple lines of evidence support numerical chl-a criteria consisting of seasonal mean chl-a across salinity zones ranging from 1.4 to 15 mg m-3 as restoration goals and corresponding thresholds ranging from 4.3 to 45 mg m-3 as compliance limits. Attainment of these goals and limits for chl-a is a precondition for attaining desired levels of DO, water clarity, and toxic phytoplankton prior to rapid human expansion in the watershed and associated increases of nutrient loading. en
dc.relation.ispartof Estuaries and Coasts en
dc.title Scientific Bases for Numerical Chlorophyll Criteria in Chesapeake Bay en
dc.type Journal Article en
dc.identifier.srbnumber 116370
dc.identifier.doi 10.1007/s12237-013-9656-6
rft.jtitle Estuaries and Coasts
rft.volume 37
rft.issue 1
rft.spage 134
rft.epage 148
dc.description.SIUnit SERC en
dc.description.SIUnit Peer-reviewed en
dc.citation.spage 134
dc.citation.epage 148

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