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Macroalgal nutrient dynamics in Upper Newport Bay estuary, CA
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Pp. 118-118 in Total Maximum Daily Load (TMDL) Environmental Regulations–II Proceedings of the 8-12 November 2003 Conference (Albuquerque, New Mexico USA), Publication Date 8 November 2003. .(doi:10.13031/2013.15545)
Authors: Krista Kamer, Peggy Fong
Keywords: Estuary, macroalgae, nutrients, Enteromorpha intestinalis, Ulva expansa, TMDL, nitrogen, phosphorus, southern California
Upper Newport Bay estuary, Orange County, California, US, was added to the Clean Water Act
303(d) list for nutrients, due in part to the excessive growth of macroalgae during certain
seasons. In 1998, a Total Maximum Daily Load for nitrogen and phosphorus was adopted for
San Diego Creek, the largest tributary to the estuary. As part of the implementation of the
TMDL, the N and P water quality objectives were evaluated. Insufficient data were available to
determine whether they were appropriate; therefore, mechanistic studies investigating the
processes in UNB that control macroalgal biomass were needed. We 1) investigated the
contribution of nutrients from estuarine sediments to macroalgal growth and tissue nutrient
content; 2) determined if N or P is the nutrient most limiting to macroalgae; 3) measured rates of
N and P uptake by Enteromorpha intestinalis and Ulva expansa, the dominant, green, bloomforming
macroalgal species; and 4) investigated the effect!