Abstract
Although marine lagoons are ubiquitous features along coastal margins, studies investigating the dynamics of metal, organic matter, and nutrient concentrations in such systems are rare. Here we present a comprehensive examination of the temporal and spatial gradients in dissolved trace metals (Ag, Cd, Cu, Mn, Pb), organic and inorganic nutrients (POC, PON, DOC, N03 −, NH4 +, H4SiO4, PO4 −3, and urea), and algal biomass in a lagoon estuary, Great South Bay (GSB), New York, USA. While this estuary has experienced a series of environmental problems during recent decades (urbanization, loss of fisheries, harmful algal blooms), root causes are largely unknown, in part because levels of bioactive substances, such as trace metals, have never been measured. Sampling was undertaken within multiple estuarine, riverine, and groundwater sites during spring, summer, and fall. Trace metal tracers (e.g., Ag, Mn) and statistical analyses were used to differentiate the influences of natural and anthropogenic processes on the chemical composition of the lagoon. Our analyses revealed three clusters of biogeochemical constituents that behaved similarly in GSB: constituents under strong biological control such as POC, PON, DOC and chlorophyll,a; elements indicative of benthic remobilization processes such as Mn, Cd, and Cu; and constituents strongly influence by anthropogenic processes such as Ag, Pb, PO4 −3, NO3 −, and NH4 +. Although GSB is surrounded by a densely populated watershed (c. 1 million people), it does not appear to be significantly contaminated by trace metals compared to other urban estuaries. Levels of DOC (up to 760 μM) in GSB were well correlated with phytoplankton biomass and exceeded at least 98% of values reported in similar mid Atlantic estuaries at the same salinities. These high levels of DOC are likely to be an important source of carbon export to the coastal ocean and likely promote mixotrophic harmful algal blooms in this system.
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Clark, L.B., Gobler, C.J. & Sañudo-Wilhelmy, S.A. Spatial and temporal dynamics of dissolved trace metals, organic carbon, mineral nutrients, and phytoplankton in a coastal lagoon: Great South Bay, New York. Estuaries and Coasts: J ERF 29, 841–854 (2006). https://doi.org/10.1007/BF02786535
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DOI: https://doi.org/10.1007/BF02786535