NDLI: Comparing Measures of Estuarine Ecosystem Production in a Temperate New England Estuary

Content Provider	Springer Nature Link
Author	Oczkowski, Autumn Hunt, Christopher W. Miller, Kenneth Oviatt, Candace Nixon, Scott Smith, Leslie
Copyright Year	2016
Abstract	Anthropogenic nutrient enrichments and concerted efforts at nutrient reductions, compounded with the influences of climate change, are likely changing the net ecosystem production (NEP) of our coastal systems. To quantify these changes, scientists monitor a range of physical, chemical, and biological parameters sampled at various frequencies. Water column chlorophyll concentrations are arguably the most commonly used indicator of net phytoplankton production, as well as a coarse indicator of NEP. We compared parameters that estimate production, including chlorophyll, across an experimental nutrient gradient and in situ in both well-mixed and stratified estuarine environments. Data from an experiment conducted in the early 1980s in mesocosms designed to replicate a well-mixed mid-Narragansett Bay (Rhode Island) water column were used to correlate changes in chlorophyll concentrations, pH, dissolved oxygen (O$_{2}$), dissolved inorganic nitrogen, phosphate, and silicate concentrations, cell counts, and $^{14}$C carbon uptake measurements across a range of nutrient enrichments. The pH, O$_{2}$, nutrient, and cell count measurements reflected seasonal cycles of spring blooms followed by late summer/early fall respiration periods across nutrient enrichments. Chlorophyll concentrations were more variable and rates of $^{14}$C productivity were inconsistent with observed trends in nutrient concentrations, pH, and O$_{2}$ concentrations. Similar comparisons were made using data from a well-mixed lower Narragansett Bay station and a more stratified upper Narragansett Bay station in 2007 and 2008. Trends among pH, O$_{2}$, and nutrient concentration parameters were similar to those observed in the mesocosm dataset, suggesting that continuous free water measurements of pH and O$_{2}$ seem to reliably reflect ecosystem metabolism and, while not perfect measures, may be underused indicators of NEP.
Starting Page	1827
Ending Page	1844
Page Count	18
File Format	PDF
ISSN	15592723
Journal	Estuaries
Volume Number	39
Issue Number	6
e-ISSN	15592731
Language	English
Publisher	Springer US
Publisher Date	2016-06-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	pH Dissolved oxygen Production Estuary Eutrophication Nutrients Ecosystem Environment Ecology Freshwater & Marine Ecology Environmental Management Coastal Sciences Water and Health
Content Type	Text
Resource Type	Article
Subject	Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics

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