NDLI: The Contribution of Benthic Nutrient Regeneration to Primary Production in a Shallow Eutrophic Estuary, Weeks Bay, Alabama

Content Provider	Springer Nature Link
Author	Mortazavi, Behzad Riggs, Ashley A. Caffrey, Jane M. Genet, Hélène Phipps, Scott W.
Copyright Year	2012
Abstract	Benthic oxygen, dinitrogen, and nutrient fluxes (NH 4 + , NO 3 − , and PO 4 3− ) were measured monthly during a 1-year period at two locations in Weeks Bay, a shallow (1.4 m) and eutrophic estuary in Alabama. Gross primary productivity (GPP), ecosystem respiration (R), and net ecosystem metabolism were determined from high-frequency dissolved oxygen measurements. Peak water column NO 3 − (55 μM) and chlorophyll a (138 μg/l) concentrations were measured during spring and fall, respectively. Sediments were a net source of NH 4 + (102 μmol m$^{−2}$ h$^{−1}$) and PO 4 3− (0.9 μmol m$^{−2}$ h$^{−1}$) but a sink for NO 3 − (−30 μmol m$^{−2}$ h$^{−1}$). Benthic N$_{2}$ fluxes indicated net N fixation (12 μmol N m$^{−2}$ h$^{−1}$). Sediment oxygen demand (0.55 g O$_{2}$ m$^{−2}$ day$^{−1}$) accounted for <10% of R (7.3 g O$_{2}$ m$^{−2}$ day$^{−1}$). Despite high GPP rates (4.7 g O$_{2}$ m$^{−2}$ day$^{−1}$), the estuary was net heterotrophic. Benthic regeneration supplied, on average, 7.5% and 4% of primary productivity N and P demands, respectively. These results contrast with the conventional view that benthic regeneration accounts for a large fraction of phytoplankton nutrient demand in shallow estuaries.
Starting Page	862
Ending Page	877
Page Count	16
File Format	PDF
ISSN	15592723
Journal	Estuaries
Volume Number	35
Issue Number	3
e-ISSN	15592731
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-01-26
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	production Respiration Net ecosystem metabolism Benthic flux Freshwater & Marine Ecology Ecology Nature Conservation Environment Coastal Sciences Environmental Management
Content Type	Text
Resource Type	Article
Subject	Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics

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