NDLI: Regional Forcing by Light on Dissolved Oxygen Levels in Shallow Temperate Estuaries

Content Provider	Springer Nature Link
Author	Sawabini, Anna M. Schlezinger, David R. Sundermeyer, Miles A. Howes, Brian L.
Copyright Year	2014
Abstract	Estuarine oxygen and regional meteorological conditions were studied for 24 Massachusetts estuaries to determine regional influences of light on oxygen dynamics. During July and August 2006, near-bottom dissolved oxygen (DO), temperature, salinity, chlorophyll-a, tide stage, and photosynthetically active radiation (PAR) were measured. Relative low or high DO extrema occurred simultaneously across multiple estuaries despite differences in total oxygen levels. July and August had a total of 19 days with low DO in more than 25 % of sites, including 8 days with low DO in more than 50 % of sites. PAR averaged across nine monitoring locations accounted for a significant fraction of regional DO variance. Correlations between regional DO and regional light were greatest for a 1-day lag in light. Low DO occurred more frequently during low light conditions (PAR < 400 μE m$^{−2}$ s$^{−1}$), and high DO during high light conditions (PAR > 400 μE m$^{−2}$ s$^{−1}$). Precipitation did not appear to be a direct driver of DO during this timeframe. Comparison of chlorophyll-a with DO showed a negative correlation, indicating that respiration outpaced photosynthesis. These results suggest that local factors create the potential for hypoxia, but that regional light levels provide a key trigger.
Starting Page	1062
Ending Page	1076
Page Count	15
File Format	PDF
ISSN	15592723
Journal	Estuaries
Volume Number	38
Issue Number	3
e-ISSN	15592731
Language	English
Publisher	Springer US
Publisher Date	2014-09-13
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Dissolved oxygen Estuary Light Hypoxia PAR Massachusetts 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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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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