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Assessment of Alkaline Phosphatase Activity in the Water Column of Maryland Coastal Bays.
- Source :
- Journal of Coastal Research; 2024, Vol. 40 Issue 2, p319-337, 19p
- Publication Year :
- 2024
-
Abstract
- Gurung, D.P.; Chen, N.; Waguespack, Y.; Ishaque, A.B., and Chigbu, P., 2024. Assessment of alkaline phosphatase activity in the water column of Maryland Coastal Bays. Journal of Coastal Research, 40(2), 319–337. Charlotte (North Carolina), ISSN 0749-0208. Understanding maximum alkaline phosphatase activity (V<subscript>max</subscript>) is essential to understand the phosphorus (P) cycle in Maryland Coastal Bays (MCBs). The objectives of this study were to measure V<subscript>max</subscript> in the samples collected from different locations in MCBs and to examine the relationship between V<subscript>max</subscript> and dissolved reactive phosphorus (DRP) concentrations. Water samples were collected at 13 sites from 2014 to 2016, and V<subscript>max</subscript> was measured in whole water by using 4-methylumbelliferyl phosphate as the fluorogenic substrate. Although the measured V<subscript>max</subscript> was affected by multiple factors, P limitation events were recognized from spatial/temporal distributions in V<subscript>max</subscript> values, which might not be reflected by DRP condition. Regression analysis did not yield a significant relationship between DRP and V<subscript>max</subscript>, and monthly averages of DRP and V<subscript>max</subscript> provide better evidence of the connection between DRP and V<subscript>max</subscript>, including P limitation (high V<subscript>max</subscript>) and alkaline phosphatase inhibition (low V<subscript>max</subscript>). Results from this study support the view that V<subscript>max</subscript> is a good indicator of availability of DRP in aquatic environments. More work is needed to further understand the relationship between V<subscript>max</subscript> and DRP, in particular, when strong P limitation occurs in the Bays. Moderate to strong positive relationships were observed between V<subscript>max</subscript> and chlorophyll a. Moderately negative relationships were observed between V<subscript>max</subscript> and salinity and between V<subscript>max</subscript> and pH, which may be attributed to freshwater inputs. Likewise, a moderate positive relationship was observed between V<subscript>max</subscript> and temperature for only some months. [ABSTRACT FROM AUTHOR]
- Subjects :
- ALKALINE phosphatase
WATER sampling
REGRESSION analysis
WATER use
CHLOROPHYLL
Subjects
Details
- Language :
- English
- ISSN :
- 07490208
- Volume :
- 40
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Journal of Coastal Research
- Publication Type :
- Academic Journal
- Accession number :
- 175823190
- Full Text :
- https://doi.org/10.2112/JCOASTRES-D-22-00077.1