Decoupling between water column oxygenation and benthic phosphate dynamics in a shallow eutrophic estuary

Peter Kraal, Edward D. Burton, Andrew L. Rose, Michael D. Cheetham, Richard T. Bush, Leigh A. Sullivan

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Estuaries are crucial biogeochemical filters at the land-ocean interface that are strongly impacted by anthropogenic nutrient inputs. Here, we investigate benthic nitrogen (N) and phosphorus (P) dynamics in relation to physicochemical surface sediment properties and bottom water mixing in the shallow, eutrophic Peel-Harvey Estuary. Our results show the strong dependence of sedimentary P release on Fe and S redox cycling. The estuary contains surface sediments that are strongly reducing and act as net P source, despite physical sediment mixing under an oxygenated water column. This decoupling between water column oxygenation and benthic P dynamics is of great importance to understand the evolution of nutrient dynamics in marine systems in response to increasing nutrient loadings. In addition, the findings show that the relationship between P burial efficiency and bottom water oxygenation depends on local conditions; sediment properties rather than oxygen availability may control benthic P recycling. Overall, our results illustrate the complex response of an estuary to environmental change because of interacting physical and biogeochemical processes.

Original languageEnglish
Pages (from-to)3114-3121
Number of pages8
JournalEnvironmental Science and Technology
Volume47
Issue number7
DOIs
Publication statusPublished - 2013
Externally publishedYes

Fingerprint

Oxygenation
oxygenation
Estuaries
Sediments
water column
Phosphates
phosphate
estuary
Nutrients
sediment property
Water
bottom water
nutrient
nutrient dynamics
Phosphorus
sediment
Recycling
environmental change
Nitrogen
recycling

Cite this

Kraal, Peter ; Burton, Edward D. ; Rose, Andrew L. ; Cheetham, Michael D. ; Bush, Richard T. ; Sullivan, Leigh A. / Decoupling between water column oxygenation and benthic phosphate dynamics in a shallow eutrophic estuary. In: Environmental Science and Technology. 2013 ; Vol. 47, No. 7. pp. 3114-3121.
@article{af4e82f2105a408d860119ff41b21cd1,
title = "Decoupling between water column oxygenation and benthic phosphate dynamics in a shallow eutrophic estuary",
abstract = "Estuaries are crucial biogeochemical filters at the land-ocean interface that are strongly impacted by anthropogenic nutrient inputs. Here, we investigate benthic nitrogen (N) and phosphorus (P) dynamics in relation to physicochemical surface sediment properties and bottom water mixing in the shallow, eutrophic Peel-Harvey Estuary. Our results show the strong dependence of sedimentary P release on Fe and S redox cycling. The estuary contains surface sediments that are strongly reducing and act as net P source, despite physical sediment mixing under an oxygenated water column. This decoupling between water column oxygenation and benthic P dynamics is of great importance to understand the evolution of nutrient dynamics in marine systems in response to increasing nutrient loadings. In addition, the findings show that the relationship between P burial efficiency and bottom water oxygenation depends on local conditions; sediment properties rather than oxygen availability may control benthic P recycling. Overall, our results illustrate the complex response of an estuary to environmental change because of interacting physical and biogeochemical processes.",
author = "Peter Kraal and Burton, {Edward D.} and Rose, {Andrew L.} and Cheetham, {Michael D.} and Bush, {Richard T.} and Sullivan, {Leigh A.}",
year = "2013",
doi = "10.1021/es304868t",
language = "English",
volume = "47",
pages = "3114--3121",
journal = "Environmental Science & Technology",
issn = "0013-936X",
publisher = "American Chemical Society",
number = "7",

}

Decoupling between water column oxygenation and benthic phosphate dynamics in a shallow eutrophic estuary. / Kraal, Peter; Burton, Edward D.; Rose, Andrew L.; Cheetham, Michael D.; Bush, Richard T.; Sullivan, Leigh A.

In: Environmental Science and Technology, Vol. 47, No. 7, 2013, p. 3114-3121.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Decoupling between water column oxygenation and benthic phosphate dynamics in a shallow eutrophic estuary

AU - Kraal, Peter

AU - Burton, Edward D.

AU - Rose, Andrew L.

AU - Cheetham, Michael D.

AU - Bush, Richard T.

AU - Sullivan, Leigh A.

PY - 2013

Y1 - 2013

N2 - Estuaries are crucial biogeochemical filters at the land-ocean interface that are strongly impacted by anthropogenic nutrient inputs. Here, we investigate benthic nitrogen (N) and phosphorus (P) dynamics in relation to physicochemical surface sediment properties and bottom water mixing in the shallow, eutrophic Peel-Harvey Estuary. Our results show the strong dependence of sedimentary P release on Fe and S redox cycling. The estuary contains surface sediments that are strongly reducing and act as net P source, despite physical sediment mixing under an oxygenated water column. This decoupling between water column oxygenation and benthic P dynamics is of great importance to understand the evolution of nutrient dynamics in marine systems in response to increasing nutrient loadings. In addition, the findings show that the relationship between P burial efficiency and bottom water oxygenation depends on local conditions; sediment properties rather than oxygen availability may control benthic P recycling. Overall, our results illustrate the complex response of an estuary to environmental change because of interacting physical and biogeochemical processes.

AB - Estuaries are crucial biogeochemical filters at the land-ocean interface that are strongly impacted by anthropogenic nutrient inputs. Here, we investigate benthic nitrogen (N) and phosphorus (P) dynamics in relation to physicochemical surface sediment properties and bottom water mixing in the shallow, eutrophic Peel-Harvey Estuary. Our results show the strong dependence of sedimentary P release on Fe and S redox cycling. The estuary contains surface sediments that are strongly reducing and act as net P source, despite physical sediment mixing under an oxygenated water column. This decoupling between water column oxygenation and benthic P dynamics is of great importance to understand the evolution of nutrient dynamics in marine systems in response to increasing nutrient loadings. In addition, the findings show that the relationship between P burial efficiency and bottom water oxygenation depends on local conditions; sediment properties rather than oxygen availability may control benthic P recycling. Overall, our results illustrate the complex response of an estuary to environmental change because of interacting physical and biogeochemical processes.

UR - http://www.scopus.com/inward/record.url?scp=84875784717&partnerID=8YFLogxK

U2 - 10.1021/es304868t

DO - 10.1021/es304868t

M3 - Article

VL - 47

SP - 3114

EP - 3121

JO - Environmental Science & Technology

JF - Environmental Science & Technology

SN - 0013-936X

IS - 7

ER -