Resolving community metabolism of eelgrass Zostera marina meadows by benthic flume-chambers and eddy covariance in dynamic coastal environments

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Camillini , N , Attard , K M , Eyre , B D & Glud , R N 2021 , ' Resolving community metabolism of eelgrass Zostera marina meadows by benthic flume-chambers and eddy covariance in dynamic coastal environments ' , Marine Ecology. Progress Series , vol. 661 , pp. 97-114 . https://doi.org/10.3354/meps13616

Title: Resolving community metabolism of eelgrass Zostera marina meadows by benthic flume-chambers and eddy covariance in dynamic coastal environments
Author: Camillini, Nicola; Attard, Karl M.; Eyre, Bradley D.; Glud, Ronnie N.
Contributor organization: Ecosystems and Environment Research Programme
Tvärminne Benthic Ecology Team
Marine Ecosystems Research Group
Tvärminne Zoological Station
Date: 2021-03-04
Language: eng
Number of pages: 18
Belongs to series: Marine Ecology. Progress Series
ISSN: 0171-8630
DOI: https://doi.org/10.3354/meps13616
URI: http://hdl.handle.net/10138/330835
Abstract: Sediment resuspension is a common process in dynamic coastal settings, but its implications for remineralization and carbon turnover in seagrass meadows are poorly understood. Here, we assessed eelgrass Zostera marina metabolism in the Baltic Sea (SW Finland) using benthic flume-chambers and aquatic eddy covariance to critically evaluate the drivers of benthic O-2 exchange during dynamic flow conditions. During quiescent weather conditions, the 2 methods resolved similar metabolic rates and net ecosystem autotrophy (+/- 11% of each other). However, elevated flow speeds and sediment resuspension halfway through the study induced a 5-fold increase in the O-2 uptake rates measured by eddy covariance, whereas chamber fluxes remained relatively unchanged. Following particle resettlement, instruments were redeployed and the benthic O-2 uptake resolved by both techniques was just similar to 30% of the values measured before resuspension. Laboratory investigations revealed sediment resuspension could potentially increase benthic O-2 uptake up to 6-fold, mainly due to the reoxidation of reduced compounds (e.g. FeSx). This process was fully captured by the eddy O-2 fluxes, but not by the chamber incubation. Consequently, the chamber and eddy net ecosystem metabolism amounted to - 17 and -824 mmol C m(-2), respectively, throughout the study period. The rapid reoxidation and long-term effects of resuspension on benthic O-2 dynamics highlight the importance of fully capturing dynamic conditions when assessing the overall carbon turnover in coastal habitats. Future studies on the biogeochemical functioning of coastal environments should aim to capture the natural frequency and duration of resuspension events.
Subject: Benthic oxygen exchange
Seagrass
Oxygen storage
Wind waves
Sediment resuspension
SEDIMENT RESUSPENSION
ECOSYSTEM METABOLISM
POSIDONIA-OCEANICA
NUTRIENT FLUXES
ORGANIC-MATTER
OXYGEN FLUXES
NATURAL-POPULATIONS
PERMEABLE SEDIMENTS
SEASONAL-VARIATION
DISSOLVED-OXYGEN
1181 Ecology, evolutionary biology
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


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