Hyperspectral imaging of the microscale distribution and dynamics of microphytobenthos in intertidal sediments

Handle URI:
http://hdl.handle.net/10754/555800
Title:
Hyperspectral imaging of the microscale distribution and dynamics of microphytobenthos in intertidal sediments
Authors:
Chennu, Arjun; Färber, Paul; Volkenborn, Nils; Alnajjar, Mohammad Ahmad ( 0000-0003-4861-1604 ) ; Janssen, Felix; de Beer, Dirk; Polerecky, Lubos
Abstract:
We describe a novel, field-deployable hyperspectral imaging system, called Hypersub, that allows noninvasive in situ mapping of the microphytobenthos (MPB) biomass distribution with a high spatial (sub-millimeter) and temporal (minutes) resolution over areas of 1 × 1 m. The biomass is derived from a log-transformed and near-infrared corrected reflectance hyperspectral index, which exhibits a linear relationship (R2 > 0.97) with the chlorophyll a (Chl a) concentration in the euphotic zone of the sediment and depends on the sediment grain size. Deployments of the system revealed that due to factors such as sediment topography, bioturbation, and grazing, the distribution of MPB in intertidal sediments is remarkably heterogeneous, with Chl a concentrations varying laterally by up to 400% of the average value over a distance of 1 cm. Furthermore, due to tidal cycling and diel light variability, MPB concentrations in the top 1 mm of sediments are very dynamic, changing by 40–80% over a few hours due to vertical migration. We argue that the high-resolution hyperspectral imaging method overcomes the inadequate resolution of traditional methods based on sedimentary Chl a extraction, and thus helps improve our understanding of the processes that control benthic primary production in coastal sediments.
KAUST Department:
Red Sea Research Center (RSRC)
Citation:
Hyperspectral imaging of the microscale distribution and dynamics of microphytobenthos in intertidal sediments 2013, 11 (10):511 Limnology and Oceanography: Methods
Publisher:
Wiley-Blackwell
Journal:
Limnology and Oceanography: Methods
Issue Date:
3-Oct-2013
DOI:
10.4319/lom.2013.11.511
Type:
Article
ISSN:
15415856
Additional Links:
http://doi.wiley.com/10.4319/lom.2013.11.511
Appears in Collections:
Articles; Red Sea Research Center (RSRC); Red Sea Research Center (RSRC)

Full metadata record

DC FieldValue Language
dc.contributor.authorChennu, Arjunen
dc.contributor.authorFärber, Paulen
dc.contributor.authorVolkenborn, Nilsen
dc.contributor.authorAlnajjar, Mohammad Ahmaden
dc.contributor.authorJanssen, Felixen
dc.contributor.authorde Beer, Dirken
dc.contributor.authorPolerecky, Lubosen
dc.date.accessioned2015-05-26T08:06:20Zen
dc.date.available2015-05-26T08:06:20Zen
dc.date.issued2013-10-03en
dc.identifier.citationHyperspectral imaging of the microscale distribution and dynamics of microphytobenthos in intertidal sediments 2013, 11 (10):511 Limnology and Oceanography: Methodsen
dc.identifier.issn15415856en
dc.identifier.doi10.4319/lom.2013.11.511en
dc.identifier.urihttp://hdl.handle.net/10754/555800en
dc.description.abstractWe describe a novel, field-deployable hyperspectral imaging system, called Hypersub, that allows noninvasive in situ mapping of the microphytobenthos (MPB) biomass distribution with a high spatial (sub-millimeter) and temporal (minutes) resolution over areas of 1 × 1 m. The biomass is derived from a log-transformed and near-infrared corrected reflectance hyperspectral index, which exhibits a linear relationship (R2 > 0.97) with the chlorophyll a (Chl a) concentration in the euphotic zone of the sediment and depends on the sediment grain size. Deployments of the system revealed that due to factors such as sediment topography, bioturbation, and grazing, the distribution of MPB in intertidal sediments is remarkably heterogeneous, with Chl a concentrations varying laterally by up to 400% of the average value over a distance of 1 cm. Furthermore, due to tidal cycling and diel light variability, MPB concentrations in the top 1 mm of sediments are very dynamic, changing by 40–80% over a few hours due to vertical migration. We argue that the high-resolution hyperspectral imaging method overcomes the inadequate resolution of traditional methods based on sedimentary Chl a extraction, and thus helps improve our understanding of the processes that control benthic primary production in coastal sediments.en
dc.publisherWiley-Blackwellen
dc.relation.urlhttp://doi.wiley.com/10.4319/lom.2013.11.511en
dc.rightsArchived with thanks to Limnology and Oceanography: Methodsen
dc.titleHyperspectral imaging of the microscale distribution and dynamics of microphytobenthos in intertidal sedimentsen
dc.typeArticleen
dc.contributor.departmentRed Sea Research Center (RSRC)en
dc.identifier.journalLimnology and Oceanography: Methodsen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionMax Planck Institute for Marine Microbiology, Celsiusstr. 1, Bremen 28359, Germanyen
dc.contributor.institutionDept. of Biological Sciences, University of South Carolina, Columbia SC 29208, USAen
dc.contributor.institutionIFREMER, Laboratory of Benthic Ecology, Technopole Brest BP70, Plouzane, Franceen
dc.contributor.institutionAlfred Wegener Institute for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germanyen
dc.contributor.institutionDepartment of Earth Sciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlandsen
kaust.authorAlnajjar, Mohammad Ahmaden
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