Author's personal copy Roles of sorption and tube-dwelling benthos in the cycling of phosphorus in Bering Sea sediments

a b s t r a c t Adsorption of dissolved phosphate onto iron-hydroxides has been shown to be one of the primary regulators of phosphorus cycling in sediments. Bioturbation and bioirrigation by benthic infauna modify this cycling by accelerating the transport of dissolved and particulate phosphorus an...

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Main Authors: Emily S Davenport, David H Shull, Allan H Devol
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
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Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1074.2682
http://faculty.wwu.edu/%7Eshulld/Reprints/DSRII2012a.pdf
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spelling ftciteseerx:oai:CiteSeerX.psu:10.1.1.1074.2682 2023-05-15T15:43:18+02:00 Author's personal copy Roles of sorption and tube-dwelling benthos in the cycling of phosphorus in Bering Sea sediments Emily S Davenport David H Shull Allan H Devol The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1074.2682 http://faculty.wwu.edu/%7Eshulld/Reprints/DSRII2012a.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1074.2682 http://faculty.wwu.edu/%7Eshulld/Reprints/DSRII2012a.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://faculty.wwu.edu/%7Eshulld/Reprints/DSRII2012a.pdf text ftciteseerx 2020-04-26T00:27:26Z a b s t r a c t Adsorption of dissolved phosphate onto iron-hydroxides has been shown to be one of the primary regulators of phosphorus cycling in sediments. Bioturbation and bioirrigation by benthic infauna modify this cycling by accelerating the transport of dissolved and particulate phosphorus and by changing rates of reactions that occur in the sediment, such as the adsorption of phosphate by amorphous iron hydroxides. Hydrographic processes vary regionally in the Bering Sea and nutrient exchange between the sediments of the broad shallow shelf and overlying water may influence water column productivity. These characteristics make the Bering Sea a good study site for examining the processes that influence sedimentary cycling of phosphorus. To examine these processes, we collected samples in four domains (southern middle shelf, southern outer shelf, southern off shelf (consisting of the continental slope and Bering Sea basin) and northern Bering shelf) based on hydrographic regime. At each station we directly measured phosphate flux and sediment oxygen consumption using wholecore incubations. We also measured infaunal burrow abundances, amorphous iron-hydroxide concentrations and phosphate sorption. We found that three out of the four domains had a high affinity for trapping phosphate in the sediment, as indicated by their adsorption coefficients (6.59-81.81). However, the measured phosphate fluxes could not be explained by the adsorption capacity of the sediment alone. The results indicated that on the middle shelf, the phosphate flux positively co-varied with infaunal burrow abundances. The high number of organisms in this domain (10-32 burrows per 50 cm 2 core) enhances the flux of phosphate to the overlying water. Controls on the phosphate flux on the middle shelf cannot be properly understood unless benthic infaunal abundance is taken into account. Text Bering Sea Unknown Bering Sea Bering Shelf ENVELOPE(-170.783,-170.783,60.128,60.128) Burrows ENVELOPE(163.650,163.650,-74.300,-74.300)
institution Open Polar
collection Unknown
op_collection_id ftciteseerx
language English
description a b s t r a c t Adsorption of dissolved phosphate onto iron-hydroxides has been shown to be one of the primary regulators of phosphorus cycling in sediments. Bioturbation and bioirrigation by benthic infauna modify this cycling by accelerating the transport of dissolved and particulate phosphorus and by changing rates of reactions that occur in the sediment, such as the adsorption of phosphate by amorphous iron hydroxides. Hydrographic processes vary regionally in the Bering Sea and nutrient exchange between the sediments of the broad shallow shelf and overlying water may influence water column productivity. These characteristics make the Bering Sea a good study site for examining the processes that influence sedimentary cycling of phosphorus. To examine these processes, we collected samples in four domains (southern middle shelf, southern outer shelf, southern off shelf (consisting of the continental slope and Bering Sea basin) and northern Bering shelf) based on hydrographic regime. At each station we directly measured phosphate flux and sediment oxygen consumption using wholecore incubations. We also measured infaunal burrow abundances, amorphous iron-hydroxide concentrations and phosphate sorption. We found that three out of the four domains had a high affinity for trapping phosphate in the sediment, as indicated by their adsorption coefficients (6.59-81.81). However, the measured phosphate fluxes could not be explained by the adsorption capacity of the sediment alone. The results indicated that on the middle shelf, the phosphate flux positively co-varied with infaunal burrow abundances. The high number of organisms in this domain (10-32 burrows per 50 cm 2 core) enhances the flux of phosphate to the overlying water. Controls on the phosphate flux on the middle shelf cannot be properly understood unless benthic infaunal abundance is taken into account.
author2 The Pennsylvania State University CiteSeerX Archives
format Text
author Emily S Davenport
David H Shull
Allan H Devol
spellingShingle Emily S Davenport
David H Shull
Allan H Devol
Author's personal copy Roles of sorption and tube-dwelling benthos in the cycling of phosphorus in Bering Sea sediments
author_facet Emily S Davenport
David H Shull
Allan H Devol
author_sort Emily S Davenport
title Author's personal copy Roles of sorption and tube-dwelling benthos in the cycling of phosphorus in Bering Sea sediments
title_short Author's personal copy Roles of sorption and tube-dwelling benthos in the cycling of phosphorus in Bering Sea sediments
title_full Author's personal copy Roles of sorption and tube-dwelling benthos in the cycling of phosphorus in Bering Sea sediments
title_fullStr Author's personal copy Roles of sorption and tube-dwelling benthos in the cycling of phosphorus in Bering Sea sediments
title_full_unstemmed Author's personal copy Roles of sorption and tube-dwelling benthos in the cycling of phosphorus in Bering Sea sediments
title_sort author's personal copy roles of sorption and tube-dwelling benthos in the cycling of phosphorus in bering sea sediments
url http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1074.2682
http://faculty.wwu.edu/%7Eshulld/Reprints/DSRII2012a.pdf
long_lat ENVELOPE(-170.783,-170.783,60.128,60.128)
ENVELOPE(163.650,163.650,-74.300,-74.300)
geographic Bering Sea
Bering Shelf
Burrows
geographic_facet Bering Sea
Bering Shelf
Burrows
genre Bering Sea
genre_facet Bering Sea
op_source http://faculty.wwu.edu/%7Eshulld/Reprints/DSRII2012a.pdf
op_relation http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1074.2682
http://faculty.wwu.edu/%7Eshulld/Reprints/DSRII2012a.pdf
op_rights Metadata may be used without restrictions as long as the oai identifier remains attached to it.
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