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...
Main Authors: | , , |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Subjects: | |
Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1074.2682 http://faculty.wwu.edu/%7Eshulld/Reprints/DSRII2012a.pdf |
id |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.1074.2682 |
---|---|
record_format |
openpolar |
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. |
_version_ |
1766377366904373248 |