Sponge spicule flux in Antarctic water column studied by sediment trap.
In Antarctic ecosystems, siliceous sponges play a pivotal role at different levels. They are one of the main components of the benthic biota showing species diversity and biomass levels comparable with those of tropical habitats. Demosponges and hexactinellids play a crucial role in the benthic-pela...
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ftunivgenova:oai:iris.unige.it:11567/881421 2024-02-11T09:58:27+01:00 Sponge spicule flux in Antarctic water column studied by sediment trap. Bertolino M. Ferranti M. P. Cutroneo L. Forero A. Bavestrello G. Capello M. Bertolino, M. Ferranti, M. P. Cutroneo, L. Forero, A. Bavestrello, G. Capello, M. 2013 STAMPA https://hdl.handle.net/11567/881421 eng eng country:AUS place:Fremantle info:eu-repo/semantics/altIdentifier/isbn/978-0-9874158-3-7 ispartofbook:ABSTRACTS: NINTH WORLD SPONGE CONFERENCE 2013 9th World Sponge Conference firstpage:99 lastpage:100 numberofpages:2 https://hdl.handle.net/11567/881421 Antarctica sponges spicules sediment resuspension info:eu-repo/semantics/conferenceObject 2013 ftunivgenova 2024-01-17T17:52:59Z In Antarctic ecosystems, siliceous sponges play a pivotal role at different levels. They are one of the main components of the benthic biota showing species diversity and biomass levels comparable with those of tropical habitats. Demosponges and hexactinellids play a crucial role in the benthic-pelagic coupling absorbing large amounts of dissolved silica that is accumulated in the opaline spicules of their skeleton.When sponges decay, the biogenic silica stored in their skeletons sunk in the sediments where, under the action of the currents, it accumulates in thick mats representing secondary biogenic substrata for benthic organisms. These free spicules show a negligible rate of dissolution representing therefore a net depletion of the dissolved silica from the system.The fluxes of biogenic silica in Antarctic waters have been mainly studied with particular regard to diatom frustules while no quantitative data are available for sponge spicules.In this paper we present the daily fluxes of sponge spicules in a sediment trap placed on a mooring 461 m depth on a bottom of 514 m depth in Terra Nova Bay (Ross Sea) from February 2003 to February 2005. The trend of the spicule sink, ranging from 7 to 19000 spicules m-2 d-1, is strongly correlated with that of total sediments with maximum values during the austral summer and minimum during winter. Spicule fluxes are significantly different among the years: the annual maximal values are always recorded in February with values of 5000, 19000 and 8000 spicules m-2 d-1, respectively for 2003, 2004 and 2005. The spicule weight, obtained from the biovolume, indicates that these structures represents 1-2% of the total sediments. From a quantitative point of view, demosponges and hexactinellids contribute with a similar amount to the total spicule number. Also the entire spicules and the fragments are almost evenly represented in the trap, suggesting an equivalent supply from living sponges and from sediment resuspension Conference Object Antarc* Antarctic Antarctica Ross Sea Università degli Studi di Genova: CINECA IRIS Antarctic Austral Ross Sea Terra Nova Bay |
institution |
Open Polar |
collection |
Università degli Studi di Genova: CINECA IRIS |
op_collection_id |
ftunivgenova |
language |
English |
topic |
Antarctica sponges spicules sediment resuspension |
spellingShingle |
Antarctica sponges spicules sediment resuspension Bertolino M. Ferranti M. P. Cutroneo L. Forero A. Bavestrello G. Capello M. Sponge spicule flux in Antarctic water column studied by sediment trap. |
topic_facet |
Antarctica sponges spicules sediment resuspension |
description |
In Antarctic ecosystems, siliceous sponges play a pivotal role at different levels. They are one of the main components of the benthic biota showing species diversity and biomass levels comparable with those of tropical habitats. Demosponges and hexactinellids play a crucial role in the benthic-pelagic coupling absorbing large amounts of dissolved silica that is accumulated in the opaline spicules of their skeleton.When sponges decay, the biogenic silica stored in their skeletons sunk in the sediments where, under the action of the currents, it accumulates in thick mats representing secondary biogenic substrata for benthic organisms. These free spicules show a negligible rate of dissolution representing therefore a net depletion of the dissolved silica from the system.The fluxes of biogenic silica in Antarctic waters have been mainly studied with particular regard to diatom frustules while no quantitative data are available for sponge spicules.In this paper we present the daily fluxes of sponge spicules in a sediment trap placed on a mooring 461 m depth on a bottom of 514 m depth in Terra Nova Bay (Ross Sea) from February 2003 to February 2005. The trend of the spicule sink, ranging from 7 to 19000 spicules m-2 d-1, is strongly correlated with that of total sediments with maximum values during the austral summer and minimum during winter. Spicule fluxes are significantly different among the years: the annual maximal values are always recorded in February with values of 5000, 19000 and 8000 spicules m-2 d-1, respectively for 2003, 2004 and 2005. The spicule weight, obtained from the biovolume, indicates that these structures represents 1-2% of the total sediments. From a quantitative point of view, demosponges and hexactinellids contribute with a similar amount to the total spicule number. Also the entire spicules and the fragments are almost evenly represented in the trap, suggesting an equivalent supply from living sponges and from sediment resuspension |
author2 |
Bertolino, M. Ferranti, M. P. Cutroneo, L. Forero, A. Bavestrello, G. Capello, M. |
format |
Conference Object |
author |
Bertolino M. Ferranti M. P. Cutroneo L. Forero A. Bavestrello G. Capello M. |
author_facet |
Bertolino M. Ferranti M. P. Cutroneo L. Forero A. Bavestrello G. Capello M. |
author_sort |
Bertolino M. |
title |
Sponge spicule flux in Antarctic water column studied by sediment trap. |
title_short |
Sponge spicule flux in Antarctic water column studied by sediment trap. |
title_full |
Sponge spicule flux in Antarctic water column studied by sediment trap. |
title_fullStr |
Sponge spicule flux in Antarctic water column studied by sediment trap. |
title_full_unstemmed |
Sponge spicule flux in Antarctic water column studied by sediment trap. |
title_sort |
sponge spicule flux in antarctic water column studied by sediment trap. |
publisher |
country:AUS |
publishDate |
2013 |
url |
https://hdl.handle.net/11567/881421 |
geographic |
Antarctic Austral Ross Sea Terra Nova Bay |
geographic_facet |
Antarctic Austral Ross Sea Terra Nova Bay |
genre |
Antarc* Antarctic Antarctica Ross Sea |
genre_facet |
Antarc* Antarctic Antarctica Ross Sea |
op_relation |
info:eu-repo/semantics/altIdentifier/isbn/978-0-9874158-3-7 ispartofbook:ABSTRACTS: NINTH WORLD SPONGE CONFERENCE 2013 9th World Sponge Conference firstpage:99 lastpage:100 numberofpages:2 https://hdl.handle.net/11567/881421 |
_version_ |
1790594099847364608 |