Effects of suspended sediments on the sponge holobiont with implications for dredging management

Abstract Dredging can cause high suspended sediment concentrations (SSC) in the water column, posing a hazard to filter feeding organisms like sponges as sediment may clog their aquiferous systems and reduce feeding. In order to provide pressure−response values for sponges to SSC and tease apart the...

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Autores principales:	Mari-Carmen Pineda, Brian Strehlow, Miriam Sternel, Alan Duckworth, Ross Jones, Nicole S. Webster
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/8574c06825394b7cbd41040faab7c8a9
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spelling	oai:doaj.org-article:8574c06825394b7cbd41040faab7c8a92021-12-02T11:52:26ZEffects of suspended sediments on the sponge holobiont with implications for dredging management10.1038/s41598-017-05241-z2045-2322https://doaj.org/article/8574c06825394b7cbd41040faab7c8a92017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-05241-zhttps://doaj.org/toc/2045-2322Abstract Dredging can cause high suspended sediment concentrations (SSC) in the water column, posing a hazard to filter feeding organisms like sponges as sediment may clog their aquiferous systems and reduce feeding. In order to provide pressure−response values for sponges to SSC and tease apart the cause:effect pathways of dredging pressures, five heterotrophic and phototrophic species were experimentally exposed to a range of dredging-relevant SSC of up to 100 mg L−1, with light compensation across treatments to ensure that SSC was the primary physical parameter. This study shows that some sponge species exposed to high SSC (≥23 mg L−1) for extended periods (28 d) have lower survival, increased necrosis and depletion of energy reserves. In contrast, SSC of ≤10 mg L−1 caused few, if any, negative effects and is thus suggested as a prudent sub-lethal threshold for sponges. Microbial communities did not change significantly among SSC treatments, although a nutritional shift from mixotrophy towards increased phototrophy was detected for some sponge species exposed to high SSC. Importantly however, it is expected that the combined effect of SSC with low light availability and sediment smothering as occurs during dredging operations will increase the negative effects on sponges.Mari-Carmen PinedaBrian StrehlowMiriam SternelAlan DuckworthRoss JonesNicole S. WebsterNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-15 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Mari-Carmen Pineda Brian Strehlow Miriam Sternel Alan Duckworth Ross Jones Nicole S. Webster Effects of suspended sediments on the sponge holobiont with implications for dredging management
description	Abstract Dredging can cause high suspended sediment concentrations (SSC) in the water column, posing a hazard to filter feeding organisms like sponges as sediment may clog their aquiferous systems and reduce feeding. In order to provide pressure−response values for sponges to SSC and tease apart the cause:effect pathways of dredging pressures, five heterotrophic and phototrophic species were experimentally exposed to a range of dredging-relevant SSC of up to 100 mg L−1, with light compensation across treatments to ensure that SSC was the primary physical parameter. This study shows that some sponge species exposed to high SSC (≥23 mg L−1) for extended periods (28 d) have lower survival, increased necrosis and depletion of energy reserves. In contrast, SSC of ≤10 mg L−1 caused few, if any, negative effects and is thus suggested as a prudent sub-lethal threshold for sponges. Microbial communities did not change significantly among SSC treatments, although a nutritional shift from mixotrophy towards increased phototrophy was detected for some sponge species exposed to high SSC. Importantly however, it is expected that the combined effect of SSC with low light availability and sediment smothering as occurs during dredging operations will increase the negative effects on sponges.
format	article
author	Mari-Carmen Pineda Brian Strehlow Miriam Sternel Alan Duckworth Ross Jones Nicole S. Webster
author_facet	Mari-Carmen Pineda Brian Strehlow Miriam Sternel Alan Duckworth Ross Jones Nicole S. Webster
author_sort	Mari-Carmen Pineda
title	Effects of suspended sediments on the sponge holobiont with implications for dredging management
title_short	Effects of suspended sediments on the sponge holobiont with implications for dredging management
title_full	Effects of suspended sediments on the sponge holobiont with implications for dredging management
title_fullStr	Effects of suspended sediments on the sponge holobiont with implications for dredging management
title_full_unstemmed	Effects of suspended sediments on the sponge holobiont with implications for dredging management
title_sort	effects of suspended sediments on the sponge holobiont with implications for dredging management
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/8574c06825394b7cbd41040faab7c8a9
work_keys_str_mv	AT maricarmenpineda effectsofsuspendedsedimentsonthespongeholobiontwithimplicationsfordredgingmanagement AT brianstrehlow effectsofsuspendedsedimentsonthespongeholobiontwithimplicationsfordredgingmanagement AT miriamsternel effectsofsuspendedsedimentsonthespongeholobiontwithimplicationsfordredgingmanagement AT alanduckworth effectsofsuspendedsedimentsonthespongeholobiontwithimplicationsfordredgingmanagement AT rossjones effectsofsuspendedsedimentsonthespongeholobiontwithimplicationsfordredgingmanagement AT nicoleswebster effectsofsuspendedsedimentsonthespongeholobiontwithimplicationsfordredgingmanagement
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Effects of suspended sediments on the sponge holobiont with implications for dredging management

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