Effects of combined dredging-related stressors on sponges: a laboratory approach using realistic scenarios

Pineda, Mari-Carmen, Strehlow, Brian, Kamp, Jasmine, Duckworth, Alan, Jones, Ross, and Webster, Nicole S. (2017) Effects of combined dredging-related stressors on sponges: a laboratory approach using realistic scenarios. Scientific Reports, 7 (1). 5155.

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Abstract

Dredging can cause increased suspended sediment concentrations (SSCs), light attenuation and sedimentation in marine communities. In order to determine the combined effects of dredging-related pressures on adult sponges, three species spanning different nutritional modes and morphologies were exposed to 5 treatment levels representing realistic dredging scenarios. Most sponges survived under low to moderate turbidity scenarios (SSCs of ≤ 33 mg L -1 , and a daily light integral of ≥0.5 mol photons m -2 d -1 ) for up to 28 d. However, under the highest turbidity scenario (76 mg L -1 , 0.1 mol photons m -2 d -1 ) there was 20% and 90% mortality of the phototrophic sponges Cliona orientalis and Carteriospongia foliascens respectively, and tissue regression in the heterotrophic Ianthella basta. All three sponge species exhibited mechanisms to effectively tolerate dredging-related pressures in the short term (e.g. oscula closure, mucus production and tissue regression), although reduced lipids and deterioration of sponge health suggest that longer term exposure to similar conditions is likely to result in higher mortality. These results suggest that the combination of high SSCs and low light availability can accelerate mortality, increasing the probability of biological effects, although there is considerable interspecies variability in how adult sponges respond to dredging pressures.

Item ID: 53946
Item Type: Article (Research - C1)
ISSN: 2045-2322
Funders: Western Australian Marine Science Institution (WAMSI), Chevron Australia, Woodside Energy Limited, BHP Billiton, Australian Research Council (ARC)
Projects and Grants: WAMSI Dredging Science Node, ARC future fellowship FT120100480
Date Deposited: 08 Jun 2018 03:43
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050204 Environmental Impact Assessment @ 50%
06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 50%
SEO Codes: 96 ENVIRONMENT > 9605 Ecosystem Assessment and Management > 960507 Ecosystem Assessment and Management of Marine Environments @ 100%
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