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Comparisons of benthic filter feeder communities before and after a large-scale capital dredging program

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dc.contributor Australian Institute Of Marine Science
dc.contributor Western Australian Marine Sci Inst
dc.contributor Indian Ocean Marine Res Ctr
dc.contributor Australian Inst Marine Sci
dc.contributor Western Australian Museum
dc.contributor University Of Western Australia
dc.contributor Univ Western Australia M096 JONES, ROSS WAHAB, MUHAMMAD AZMI ABDUL FROMONT, JANE GOINEZ, OLIVER FISHER, REBECCA 2017-10-22T19:00:54Z 2017-10-22T19:00:54Z 2019-07-08T02:27:57Z 2017-10-22T19:00:54Z 2017-10-22T19:00:54Z 2019-07-08T02:27:57Z 2017-09-15
dc.identifier.citation Abdul Wahab MA, Fromont J, Gomez O, Fisher R, Jones R (2017) Comparisons of benthic filter feeder communities before and after a large-scale capital dredging program. Marine Pollution Bulletin 122: 176-193
dc.identifier.issn 0025-326X
dc.description.abstract Changes in turbidity, sedimentation and light over a two year large scale capital dredging program at Onslow, northwestern Australia, were quantified to assess their effects on filter feeder communities, in particular sponges. Community functional morphological composition was quantified using towed video surveys, while dive surveys allowed for assessments of species composition and chlorophyll content. Onslow is relatively diverse recording 150 sponge species. The area was naturally turbid (1.1 mean P-80 NTU), with inshore sites recording 6.5 x higher turbidity than offshore localities, likely influenced by the Ashburton River discharge. Turbidity and sedimentation increased by up to 146% and 240% through dredging respectively, with corresponding decreases in light levels. The effects of dredging was "variable, and despite existing caveats "(i.e. bleaching event and passing of a cyclone), the persistence of sponges and the absence of a"pronounced response post-dredging suggest environmental filtering or passive adaptation acquired pre-dredging may have benefited these communities.
dc.description.sponsorship This research was funded by the Western Australian Marine Science Institution (WAMSI; Theme 6.3, as part of the WAMSI Dredging Science Node, and made possible through investment from Chevron Australia, Woodside Energy Limited, BHP Billiton as environmental offsets and by co-investment from the WAMSI Joint Venture partners. This research was also enabled by data and information provided by Chevron Australia. The commercial entities had no role in data analysis, decision to publish, or preparation of the manuscript. The views expressed herein are those of the authors and not necessarily those of WAMSI. Sample collections for this study were made possible by permits granted by the Department of Parks and Wildlife (#SF010274) and Department of Fisheries (#2584). We thank CHL Schonberg for planning, executing and collecting data for the pre-dredging survey. We thank the Pilbara Ports Authority for pilot exemption for fieldwork at Onslow. B. Radford provided advice on towed video sampling design. We acknowledge P. Speare and M. Rees for work performed on towed video surveys, and E. Buttner, F. Siebler, S. Arklie, K. Brooks, S. Hahn and the skipper and crew onboard the RV Solander for assistance in the field. E. Buttner, F. Siebler and M. Gay assisted in chlorophyll extractions, and M. Bryce (WAM) and Z. Richards (WAM) assisted with identifications of cnidarians. M. Hagerty assisted with quality assessments of turbidity data and M. Case assisted with production of maps. M Puotinen provided information on cyclone activity. M. Broomhall and P. Fearns provided Landsat satellite images used in Fig. 1 and Supplementary Fig. 5. T. Elsdon and T. Rouphael provided advice on turbidity and PSD data.
dc.language English
dc.subject Great-barrier-reef
dc.subject Sedimentation
dc.subject Environmental-quality
dc.subject Porifera
dc.subject Marine & Freshwater Biology
dc.subject Light Attenuation
dc.subject Suspended Sediment
dc.subject Impacts
dc.subject Davies Reef
dc.subject Seasonal-changes
dc.subject Functional Morphology
dc.subject Marine Sponges
dc.subject Coral-reef
dc.subject Environmental Sciences & Ecology
dc.subject Sponge Assemblages
dc.subject Environmental Sciences
dc.subject Western Australia
dc.subject Western-australia
dc.subject Turbidity
dc.title Comparisons of benthic filter feeder communities before and after a large-scale capital dredging program
dc.type journal article
dc.identifier.doi 10.1016/j.marpolbul.2017.06.041
dc.identifier.wos WOS:000408076900031

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