期刊
MARINE POLLUTION BULLETIN
卷 122, 期 1-2, 页码 176-193出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2017.06.041
关键词
Western Australia; Porifera; Turbidity; Sedimentation; Light attenuation; Functional morphology
资金
- Western Australian Marine Science Institution (WAMSI
- Theme 6.3) as part of the WAMSI Dredging Science Node
- Chevron Australia
- Woodside Energy Limited
- BHP Billiton as environmental offsets
- WAMSI Joint Venture partners
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 apronounced response post-dredging suggest environmental filtering or passive adaptation acquired pre-dredging may have benefited these communities.
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