Monitoring seagrass beds around a sewage sludge outfall in South Australia |
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| Affiliation: | 1. Central Michigan University, Department of Biology, Biosciences 2100, Mount Pleasant, MI 48859, United States of America;2. Michigan Department of Natural Resources, Charlevoix Fisheries Research Station, 96 Grant St., Charlevoix, MI 49720, United States of America;3. The Nature Conservancy, 1400 E. Angela Boulevard, Unit #117, South Bend, IN 46617, United States of America;4. Michigan Department of Natural Resources, Oden State Fish Hatchery, 8258 S. Ayr Road, Alanson, MI 49706, United States of America;5. The Nature Conservancy, 101 E. César E. Chávez Avenue, Lansing, MI 48906, United States of America;1. Shimoda Marine Research Center, University of Tsukuba, 5-10-1, Shimoda, Shizuoka 415-0025, Japan;2. Department of Marine Science, Faculty of Science and Fisheries Technology, Rajamangala University of Technology Srivijaya, Sikao, Trang 92150, Thailand;3. Department of Global Agricultural Science, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo 113-8657, Japan |
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| Abstract: | Digested sludge from the Port Adelaide Sewage Treatment Works has been discharged to Gulf St. Vincent, a marine embayment in South Australia, since 1978. The outfall is sited in seagrass meadows dominated by Posidonia spp. and Amphibolis spp. By 1982 the discharge had affected an area of approximately 1900 ha, 365 ha of which were completely denuded of these seagrasses. A monitoring programme conducted over summers 1983–1985, inclusive, was based on the above-ground biomass (standing crop) of Posidonia at fourteen sites around the outfall. All sites were surveyed in the first two summers and eight sites were surveyed in the third. The results indicate that there was no ongoing reduction in the standing crop of Posidonia at any of the sites. These data also suggested that excessive growth of epiphytes on the leaves of Posidonia was a likely cause of the observed impact on the seagrass beds. |
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