title: Abiotic factors influencing biomass accumulation of green tide causing Ulva spp. on Pyropia culture rafts in the Yellow Sea, China.
abstract: Annually recurrent green-tides in the Yellow Sea have been shown to result from direct disposal into the sea of fouling Ulva from Pyropia aquaculture. The role abiotic factors play in Ulva biomass accumulation on rafts was studied to find ways to mitigate this problem. Dissolved inorganic nitrogen (DIN) was very high at all sites, but the highest Ulva biomass was associated with the lowest DIN and anthropogenic N. Under luxuriant background nutrient conditions, variability in temperature and periods of emersion, rather than pH, light and salinity determined Ulva biomass. Two dominant species of Ulva displayed differing tolerances to temperature and desiccation which helped explain why Ulva prolifera dominates floating green-tides. Rather than trying to mitigate green-tides only by reducing nutrient pollution, an earlier harvest of Pyropia in southern Jiangsu Province especially before temperatures increase greatly above 10°C during April, could reduce the biomass of U. prolifera disposed from rafts.
authors.affiliation: CSIRO Oceans and Atmosphere, Private Bag 5, Wembley 6913, Australia; Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, 17th Chunhui Road, Laishan District, 264003 Yantai, Shandong, PR China. Electronic address: john.keesing@csiro.au.
authors.forename: John K
authors.initials: JK
authors.lastname: Keesing
authors.affiliation: Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, 17th Chunhui Road, Laishan District, 264003 Yantai, Shandong, PR China.
authors.forename: Dongyan
authors.initials: D
authors.lastname: Liu
authors.affiliation: Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, 17th Chunhui Road, Laishan District, 264003 Yantai, Shandong, PR China.
authors.forename: Yajun
authors.initials: Y
authors.lastname: Shi
authors.affiliation: Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, 17th Chunhui Road, Laishan District, 264003 Yantai, Shandong, PR China.
authors.forename: Yujue
authors.initials: Y
authors.lastname: Wang
mesh_terms: D017756:Aquaculture; D018533:Biomass; D002681:China; D004784:Environmental Monitoring; D009584:Nitrogen; D054712:Salinity; D013696:Temperature; D044445:Ulva / Q000254:growth & development*
chemical_list: D009584:Nitrogen
keywords: Porphyra; Pyropia; Ulva; emersion; green-tide