Centre for Sustainable Aquatic Ecosystems, Harry Butler Institute, Murdoch University, 90 South St, Murdoch 6150, Western Australia, Australia; Department of Primary Industries and Regional Development, Post Office Box 20, North Beach 6920, Western Australia, Australia.
Centre for Sustainable Aquatic Ecosystems, Harry Butler Institute, Murdoch University, 90 South St, Murdoch 6150, Western Australia, Australia; Ecoscope-epc, 20 Carlisle Street, Shoalwater 6169, Western Australia, Australia.
Mar Pollut Bull. 2021 Jun;167:112330. doi: 10.1016/j.marpolbul.2021.112330. Epub 2021 Apr 28.
The characteristics of detached macroalgae (drift) in nearby highly eutrophic and mesotrophic estuaries in south-western Australia are compared to elucidate the magnitude and types of changes that occur in macroalgal drift when estuaries receive excessive nutrient input. Drift characteristics in the large basins of the microtidal, eutrophic Peel-Harvey and mesotrophic Swan-Canning, which is not subjected to large nutrient inputs directly from agricultural land, differed markedly. Biomass (dry weight) in mesotrophic estuary was dominated by rhodophytes (92%), particularly Laurencia and Hypnea, and in eutrophic estuary by opportunistic chlorophytes (68%), especially Chaetomorpha and Ulva. Prevalence and biomass of drift were far greater in the eutrophic estuary, particularly during summer and autumn when macroalgal growth rose sharply. Macroalgal biomass in the eutrophic estuary was positively related to salinity. These results facilitate predictions of how climatic and other anthropogenic changes influence extent of macroalgal growth and thus change the estuarine environment.
澳大利亚西南部富营养化和中等营养化河口附近游离大型海藻（漂移）的特征进行了比较，以阐明当河口接受过量养分输入时，大型海藻漂移发生的变化的程度和类型。在微潮、富营养化的皮尔-哈维（Peel-Harvey）和中等营养化的斯旺-坎宁（Swan-Canning）等大型盆地中，漂移特征明显不同。在中等营养化的河口，生物量（干重）主要由红藻（92%）组成，特别是劳伦西亚（Laurencia）和海莴苣（Hypnea），而在富营养化的河口，机会主义的绿藻（68%）占主导地位，特别是石莼（Chaetomorpha）和石花菜（Ulva）。漂移的普遍性和生物量在富营养化的河口要大得多，特别是在夏季和秋季，大型海藻的生长急剧上升时。富营养化河口的大型海藻生物量与盐度呈正相关。这些结果有助于预测气候和其他人为变化如何影响大型海藻生长的范围，从而改变河口环境。
