Nutrient and phytoplankton responses to a flood event in a series of interconnected coastal lakes: Myall Lakes Australia |
| |
Authors: | Joanne Wilson |
| |
Institution: | (1) Centre for Natural Resources, NSW Department of Infrastructure, Planning and Natural Resources, P.O. Box 2815, Dangar, NSW, 2309, Australia;(2) Present address: The Nature Conservancy – Coral Triangle Center, Jalan Pengembak No. 2, Sanur, 80228, Bali, Indonesia |
| |
Abstract: | Myall Lakes is a large brackish coastal lake on the east coast of Australia that was considered pristine until the occurrence
of blue-green algal blooms in 1999. The temporal and spatial extent of chemical and biological changes to the water column
of Myall Lakes was studied intensively after a rain event in 2002. Water quality profiles (T, EC, pH, DO), turbidity (secchi),
nutrients (TN, NO
x
, NH4
+, DON, TP, FRP, DOP, Si), and phytoplankton (chl a and cell counts) were measured at nine sites on eight occasions immediately after the rain event. Freshwater inflows affected
a large area of the lake. Greatest changes were seen in areas close to the mouth of the upper Myall River which is the largest
freshwater input to the lakes. Here, greatly elevated concentrations of NO
x
, TP, and FRP (up to two orders of magnitude higher than background) were recorded immediately after the rain event but persisted
for only 2 to 8 days. Slightly elevated concentrations of TP and NO
x
were seen in inflows from the smaller Boolambayte Creek. Stratification was associated with bottom water anoxia and release
of ammonia from the sediments. Identification of the sources of nutrient species delivered from different parts of the catchment,
combined with studies of nutrient loads can assist managers to develop effective nutrient reduction strategies to reduce the
incidence of blue-green algal blooms in Myall Lakes. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|