Possible drivers of a Chrysosporum ovalisporum bloom in the Murray River, Australia, in 2016
Lee Bowling
A H I , Darren Baldwin B , Chester Merrick C F , John Brayan D G and Jared Panther E
+ Author Affiliations
- Author Affiliations
A Centre for Ecosystem Science, The University of New South Wales, Sydney, NSW 2052, Australia.
B School of Environmental Sciences, Charles Sturt University, Thurgoona, NSW 2640, Australia.
C DPI Water, Department of Primary Industries, PO Box 829, Albury, NSW 2640, Australia.
D DPI Water, Department of Primary Industries, Elizabeth Macarthur Agricultural Institute, Private Bag 4008, Narellan, NSW 2568, Australia.
E Goulburn–Murray Water, PO Box 165, Tatura, Vic. 3616, Australia.
F Present address: Water NSW, PO Box 829, Albury, NSW 2640, Australia.
G Present address: Crown Lands and Water, PO Box 3720, Parramatta, NSW 2124, Australia.
H Retired, formerly at DPI Water, Department of Primary Industries, Elizabeth Macarthur Agricultural Institute, Private Bag 4008, Narellan, NSW 2568, Australia.
I Corresponding author. Email: bowlinglimnology@gmail.com
Marine and Freshwater Research 69(11) 1649-1662 https://doi.org/10.1071/MF18014
Submitted: 15 January 2018 Accepted: 9 May 2018 Published: 27 July 2018
Abstract
A major bloom of Chrysosporum ovalisporum occurred in ~2360 km of the Murray–Edward–Wakool River System, Australia, during the 2016 austral summer and autumn. Several potential causes were investigated. Although summer air temperatures were among the hottest on record, no significant relationships were found between meteorological factors and bloom abundance. Instead, a weak but significant relationship was found between surface water temperature and bloom abundance downstream of Lake Hume, because the hot weather is likely to have led to higher water temperatures promoting bloom development. Releases of cold water inflows into Lake Hume from its Murray River arm may have stimulated upwelling of nutrient-rich deeper water, promoting the establishment of the bloom in that lake. Total nitrogen and total phosphorus concentrations were within the mesoeutrophic range and significantly related to bloom abundance, although some nutrient would be contained within cyanobacterial cells. During peak bloom abundance, pH was above 8.5 at one site. One unusual feature was that the bloom occurred in very dilute water, at electrical conductivities of 40–50 µS cm–1. However, this does not appear to have affected carbon uptake and photosynthesis at high pH. Further blooms may occur if similar hot summers occur in future.
Additional keywords: climate change, headwater reservoir, hydrology, nutrients, water temperature.
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