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Potential for algal blooms in tropical rivers of the Northern Territory, Australia

Ganf, GG and Rea, N (2007). Potential for algal blooms in tropical rivers of the Northern Territory, Australia. Marine and Freshwater Research,58(4):315-326.

Document type: Journal Article
Citation counts: TR Web of Science Citation Count  Cited 10 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 12 times in Scopus Article | Citations

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ISI LOC 000245689800002
Title Potential for algal blooms in tropical rivers of the Northern Territory, Australia
Author Ganf, GG
Rea, N
Journal Name Marine and Freshwater Research
Publication Date 2007
Volume Number 58
Issue Number 4
ISSN 1323-1650   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-34247378157
Start Page 315
End Page 326
Total Pages 12
Place of Publication Collingwood
Publisher CSIRO Publishing
Field of Research 0405 - Oceanography
0602 - Ecology
0704 - Fisheries Sciences
HERDC Category C1 - Journal Article (DEST)
Abstract Rivers in the Northern Territory (NT) of Australia are under pressure from increasing vegetation clearance, land use and nutrient run-off. The literature on algal blooms clearly identifies the predisposing factors but in the NT, these factors are not well researched. We report on the potential for tropical rivers to experience problems related to algal growth. NT rivers were found to have a low nutrient status and a viable inoculum of blue-green, brown and green algal communities. The growth response of these algal groups to nutrient enrichment via bioassays and pulse-amplitude-modulation (PAM) fluorometry measurements varied among rivers and the addition of N, P or N & P. However, the overwhelming findings were that all rivers had the potential to experience algal blooms with enrichment. Back-calculations based on the chlorophyll concentrations recorded in bioassay experiments and stoichiometric ratios of chlorophyll: nutrients suggest there are pools of biologically available organic forms of N and P in addition to inorganic forms. The role of river length in the development of algal blooms was investigated: the longer the river reach, the slower the flow, and the greater the availability of nutrients, the higher potential for algal blooms. Given the strong indications that increased nutrient run-off to tropical rivers will result in algal blooms, prudent land-use and development with nutrient management strategies is essential.
Keywords biologically available nutrients
cyanobacteria
discharge
river length
stoichiometry
phytoplankton biomass
anabaena circinalis
wet/dry tropics
daly river
reservoirs
nitrogen
DOI http://dx.doi.org/10.1071/MF06161   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
 
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Created: Mon, 08 Sep 2008, 16:16:22 CST