We finally have some encouraging news on Great Barrier Reef water quality
Sediment and nitrogen runoff carried by rivers is a major challenge to the Great Barrier Reef. Science confirms efforts to improve water quality are paying off.
The Great Barrier Reef's water quality is showing promising signs of improvement, according to new research. The reef faces numerous threats, including climate change-induced marine heatwaves and nutrient pollution from land runoff. However, Australia has spent over A$5 billion on catchment programs to address water quality issues since 2014.
Our analysis of 37 years of monitoring data from seven major river systems indicates measurable reductions in fertiliser runoff and suspended sediment in many river basins that drain two-thirds of the reef's water catchments. These improvements occurred in bursts, often following significant rainfall, cyclones, land use changes, or shifts in fertiliser practices.
Farmers and graziers have adopted better farming practices, reducing synthetic fertiliser use by 25-49% since its peak in the 2000s and 2010s. While many rivers still exceed the thresholds for supporting healthy coastal and marine ecosystems, these findings suggest that long-term efforts to improve water quality are proving effective.
Continued monitoring and collaborative action will be crucial in maintaining this positive trend amid ongoing environmental challenges.
Written by urgent.news from The Conversation AU's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.