Ecological processes:
Since 2019, most ecological processes on the Reef have remained generally stable. Reef building continues to deteriorate due to the impact of ocean acidification on calcification rates. Trends in recruitment are variable, but declines have been observed in some populations, including dugongs, turtles, and some species of coral.

Physical processes:
Most physical processes have remained stable or continued to deteriorate since 2019. Further changes to these processes are expected due to the continued influence of climate change and land-based run-off, which have broad implications for the Region.

Chemical processes:
The chemical processes within the Reef are generally in good condition. However nutrient cycling continues to be affected by land-based run-off. Ocean pH has decreased as a result of climate change.

Coastal ecosystems that support the Great Barrier Reef:
An understanding of the condition of most coastal ecosystems remains a significant knowledge gap. The extent of each coastal ecosystem has remained generally stable, but woodlands continue to be affected by clearance, albeit at a slower rate than in 2019.

Outbreaks of disease, introduced species and pest species:
Outbreaks of disease are localised and patchy across the Region, but have generally remained stable since 2019. Increased culling effort has reduced the impact of crown‑of‑thorns starfish, although the potential for new outbreaks remains. Other outbreaks, such as Trichodesmium, have increased, but data are limited on a broad scale.

Habitats to support species:
Overall, the condition of habitats is poor on a Region-wide scale, as habitat loss, degradation or alteration in a number of areas continues to have significant effects on populations of some dependent species. There is substantial variation in the assessed condition (and trend in condition) of different habitats, as well as in the amount of data available to inform each assessment. Coral reef condition varies between reefs and regions, and between inshore and offshore reefs. Recovery of key reef-building corals, particularly in the northern region, has contributed to an improved trend since 2019, and coral reefs are now assessed to be in poor (borderline good) condition overall. The condition of seagrass meadows has also improved somewhat since 2019, reflecting the recovery from past flooding impacts in some areas and is now considered in good (borderline poor) condition. Other habitats remain in good or very good condition. Although fewer intense disturbances (temperature extremes, cyclones) have affected habitats since 2019 up until the 2023–24 summer, the threats posed by climate change have not reduced, and most habitats remain extremely vulnerable.

Populations of species and groups of species:
Overall, the condition of species and groups of species remains poor on a Region-wide scale, mainly due to the impacts from ongoing climate change and localised reductions in water quality, and there is potential for compounding pressures. There is significant variation between different species and species groups and, in many cases, data are limited. Most populations of marine turtles and seabirds within the Region have declined, as have dugongs in the southern area of the Region, while humpback whales continue to show strong recovery. Increases in cover of some fast-growing corals have occurred, although species diversity and other aspects of coral condition likely remain affected. The condition of seagrasses has improved across many northern regions, but remains poor in the south.