What specific threats are stressing the reef beyond El Nino?

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Other Threats Beyond El Nino Impacting the Great Barrier Reef

Beyond the significant threat posed by the extreme El Nino phenomenon, the Great Barrier Reef faces a confluence of stressors that collectively imperil its delicate ecosystem. These include pressures from extreme weather events, agricultural and urban run-off from land, ongoing coastal development, and the predatory impact of the Crown of Thorns starfish. These factors exacerbate the reef's vulnerability, contributing to a substantial decline in hard coral cover observed in 2024-2025.
Land-Based Run-off

Nutrient-rich run-off, primarily from agricultural lands and urban areas, poses a considerable threat to the Great Barrier Reef. This run-off carries sediments, fertilisers, and pesticides into the marine environment. High levels of nutrients can fuel algal blooms, which can smother corals and reduce light penetration necessary for their survival. Sediments can also directly bury and damage corals, hindering their growth and reproductive capabilities.
Coastal Development

Coastal development, including port expansions, dredging, and urbanisation along the Queensland coast, introduces a range of environmental challenges. Construction activities can directly damage reef structures and increase turbidity in the water, affecting coral health. Furthermore, urbanisation contributes to increased pollution and altered water flow patterns, impacting the delicate balance of the reef's ecosystem.
Crown of Thorns Starfish Predation

The Crown of Thorns starfish (Acanthaster planci) is a natural predator of coral, and outbreaks of this species can cause significant damage to reef systems. These starfish consume coral polyps, and during large outbreaks, they can decimate vast areas of coral. While natural, the frequency and severity of these outbreaks can be influenced by other environmental factors, including water quality, making the reef more susceptible to their impact.

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What specific threats are stressing the reef beyond El Nino?

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