This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: Australia is one of the world's great ocean nations. It is home to more marine species than any other country, with ocean ecosystems spanning all five of the world's climate zones, from the coral-rich tropics to the icy shores of Antarctica.
These ecosystems help regulate the climate while also supporting fisheries, tourism, cultural values and livelihoods. Australia proudly claims to be an international leader in marine conservation, and we've created one of the world's largest marine park networks. But size alone doesn't tell the whole story.
With a once-in-a-decade review of Commonwealth marine parks underway, it is time for science to speak up. Decades of evidence show that despite these parks, Australia's extraordinary marine biodiversity is under increasing pressure. And far more is known today about what protections actually work than when many of the marine parks were first established.
In research published last year, researchers asked a simple question: Does Australia's reputation as a global marine conservation leader match the evidence? While Australia has achieved important conservation successes, they also found substantial declines across many marine species and ecosystems. These were driven by climate change, habitat degradation, unsustainable pressures and gaps in how the oceans are managed.
One of the problems is the level of protection marine parks provide. It is easy to assume that once an area is designated as a marine park, it is fully protected. But the reality is that protection exists on a spectrum.
Some zones prohibit extractive activities such as commercial fishing and mining, while others allow a range of industrial uses to continue. The strongest scientific evidence of the benefits of protection consistently comes from areas that are highly protected "no-take" sanctuary zones. Across hundreds of studies worldwide, these areas support greater biodiversity, have healthier ecosystems and larger fish populations, and exhibit stronger resilience to the impacts of climate change than areas with lower levels of protection.
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