Fears for Fitzgerald River National Park native species as bushfire burns UNESCO biosphere

The Fitzgerald River National Park is home to a diverse range of native plant species. (ABC Goldfields-Esperance: Robert Koenigluck)

As a bushfire continues to burn in one of Australia's most important biospheres, a local botanist worries native plants are not rejuvenating from historic blazes and says more research is required into the impacts of all fires, including prescribed burns.

Sparked by lightning, the latest bushfire has burned through 4,400 hectares in Fitzgerald River National Park on Western Australia's south coast over the past week.