Dr Carles Vila, from the Conservation and Evolutionary Genetics Group at the Donana BiologicalStation in Seville, Spain, said the debate was wide open.
Quaint summerhouses dating back to the 1920s bring visitors to Rodd Island, a former biological research station nestled in Iron Cove near the Sydney suburb of Rozelle.
They attached new debris shields to the hull of the station's Russian segment, added support struts to an airlock ladder and retrieved a biological sample canister.
Take an optional tour of the Charles Darwin Research Station on Santa Cruz Island, where you can observe scientists from all over the world conducting biological research.