Continental-scale interactions with temporary resources may explain the paradox of large populations of desert waterbirds in Australia

Arid Australia supports extraordinary numbers of waterbirds. We show that t he solution to this seeming paradox lies in considering the availability of temporary wetland habitat in the context of the birds dispersal capability and fluctuations in the abundance of wetlands in time and space. For speci es with large dispersal capabilities, the Lake Eyre Basin of central Austra lia, amongst the driest regions on the continent, has the highest habitat a vailability for waterbirds. Analyses of landscape structure show that the w etlands of the Lake Eyre Basin are highly interconnected and linked by broa d pathways to wetter parts of south-eastern Australia. These analyses illus trate that organism traits and patch dynamics affect realised habitat avail ability and indicate that the processes that structure populations may oper ate at much larger spatial scales than those at which humans usually seek t o manage the landscape.