Avian functional group responses to rainfall across four vegetation types in the Simpson Desert, central Australia

摘要: Temporal and spatial variability in rainfall subsequent resource flows often drive large changes bird demography the structure of avian assemblages arid regions. Here, we describe broad functional group responses to across four vegetation classes Simpson Desert, central Australia, over a period when both dry wet conditions prevailed. Birds were surveyed eucalypt woodlands, gidyea mixed Acacia (mulga) shrublands spinifex-dominated hummock grasslands this region between 2006 2008 using spatially nested hierarchical sampling design with fixed radius point counts as replicates. Predictably, composition communities varied well time. Generalist feeders insectivorous birds dominated during periods, whereas granivorous species most abundant widespread following heavy rains. Carnivores specialist nectarivores responded variably throughout regardless habitat. The dynamics granivores especially interesting; numbers nomadic moved into study area response rainfall, highlighting key role for shaping community structure. This represents first attempt investigate differing types variable but low productivity landscape. findings confirm that is temporally dynamic, prompt further investigation roles habitat limitation play defining Australia.