The effects of water on patch use by two Simpson Desert granivores (Corvus coronoides and Pseudomys hermannsburgensis)

摘要: Water loss while foraging may affect the overall value of food to desert animals. When water is scarce, foragers alter activity and shun certain types due elevated loss. abundant, can exploit patches more thoroughly remain active over a broader range ambient conditions. In short, be complementary resources. The presence raises marginal food, particularly those foods low in content. We tested for complementarity at sand dune site Simpson Desert arid Australia. To do so, we quantified patch exploitation or absence bowls filled with water. order quantify use, provisioned feeding trays granulated peanuts mixed into substrate. these measured giving-up densities (GUD; amount left tray after bout) diurnal (mostly Australian ravens, Corvus coronoides) nocturnal sandy inland mouse, Pseudomys hermannsburgensis). affected GUD ravens but not rodents. For dropped about 50% response added are strongly complementary. addition, had lower open than bush microhabitat, bottom tops dunes.