Scale-dependent thermal tolerance variation in Australian mountain grasshoppers

摘要: Physiological variation among and within species is thought to play a key role in determining distribution patterns across environmental gradients. We tested inter- intraspecific cold heat tolerances for three grasshopper (genus Kosciuscola) with overlapping elevation distributions, their respective ranges the Australian mountains. Of tolerance traits measured, critical thermal minimum was only trait vary species, greater associated extending higher elevation. Cold limits were regularly exceeded exposed microhabitats, suggesting adaptation structuring patterns. In contrast tolerance, primarily partitioned species. For two populations from treeless alpine habitat more tolerant than lower-elevation counterparts, supporting recent models that suggest exposure temperature extremes at elevations. These contrasting of physiological emphasise importance considering when attempting understand how distributions are affected by extremes.