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- W1987373492 abstract "1.|The robber flies Machimus occidentalis and Machimus formosus are ambush predators that occur sympatrically in grassland habitats of southwestern Montana, U.S.A., although the former occurs earlier in the season. 2.|Early in daily foraging periods, when ambient temperatures are relatively low, the two species exhibited similar behaviours. They perched in a crouched posture on fully insolated bare soil surfaces and oriented their longitudinal and dorsoventral axes to maximize the incident solar radiation intercepted by the broad lateral surface of the thorax. Measurements of operative body temperature of flies in different locations, orientations, and postures indicate that such basking can significantly raise body temperature. 3.|Their thermoregulatory tactics diverged as daily temperatures and solar radiation loads rise. 4.|Like previous grassland species studied, M. occidentalis moved upward onto vegetation, where crouched postures and orientation to the sun disappeared. 5.|Machimus formosus, on the other hand, took refuge in the shaded portions of ground squirrel (Citellus sp.) and badger (Taxidea taxus) burrows. 6.|In both cases, the vertical movements resulted in lower body temperatures than would occur if flies remained on the fully insolated soil surfaces. 7.|We compare the tactics of these two species with those of previous grassland species studied." @default.
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- W1987373492 date "1992-11-01" @default.
- W1987373492 modified "2023-10-16" @default.
- W1987373492 title "Behavioural thermoregulation in two species of robber flies occupying different grassland microhabitats" @default.
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- W1987373492 doi "https://doi.org/10.1016/0306-4565(92)90041-d" @default.
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