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- W2017252444 abstract "ABSTRACT. 1 Body orientation and wing tilting in Hipparchia semele (L.) have been explained previously both by the need for shadow-minimization (crypsis hypothesis) and by the need to regulate body temperature (thermoregulation hypothesis). 2 This study tests the thermoregulation hypothesis by quantifying butterfly orientation in relation to sun position, using vector analysis, and correlating the data with ambient temperature and time of day. 3 During sunshine, Graylings tend to present a maximal wing area to the sun's rays when the ambient temperature is relatively low, and a minimal area when it is high ('sunning’and‘heat-avoiding’positions respectively). 4 On cool sunny days, butterflies adopt sunning positions throughout the day, whereas on warm sunny days they adopt sunning positions during the outlying periods and heat-avoiding positions in the middle period of the day. Correlations between wing exposure and both ambient temperature and time of day are statistically significant for warm sunny days. 5 During overcast weather, butterfly orientation is very variable and possibly random. 6 Analysis of sunny day data supports the thermoregulation hypothesis. This is discussed in relation to other known types of thermoregulatory behaviour observed in this species: stilting, shade-seeking, ground-hugging and shivering. 7 Conversely, the results do not support the crypsis hypothesis." @default.
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- W2017252444 date "1983-05-01" @default.
- W2017252444 modified "2023-10-01" @default.
- W2017252444 title "Orientation behaviour in the Grayling butterfly: thermoregulation or crypsis?" @default.
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- W2017252444 doi "https://doi.org/10.1111/j.1365-2311.1983.tb00493.x" @default.
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