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Thermoregulatory behaviour of Sympetrum striolatum at low temperatures with special reference to the role of direct sunlight (Odonata: Libellulidae)

“…The aeshnid fliers Aeshna juncea (Linnaeus, 1758) and A. subarctica Walker, 1908 adopt the same posture for warming-up when they are basking on tree trunks. This posture has been described or figured also by other authors ( e.g ., Shimizu 1992: Sympetrum croceolum [Selys, 1883]; Sternberg 1997: Aeshna caerulea [Ström, 1783]; May 1998: Sympetrum vicinum ; Wildermuth 2012: A. caerulea ; Wildermuth & Martens 2019: Aeshna serrata Hagen, 1856). Another posture to gain heat in some libellulid perchers is the warm-up obelisk described and discussed in Wildermuth et al .…”