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Fig. 1 | BMC Zoology

Fig. 1

From: The influence of night length: Activity of the northern bat Eptesicus nilssonii under conditions of continuous light in midnight sun compared to a southern population

Fig. 1

Distribution of a) roost exits and b) roost returns by the northern bat during the night across the whole season. Recordings made by visual counts from mid-June to the end of September at all roosts in Troms (including Løvhaug). Distribution of northern bat passes during the night across the season. c) Recordings made by IR detection in three summers (mid-June to early September) at the roost Løvhaug (a few records from September and October are not included). d) Ultrasound recordings (late June to the end of September) in Troms. The lower dashed line represents sunset, the upper represents sunrise and the central represents the sun at its lowest angle. Note that many points are superimposed

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