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Fig. 1 | Frontiers in Zoology

Fig. 1

From: Bat population recoveries give insight into clustering strategies during hibernation

Fig. 1

Number of hibernating bats in the Bull Rock Cave, Czech Republic, from 1977 to 2018. aMyotis myotis. bRhinolophus hipposideros. Dashed line = least-squares estimate of the exponential growth model (Eq. 1), solid line = maximum likelihood estimate of the exponential growth model corrected for winter severity and winter duration up to the survey. a = initial population size, b = exponential growth parameter, aw and bw = intercept and slope for the influence of winter severity on growth model residuals. c Regional winter severity and survey dates over the course of the study. Solid line = accumulated winter season severity index (AWSSI) for the region, points = survey dates. d Seasonal air temperature inside the Bull Rock Cave from November 2008 to March 2010 (coloured lines, data from [46]) and daily average temperature outside reported by the Tuřany meteorological station (dotted line). Grey rectangles show winter seasons as estimated from the AWSSI calculation

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