Field sampling
We carried out daily CMR between 6th June and
24th July, 2020 from 11:00 to 17:00 by capturing
mature individuals with hand nets and marking them with a permanent
marker on the hind wing. Two observers continuously walked across the
study site to capture unmarked individuals and tag recovery. Before
releasing individuals at the point of capture, hind wing length
(surrogate of body size) was measured with an electronic caliper to the
nearest 0.01 mm. We used two resighting methods: (1) conventional
observations with the naked eyes (CV), and (2) high-speed videos using
the Sony RX10 Mark4 with 250 fps high-frame-rate mode, which is 8-10
times more frames than normal cameras (allowing to slow the motion 8-10
times). The videos were later visualized for identifying the individual
code (Fig. 1). We asked how the use of a high-speed camera increases the
number of resightings relative to conventional observations alone, and,
further, whether inclusion of camera data can improve estimates of
survival and accompanying covariates (age and body size).