Population monitoring
Populations in the landscapes were monitored by taking three photos in
quick succession of each habitat patch once every week. These pictures
were then used to count individuals within each patch using Fiji
software (Schindelin et al. 2012), a background subtraction method to
determine which individuals are alive by comparing which have moved
between the three photos (Mallard et al. 2013). Due to limitation in the
quality of the photos taken we were only able to count individuals
larger than 0.2mm in length, equal approximately to the size of
individuals at eclosion (Johnson and Wellington 1983).