Dramatic decline of northern bat Eptesicus nilssonii in Sweden over 30 years

Jens Rydell, Marcus Elfstrom & Sonia Sanchez-Navarro
We monitored northern bat Eptesicus nilssonii (Keyserling & Blasius, 1839) acoustically along a 27 km road transect at weekly intervals in 1988, 1989, and 1990, and again in 2016 and 2017. The methodology of data collection and the transect were the same throughout, except that the insect-attracting mercury-vapour streetlights along parts of the road were replaced by sodium lights between the two survey periods. Counts along sections of the transect with and without streetlights were...
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These counts follow the COUNTER Code of Practice, meaning that Internet robots and repeats within a certain time frame are excluded.
What does this mean?