Dambly, L.I., Jones, K.E., Boughey, K.L. & Isaac, N.J.B. (2021) Observer retention, site selection and population dynamics interact to bias abundance trends in bats. Journal of Applied Ecology, 58, 236–247.
Abundance trends
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Brereton, T.M., Roy, D.B., Middlebrook, I., Botham, M.S. & Warren, M.S. (2011) The development of butterfly indicators in the United Kingdom and assessments in 2010. Journal of Insect Conservation, 15, 139–151.