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
Brereton, T.M., Warren, M.S., Roy, D.B. & Stewart, K. (2008) The changing status of the Chalkhill Blue butterfly Polyommatus coridon in the UK: the impacts of conservation policies and environmental factors. Journal of Insect Conservation, 12, 629-638.
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.