This is the pre-peer reviewed version of the following article:
Ruete A, Pärt T, Berg Å, Knape J. Exploiting opportunistic observations to estimate changes in seasonal site use: An example with wetland birds. Ecol Evol. 2017;00:1–13. https://doi.org/10.1002/ece3.3100
which has been published in final form at Ecology and Evolution. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
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