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Family planning	8 April 2020
When are you able to reproduce? Though barnacle geese can lay a first clutch when they have returned to the breeding grounds for the second year, it is still not easy to reproduce in such a variable environment, affected by climate change. In this scientific paper, we have explored the age at first reproduction, where first reproduction is defined as seen with goslings. With smart modelling at the Centre of Biodiversity at the Norwegian University of Science and Technology in Trondheim, and based on a long term dataset of the Arctic Centre of the University of Groningen, we have been able to analyse age of first reproduction in the barnacle goose colony in Ny-Ålesund. The modelling included density dependence, spring onset, resighting and survival and showed that climate change advanced the age at first reproduction. The full article is open access here and below. Kate Layton-Matthews (PhD) joined the field work in 2016) and Mari Aas Fjelldahl came as a master student in 2017. All publications of Maarten Loonen can be downloaded here.

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