Johanna Hedlund

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Johanna Hedlund


PhD student in ethology with special interest in behavioural ecology. Before my PhD studies I worked as a consultant in ecology in Paris and I have also participated in field studies on Colobus monkeys, arctic fox, mezereon and C. corrugatum.


+46 8 15 95 22
Visiting address:
Svante Arrheniusväg 18 B
D 546
Postal address:
Stockholm University
106 91 Stockholm

Research interests

My PhD studies at Stockholm University are focusing on climate change effects on behaviour, ecology and life-history characters of the willow warbler (Phylloscopus trochilus), a long-distance migrant wintering in sub-Saharan Africa and with a breeding distribution including most of Sweden.

Specific projects include:
i) investigating how timing of willow warbler migration, both during spring and autumn, and egg-laying have changed during the last 20-30 years at different latitudes within Sweden
ii) investigating patterns of return rates (philopatry) in the willow warbler at different latitudes within Sweden
iii) investigating spring migration arrival difference between males and females (protandry) over time in relation to climate change in the willow warbler
iv) using historic maps and remote sensing to investigate how past, present and future land-use change has altered the habitat conditions for the willow warbler and the chaffinch (Fringilla coelebs)



Johanna S. U. Hedlund, Frida Sjösten, Kristaps Sokolovskis, Sven Jakobsson. 2017. Point of no return – absence of returning birds in the otherwise philopatric willow warbler Phylloscopus trochilus. Journal of Avian Biology 48: 399-406.

Johanna S. U. Hedlund, Sven Jakobsson, Cecilia Kullberg, Thord Fransson. 2015. Long-term phenological shifts and intra-specific differences in migratory change in the willow warbler Phylloscopus trochilus. Journal of Avian Biology 46: 97-106.

Cecilia Kullberg, Thord Fransson, Johanna Hedlund, Niclas Jonzen, Ola Langvall, Johan Nilsson, Kjell Bolmgren. 2015. Change in spring arrival of migratory birds under an era of climate change, Swedish data from the last 140 years. Ambio 44: S69-S77.

Bodil Elmhagen, Georgia Destouni, Anders Angerbjörn, Sara Borgström, Emily Boyd, Sara A. O. Cousins, Love Dalen, Johan Ehrlén, Matti Ermold, Peter A. Hambäck, Johanna Hedlund, Kristoffer Hylander, Fernando Jaramillo, Vendela K. Lagerholm, Steve W. Lyon, Helen Moor, Björn Nykvist, Marianne Pasanen-Mortensen, Jan Plue, Carmen Prieto, Ype van der Velde, Regina Lindborg. 2015. Interacting effects of change in climate, human population, land use, and water use on biodiversity and ecosystem services. Ecology & society 20.

Other academic

Johanna Hedlund. 2015. Climate change effects on migratory birds and on the ecology and behaviour of the willow warbler (Phylloscopus trochilus). Doctoral thesis. Department of Zoology, Stockholm University.

Johanna Hedlund. Spatio-temporal perspectives on the effects of land use change on two common bird species: the past, present and future.

Johanna Hedlund. Regional differences in phenological response to climate change in willow warblers (Phylloscopus trochilus).

Johanna Hedlund. Point of no return – absence of returning birds in the philopatric willow warbler (Phylloscopus trochilus).