Adress:
Institutionen för ekologi, miljö och botanik
Stockholms universitet
Lilla Frescati
106 91 Stockholm
Rum: 530 D
Telefon: 08-16 12 02
E-post: johan.ehrlen@su.se
Fax: 08-16 55 25
Research interests
My research focuses on two main fields: plant-animal interactions and plant population dynamics. One important question that I study is how environmental context influences natural selection by pollinators, seed predators and herbivores on plant traits, such as flowering phenology. Another important research objective is to link plant demography and plant population dynamics to explicit environmental factors and use this information to make more realistic population models for organisms in changing environments.
Research projects
I am currently working with four more specific projects; (1) Selection on timing of reproduction in plants – antagonists, mutualists and community context, (2) Effects of climate change on trophic interactions – host plant utilization in butterflies, (3) Environmental change, genetic variation and viability of plant populations and (4) Modelling the effects of environmental and climate variation on plant population dynamics.
I currently supervise two Ph.D. students:
Teaching
I am coordinating the course “Plant Ecology and plant-animal interactions”. The course is given each year during the second half of the spring semester. For more information check http://sisu.it.su.se/search/info/BL8042/en.
I am also participating in the course “Ecology and Climate change” http://sisu.it.su.se/search/info/BL8052/en.
I am happy to suggest and supervise Master projects within the fields of plant animal interactions, plant life histories and plant population dynamics.
Publications
All publications
Selected publications
Ehrlén, J. & Münzbergova, Z. 2009. Timing of flowering - opposed selection on different fitness components and trait covariation. American Naturalist 173:819-830.
Kolb, A. & Ehrlén, J. 2010. Environmental context drives seed predator-mediated selection on a floral display trait. Evolutionary Ecology 24:433-445.
Arvanitis, L., Wiklund, C., Münzbergova, Z., Dahlgren, J. P. & Ehrlén, J. 2010. Novel antagonistic interactions associated with plant polyploidization influence trait selection and habitat preference. Ecology Letters 13:330-337.
Nicole, F, Dahlgren, J. P., Vivat, A., Till-Bottraud, I. & Ehrlén, J. 2011. Interdependent effects of habitat quality and climate on population growth of an endangered plant. Journal of Ecology 99:1211-1218.
Vanhoenacker, D., Ågren, J. & Ehrlén, J. 2013. Non-linear relationship between intensity of plant–animal interactions and selection strength. Ecology Letters, in press (DOI: 10.1111/ele.12029).
Hylander, K. & Ehrlén, J. 2013. The mechanisms causing extinction debts. Trends in Ecology & Evolution 28:341-346.
Von Euler, T., Ågren, J. & Ehrlén, J. 2013. Environmental context influences both the intensity of seed predation and plant demographic sensitivity to attack. Ecology in press.
