Dear colleagues,

this week's Biology Thursday seminar (11th Nov. 12:15, zoom link below) will be given by Dr. Noémie Pichon, University of Oulu, on:

"Warmer climate, nutrients and grazing mediate the effects of dispersal limitation on plant community diversity and productivity"

Dispersal limitation can lead to lower plant species richness and productivity than the potential maximum of natural communities. However, we know little about its long-term effects and how its importance might depend on global changes and trophic interactions. In a tundra ecosystem, we tested the effects of one-time seed addition on species richness and community biomass after 10 years, and how these effects depended on experimental warming, fertilisation, and herbivore exclusion. Species richness was higher in seeded plots compared to controls, irrespective of the experimental manipulations. Seed addition increased community biomass in ambient conditions (grazed plots without warming and fertilisation), and in communities simultaneously warmed and fertilised. In addition, herbivore exclusion drove a shift in seeded species composition from tundra to lowland species dominance. These results highlight that the importance of dispersal limitation for community assembly processes can be altered by global changes and herbivory, with consequences for ecosystem functioning.

See you online on Thursday,

Heikki

Heikki Helanterä is inviting you to a scheduled Zoom meeting.

Topic: Biology Thursday seminar Time: This is a recurring meeting Meet anytime

Join Zoom Meeting https://oulu.zoom.us/j/62917763539?pwd=WENZRy9Bb3NlSzlyeVlVamJ4RHR5Zz09

Meeting ID: 629 1776 3539 Passcode: 166151

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=============================================== Heikki Helanterä Associate Professor (tenure track) Ekologian ja genetiikan tutkimusyksikkö / Ecology and Genetics Research Unit Oulun Yliopisto / University of Oulu / Finland heikki.helantera@oulu.fimailto:heikki.helantera@oulu.fi +358-40-7507 334