Latitudinal shifts in species interactions interfere with resistance of southern but not of northern bog-plant communities to experimental climate change
Article first published online: 7 OCT 2013
© 2013 The Authors. Journal of Ecology © 2013 British Ecological Society
Journal of Ecology
Volume 101, Issue 6, pages 1484–1497, November 2013
How to Cite
Schwarzer, C., Heinken, T., Luthardt, V., Joshi, J. (2013), Latitudinal shifts in species interactions interfere with resistance of southern but not of northern bog-plant communities to experimental climate change. Journal of Ecology, 101: 1484–1497. doi: 10.1111/1365-2745.12158
- Issue published online: 17 OCT 2013
- Article first published online: 7 OCT 2013
- Accepted manuscript online: 20 AUG 2013 04:00AM EST
- Manuscript Accepted: 14 AUG 2013
- Manuscript Received: 31 JAN 2013
- Ministerium für Wissenschaft, Forschung und Kultur Brandenburg
- University of Potsdam
- additive partitioning of biodiversity effects;
- ecosystem services;
- ecosystem stability;
- intraspecific divergence;
- multifactorial environmental change;
- nitrogen deposition;
- northern peatlands;
- Sphagnum magellanicum ;
- wetland ecosystems
- The persistence of species under changed climatic conditions depends on adaptations and plastic responses to these conditions and on interactions with their local plant community resulting in direct and indirect effects of changed climatic conditions. Populations at species' range margins may be especially crucial in containing a gene pool comprising adaptations to extreme climatic conditions. Many species of northern European bog ecosystems reach their southern lowland range limit in central Europe.
- In a common-garden experiment, we experimentally assessed the impact of projected climatic changes on five bog-plant species (including peat moss Sphagnum magellanicum) sampled along a latitudinal gradient of 1400 km from Scandinavia to the marginal lowland populations in Germany.
- Populations were cultivated in monocultures and in experimental communities composed of all five species from their local community, and exposed to five combinations of three climate treatments (warming, fluctuating water-tables, fertilization) in a southern common garden.
- Whereas most monocultures showed a decreasing biomass production from southern to northern origins under southern environmental conditions, in the experimental mixed-species communities, an increasing biomass production towards northern communities was observed together with a shift in interspecific interactions along the latitudinal gradient. While negative dominance effects prevailed in southern communities, higher net biodiversity effects were observed in northern subarctic communities.
- The combined effects of climate treatments increased biomass production in monocultures of most origins. In communities, however, overall the treatments did not result in significantly changed biomass production.
- Among individual treatments, water-table fluctuations caused a significant decrease in biomass production, but only in southern communities, indicating higher vulnerability to changed climatic conditions. Here, negative effects of climate treatments on graminoids were not compensated by the slightly increased growth of peat moss that benefited from interspecific interactions only in northern communities.
- Synthesis. We conclude that shifting interactions within multispecies communities caused pronounced responses to changed climatic conditions in wetland communities of temperate southern marginal, but not of northern subarctic origin. Therefore, future models investigating the impacts of climate change on plant communities should consider geographical variation in species interactions an important factor influencing community responses to changed climatic conditions.