Impacts of Warming on Reproductive Output of a Forest Herb
De Frenne, P., Graae, J.J., Kolb, A., Brunet, J., Chabrerie, O., Cousins, S.A.O., Decocq, G., Dhondt, R., Diekmann, M., Eriksson, O., Heinken, T., Hermy, M., Jogar, U., Saguez, R., Shevtsova, A., Stanton, S., Zindel, R., Zobel, M. and Verheyen, K. 2010. Significant effects of temperature on the reproductive output of the forest herb Anemone nemorosa L. Forest Ecology and Management 259: 809-817.
Based on their analysis, the authors report that "seed mass, germination percentage, germinable seed output and seedling mass all showed a positive response to increased GDH experienced by the parent plant," noting that seed and seedling mass increased by 9.7% and 10.4%, respectively, for every 1000 °C-hours increase in GDH, which they say is equivalent to a 1°C increase in temperature over a 42-day period.
The nineteen researchers -- hailing from Belgium, Estonia, France, Germany and Sweden -- concluded that "if climate warms, this will have a pronounced positive impact on the reproduction of A. nemorosa, especially in terms of seed mass, germination percentage and seedling mass," because "if more seeds germinate and resulting seedlings show higher fitness, more individuals may be recruited to the adult stage." In addition, they say that since "rhizome growth also is likely to benefit from higher winter temperatures (Philipp and Petersen, 2007), it can be hypothesized that the migration potential of A. nemorosa may increase as the climate in NW-Europe becomes warmer in the coming decades." And increasing migration potential implies decreasing extinction potential.
Philipp, M. and Petersen, P.M. 2007. Long-term study of dry matter allocation and rhizome growth in Anemone nemorosa. Plant Species Biology 22: 23-31.