Probing Ecosystem Resilience to Climate Change in Arctic-Alpine Plants
de Witte, L.C., Armbruster, G.F.J., Gielly, L., Taberlet, P. and Stocklin, J. 2012. AFLP markers reveal high clonal diversity and extreme longevity in four key arctic-alpine species. Molecular Ecology 21: 1081-1097.
In discussing their findings De Witte et al. report that "the oldest genets of D. octopetala, S. herbacea and V. uliginosum were found to be at least 500, 450 and 1400 years old, respectively," but they say that "the largest C. curvula genet had an estimated minimum age of c. 4100 years and a maximum age of c. 5000 years, although 84.8% of the genets in this species were <200 years old."
The French and Swiss scientists say their results indicate that "individuals in the studied populations have survived pronounced climatic oscillations, including the Little Ice Age and the postindustrial warming," and they note that "the presence of genets in all size classes and the dominance of presumably young individuals suggest repeated recruitment over time," which they say is "a precondition for adaptation to changing environmental conditions." Therefore, they conclude that, acting together, "persistence and continuous genet turnover may ensure maximum ecosystem resilience," noting that their results indicate that "long-lived clonal plants in arctic-alpine ecosystems can persist, despite considerable climatic change," and that they "may indeed show a previously underestimated resilience to changing climatic conditions." In fact, they say their findings suggest that "moderate climate change with an average temperature increase of 1.8°C over the next hundred years and a moderate frequency of extreme climatic events will not lead to local extinctions of long-lived clonal plant populations [italics added]."
Grabherr, G. and Nagy, L. 2003. Alpine vegetation dynamics and climate change: a synthesis of long-term studies and observations. In: Nagy, L., Grabherr, G., Korner, C. and Thompson, D.B.A. (Eds.). Alpine Diversity in Europe, Springer-Verlag, New York, New York, USA, pp. 399-409.
Guisan, A. and Thuiller, W. 2005. Predicting species distribution: offering more than simple habitat models. Ecology Letters 8: 993-1009.
Korner, C. 2003. Alpine Plant Life: Functional Plant Ecology of High Mountain Ecosystems. Springer-Verlag, Berlin, Germany.
Steinger, T., Korner, C. and Schmid, B. 1996. Long-term persistence in a changing climate: DNA analysis suggests very old ages of clones of alpine Carex curvula. Oecologia 105: 94-99.