Evidence for life history changes in high-altitude populations of three perennial forbs.

@article{Arx2006EvidenceFL,
  title={Evidence for life history changes in high-altitude populations of three perennial forbs.},
  author={G. von Arx and P. Edwards and H. Dietz},
  journal={Ecology},
  year={2006},
  volume={87 3},
  pages={
          665-74
        }
}
Relatively little is known about how the life histories of perennial forb species, and especially their lifetime patterns of growth, vary across environmental gradients. We used a post hoc approach (herb-chronology) to determine plant age and previous growth (width of successive annual rings in roots) in three species of perennial forb (two long-lived species [Penstemon venustus, Lupinus laxiflorus] and one short-lived [Rudbeckia occidentalis]) along a 1000-m altitudinal gradient in the Wallowa… Expand
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Growth rings in the roots of temperate forbs are robust annual markers.
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