You are not currently logged in.
Access JSTOR through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Adaptations and Origins of Alpine Plants
W. D. Billings
Arctic and Alpine Research
Vol. 6, No. 2 (Spring, 1974), pp. 129-142
Published by: INSTAAR, University of Colorado
Stable URL: http://www.jstor.org/stable/1550081
Page Count: 14
You can always find the topics here!Topics: Plants, Flora, Species, Alpine plants, Billing, Vegetation, Growing seasons, Taxa, Evolution, Deserts
Were these topics helpful?See something inaccurate? Let us know!
Select the topics that are inaccurate.
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
Alpine environments are characterized by short, cold, unpredictable growing seasons. Outside of the Arctic this growing season is characterized by cold nights as well. Alpine plant adaptations are much like those of the Arctic in morphological and physiological characteristics. However, they appear to acclimate metabolically to changes in temperature more easily than do arctic ecotypes. In fact, almost all representatives of arctic-alpine species are ecotypically different from their congeners in the Arctic. This is particularly true in reproduction and metabolism, the real heart of adaptation to cold alpine environments. While there are relatively ancient alpine plant taxa, the accelerated rise of new mountain ranges in late Pliocene and Pleistocene times has led to new floristic aggregations in alpine vegetations by migration and adaptive radiation. Fluctuations in Pleistocene glaciations have alternately allowed migrations and blocked them. Interglacial refugia may be more important than glacial refugia in consolidating evolutionary changes in alpine taxa which evolve in response to decreasing temperatures, increasing light intensities, and in some cases to increasing drought stress.