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Climbers leave rare plants' genetic variation on the rocks
Date:5/3/2011

Rock climbers are having a negative impact on rare cliff-dwelling plants, ecologists have found. Writing in the British Ecological Society's Journal of Applied Ecology they say that in areas popular with climbers, conservation management plans should be drawn up so that some cliffs are protected from climbers.

The Northern Franconian Jura and the Swabian Alb are two of Germany's most important climbing areas but also the last European stronghold of the rare yellow whitlowgrass (Draba azoides) a small plant that lives on limestone cliffs where it forms cushion-like rosettes.

To find out how climbing in the area was affecting the plant, Frank Vogler and Christoph Reisch of the University of Regensburg compared the number and distribution of D. azoides on eight cliffs that had been climbed for at least the past 50 years with eight pristine, unclimbed cliffs of similar size and aspect. They also tested the plants' DNA to find out how climbers affected its genetic variation.

They found that on climbed cliffs, the plants were smaller and fewer in number on cliff faces but more frequent on the scree the broken rock fragments at the base of the cliffs.

According to Dr Reisch: "Climbing adversely affects these plants in a direct way. Abrasion by climbing ropes and using cracks and ledges as hand and footholds obviously lead to a decline in the species' abundance."

Genetic fingerprinting showed that compared with climbed cliffs, there were greater genetic differences between plants living at different heights on the pristine cliffs, meaning that by displacing plants the climbers are also moving their genes down the cliff. These genetic changes could, in the long-term, affect the plants' fitness to survive in an environment it has spent thousands of years adapting to.

"Seed dispersal is presumably enhanced by rock climbers. But climbers also remove and drop individual plants from cliff faces, causing a
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Contact: Becky Allen
beckyallen@ntlworld.com
44-122-357-0016
Wiley-Blackwell
Source:Eurekalert

Page: 1 2

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