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SUMMARY

It has been demonstrated that the decrease of temperature associated with an increase in altitude of 250 m is sufficient to reverse the outcome of competition between Sedum rosea (L.) Scop, and S. telephium L. ssp. fabaria Syme.

Growth analyses of S. rosea and S. telephium in a range of temperature conditions have shown that the change in the outcome of competition is due to the marked increase in growth of 5. telephium and the insensitivity of s. rosea to an increase in temperature over the range recorded in the field.