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Hik, D. S.

1 We measured leaf births, leaf deaths and leaf length of three alpine perennial species, Kobresia myosuroides [Pacific bog sedge], Erigeron humilis [Arctic alpine fleabane] and Oxytropis nigrescens [black locoweed], from sites with different grazing histories (strong or weak) in response to two levels of current season grazing (present or absent) by collared pikas (Ochotona collaris), a small lagomorph, in the south-west Yukon. 2 All three species appeared to tolerate the removal of 58-61% of summer leaf production under natural conditions. Grazing history, which was defined by the location of plants located either 6 m from boulderfields with a history of occupation by pikas, was the most significant factor determining...
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