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They found that the frequency of C.?rotundifolia had declined by 25% in the area of highest nitrogen deposition, and the correlation between decline and nitrogen deposition was highly significant. The temperature range of C.?rotundifolia is very broad and the occurrence of C.?rotundifolia at northerly latitudes is testament to its frost hardiness. It will often flower late in the year, up to the first hard frost. Though, at least in the British Isles, C.?rotundifolia is usually thought of as a plant of dry places (Clapham, Tutin & Moore 1987), there are indications that the species is excluded from some habitats by water stress and Hill et?al. (1999) record it as being intermediate between being a dry and moist site indicator http://www.selleckchem.com/products/Bortezomib.html (Ellenberg http://www.selleckchem.com/products/sch772984.html value 4). Droughted plants often have a stunted erect habit and produce small flowers with protruding stigmas (McAllister 1972), so it is possible to identify drought stressed plants in the field (these characters are not maintained in cultivation). The main types of dry habitat colonized by C. rotundifolia are poor grasslands on light sandy soils and dry crevices in cliffs and dry-stone walls. In all such situations the plant��s long tap root may enable it to access deeper water supplies than its shallower rooted competitors such as grasses. Such habitats become very dry in long summer droughts and the vegetation frequently becomes brown and parched. In all such situations examined, the C.?rotundifolia plants remained green though often wilted. The species�� ability to cope with drought was highlighted in a long-term drought experiment on shallow calcareous soil (Buxton, UK), in which C.?rotundifolia showed little response to repeated summer drought and winter warming (Fridley et?al. 2011) and persisted as a subordinate under http://www.selleck.cn/products/gdc-0068.html a wide range of environmental conditions. In tests of the ecological effects of heather burning in Scottish moorland Mallik & Gimingham (1985) found that C.?rotundifolia can regenerate from underground perennating organs which escape the effects of fire. Campanula rotundifolia is morphologically highly variable. Observations on reference material of known ploidy level show that the more delicate plants with paniculate inflorescences, thin pedicels, small (
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