Adaptation to variation in growing season length in arctic populations of Saxifraga oppositifolia L.
Adaptation to variation in growing season length in arctic populations of Saxifraga oppositifolia L.
复制标题
北极虎耳草种群对生长季节长度变化的适应。
DOI：
10.1080/03746609508684828
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
L. C. Smith
中科院分区：
文献类型：
--
作者：
R. Crawford;H. Chapman;L. C. Smith
摘要 在高纬度地区，虎耳草存在着适应生长季节长度差异的独特生态型。在积雪晚和寒冷的地区，潮湿的土壤提高了新陈代谢率，快速的芽生产弥补了超短的生长季节，但不能在不利时期保存碳水化合物或水。对于生活在较早恢复生长的地区的生态型来说，相反的策略是明显的，这些地区的土壤更温暖、更干燥，生长季节更长。这里的新陈代谢率较低，因此保存碳水化合物和水的能力更强。在温暖和寒冷的栖息地中生存的相反策略的存在表明，即使在北极高纬度的最低热条件下，高度的生物多样性也为整个物种提供了广泛的生态幅度。这种程度的多样性不仅增加了物种生存的场所，而且通过改变生态型频率以适应气候变化，赋予了物种适应气候变化的能力。
Summary At high latitudes Saxifraga oppositifolia exists with distinct ecotypes adapted to differences in growing season length. In areas with late snow-lie and cold, wet soils increased metabolic rates and rapid shoot production compensate for ultra-short growing seasons but do not conserve carbohydrate or water for adverse periods. An opposing strategy is evident in ecotypes living in sites with an earlier resumption of growth where soils are warmer and drier and the growing season longer. Here metabolic rates are lower and result in a greater ability to conserve both carbohydrate and water. The existence of opposing strategies for survival in warm and cold habitats, suggests that even in the minimal thermal conditions of the high Arctic a high degree of biodiversity gives the species as a whole a wide ecological amplitude. This degree of diversity not only increases the sites in which the species can survive but confers an ability to adapt to climate change by changing ecotype frequencies to accommodat...