Population differentiation in Agrostis tenuis sibth. III. Populations in varied environments
Population differentiation in Agrostis tenuis sibth. III. Populations in varied environments
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DOI：
10.1111/j.1469-8137.1960.tb06206.x
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发表时间：
1960-01-01
期刊：
影响因子：
9.4
通讯作者：
BRADSHAW, A. D.
中科院分区：
文献类型：
--
作者：
BRADSHAW, A. D.
为了研究一个物种内发生的生理分化，60个分蘖的数量群体的剪股颖的样本移植到实验区建立在不同的对比自然栖息地附近的阿伯里斯特威斯在威尔士中部。两个种群也生长在铅污染的土壤上。在不同的环境下，他们的表现进行了检查。结果发现：（1）来自不同生境的种群在忍受不同极端条件的能力上有很大差异。例如，冬季条件严重影响了高地样地中低地种群的生长，而盐雾则影响了沿海样地中高地种群的生长。来自铅矿的种群能够在铅污染的土壤中生长，而来自普通牧场的种群则不能。每个种群的行为总是与种群起源的环境有关。(2)这些差异也被发现，虽然在较小的规模，人口之间的对比度较小的环境。(3)来自栖息地只有很短的距离，在这些情况下，原来的栖息地显着不同的表现有很大的差异。(4)这种生理分化不一定伴随着形态分化。这很可能是因为这两种类型的分化与环境中不相关的因素有关。结果表明，生理分化模式是一个类似于先前描述的形态分化模式的分级拼凑。|| 摘要编辑：作者
In order to investigate the physiological differentiation occurring within a species, samples of 60 tillers of a number of populations of Agrostis tenuis were transplanted into experimental plots established in various contrasting natural habitats in the neighborhood of Aberystwyth in central Wales. Two populations were also grown on lead-contaminated soil. Their performance under the different environments was examined. It was found that: (1) Populations originating from contrasting habitats differed considerably in their ability to tolerate different extreme conditions. For instance, the growth of lowland populations in the upland plot was seriously affected by winter conditions, and the growth of upland populations in the coastal plot affected by salt storm spray. The population from a lead mine was able to grow in lead-contaminated soil, while the population from normal pasture was not. The behavior of each population could always be related to the environment from which the population originated. (2) These differences were also found, although on a smaller scale, between populations originating from less contrasting environments. (3) Populations originating from habitats only a short distance apart showed considerable differences in performance in those cases where the original habitats were marked different. (4) Such physiological differentiation was not necessarily accompanied by morphological differentiation. It is likely that this is because the two types of differentiation are in relation to unrelated factors of the environment. It was concluded that the pattern of physiological differentiation was a graded patchwork similar to the pattern of morphological differentiation previously described. || ABSTRACT AUTHORS: Author