HYBRIDIZATION OF THE HABITAT
HYBRIDIZATION OF THE HABITAT
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DOI：
10.2307/2405610
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发表时间：
1948-01-01
期刊：
影响因子：
3.3
通讯作者：
ANDERSON, E
中科院分区：
文献类型：
--
作者：
ANDERSON, E
讨论了自然条件下杂种的稀有性。许多生物学家遇到它们，如果有的话，只有在栖息地受到严重干扰的地方。其中一个原因是第一代杂种与一个或两个亲本回交的频率比较高。这些个体的杂交祖先并不明显。通常缺乏明显不同的杂交分离是由生境造成的，因为分离的杂交世代（即，F2以外的一切都是由个体组成的，每一个个体都需要自己独特的栖息地来实现最佳发展。换句话说，分离的杂种面临着一个非分离的栖息地。在那些自然条件受到人类极大干扰而形成各种新的（竞争力较弱的）生境的地方，更多种类的杂种分离株可能能够生存。杂交虫群通常只能在“杂交生境”中生存。“虽然后者大部分是人类干预的结果，但在人类出现之前，当新的土地被不同的植物群开辟殖民地时，类似的情况也普遍存在。
The rarity of hybrids under natural conditions is discussed. Many biologists encounter them, if at all, only where the habitat has been greatly disturbed. One reason for this is the comparative frequency of back-crosses of the 1st generation hybrids to one or both parents. The hybrid ancestry of such individuals is not apparent. The usual lack of conspicuously different hybrid segregates is imposed by the habitat because the segregating hybrid generations (i.e., everything beyond the F2) consist of individuals each of which requires its own peculiar habitat for optimum development. In other words, the segregating hybrids are confronted with a non-segregating habitat. In places where man has so greatly disturbed natural conditions as to make various new (and less competitive) habitats a greater variety of hybrid segregates may be able to survive. It is concluded that hybrid swarms will usually survive only in "hybridized habitats." While most of the latter result from human intervention, similar conditions have prevailed in pre-human times when new lands were opened up to colonization by diverse floras.