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单词 Ring species
释义

Ring species

中文百科

环物种

从一极端到另一极端之间的各族群都有连续性的基因变化，但彼此相邻的两族群之间仍能互相杂交；但当此一族群的首尾两亚种重新相遇时，已差异太大而无法杂交。
银鸥在北极圈形成环物种，各相邻亚种间可以杂交，但北欧亚种和英国亚种无法杂交。
暗绿柳莺各亚种分布，其中东西伯利亚亚种与西西伯利亚亚种无法杂交。

环物种是指生物学中一个物种因地理区隔（如湖泊、山岳、峡谷）等因素而沿着该区隔繁衍产生多个亚种，各相邻亚种之间有着连续性的基因变化，当此一连续亚种之首尾物种亦相邻，首尾两亚种却因差异太大而不进行杂交繁殖的现象。此物种整体分布型态正如一圆环状，故名为“环物种”。

环物种展现了临域性物种形成的一个过程，也成为物种演化的证据。

英语百科

Ring species 环物种

The coloured bars show a number of natural populations, each population represented by a different colour, varying along a cline (a gradual change in conditions which gives rise to slightly different characteristics predominating in the organisms that live along it). Such variation may occur in a straight line (for example, up a mountain slope) as is shown in A, or may bend right around (for example, around the shores of an ocean), as is shown in B. In the case where the cline bends around, populations next to each other on the cline can interbreed, but at the point that the beginning meets the end again, as is shown in C, the differences that have accumulated along the cline are great enough to prevent interbreeding (represented by the gap between pink and green on the diagram). The interbreeding populations in this circular breeding group are then collectively referred to as a ring species.
The Larus gulls interbreed in a ring around the arctic. 1: L. fuscus, 2: Siberian population of Larus fuscus, 3: L. heuglini, 4: L. vegae birulai, 5: L. vegae, 6: L. smithsonianus, 7: L. argentatus.
Herring gull (Larus argentatus) (front) and a lesser black-backed gull (Larus fuscus) (behind) in Norway: two phenotypes with clear differences
Speculated evolution and spread of the greenish warbler.   P. t. trochiloides   P. t. obscuratus   P. t. plumbeitarsus   P. t.

In biology, a ring species is a connected series of neighbouring populations, each of which can interbreed with closely sited related populations, but for which there exist at least two "end" populations in the series, which are too distantly related to interbreed, though there is a potential gene flow between each "linked" population. Such non-breeding, though genetically connected, "end" populations may co-exist in the same region thus closing a "ring". The German term Rassenkreis, meaning a ring of populations, is also used.
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更新时间：2025/6/19 7:30:53