Species rank is also indicated by the lack of indications of clinal variation or intergradation, despite direct evidence of dispersal. |
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Data to support our first hypothesis will come from examining museum specimens collected from areas that are far from the edge of intergradation with any other subspecies. |
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That intergradation was inferred from only two intermediate specimens. |
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The extensive intergradation that has resulted from interbreeding is the chief cause of classification difficulties. |
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He called for deeper intergradation to achieve more unified GCC accomplishments. |
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Its eastern limit in Russia is hard to define, due to extensive hybridisation and intergradation with the Siberian spruce, but is usually given as the Ural Mountains. |
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