peripheral sink

peripheral sink

[pə′rif·ə·rəl ′siŋk]
(geology)
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The question of geographic clines in age structure is more difficult to address with the available correlative data, Subtle changes in sampling procedure associated with elevation may result in minor variation in observed age ratios, but as I have suggested, the bulk of the regional variance may be caused by the dispersal of yearlings from source populations (high relative abundance) along the Appalachian axis to peripheral sink populations (low relative abundance).

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