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• W2065514850 abstract "1 Although fossil pollen from forest hollows (~ 5 m in diameter) is often interpreted as a record of stand-scale forest changes, this assumption has not previously been tested by comparing pollen percentages in modern sediment to vegetation from a range of sampling radii. I compared pollen in surface sediment with distance-weighted basal area of trees in radii from 10 to l00 m, to test a model (Sugita 1994) that predicts the 'relevant pollen source area' for forest hollows is 50-100 m, and that about 40 % of the pollen comes from trees growing within this radius. 2 Maximum likelihood estimates of pollen productivity, based on the relevant source area, are used to test for differences in species pollen productivity between a pinedominated region in north-western Wisconsin, and a hemlock-northern-hardwoodsdominated region of upper peninsula Michigan. 3 Likelihood function scores, which measure the goodness-of-fit of the pollen-vegetation relationship based on the maximum likelihood method, show that estimates of pollen productivity (ac) and relative background pollen loading (co) improve as radius of distance-weighted vegetation sampling increases from 10 to 50 m. There is little further improvement from 50 to lOOm. Linear regression analysis of pollen percentages on distance-weighted basal area also shows little improvement in pollenvegetation correlation when vegetation samples from beyond 50 m are included. Predictions of pollen percentages therefore are not improved by increasing the vegetation sampling radius beyond 50-100 m. These results support Sugita's (1994) model prediction and confirm that fossil pollen in hollows records stand-scale vegetation heterogeneity at a scale of 50-lOOm. 4 Estimates of background pollen (co) indicate that on average, only 40-50% of the pollen in forest hollows comes from trees growing within 50-lOOm of the hollow. However, this is sufficient to record the stand scale vegetation heterogeneity because larger areas of vegetation are recorded as homogeneous regional background, even in patchy vegetation. 5 Relative pollen productivity of three monospecific pollen taxa (red maple, sugar maple, basswood) is similar for two regions, supporting the implicit assumption in palynology that pollen productivity is a species-specific constant. Productivity estimates of birch are similar between regions, although yellow birch dominates in one region and paper birch in the other." @default.
• W2065514850 created "2016-06-24" @default.
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• W2065514850 date "1995-08-01" @default.
• W2065514850 modified "2023-10-16" @default.
• W2065514850 title "Pollen Source Area and Pollen Productivity: Evidence from Forest Hollows" @default.
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• W2065514850 doi "https://doi.org/10.2307/2261627" @default.
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