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Seed Weight Variation and Differential Avian Dispersal in Blackberries Rubus ulmifolius

Pedro Jordano
Oikos
Vol. 43, No. 2 (Jul., 1984), pp. 149-153
Published by: Wiley on behalf of Nordic Society Oikos
DOI: 10.2307/3544762
Stable URL: http://www.jstor.org/stable/3544762
Page Count: 5
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Seed Weight Variation and Differential Avian Dispersal in Blackberries Rubus ulmifolius
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Abstract

Patterns of within- and between-crop variation in seed weight are described for a population of Rubus ulmifolius Schott in southern Spain. Broad variation in seed weight (1.1-4.9 mg) exists among clones; within-crop variation usually encompassed at least 1/3 of this range and accounted on average for 23% of the total population variance. The four main avian seed dispersers in the study area differ in the frequency distributions of seed sizes found in faecal samples analyzed, indicating that they actually disperse different portions of the seed size distribution. /// Описан характер весовых различий семян Rubus ulmifolius Schott. одного урожая и разных урожаев в южной Испании. Большие варияции веса семян (1, 1-4,9 мг) установлены в разных клонах. Различия семян одного урожая составляют по меньшей мере треть этого перепада и дают в среднем 23% общих популяционных вариаций. У четырех видов птиц, основных распространителей семян в исследованном участке, найдены различия частоты распределения семян разных размеров в пробах фекалий, что показывает, что они фактически распространяют разные размерные группы семян.

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