GEIGERIA ALATA IN THE NAMIB DESERT - SEED HETEROMORPHISM IN AN EXTREMELY ARID ENVIRONMENT

被引：14

作者：

BURKE, A ^{[1
]}

机构：

[1] DESERT ECOL RES UNIT NAMIBIA,SWAKOPMUND,NAMIBIA

来源：

JOURNAL OF VEGETATION SCIENCE | 1995年 / 6卷 / 04期

关键词：

ARIDITY GRADIENT; POLYMORPHIC BEHAVIOR; SEED DISPERSAL; SEED PRODUCTION; TUMBLE WEED;

D O I：

10.2307/3236345

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Seed heteromorphism in annual Geigeria alata in the Namib Desert was investigated in relation to environmental conditions. Geigeria alata shows heteromorphism in seed dispersal distance depending on the position of the seeds on the parent plant. Seeds produced in capitula on branches (aerial) travel long distances, while seeds produced at the base of the plant remain in the vicinity of the parent plant. The ratio of aerial to basal seed production was investigated under different environmental conditions following an aridity gradient. Although there were significant differences in seed and capitula production between seasons and between different positions on the plant, no overall trend was found with increasing aridity.

引用

页码：473 / 478

页数：6

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