Fragment size, pollination efficiency and reproductive success in natural populations of wind-pollinated Polylepis australis (Rosaceae) trees

被引:26
作者
Seltmann, Peggy
Renison, Daniel
Cocucci, Andrea
Hensen, Isabell
Jung, Klaus
机构
[1] Univ Halle Wittenberg, Inst Geobot & Bot Garden, D-06108 Halle, Germany
[2] Natl Univ Cordoba, Catedra Ecol Gen, RA-5000 Cordoba, Argentina
[3] Natl Univ Cordoba, IMBiV, RA-5000 Cordoba, Argentina
[4] Environm Res Ctr Leipzig Halle, Dept Chem Ecotoxicol, D-04318 Leipzig, Germany
关键词
fragmentation; natural pollination; reproductive success; wind pollination; fragment size;
D O I
10.1016/j.flora.2006.12.002
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
It is well known that habitat fragmentation is likely to negatively affect the reproductive success of a species. Despite this fact, studies on the effects of fragmentation on reproductive success in combination with effects on natural pollination of wind-pollinated tree species are very rare. In this study, we analyzed the relationships between fragment size, components of pollination efficiency, reproductive success and progeny vigour of the highly fragmented populations of the wind-pollinated treeline species Polylepis australis (Rosaceae) in Argentina. We conducted our study in the high mountains of Cordoba, comparing pollination efficiency and reproduction between four fragment sizes. Most of our results indicate that P. australis is currently insensitive to fragmentation. However, our study revealed also a linear increase in leaf area and biomass of 40-day-old seedlings with increasing fragment size. Inbreeding problems through fragmentation as well as decreased habitat quality in small fragments are discussed as possible causes for the impaired progeny vigour. (c) 2007 Elsevier GmbH. All rights reserved.
引用
收藏
页码:547 / 554
页数:8
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