IMBIV   05474
INSTITUTO MULTIDISCIPLINARIO DE BIOLOGIA VEGETAL
Unidad Ejecutora - UE
artículos
Título:
Fragment size, pollination efficiency and reproductive success in natural populations of wind-pollinated Polylepis australis (Rosaceae) trees.
Autor/es:
SELTMANN, P.; RENISON, D.; COCUCCI, A. A.; HENSEN, I.; JUNG, K.
Revista:
FLORA
Referencias:
Año: 2007 vol. 202 p. 547 - 554
ISSN:
0367-2530
Resumen:
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 ef.ciency, 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 Co´ rdoba, comparing pollination ef.ciency 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.