Biologie d'une espèce endémique à aire restreinte: Centaurea corymbosa Pourret. Conséquences pour sa conservation.

Colas B, Riba M, Olivieri I, Ronce O, Henry JP (1999) Biologie d'une espèce endémique à aire restreinte: Centaurea corymbosa Pourret. Conséquences pour sa conservation. Bulletin de la Société Botanique du Centre-Ouest 19: 279-293.

Seed germination and seedling performance of two Mediterranean tree species, holm oak (Quercus ilex L.) and Aleppo pine (Pinus halepensis Mill.): A multifactor experimental approach

Broncano M.J., Riba M., Retana J. (1998) Seed germination and seedling performance of two Mediterranean tree species, holm oak (Quercus ilex L.) and Aleppo pine (Pinus halepensis Mill.): A multifactor experimental approach. Plant Ecology. 138: 17-26.
Enllaç
Doi: 10.1023/A:1009784215900

Resum:

A two-level multifactor experimental approach was used to compare seed germination and seedling performance of two Mediterranean tree species: the early successional aleppo pine (Pinus halepensis Mill.) and the late successional holm oak (Quercus ilex L.). In a first experiment germination rate was evaluated under the combined effects of shade, nitrogen availability, and pine or holm oak leaf litter. In a second experiment we tested for the effects of shade, nutrient availability, and litter type on seedling survival, growth and biomass allocation. Holm oak showed higher germination rates under shaded than under unshaded conditions, while Aleppo pine showed no differences between shaded and unshaded conditions. Nitrogen availability and litter type had no significant effect on germination of either species. Both species showed increased RGR, but also higher mortality rates, when grown in an enriched nutrient environment. While Aleppo pine showed no differences in RGR and mortality rate under different shading levels, RGR decreased and mortality increased for holm oak in full light. Increased radiation decreased LAR, SLA and height:diameter ratio, and increased RWR and R/S in both species, although Aleppo pine showed more pronounced changes. Unlike Aleppo pine, holm oak responded to increased nutrient availability by decreasing R/S and increasing LAR. From these results, no seed-seedling conflicts were found in either species, but a trade-off does seem to exist for holm oak between biomass allocation traits deployed in response to increased nutrient availability and radiation. Aleppo pine outperformed holm oak under most environmental conditions tested and showed a wider regeneration niche.

Llegeix més

Effects of intensity and frequency of crown damage on resprouting of Erica arborea L. (Ericaceae).

Riba M (1998) Effects of intensity and frequency of crown damage on resprouting of Erica arborea L. (Ericaceae). Acta Oecologica 19:9-16.

Marsilea strigosa Willd.: Statut génétique et démographique d'une espèce menacée.

Vitalis R, Colas B, Riba M, Olivieri I (1998) Marsilea strigosa Willd.: Statut génétique et démographique d'une espèce menacée. Ecologia Mediterranea 24:145-157.

Predicting endemism from population structure of a widespread species: case study in Centaurea maculosa Lam. (Asteraceae).

Fréville H, Colas B, Ronfort J, Riba M, Olivieri I (1998) Predicting endemism from population structure of a widespread species: case study in Centaurea maculosa Lam. (Asteraceae). Conservation Biology 12:1269-1278.

Supervivencia y crecimiento de plántulas de encina en función de la intensidad de la luz y la disponibilidad de agua.

Espelta JM, Retana J, Riba M (1997) Supervivencia y crecimiento de plántulas de encina en función de la intensidad de la luz y la disponibilidad de agua. Irati 97, Montes del futuro respuesta ante un mundo en cambio. Mesa 4. pp. 237-242.

Centaurea corymbosa, a cliff-dwelling species tottering on the brink of extinction: A demographic and genetic study.

Colas B, Olivieri I, Riba M (1997) Centaurea corymbosa, a cliff-dwelling species tottering on the brink of extinction: A demographic and genetic study. Proceedings of the National Academy of Sciences 94:3471-3476.

Effects of cutting and rainfall pattern on resprouting vigour and growth of Erica arborea L.

Riba M (1997) Effects of cutting and rainfall pattern on resprouting vigour and growth of Erica arborea L. Journal of Vegetation Science 8:401-404.

Statut démographique de Centaurea corymbosa Pourret (Asteraceae), Hormatophylla pyrenaica (Lapeyr.) Cullen &amp

Colas B, Riba M, Molina J (1996) Statut démographique de Centaurea corymbosa Pourret (Asteraceae), Hormatophylla pyrenaica (Lapeyr.) Cullen & Dudley (Brassicaceae), et Marsilea strigosa Willd. (Marsileaceae-Pteridophyta), trois plantes rares dans le sud de la Fr ance. Acta Botanica Gallica 143:191-198.

Patterns of seedling recruitment in West‐Mediterranean Quercus ilex forest influenced by canopy development

Espelta, J.M., Riba, M., Javier, R. (1995) Patterns of seedling recruitment in West‐Mediterranean Quercus ilex forest influenced by canopy development. Journal of Vegetation Science. 6: 465-472.
Enllaç
Doi: 10.2307/3236344

Resum:

Pàgines