Do alien plants on Mediterranean islands tend to invade different niches from native species?.

Lambdon PW, Lloret F, Hulme PE (2008) Do alien plants on Mediterranean islands tend to invade different niches from native species?. Biological Invasions 10: 703-716.

How do introduction characteristics influence the invasion success of Mediterranean alien plants? .

Lambdon PW, Lloret F, Hulme PE (2008) How do introduction characteristics influence the invasion success of Mediterranean alien plants? . Perspectives in Plant, Ecology, Evolution and Systematics 10: 143-159.

Do non-native species invasion lead to biotic homogenization at small scales? Similarity and functional diversity of habitats compared for the alien and native components of Mediterranean floras.

Lambdon PW, Lloret F, Hulme PE (2008) Do non-native species invasion lead to biotic homogenization at small scales? Similarity and functional diversity of habitats compared for the alien and native components of Mediterranean floras. Diversity and Distributions 14: 774-785.

Fire frequency effects on the structure and composition of a Mediterranean shrubland community.

Vilà-Cabrera A, Saura-Mas S, Lloret F (2008) Fire frequency effects on the structure and composition of a Mediterranean shrubland community. Ecoscience 15: 519-528.

Recurrent wildfires constrain long-term reproduction ability in Pinus halepensis Mill.

Espelta JM, Verkaik I, Eugenio M, Lloret F (2008) Recurrent wildfires constrain long-term reproduction ability in Pinus halepensis Mill. International Journal of Wildland Fire 17: 579-585.

Simulated climate change provokes rapid genetic change in the Mediterranean shrub Fumana thymifolia

Jump A.S., Peñuelas J., Rico L., Ramallo E., Estiarte M., Martínez-Izquierdo J.A., Lloret F. (2008) Simulated climate change provokes rapid genetic change in the Mediterranean shrub Fumana thymifolia. Global Change Biology. 14: 637-643.
Enllaç
Doi: 10.1111/j.1365-2486.2007.01521.x

Resum:

Rapid climate change will impose strong directional selection pressures on natural plant populations. Climate-linked genetic variation in natural populations indicates that an evolutionary response is possible. We investigated such a response by comparing individuals subjected to elevated drought and warming treatments with individuals establishing in an unmanipulated climate within the same population. We report that reduction in seedling establishment in response to climate manipulations is nonrandom and results from the selection pressure imposed by artificially warmed and droughted conditions. When compared against control samples, high single-locus genetic divergence occurred in drought and warming treatment samples, with genetic differentiation up to 37 times higher than background (mean neutral locus) genetic differentiation. These loci violate assumptions of selective neutrality, indicating the signature of natural selection by drought. Our results demonstrate that rapid evolution in response to climate change may be widespread in natural populations, based on genetic variation already present within the population. © 2008 The Authors Journal compilation © 2008 Blackwell Publishing Ltd.

Llegeix més

Effects of fire frequency on species composition in a Mediterranean shrubland

Vilà-Cabrera A., Saura-Mas S., Lloret F. (2008) Effects of fire frequency on species composition in a Mediterranean shrubland. Ecoscience. 15: 519-528.
Enllaç
Doi: 10.2980/15-4-3164

Resum:

The effect of high fire frequency on the species composition of Mediterranean-type plant communities is reported on the basis of shrubland stands located in Catalonia (Spain) that have experienced from 1 to 5 fires over the last 31 years. We focused on changes in the abundance of species, grouped according to post-fire regenerative traits (resprouting and seed germination) and life form (shrubs, herbaceous graminoids, and herbaceous non-graminoids). High fire frequency was related to a low abundance of obligate resprouter and obligate seeder shrubs. In the latter group, Cistus sp. disappeared in stands with high fire frequency and showed a maximum abundance in stands with low fire frequency. The abundance of facultative resprouter shrubs did not change with fire frequency. This group thus became dominant in the shrub layer at high fire frequency due to the low abundance of obligate resprouter and obligate seeder shrubs. These changes in the abundance of shrub species involve changes in the patterns of relative dominance of regenerative syndromes, in line with fire frequency. An examination of life forms revealed that the abundance of herbaceous non-graminoids and herbaceous graminoids was higher in stands with high fire frequency and the graminoid Brachypodium retusum was dominant at all fire frequencies. These results suggest a loss in the resilience of shrubs after frequent fires, leading to a simplification of vegetation structure with a shift from shrubland to grassland-type communities, thereby probably enhancing a potential positive herb-fire feedback.

Llegeix més