Publicación: ANTHROPOGENIC FIRES INCREASE ALIEN AND NATIVE ANNUAL SPECIES IN THE CHILEAN COASTAL MATORRAL
Fecha
2011
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AIM WE TESTED THE HYPOTHESIS THAT ANTHROPOGENIC FIRES FAVOUR THE SUCCESSFUL ESTABLISHMENT OF ALIEN ANNUAL SPECIES TO THE DETRIMENT OF NATIVES IN THE CHILEAN COASTAL MATORRAL.
LOCATION VALPARAÍSO REGION, CENTRAL CHILE.
METHODS WE SAMPLED SEED RAIN, SEEDBANK EMERGENCE AND ESTABLISHMENT OF SPECIES IN FOUR PAIRED BURNED AND UNBURNED AREAS AND COMPARED (USING GLMM) FIRE RESISTANCE AND PROPAGULE ARRIVAL OF ALIEN AND NATIVE SPECIES. TO ASSESS THE RELATIVE IMPORTANCE OF SEED DISPERSAL AND SEEDBANK SURVIVAL IN EXPLAINING PLANT ESTABLISHMENT AFTER FIRE, WE COMPARED SEED RAIN AND SEEDBANK STRUCTURE WITH POST-FIRE VEGETATION USING ORDINATION ANALYSES.
RESULTS FIRE DID NOT CHANGE THE PROPORTION OF ALIEN SPECIES IN THE COASTAL MATORRAL. HOWEVER, FIRE INCREASED THE NUMBER OF ANNUAL SPECIES (NATIVES AND ALIENS) OF WHICH 87% WERE ALIENS. FIRE REDUCED THE ALIEN SEEDBANK AND NOT THE NATIVE SEEDBANK, BUT ALIEN SPECIES REMAINED DOMINANT IN BURNED SOIL SAMPLES (66% OF THE TOTAL SPECIES RICHNESS). SEED RAIN WAS HIGHER FOR ALIEN ANNUALS THAN FOR NATIVE ANNUALS OR PERENNIALS, THUS CONTRIBUTING TO THEIR ESTABLISHMENT AFTER FIRE. NEVERTHELESS, SEED RAIN WAS LESS IMPORTANT THAN SEEDBANK SURVIVAL IN EXPLAINING PLANT ESTABLISHMENT IN BURNED AREAS.
