Sequential large-scale disturbances may produceinteracting effects that differ from those predictedfor each disturbance in isolation. These non-additiveeffects can strongly influence the composition andstructure of plant communities. Hurricanes andnatural lightning-season fires are large-scale,frequent disturbances in savanna-forest landscapes ofthe southeastern US. Passmore develops a predictiveconceptual model for interacting disturbances. Shepredicts that hurricane-fire interactions mayinfluence ecotones between savannas and forests bychanging species composition and structure. Based onpredictions, Passmore implemented an experimentalstudy in savanna-forest ecotone to test hypotheses ofinteractive effects. She hypothesized that effects oflightning-season fires differ when fires occur alonecompared to when fires are preceded by hurricanes.Disturbance interactions reduced stem density andspecies richness of woody plants in the field study.Thus, hurricane-fire interactions influencevegetation structure in savanna-forest ecotones. Furthermore, over longer time scales interactions mayresult in landscape-level changes in southeasternsavanna-forest ecosystems.
Hurricane and fire effects in savanna-forest landscapes
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Description
Sequential large-scale disturbances may produceinteracting effects that differ from those predictedfor each disturbance in isolation. These non-additiveeffects can strongly influence the composition andstructure of plant communities. Hurricanes andnatural lightning-season fires are large-scale,frequent disturbances in savanna-forest landscapes ofthe southeastern US. Passmore develops a predictiveconceptual model for interacting disturbances. Shepredicts that hurricane-fire interactions mayinfluence ecotones between savannas and forests bychanging species composition and structure. Based onpredictions, Passmore implemented an experimentalstudy in savanna-forest ecotone to test hypotheses ofinteractive effects. She hypothesized that effects oflightning-season fires differ when fires occur alonecompared to when fires are preceded by hurricanes.Disturbance interactions reduced stem density andspecies richness of woody plants in the field study.Thus, hurricane-fire interactions influencevegetation structure in savanna-forest ecotones. Furthermore, over longer time scales interactions mayresult in landscape-level changes in southeasternsavanna-forest ecosystems.
Savannas cover around twenty percent of the world's land surface. With their vast extent, these areas - such as the famous Serengeti - not only provide an important environment for many plant and...
Soil is a limited and non-renewable natural resource that performs multiple ecosystem or environmental services, including the regulation of biogeochemical cycles, carbon fixation, and water storage...
Fire is a major agent of disturbance in many biomes of the world but is a particularly important feature of tropical savannas. Up to 50% of the ext- sive tropical savanna landscapes of northern...
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