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The compensatory responses of an understory herb to experimental damage are habitat-dependent¹

²Department of Wildlife Ecology and Conservation, P.O. Box 110430, University of Florida, Gainesville, Florida 32611-0430 USA and Center for Latin American Studies, University of Florida, Gainesville, Florida 32611-5530 USA; ³Biological Dynamics of Forest Fragments Project, INPA, CP 478, Manaus, AM 69011, Brazil

Canopy gap formation strongly influences the diversity and dynamics of both tropical and temperate forests. It is often viewed as inherently beneficial for understory plants, primarily because growth and flowering are enhanced when light is no longer a limiting resource. It can also be detrimental, however, because plants can be damaged by falling crowns or branches. To elucidate the responses of the Amazonian understory herb Heliconia acuminata to damage sustained during gap formation, we transplanted both experimentally damaged and control plants to canopy gaps and the forest understory. We then measured their patterns of growth and biomass allocation 10 mo later. Despite losing approximately 50% of their leaf area, all damaged plants survived the duration of our experiment. Furthermore, damaged plants transplanted to gaps had relative growth rates that far exceeded those of undamaged plants in both gaps and the forest understory. There were also significant interactions between damage and destination habitat type on root to shoot ratios and leaf-area ratios. Our results suggest the ability of herbaceous plants to recover from damage, as well as patterns of post-damage biomass allocation, may be habitat-dependent in ways that have previously remained unexplored.

Key Words: • biomass allocation • compensation • Heliconia acuminata • Heliconiaceae • relative growth rate • treefall gaps • tropical rain forest

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