Journal Title
Title of Journal: Plant Ecol
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Abbravation: Plant Ecology
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Publisher
Springer Netherlands
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Authors: Wade A Wall William A Hoffmann Thomas R Wentworth Janet B Gray Matthew G Hohmann
Publish Date: 2012/06/20
Volume: 213, Issue: 7, Pages: 1093-1104
Abstract
Fire can have dramatic effects on the vital rates of plant species and has been used successfully for management in a number of ecosystems However the demographic response of species to fire in firedependent ecosystems is variable making it important to study the effects of fire on rare and threatened species We quantified the effects of fire on Astragalus michauxii and Pyxidanthera brevifolia two rare endemics of the longleaf pinewiregrass ecosystem of the southeastern USA by means of periodic matrix models to project the effect of fire frequency on population growth In contrast to many species in the longleaf pinewiregrass ecosystem fire had shortterm negative effects on both species causing reductions in survival size flowering and fruit production Relative to the threeyear fire intervals to which the study populations are currently exposed more frequent burning is projected to cause population decline with the most dramatic effects under annual burning Although the current longleaf pinewiregrass ecosystem is fire dependent and has experienced frequent fire for at least several thousand years we propose that the two endemic species may be remnants from a past vegetation assemblage that experienced less frequent fire and thus may be adapted to longer firereturn intervals compared to other species currently in the ecosystem Despite the shortterm negative effects of fire on the vital rates of these species longerterm benefits such as reduction of woody encroachment and litter removal may be important for the ultimate success of the speciesWe thank Fort Bragg Military Reservation and the Endangered Species Branch for logistic support and the Construction Engineering Research Laboratory US Army Corps of Engineers Agreement W9132T0720019 for funding We also thank Conseulo Arellano Matthew Cleary Brendan Dawal Sherry Emerine Will Fields Kevin Gross Jacob Hilton Kristen Kostelnik the North Carolina Natural Heritage Program the North Carolina Botanical Garden Renee Marchin Eric Menges Robert Peet Bruce Sorrie Andrew Walker Alan Weakley and the Hoffmann lab We thank Rob SalgueroGómez and two anonymous reviewers for their helpful comments Finally we thank North Carolina State University and its Plant Biology Department for financial support during the course of this study
Keywords:
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- Regional and local variation in seedling emergence, mortality and recruitment of a perennial herb in Mediterranean mountain habitats
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