13,000 years of fire activity in a temperate rainforest on the Central Coast of British Columbia, Canada

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dc.contributor.author Hoffman, Kira M.
dc.date.accessioned 2018-04-10T14:49:29Z
dc.date.available 2018-04-10T14:49:29Z
dc.date.copyright 2018 en_US
dc.date.issued 2018-04-10
dc.identifier.uri http://hdl.handle.net/1828/9210
dc.description.abstract While wildfire is globally most common in the savanna-grassland ecotone, the flammability of coastal temperate rainforests is considered low and little is known regarding historic fire activity. Reconstructing historical fire activity typically requires dendrochronological records from fire-scarred trees and post-fire cohorts, but this type of information is rare in perhumid temperate rainforests, which are dominated by dense fuels with high year-round moisture content. I reconstructed historic fire activity using fire scars, tree rings, soil charcoal, and remote sensing techniques in a 2000 km2 island group located within the Hakai Lúxvbálís Conservancy on the coastal margin of central British Columbia. I broadly assessed 13,000 years of fire activity with charcoal deposited in soils, and reconstructed late Holocene fire events with a 700-year chronology built from living fire-scarred trees and stand establishment data. I used a weight of evidence approach to hypothesize the origins of fires and whether First Nations intentionally utilized fire for resource management. Low-severity fires occurred most frequently in forests surrounding former First Nations habitation sites, and lightning strikes do not occur often enough to explain the observed temporal or spatial patterns of fire activity in the study area. Low-severity fires occurred approximately every 39 years, and were 25 times more likely to occur than previously estimated. Fires influenced the composition and structure of vegetation by creating a mosaic of vegetation types in different stages of succession, and thus increased the abundance of culturally important food plants. Fire events have not occurred in the study area since 1893, which also coincides with the reduction of First Nations activities in their traditional territories. My data are consistent with the hypothesis that humans intentionally used fire to manage resources, though further research and ethnographic data collected elsewhere in the region is required to corroborate these findings. Ecological legacies of historic fires remain visible on the present day landscape, and by reconstructing the historic range of fire cycle variability we gain a better understanding of human-driven fire activity and the abrupt changes that occurred in the 20th century. en_US
dc.language English eng
dc.language.iso en en_US
dc.rights Available to the World Wide Web en_US
dc.subject Fire ecology en_US
dc.subject Traditional fire management en_US
dc.subject British Columbia en_US
dc.subject Perhumid rainforests en_US
dc.subject Coastal Temperate Rainforest en_US
dc.subject Canada en_US
dc.subject Cultural burning en_US
dc.subject Dendroecology en_US
dc.subject Holocene en_US
dc.subject Soil charcoal en_US
dc.subject Ecological legacies en_US
dc.subject Remote sensing en_US
dc.subject Ethnoecology en_US
dc.subject Western redcedar en_US
dc.title 13,000 years of fire activity in a temperate rainforest on the Central Coast of British Columbia, Canada en_US
dc.type Thesis en_US
dc.contributor.supervisor Starzomsk, Brian M.
dc.degree.department School of Environmental Studies en_US
dc.degree.level Doctor of Philosophy Ph.D. en_US
dc.identifier.bibliographicCitation Hoffman KM, Gavin DG, Starzomski BM. 2016b. 700 years of human driven and climate influenced fire activity in a coastal temperate rainforest, British Columbia, Canada. Royal Society Open Science 3:160608. en_US
dc.identifier.bibliographicCitation Hoffman KM, Gavin DG, Lertzman KP, Smith DJ, Starzomski BM. 2016a. 13,000 years of fire history derived from soil charcoal in a British Columbia coastal temperate rainforest. Ecosphere 7:e01415. en_US
dc.identifier.bibliographicCitation Hoffman KM, Lertzman KP, Starzomski BM. 2017. Ecological legacies of historic fire activity in a British Columbia coastal temperate rainforest. Journal of Biogeography 44(12):2903–2915. en_US
dc.description.scholarlevel Graduate en_US

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