Fire form and function: evidence for exaptive flammability in the New Zealand flora
2016
This study tests whether or not foliar
flammabilityis related to resource-use and anti-herbivore defence strategies of plant species. We measured the
flammability(at 400 °C) of 1640 dry and fresh leaves across 115 common native New Zealand woody and herbaceous species collected from sites throughout New Zealand. We used three indicators of foliar
flammability—leaf temperature at smoke production and on ignition and the rate of increase in leaf temperature during the combustion process. We tested for relationships between these
flammabilitymeasures, foliar morphological and chemical traits and growth form. All significant correlations showed increased foliar
flammabilitywith increasing foliar surface area:volume ratio (SAV) and nutrient content and decreasing tissue density, lignin and secondary metabolite concentrations. Coniferous trees were the growth form with the least
flammableleaves due to leaf morphology associated low leaf SAV and high tissue density. This suggests there may be a general relationship between resource-use strategies and foliar
flammability, via the influence of leaf morphology on both these aspects of plant function.
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