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Journal of the International Association of Wildland Fire
RESEARCH ARTICLE

Persistence of obligate-seeding species at the population scale: effects of fire intensity, fire patchiness and long fire-free intervals

Mark K. J. Ooi A B C , Robert J. Whelan A and Tony D. Auld B
+ Author Affiliations
- Author Affiliations

A Institute for Conservation Biology, School of Biological Sciences, University of Wollongong, NSW 2522, Australia.

B Biodiversity Conservation Science Section, Department of Environment and Conservation (NSW), PO Box 1967, Hurstville, NSW 2220, Australia.

C Corresponding author. Email: mark.ooi@environment.nsw.gov.au

International Journal of Wildland Fire 15(2) 261-269 https://doi.org/10.1071/WF05024
Submitted: 23 March 2005  Accepted: 15 February 2006   Published: 31 May 2006

Abstract

Understanding how a species persists under a particular fire regime requires knowledge of the response to fire of individual plants. However, categorising the fire response of a species solely based on known responses of individual plants can be misleading when predicting a population response. In the present study, we sought to determine the fire responses of several Leucopogon species at the population level, including the threatened L. exolasius. We found that, whilst all species studied were obligate seeders, the population responses of species to fire were dependent upon fire intensity and patchiness. Results showed first that low intensity fires were significantly patchier than higher intensity fires. Second, the proportion of plants killed within a population decreased with increased fire patchiness. We also assessed how populations were structured and found that stands were multi-aged at most sites, and did not have a single-aged structure, which is often assumed for obligate seeders. Both spatial complexity within the fire regime leading to adult plant persistence, and inter-fire recruitment, contributed to the multi-aged structure. It is possible that these Leucopogon species are gap recruiters, and may tolerate fire rather than be specifically adapted to it. Inter-fire recruitment may enable L. exolasius populations to persist for a much longer fire-free period than many other species in the region.

Additional keywords: Epacridaceae; Ericaceae; Leucopogon; rarity; soil seed bank; south-eastern Australia; threatened species.


References


Auld TD (1987) Population dynamics of the shrub Acacia suaveolens (Sm.) Willd.: survivorship throughout the life cycle, a synthesis. Australian Journal of Ecology  12, 139–151.
Bell DT, Hopkins AJM, Pate JS (1984) Fire in the Kwongan. In ‘Kwongan: plant life of the sandplain’. (Eds JS Pate, JS Beard) pp. 178–204. (University of Western Australia Press: Nedlands)

Bell TL, Pate JS , Dixon KW (1996) Relationships between fire response, morphology, root anatomy and starch distribution in south-west Australian Epacridaceae. Annals of Botany  77, 357–364.
Crossref | GoogleScholarGoogle Scholar | Bond WJ (1997) Functional types for predicting changes in biodiversity: a case study in Cape Fynbos. In ‘Plant functional types: their relevance to ecosystem properties and global change’. (Eds TM Smith, HH Shugart, FI Woodward) pp. 174–194. (Cambridge University Press: Cambridge)

Bond WJ, van Wilgen BW (1996) ‘Fire and plants.’ (Chapman & Hall: London)

Bradstock RA , O’Connell MA (1988) Demography of woody plants in relation to fire: Banksia ericifolia L.f. and Petrophile pulchella (Schrad) R.Br. Australian Journal of Ecology  13, 505–518.
Catchpole W (2002) Fire properties and burn patterns in heterogeneous landscapes. In ‘Flammable Australia: the fire regimes and biodiversity of a continent’. (Eds RA Bradstock, JE Williams, AM Gill) pp. 199–237. (Cambridge University Press: Cambridge)

Cheal D (1994) ‘Fire and biodiversity: the effects and effectiveness of fire management.’ Proceedings of the Conference held 8–9 October 1994, Footscray, Melbourne. Biodiversity Series, Paper No. 8. (Biodiversity Unit, Environment Australia: Canberra)

Cheney NP (1990) Quantifying bushfires. Mathematical and Computer Modelling  13, 9–15.
Crossref | GoogleScholarGoogle Scholar | Clark JS, Gill AM, Kershaw AP (2002) Spatial variability in fire regimes: its effects on recent and past vegetation. In ‘Flammable Australia: the fire regimes and biodiversity of a continent’. (Eds RA Bradstock, JE Williams, AM Gill) pp. 199–237. (Cambridge University Press: Cambridge)

Clarke PJ (2002) Habitat insularity and fire response traits: evidence from a sclerophyll archipelago. Oecologia  132, 582–591.
Crossref | GoogleScholarGoogle Scholar | Fairley A, Moore P (1989) ‘Native plants of the Sydney district.’ (Kangaroo Press: Kenthurst)

Gill AM (1981) Adaptive responses of Australian vascular plant species to fire. In ‘Fire and the Australian biota’. (Eds AM Gill, R Groves, I Noble) pp. 243–271. (Australian Academy of Science: Canberra)

Gill AM, Bradstock RA (1995) Extinction of biota by fires. In ‘Conserving biodiversity: threats and solutions’. (Eds RA Bradstock, TD Auld, DA Keith, RT Kingsford, D Lunney, DP Sivertsen) pp. 309–322. (Surrey Beatty and Sons: Chipping Norton)

Harden GJ (1992) ‘Flora of NSW, Volume 3.’ (UNSW Press: Sydney)

Hobbs RJ , Atkins L (1988) Spatial variability of experimental fires in south-west Western Australia. Australian Journal of Ecology  13, 295–299.
Keeley JE (1986) Resilience of Mediterranean shrub communities to fires. In ‘Resilience in Mediterranean-type ecosystems’. (Eds B Dell, AJM Hopkins, BB Lamont) pp. 95–112. (Dr W Junk Publishers: Dordrecht)

Keeley JE (1987) Role of fire in seed germination of woody taxa in California chaparral. Ecology  68, 434–443.

Crossref | Keith DA, McCaw WL, Whelan RJ (2002) Fire regimes in Australian heathlands and their effects on plants and animals. In ‘Flammable Australia: the fire regimes and biodiversity of a continent’. (Eds RA Bradstock, JE Williams, AM Gill) pp. 199–237. (Cambridge University Press: Cambridge)

Kron KA, Judd WS, Stevens PF, Crayn DM, Anderberg AA, Gadek PA, Quinn CJ , Luteyn JL (2002) Phylogenetic classification of Ericaceae: molecular and morphological evidence. Botanical Review  68, 335–423.
Kruger FJ, Bigalke RC (1984) Fire in fynbos. In ‘Ecological effects of fire in South African ecosystems’. (Eds P de Van Booysen, NM Tainton) pp. 69–94. (Springer-Verlag: Berlin)

Lamont BB, le Maitre DC, Cowling RM , Enright NJ (1991) Canopy seed storage in woody plants. Botanical Review  57, 277–317.
Specht RL (1970) Vegetation. In ‘The Australian environment’. (Ed. GW Leeper) pp. 44–67. (CSIRO and Melbourne University Press: Melbourne)

Stern H, de Hoedt G , Ernst J (2000) Objective classification of Australian climates. Australian Meteorological Magazine  49, 87–96.
Whelan RJ (1995) ‘The ecology of fire.’ (Cambridge University Press: London)

Whelan RJ, de Jong N , von der Burg S (1998) Variation in bradyspory and seedling recruitment without fire among populations of Banksia serrata (Proteaceae). Australian Journal of Ecology  23, 121–128.
Whelan RJ, Rodgerson L, Dickman CR, Sutherland EF (2002) Critical life cycles of plants and animals: developing a process-based understanding of population changes in fire-prone landscapes. In ‘Flammable Australia: the fire regimes and biodiversity of a continent’. (Eds RA Bradstock, JE Williams, AM Gill) pp. 94–124. (Cambridge University Press: Cambridge)

Williams JE, Whelan RJ , Gill AM (1994) Fire and environmental heterogeneity in southern temperate forest ecosystems: implications for management. Australian Journal of Botany  42, 125–137.
Crossref | GoogleScholarGoogle Scholar |