Australian Journal of Botany Australian Journal of Botany Society
Southern hemisphere botanical ecosystems
RESEARCH ARTICLE

Conservation biology of banksias: insights from natural history to simulation modelling

Byron B. Lamont A E , Neal J. Enright A B , E. T. F. Witkowski A C and J. Groeneveld D

A Centre for Ecosystem Diversity and Dynamics, Environmental Biology, Curtin University of Technology, PO Box U1987, Perth, WA 6845, Australia.

B Geography Program, Social and Environmental Enquiry, University of Melbourne, Parkville, Vic. 3010, Australia.

C Animal, Plant and Environmental Sciences, University of the Witwatersrand, Johannesburg, PO Wits 2050, South Africa.

D Ecological Modelling, UFZ Centre for Environmental Research, Leipzig-Halle, Germany.

E Corresponding author: Email: B.Lamont@curtin.edu.au

Australian Journal of Botany 55(3) 280-292 https://doi.org/10.1071/BT06024
Submitted: 9 February 2006  Accepted: 27 June 2006   Published: 18 May 2007

Abstract

We have studied the ecology and conservation requirements of Banksia species in the species-rich sandplains of south-western Australia for 25 years. Loss of habitat through land-clearing has had the greatest impact on their conservation status over the last 50 years. Ascertaining optimal conditions for conservation management in bushland requires detailed knowledge of the species under consideration, including demographic attributes, fire regime, growing conditions and interactions with other species. Where populations have been fragmented, seed production per plant has also fallen. The group most vulnerable to the vagaries of fire, disease, pests, weeds and climate change are the non-sprouters, rather than the resprouters, with population extinction so far confined to non-sprouting species. Recent short-interval fires (<8 years) appear to have had little impact at the landscape scale, possibly because they are rare and patchy. Fire intervals exceeding 25–50 years can also lead to local extinction. Up to 200 viable seeds are required for parent replacement in Banksia hookeriana when growing conditions are poor (low post-fire rainfall, commercial flower harvesting) and seed banks of this size can take up to 12 years to be reached. Seed production is rarely limited by pollinators, but interannual seasonal effects and resource availability are important. Genetic diversity of the seed store is quickly restored to the level of the parents in B. hookeriana. Florivores and granivores generally reduce seed stores, although this varies markedly among species. In Banksia tricuspis, black cockatoos actually increase seed set by selectively destroying borers. Potential loss of populations through the root pathogen Phytophthora cinnamomi also challenges management, especially in the southern sandplains. Prefire dead plants are a poor source of seeds for the next generation when fire does occur. Harvesting seeds and sowing post-fire have much to commend them for critically endangered species. Bare areas caused by humans can result in ideal conditions for plant growth and seed set. However, in the case of B. hookeriana/B. prionotes, disturbance by humans has fostered hybridisation, threatening the genetic integrity of both species, whereas fine-textured soils are unsuitable for colonisation or rehabilitation. Few viable seeds become seedlings after fire, owing to post-release granivory and herbivory and unsuitable germination conditions. Seedling-competitive effects ensure that season/intensity of fire is not critical to recruitment levels, except in the presence of weeds. Water availability during summer–autumn is critical and poses a problem for conservation management if the trend for declining rainfall in the region continues. Our simulation modelling for three banksias shows that the probability of co-occurrence is maximal when fire is stochastic around a mean of 13 years, and where fire-proneness and post-fire recruitment success vary in the landscape. Modelling results suggest that non-sprouting banksias could not survive the pre-European frequent-fire scenario suggested by the new grasstree technique for south-western Australia. However, we have yet to fully explore the conservation significance of long-distance dispersal of seeds, recently shown to exceed 2.5 km in B. hookeriana.


Acknowledgements

Much of our research was funded by the Australian Research Council, Australian Nature Conservation Agency (Endangered Species Program), World Wildlife Fund (Australia) and CALM (now DEC) since 1982. The reference list bears witness to the many eager and talented participants in this program. We thank Dr Ben Miller for providing data (now in press) on the conservation status of B. hookeriana. This is contribution CEDD09-2007 from the Centre for Ecosystem Diversity and Dynamics, Curtin University.


References


Abbott I (1985) Reproductive ecology of Banksia grandis (Proteaceae) New Phytologist 99, 129–148.
CrossRef | open url image1

Abbott I (2003) Aboriginal fire regimes in south-western Australia: evidence from historical documents. In ‘Fire in South-west Australian ecosystems: impacts and management’. (Eds I Abbott, N Burrows) pp. 146–169. (Backhuys: Leiden, The Netherlands)

Barrett LG, He TH, Lamont BB, Krauss SL (2005) Temporal patterns of genetic variation across a 9-year-old aerial seed bank of the shrub Banksia hookeriana (Proteaceae). Molecular Ecology 14, 4169–4179.
CrossRef | PubMed | open url image1

Bartlett WM (1975) ‘Western Australian Year Book. No. 14.’ (Australian Bureau of Statistics: Perth)

Beard JS (1976) ‘The vegetation of the Dongara Area.’ Vegetation Survey of Western Australia. (Vegmap Publications: Perth)

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

Burgman M, Lamont BB (1992) A stochastic model for the viability of Banksia cuneata: the role of fire, rainfall and genetics. Journal of Applied Ecology 29, 719–727.
CrossRef | open url image1

CALM (1998) ‘Management program for the commercial utilisation of Banksia hookeriana Meissner in Western Australia.’ (WA Department of Conservation and Land Management: Perth)

Collins BG, Rebelo T (1987) Pollination biology of the Proteaceae in Australia and southern Africa. Australian Journal of Ecology 12, 387–422.
CrossRef | open url image1

Collins BG, Spice J (1986) Honeyeaters and the pollination biology of Banksia prionotes (Proteaceae). Australian Journal of Botany 34, 175–185.
CrossRef | open url image1

Cowling R (Ed.) (1992) ‘The ecology of fynbos: nutrients, fire and diversity.’ (Oxford University Press: Cape Town)

Cowling RM, Lamont BB (1985) Seed release in Banksia: the role of wet-dry cycles. Australian Journal of Ecology 10, 169–171.
CrossRef | open url image1

Cowling RM, Lamont BB (1987) Post-fire recruitment of four co-occurring Banksia species. Journal of Applied Ecology 24, 645–658.
CrossRef | open url image1

Cowling RM, Lamont BB, Pierce SM (1987) Seed bank dynamics of four co-occurring Banksia species. Journal of Ecology 75, 289–302.
CrossRef | open url image1

Cowling RM , Lamont BB , Enright NJ (1990) Fire and management of banksias in southwestern Australia. In ‘Australian ecosystems: 200 years of utilization, degradation and reconstruction’. (Eds D Saunders, R How, A Hopkins) pp. 177–183. (Surrey Beatty: Sydney)

Dreschler M, Lamont BB, Burgman MA, Akçakaya HR, Witkowski ETF, Supriyadi (1999) Modelling the persistence of an apparently immortal Banksia species after fire and land clearing. Biological Conservation 88, 249–259.
CrossRef |
open url image1

Enright NJ, Lamont BB (1989a) Seeds banks, fire season, safe sites and seedling recruitment in five co-occurring Banksia species. Journal of Ecology 77, 1111–1122.
CrossRef | open url image1

Enright NJ, Lamont BB (1989b) Fire temperatures and follicle-opening requirements of ten Banksia species. Australian Journal of Ecology 14, 107–113. open url image1

Enright NJ, Lamont BB (1992a) Recruitment variability in the resprouter shrub Banksia attenuata and non-sprouter congeners in the northern sandplain scrub-heaths of southwestern Australia. Acta Oecologica 13, 727–741. open url image1

Enright NJ, Lamont BB (1992b) Survival, growth and water-relations of Banksia seedlings on sand mine tailings and adjacent scrub-heath sites. Journal of Applied Ecology 29, 663–671.
CrossRef | open url image1

Enright NJ, Lamont BB, Marsula R (1996) Canopy seed bank dynamics and optimum fire regime for the highly serotinous shrub, Banksia hookeriana. Journal of Ecology 84, 9–17.
CrossRef | open url image1

Enright NJ, Marsula R, Lamont BB, Wissel C (1998a) The ecological significance of canopy seed storage in fire-prone environments: a model for non-sprouting shrubs. Journal of Ecology 86, 946–959.
CrossRef | open url image1

Enright NJ, Marsula R, Lamont BB, Wissel C (1998b) The ecological significance of canopy seed storage in fire-prone environments: a model for resprouting shrubs. Journal of Ecology 86, 960–973.
CrossRef | open url image1

Enright NJ , Groeneveld J , Lamont BB , Miller BP (2005 a) Grasstree reconstructions of pre-European fire regimes and models of Banksia (Proteaceae) species co-existence in the northern sandplain shrublands of SW Australia: are they compatible? In ‘Variability in fire interval. How important is it and how do we manage it?’. Proceedings of a workshop held 26 September 2003, Albany, Western Australia. (Eds TV Walshe, JE Williams) pp. 11–21. (University of Western Australia: Perth)

Enright NJ, Lamont BB, Miller BP (2005b) Anomalies in grasstree fire history reconstructions for southwestern Australian vegetation. Austral Ecology 30, 668–673.
CrossRef | open url image1

George AS (1981) The genus Banksia (Proteaceae). Nuytsia 3, 239–474. open url image1

Gill AM , Nicholls AO (1989) Monitoring fire-prone flora in reserves for nature conservation. In ‘Fire management on nature conservation lands’. Occasional Paper 1/89. (Eds N Burrows, L McCaw, G Friend) pp. 137–151. (Western Australia, Department of Conservation and Land Management: Perth)

Goldingay RL, Carthew SM (1998) Breeding and mating system of Australian Proteaceae. Australian Journal of Botany 46, 421–437.
CrossRef | open url image1

Groeneveld J , Enright NJ (2004) A metapopulation model analysis for the fire-killed shrub, Banksia hookeriana, in southwestern Australia. In ‘Proceedings of the 10th international conference on Mediterranean climate ecosystems’. Rhodes, Greece. [CD-Rom].

Groeneveld J, Enright NJ, Lamont BB, Wissel C (2002) A spatial model of coexistence among three Banksia species along a habitat gradient in fire-prone shrublands. Journal of Ecology 90, 762–774.
CrossRef | open url image1

Hanley ME, Lamont BB (2001) Herbivory, serotiny and seedling defence in Western Australian Proteaceae. Oecologia 126, 409–417.
CrossRef | open url image1

He T, Krauss SL, Lamont BB, Miller BP, Enright NJ (2004) Long distance seed dispersal in a metapopulation of Banksia hookeriana inferred from a population allocation analysis of AFLP data. Molecular Ecology 13, 1099–1109.
CrossRef | PubMed | open url image1

Hnatiuk RJ, Hopkins AJM (1980) Western Australian species-rich kwongan (sclerophyllous shrubland) affected by drought. Australian Journal of Botany 28, 573–585.
CrossRef | open url image1

Hobbs RJ, Atkins L (1990) Fire-related dynamics of Banksia woodland in southwestern Australia. Australian Journal of Botany 38, 97–110.
CrossRef | open url image1

Hopper SD, Burbridge AH (1989) Conservation status of Banksia woodlands on the Swan Coastal Plain. Journal of the Royal Society of Western Australia 71, 115–116. open url image1

Johnstone RE , Storr GM (1998) ‘Handbook of Western Australian birds. Vol. 1.’ (Western Australian Museum: Perth)

Keighery GJ (1989) Banksia woodland weeds. Journal of the Royal Society of Western Australia 71, 111–112. open url image1

Keith DA , McCaw WL , Whelan RJ (2002) Fire regimes in Australian heathlands and their effects on plants and animals. In ‘Flammable Australia’. (Eds RA Bradstock, J Williams, AM Gill) pp.199–237. (Cambridge University Press: Cambridge, UK)

Lamont B (1985) Fire responses of sclerophyll shrublands—a population ecology approach, with particular reference to the genus Banksia. In ‘Fire ecology and management in Western Australian ecosystems’. Curtin, Environmental Studies Group Report No. 14, pp. 41–46.

Lamont BB (1988) Sexual versus vegetative reproduction in Banksia elegans. Botanical Gazette 149, 370–375.
CrossRef | open url image1

Lamont BB (1992) Functional interactions within plants—the contribution of keystone and other species to biodiversity. In ‘Biodiversity of Mediterranean ecosystems of Australia’. (Ed. RJ Hobbs) pp. 95–127. (Surrey Beatty: Sydney)

Lamont BB (1995) Mineral nutrient relations in mediterranean regions of California, Chile and Australia. In ‘Ecology and biogeography of Mediterranean ecosystems in Chile, California and Australia’. (Eds MT Arroya, PH Zedler, MD Fox) pp. 211–235. (Springer Verlag: New York)

Lamont BB (1996) Conservation biology of banksias in southwestern Australia. In ‘Gondwanan heritage’. (Eds SD Hopper, JA Chappill, MS Harvey, AS George) pp. 292–298. (Surrey Beatty: Sydney)

Lamont BB, Barker MJ (1988) Seed bank dynamics of a serotinous, fire-sensitive Banksia species. Australian Journal of Botany 36, 193–203.
CrossRef | open url image1

Lamont BB, Barrett GJ (1988) Constraints on seed production and storage in a root-suckering Banksia. Journal of Ecology 76, 1069–1082.
CrossRef | open url image1

Lamont BB, Bergl SM (1991) Water relations, shoot and root architecture, and phenology of three co-occurring Banksia species: no evidence for niche differentiation in the pattern of water use. Oikos 60, 291–298.
CrossRef | open url image1

Lamont BB, Collins BC (1988) Flower colour change in Banksia ilicifolia: a signal for pollinators. Australian Journal of Ecology 13, 129–135.
CrossRef | open url image1

Lamont BB, Connell SW (1996) Biogeography of Banksia in southwestern Australia. Journal of Biogeography 23, 295–309.
CrossRef | open url image1

Lamont BB, Cowling RM (1984) Flammable infructescences in Banksia: a fruit-opening mechanism. Australian Journal of Ecology 9, 295–296.
CrossRef | open url image1

Lamont BB, Markey A (1995) Biogeography of fire-killed and resprouting Banksia species in southwestern Australia. Australian Journal of Botany 43, 283–303.
CrossRef | open url image1

Lamont BB, van Leeuwen SJ (1988) Seed production and mortality in a rare Banksia species. Journal of Applied Ecology 25, 551–559.
CrossRef | open url image1

Lamont BB, Witkowski ETF (1995) A test for lottery recruitment among four Banksia species based on their demography and biological attributes. Oecologia 101, 299–308.
CrossRef | open url image1

Lamont BB, Enright NJ, Bergl SM (1989) Coexistence and competitive exclusion of Banksia hookeriana in the presence of congeneric seedlings along a topographic gradient. Oikos 56, 39–42.
CrossRef | open url image1

Lamont BB, Connell S, Bergl SM (1991a) Seed bank and population dynamics of Banksia cuneata: the role of time, fire and moisture. Botanical Gazette 152, 114–122.
CrossRef | open url image1

Lamont BB, Le Maitre D, Cowling RM, Enright NJ (1991b) Canopy seed storage in woody plants. Botanical Review 57, 277–317. open url image1

Lamont BB, Klinkhamer PGL, Witkowski ETF (1993a) Population fragmentation may reduce fertility to zero in Banksia goodii—a demonstration of the Allee effect. Oecologia 94, 446–450.
CrossRef | open url image1

Lamont BB, Witkowski ETF, Enright NJ (1993b) Post-fire litter microsites: safe for seeds, unsafe for seedlings. Ecology 74, 501–512.
CrossRef | open url image1

Lamont BB, Rees RG, Witkowski ETF, Whitten VA (1994a) Comparative size, fecundity and ecophysiology of roadside plants of Banksia hookeriana. Journal of Applied Ecology 31, 137–144.
CrossRef | open url image1

Lamont BB, Whitten VA, Witkowski ETF, Rees RG, Enright NJ (1994b) Regional and local (road verge) effects on size and fecundity in Banksia menziesii. Australian Journal of Ecology 19, 197–205. open url image1

Lamont BB, Wills RT, Witkowski ETF (1995) Threats to the conservation of southwestern Australian Proteaceae. Acta Horticulturae 387, 9–18. open url image1

Lamont BB, Marsula R, Enright NJ, Witkowski ETF (2001) Conservation requirements of an exploited wildflower: modelling growing condition, picking intensity and fire interval effects. Biological Conservation 99, 157–168.
CrossRef | open url image1

Lamont BB, He T, Enright NJ, Krauss SL, Miller BP (2003a) Anthropogenic disturbance promotes hybridization between Banksia species by altering their biology. Journal of Evolutionary Biology 16, 551–557.
CrossRef | PubMed |
open url image1

Lamont BB , Ward DF , Korczynskyj D , Colangelo WI , Fordham C , Clements E , Wittkuhn R (2003b) Believing the balga: a new method for gauging the fire history of vegetation using grasstrees. In ‘Fire in Southwestern Australian ecosystems: impacts and management’. (Eds N Burrows, I Abbott) pp. 147–170. (Backhuys: Leiden, The Netherlands)

Lamont BB, Wittkuhn R, Korczynskyj D (2004) Ecology and ecophysiology of grasstrees. Australian Journal of Botany 52, 561–582.
CrossRef | open url image1

McCredie TA, Dixon KW, Sivastithamparam K (1985) Variability in the resistance of Banksia L.f. to Phytophthora cinnamomi Rands. Australian Journal of Botany 33, 629–637.
CrossRef | open url image1

Milberg P, Lamont BB (1995) Fire enhances invasion of roadside vegetation in southwestern Australia. Biological Conservation 73, 45–49.
CrossRef | open url image1

Miller BP, Enright NJ, Lamont BB (2007) Range contraction, real and imagined, in Banksia hookeriana, a restricted endemic shrub of south-western Australia. Diversity and Distributions , open url image1

Muir BG (1985) Fire exclusion: a baseline for change? In ‘Fire ecology and management of Western Australian ecosystems’. Environmental Studies Group Report 12. (Ed. J Ford) pp.119–128. (WA Institute of Technology: Perth)

Pittock AB (1988) Actual and anticipated changes in Australia’s climate. In ‘Greenhouse: planning for climate change’. (Ed. GI Pearson) pp. 35–51. (CSIRO: Melbourne)

Scott JK (1982) The impact of destructive insects on reproduction in six species of Banksia L.f. (Proteaceae). Australian Journal of Zoology 30, 901–921.
CrossRef | open url image1

Shearer BL (1994) The major plant pathogens occurring in native ecosystems of southwestern Australia. Journal of the Royal Society of Western Australia 77, 113–122. open url image1

Shearer BL , Fairman RG (1991) Control of Phytophthora species in native communities with phosphorous acid. In ‘Conservation biology in Australia and Oceania, programme’. p. 72. (Centre for Conservation Biology, The University of Queensland: Brisbane)

Stearns SC (1992) ‘The evolution of life histories.’ (Oxford University Press: Oxford)

Taylor A , Hopper S (1988) ‘The Banksia atlas.’ Australian Flora and Fauna Series no. 8 (Australian Public Service: Canberra)

Thiele K, Ladiges PY (1996) A cladistic analysis of Banksia (Proteaceae). Australian Systematic Botany 9, 661–733.
CrossRef | open url image1

Van Leeuwen SJ (1997) Reproductive biology of Banksia tricuspis. PhD Thesis, Curtin University of Technology, Perth.

Van Leeuwen SJ , Lamont BB (1996) Florivory and its impact on reproductive success in Banksia tricuspis. In ‘Gondwanan heritage: evolution and conservation of the Western Australian biota’. (Eds SD Hopper, M Harvey, J Chappill, AS George) pp. 196–202. (Surrey Beatty: Sydney)

Ward DJ, Lamont BB, Burrows CL (2001) Grasstrees reveal contrasting fire regimes in eucalypt forest before and after European settlement of southwestern Australia. Forest Ecology and Management 150, 323–329.
CrossRef | open url image1

Wills RT (1991) Pathogenic fungi threaten the conservation of ecosystems of south-west Western Australia. In ‘Conservation biology in Australia and Oceania, programme’. p. 71. (Centre for Conservation Biology, The University of Queensland: Brisbane)

Wills RT (1993) The ecological impact of Phytophthora cinnamomi in the Stirling Range National Park, Western Australia. Australian Journal of Ecology 18, 145–159.
CrossRef | open url image1

Witkowski ETF, Lamont BB (1996a) Disproportionate allocation of mineral nutrients and carbon between vegetative and reproductive structures in Banksia hookeriana. Oecologia 105, 38–42.
CrossRef | open url image1

Witkowski ETF, Lamont BB (1996b) Nutrient losses from commercial picking and cockatoo removal of Banksia hookeriana blooms at the organ, plant and site levels. Journal of Applied Ecology 33, 131–140.
CrossRef | open url image1

Witkowski ETF, Lamont BB (1997) Does the rare Banksia goodii have inferior vegetative, reproductive or ecological attributes compared with its widespread co-occurring relative B. gardneri? Journal of Biogeography 24, 469–482.
CrossRef | open url image1

Witkowski ETF, Lamont BB (2006) Resilience of two Banksia species to global change: comparing results of climatic modelling, demographic and translocation studies. International Journal of Biodiversity Science & Management 2, 59–72. open url image1

Witkowski ETF, Lamont BB, Connell SJ (1991a) Seed bank dynamics of three co-occurring banksias in south coastal Western Australia: plant age, cockatoos, senescence and interfire establishment. Australian Journal of Botany 39, 385–397.
CrossRef | open url image1

Witkowski ETF , Lamont BB , Obbens F (1991 b) Utilization and conservation of Banksia hookeriana. In ‘Proceedings of the sixth international Protea conference’. Perth. pp. 251–265.

Witkowski ETF, Lamont BB, Obbens FJ (1994) Commercial picking of Banksia hookeriana in the wild reduces subsequent shoot, flower and seed production. Journal of Applied Ecology 31, 508–520.
CrossRef | open url image1

Wooller RD, Russell EM, Renfree MB, Towers PA (1983) A comparison of seasonal changes in the pollen loads of nectarivorous marsupials and birds. Australian Wildlife Research 10, 311–317.
CrossRef | open url image1

Wooller SJ, Wooller RD, Brown KL (2002) Regeneration by three Banksia species on the south coast of Western Australia in relation to fire interval. Australian Journal of Botany 50, 311–317.
CrossRef | open url image1

Zedler PH, Gautier CR, McMaster CS (1983) Vegetation change in response to extreme events: the effect of a short interval between fires in California chapparal and coastal scrub. Ecology 64, 809–818.
CrossRef | open url image1








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