The ecological significance of canopy seed storage in fire-prone environments: a model for non-sprouting shrubs

  title={The ecological significance of canopy seed storage in fire-prone environments: a model for non-sprouting shrubs},
  author={Neal J. Enright and Ralf Marsula and Byron B. Lamont and Christian Wissel},
  journal={Journal of Ecology},
1 A comprehensive data set on age, survival and reproduction for the non-sprouting (fire-killed) shrub Banksia hookeriana, encompassing 13 years of measurements at 15 sites in south-western Australia, and including 10 fires, was used to parameterize a computer model to investigate optimum plant life-history strategies in a fire-prone environment. Parameter ranges encompassed life-history information for other nonsprouting Banksia species from the same region. 2 The relationship between fire… 

Figures and Tables from this paper

Optimal resource allocation in a serotinous non‐resprouting plant species under different fire regimes
The aim is to predict optimal age-specific reproductive schedules in a perennial, serotinous species, when cone maintenance is costly, and it is found that, whenever maximal plant survival probability is low, the optimal strategy consists in reducing resource allocation to seed maintenance while increasing resource allocations to annual seed production.
Timing of fire relative to seed development may enable non-serotinous species to recolonize from the aerial seed banks of fire-killed trees
The existence of non-serotinous, non-sprouting species in fire regimes where serotiny confers an adaptive advantage is puzzling, particularly when these species recruit poorly from soil seed banks or
Effects of inter‐fire intervals on the reproductive output of resprouters and obligate seeders in the Proteaceae
The results highlight the need to take into account past fire frequency at a site, in addition to time since the last fire, when planning prescribed fires.
Timing of fire relative to seed development controls availability of non-serotinous aerial seed banks
The existence of non-serotinous, non-sprouting species in fire regimes where serotiny confers ~n adaptive advantage is puzzling, particularly when these species recruit poorly from soil seed banks or
A spatial model of coexistence among three Banksia species along a topographic gradient in fire‐prone shrublands
A spatially explicit, rule-based model for three co-occurring Banksia species was developed to investigate coexistence mediating processes in a fire-prone shrubland in western Australia and coexistence appears to be highly dependent upon the mean interfire period in combination with subtle gradients associated with fire propagation and recruitment conditions.
Non-fire induced seed release ina weakly serotinous pine: climatic factors, maintenance costs or both?
Drought decreased the production of conelets, increased the abortion of immature cones, reduced the seed quality in the cohorts of cones produced during these years, and increased the opening of serotinous cones, suggesting that not only passive changes induced by drought but also competition among cones for resources might be involved in this process.
Fire-mediated disruptive selection can explain the reseeder–resprouter dichotomy in Mediterranean-type vegetation
A stochastic demographic model is developed to assess determinants of relative fitness of reseeders, resprouters and hypothetical intermediate forms and suggests that a strong dichotomy in fire survival strategy depends on a non-linear trade-off between growth and fire persistence traits.
Long inter‐fire intervals do not guarantee a large seed bank in a serotinous shrub (Banksia spinulosa Sm.)
It is often assumed that long‐lived woody perennials with canopy‐stored seed banks steadily accumulate seeds over time since fire. Trends in flowering and fruiting have usually been inferred from
Fire, soil fertility and delayed seed release: a community analysis of the degree of serotiny
The spectrum of serotiny (weak to strong) in these communities is proposed to be driven by the interactive effect of both fire and soil nutrients on the selection for delayed seed dispersal.


Canopy seed bank dynamics and optimum fire regime for the highly serotinous shrub, Banksia hookeriana
Evidence of the natural fire frequency to which the species is best adapted was sought through analysis of its seed demography using a computer model of canopy seed bank dynamics based on field data, which indicates a human impact on the naturalFire regime which may ultimately threaten the species.
Seed Bank and Population Dynamics of Banksia cuneata: The Role of Time, Fire, and Moisture
It is concluded that population numbers are not limited by the size and dynamics of the canopy seed bank but by the weather pattern following fire-induced seed release.
Post-fire recruitment and mortality in a population of the mallee Eucalyptus incrassata in semi-arid, south-eastern Australia
A study of the population dynamics of yellow mallee, Eucalyptus incrassata, based upon the life-stage approach revealed, contrary to previous speculation, that the populations are not static under present conditions, and recruitment events are widely spaced in time, imparting a steady-state appearance to mallee populations.
Predator Satiation and Site Alteration Following Fire: Mass Reproduction of Alpine Ash (Eucalyptus Delegatensis) in Southeastern Australia
Parallels in seed storage, postdispersal seed predation, and regeneration following fire in Eucalyptus and Pinus suggest that postdisPersal seed predators are important selective agents in the evolution of seed storage and induction of mass seed release by fire.
Seed Bank Dynamics of a Serotinous, Fire-sensitive Banksia Species
Comparison of 25 reproductive attributes between B. burdettii and another two Banksia species occurring in the vicinity indicated that it has much in common with these serotinous, non-sprouters.
Seed Bank Dynamics of Four Co-Occurring Banksia Species
With the exception of lower follicle set in the two species which re-sprout after fires, there was no support for the hypothesis that such species would allocate less energy to sexual reproduction than the two non-sprouting species.
Post-Fire Recruitment of Four Co-Occurring Banksia Species
Significantly fewer seedlings died inside enclosures after the autumn burn than in the unburnt site, indicating the importance of drought-induced mortality in maintaining even-aged populations in mature scrub-heath.
Recruitment variability in the resprouting shrub Banksia attenuata and non-sprouting congeners in the northern sandplain heaths of southwestern Australia
Seed production, seed availability, seedling recruitment and water relations (xylem pressure potential, stomatal conductance) in Banksia attenuata were studied from the base (swale) to the crests of
The hypothesis that fire imposes differential selective pressures on serotiny in jack pine is supported by the results of evaluation in populations from two adjacent landscapes in the southern part of the Canadian boreal forest.
Simulation of the Effect of Spatial and Temporal Variation in Fire Regimes on the Population Viability of a Banksia Species
Populations of plants that rely on seeds for recovery from disturbance by fire (obligate seeders) are sensitive to regimes of frequent fire. Obligate seeders are prominent in fire-prone heathlands of