Pre-Dispersal Seed Losses, and the Survival of Seeds and Seedlings of Two Serotinous Banksia Shrubs in Burnt and Unburnt Heath

Zammit, Charles; Westoby, Mark

doi:10.2307/2260464

Cited by 44 publications

(28 citation statements)

References 32 publications

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“…Thus, contrary to our predictions, this species appears to have recruitment loosely coupled to fire. While this is consistent with evidence of successful inter-fire recruitment in this species as observed by Whelan et al (1998) and in some other canopy seed bank species (Zammit and Westoby 1987;Lamont and Enright 2000), it contrasts with findings for other Banksia species in the Sydney region, where establishment in sites three or more years post-fire was considerably poorer than in sites more recently burnt (Zammit and Westoby 1988).…”

Section: Seedling Emergencesupporting

confidence: 85%

The coupling of recruitment and disturbance by fire in two resprouting Proteaceae species

Denham

Whelan

Auld³

et al. 2010

Plant Ecol

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Recruitment in plant populations is often tightly coupled to major disturbances such as fires. For species with persistent seed banks, fire-related cues may allow or enhance germination. The litter layer influences germination and may modify the impact of seed predators on seeds and seedlings. The litter layer is obviously affected by fire, providing one mechanism by which disturbance can determine recruitment. We tested the role of litter in the disturbance-recruitment coupling of two species with contrasting seed release timing after fire-Banksia serrata (canopy seed bank) and Telopea speciosissima (transient seed bank) by planting their seeds both early and late in the post-fire recruitment period (PRP) and manipulating litter density in orthogonal treatments. Vertebrate seed predators were excluded. Both species established more seedlings late in the PRP, although results were strongly influenced by very poor establishment at one site. Invertebrate seed predators consumed more T. speciosissima seeds in sites early (69.5%) than late in the PRP (51.2%), while consumption of B. serrata seeds was lower overall and comparable across sites (average 47.3%). Surprisingly, litter had very little effect on establishment and none on invertebrate seed predation, suggesting that other factors are more important. Recruitment was only loosely coupled to disturbance for the canopy seed bank species; for the transient seed bank species, the coupling was tighter but separated in time from the disturbance. Understanding both the strength and temporal aspects of the disturbance-recruitment coupling is necessary for appropriate management of plant functional diversity in fire-prone habitats.

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Section: Seedling Emergencesupporting

confidence: 85%

The coupling of recruitment and disturbance by fire in two resprouting Proteaceae species

Denham

Whelan

Auld³

et al. 2010

Plant Ecol

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“…Cowling and Lamont (1985) found, using quantitative measures of serotiny, that within species, shrub forms (shrubland habitat) were more serotinous than arborescent forms (forests) and attributed this to differences in fire intensity (low scorch heights in forests) and the favourability of conditions for interfire establishment in the two habitats (forests more mesic and hence more favourable for interfire establishment). Similarly, Zammit and Westoby (1988) found higher levels of seed retention in B. ericifolia (obligate seeder, shrub) compared with B. oblonglfolia (resprouting shrub) within populations from the Sydney region. George (1981) concluded that weak serotiny and an arborescent habit were coincident in a large number of resprouting Banksia species.…”

Section: Effects Of Frequent Firesmentioning

confidence: 77%

Demography of woody plants in relation to fire: Banksia serrata Lf. and Isopogon anemonifolius (Salisb.) Knight

Bradstock

1990

Australian Journal of Ecology

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Banksia serrata and Isopogon anemonifotius are serotinous resprouters (single-stemmed tree, multi-stemmed shrub, respectively) found in forests within the Sydney region. Studies were conducted to predict the population dynamics of these species. Seed production and survival and the accumulation of seed-hank within cones were estimated in relation to time since fire. Emergence, survival and development oflignotubers were measured in young juveniles and the time taken to reach adulthood was estimated. This Information and published data on survival were used to estimate the amount of recruitment of adults and juveniles necessary for stands to remain in a stable state under frequent (50years), though the density of resprouter populations may slowly decline under such fire regimes.

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“…In Mediterranean fire-prone ecosystems, the enhanced germination and seedling establishment observed in the wet season following wildfires has been referred to as a fire-adaptive response (Zammit and Westoby, 1988;Moreno and Oechel, 1991;Keeley, 1994;Keeley and Bond, 1997). Temperature is the most important environmental factor involved in the softening of hard seeds (Baskin and Baskin, 1989) and heat treatments simulating wildfires have resulted in a strong increase of the germination of many Mediterranean species (Auld and O'Connell, 1991;Thanos et al, 1992; see also review in Keeley, 1994).…”

Section: Germination Ecology Of U Parviflorusmentioning

confidence: 99%

Germination of an obligate seeder (Ulex parviflorus) and consequences for wildfire management

Baeza

Roy

2008

Forest Ecology and Management

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Pre-Dispersal Seed Losses, and the Survival of Seeds and Seedlings of Two Serotinous Banksia Shrubs in Burnt and Unburnt Heath

Cited by 44 publications

References 32 publications

The coupling of recruitment and disturbance by fire in two resprouting Proteaceae species

The coupling of recruitment and disturbance by fire in two resprouting Proteaceae species

Demography of woody plants in relation to fire: Banksia serrata Lf. and Isopogon anemonifolius (Salisb.) Knight

Germination of an obligate seeder (Ulex parviflorus) and consequences for wildfire management

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