A Fire‐Explicit Population Viability Analysis of <i>Hypericum cumulicola</i> in Florida Rosemary Scrub

Quintana‐Ascencio, Pedro F.; Menges, Eric S.; Weekley, Carl W.

doi:10.1046/j.1523-1739.2003.01431.x

Cited by 112 publications

(99 citation statements)

References 52 publications

(103 reference statements)

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“…As fires become more frequent, deterministic and stochastic population growth rates have been observed to increase in herbaceous species (Silva et al 1991;Canales et al 1994;Caswell and Kaye 2001;Quintana-Ascencio et al 2003), as well as decline in savanna woody species (Hoffmann 1999). In addition, intermediate patterns, where the population growth rate peaks at intermediate fire frequencies, have also been documented (Gross et al 1998).…”

Section: Demographic Responses To Firementioning

confidence: 91%

Assessing Sustainability of Nontimber Forest Product Extractions: How Fire Affects Sustainability

Sinha

Brault

2005

Biodivers Conserv

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Sustainable use of nontimber forest products (NTFPs) can be affected by levels of extractions as well as by other anthropogenic influences such as fire and grazing. We examined the effects of fire on the demography of Phyllanthus emblica, an important NTFP in the forests of Biligiri Rangan Hills, India. We then assessed demographic responses to the combined effects of fire and current fruit harvesting patterns. Fruits of Phyllanthus are commercially harvested by an indigenous forest dwelling people. Using matrix population models, we compared demographic indices across a chronosequence of time since last fire. Population growth rates (k) ranged from 0.7692 to 1.1443 across the five times since last fire. k was the lowest at times since last fire of 2 and 3 yr. Frequent fires increased time to maturity by altering growth and survival rates, thereby causing a demographic shift from growth to regressions or negative growth. Elasticity analysis revealed that stasis of adults makes the biggest contribution to k. Simulations of periodic and stochastic fire regimes suggest that higher k and population persistence can be achieved at firereturn intervals of ‡7 and ‡9 yr, respectively. These fire-return intervals became longer when the simulations included harvesting and fire. Extinction probabilities under the current fire regimes (every 2-3 yr) suggest that populations will decline to lower densities. Our findings provide critical information for developing guidelines for sustainable use and management of NTFPs in Biligiri Rangan Hills, and demonstrate the need to incorporate various human-generated physical regimes in assessing sustainability of NTFPs.

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Section: Demographic Responses To Firementioning

confidence: 91%

Assessing Sustainability of Nontimber Forest Product Extractions: How Fire Affects Sustainability

Sinha

Brault

2005

Biodivers Conserv

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“…Other studies also found different optimal fire intervals for populations of shrubs, but most of them agreed that, frequent burns decrease populations of woody species (e.g. Heelemann et al 2008;Quintana-Ascencio et al 2002;Satterthwaite et al 2002).…”

Section: Population Structure and Dynamicsmentioning

confidence: 94%

Population biology and regeneration of forbs and shrubs after fire in Brazilian Campos grasslands

et al. 2010

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Fire is an important factor in several ecosystems, affecting plant population biology. Campos grasslands are under constant influence of disturbance, mostly grazing and fire. However, few studies evaluated the effect of fire on plant population biology of grassland species. Therefore, we aim to analyze the effect of fire on the population biology of four species, from different functional groups and regeneration strategies: Chaptalia runcinata (forb, resprouter, absence of belowground organ), Vernonia flexuosa (forb, resprouter, presence of rhizophore), Eupatorium ligulaefolium (shrub, resprouter, presence of xylopodium) and Heterothalamus psiadioides (shrub, obligate seeder). Seven plots were established in different sites in southern Brazil: frequently burned (FB) and excluded from fire since 6 years (E). All plots were subjected to controlled burns during summer. Before experiments, populations were sampled. Further observations were carried out after 90 and after 360 days of fire experiments. In addition, we counted the number of seedlings and resprouters recruited after fire. Heat shock experiments were conducted with two species (H. psiadioides and V. flexuosa), as well as the study of the bud bank of the following species: E. ligulaefolium and V. flexuosa. The obligate seeder species had all individuals killed by fire and established only after 1 year. Resprouters, however, showed new stems immediately after fire. E. ligulaefolium and V. flexuosa showed only vegetative regeneration from belowground organs and more individuals in excluded sites 1 year after the fire. The bud bank of E. ligulaefolium tended to be larger in excluded sites, whilst V. flexuosa showed an opposite result. High temperatures did not enhance nor kill seeds from both studied species. Vegetative regeneration was the most important strategy for all studied species, except for H. psiadioides, the obligate seeder species. Fire thus, plays an important role on population structure and demography, being also important for plant recruitment.

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“…Fire may dramatically affect population dynamics of plants (reviewed in Noble and Slatyer 1980). Indeed, for most species, population dynamics have been shown to be very different in burned and unburned sites (e.g., Silva et al 1991, Canales et al 1994, Caswell and Kaye 2001, Garnier and Dajoz 2001a, Satterthwaite et al 2002, Quintana-Ascencio et al 2003, Menges and Quintana-Ascencio 2004. Fire has been shown to increase population growth rates by increasing seed production (McConnell and Menges 2002), seed germination rates (Canales et al 1994, Menges andDolan 1998), or growth (Lamont and Wiens 2003).…”

Section: Introductionmentioning

confidence: 99%

Fire Increases Invasive Spread of Molinia Caerulea Mainly Through Changes in Demographic Parameters

Jacquemyn

Brys

Neubert

2005

Ecological Applications

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Abstract. We investigated the effects of fire on population growth rate and invasive spread of the perennial tussock grass Molinia caerulea. During the last decades, this species has invaded heathland communities in Western Europe, replacing typical heathland species such as Calluna vulgaris and Erica tetralix. M. caerulea is considered a major threat to heathland conservation. In 1996, a large and unintended fire destroyed almost one-third of the Kalmthoutse Heide, a large heathland area in northern Belgium. To study the impact of this fire on the population dynamics and invasive spread of M. caerulea, permanent monitoring plots were established both in burned and unburned heathland. The fate of each M. caerulea individual in these plots was monitored over four years (1997)(1998)(1999)(2000). Patterns of seed dispersal were inferred from a seed germination experiment using soil cores sampled one month after seed rain at different distances from seed-producing plants. Based on these measures, we calculated projected rates of spread for M. caerulea in burned and unburned heathland. Elasticity and sensitivity analyses were used to determine vital rates that contributed most to population growth rate, and invasion speed. Invasion speed was, on average, three times larger in burned compared to unburned plots. Dispersal distances on the other hand, were not significantly different between burned and unburned plots indicating that differences in invasive spread were mainly due to differences in demography. Elasticities for fecundity and growth of seedlings and juveniles were higher for burned than for unburned plots, whereas elasticities for survival were higher in unburned plots. Finally, a life table response experiment (LTRE) analysis revealed that the effect of fire was mainly contributed by increases in sexual reproduction (seed production and germination) and growth of seedlings and juveniles. Our results clearly showed increased invasive spread of M. caerulea after fire, and call for active management guidelines to prevent further encroachment of the species and to reduce the probability of large, accidental fires in the future. Mowing of resprouted plants before flowering is the obvious management tactic to halt massive invasive spread of the species after fire.

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A Fire‐Explicit Population Viability Analysis of Hypericum cumulicola in Florida Rosemary Scrub

Cited by 112 publications

References 52 publications

Assessing Sustainability of Nontimber Forest Product Extractions: How Fire Affects Sustainability

Assessing Sustainability of Nontimber Forest Product Extractions: How Fire Affects Sustainability

Population biology and regeneration of forbs and shrubs after fire in Brazilian Campos grasslands

Fire Increases Invasive Spread of Molinia Caerulea Mainly Through Changes in Demographic Parameters

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