How do fire and harvesting affect the population dynamics of a dominant endemic Velloziaceae species in campo rupestre?

Souza, Jumara Marques; Schmidt, Isabel Belloni; Conceição, Abel Augusto

doi:10.1016/j.flora.2017.02.007

Cited by 17 publications

(16 citation statements)

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“…, Souza et al. ). Few studies, however, have disentangled their individual and interactive effects on plant populations (Ehrlén et al.…”

Section: Discussionmentioning

confidence: 98%

“…Fire severity, soil moisture, available light, and non-timber forest product harvest are important drivers of plant population dynamics (Johnstone and Chapin 2006, Albrecht and McCarthy 2009, Gaoue and Ticktin 2010, Mandle et al 2015, Souza et al 2018. Few studies, however, have disentangled their individual and interactive effects on plant populations (Ehrl en et al 2016).…”

Section: Discussionmentioning

confidence: 99%

“…In the Pacific Northwest of the United States, some forest vegetation zones are experiencing larger fire extent and/or greater proportions of high-severity forest fire than in the recent past (Reilly et al 2017). For fire-adapted plants, these changes could have dramatic impacts on population viability, but these effects have rarely been evaluated (Canales et al 1994, Quintana-Ascencio et al 2003, Souza et al 2018.…”

Section: Introductionmentioning

confidence: 99%

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Fire, leaf harvest, and abiotic factors drive demography of an ecologically and culturally important understory plant

Hart-Fredeluces

Ticktin

2019

Ecosphere

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Understanding how multiple simultaneous drivers interact to influence plant demography is critical for protecting plant diversity in the context of global change. Fire is a key disturbance in forested ecosystems, but the interactive effects of fire and other abiotic and management factors on understory plants are poorly understood. Beargrass (Xerophyllum tenax) is perennial herb that provides food, habitat, and nesting material for a wide range of animals. Beargrass populations are prescribe‐burned by Native American experts, and leaves are subsequently harvested at low‐intensity for use in weaving. Leaves for weaving are reportedly becoming harder to find due to lack of fire and competition with commercial harvesters. To elucidate the effects of fire and its interactions with leaf harvest and abiotic factors on beargrass populations, we collected demographic data on more than 1000 individuals over three years across fire severities in combination with individual‐level soil moisture and light measurements. We also conducted an experiment simulating low‐intensity leaf harvest. We built mixed‐effects models to test our predictions that fire would increase growth and reproduction, and that it would mediate the effects of soil moisture and leaf harvest on beargrass growth. Fire increased growth as well as sexual and vegetative reproduction, providing evidence that beargrass is fire‐adapted. Leaf harvest both reduced survival probability and increased the probability of vegetative reproduction. Individual growth increased with early growing season soil moisture in unburned and low‐severity fire areas but did not vary with soil moisture in high‐severity areas. In sum, fire is a key driver of beargrass demography and fire interacted with other factors to influence beargrass vital rates. Understanding the impacts of changes to management and abiotic factors on understory species such as beargrass, and the ecosystem services they provide, requires attention to interactions among multiple environmental factors.

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“…, Souza et al. ). Few studies, however, have disentangled their individual and interactive effects on plant populations (Ehrlén et al.…”

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fire, leaf harvest, and abiotic factors drive demography of an ecologically and culturally important understory plant

Hart-Fredeluces

Ticktin

2019

Ecosphere

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“…The influence of fire on plant populations depends on the relationship of plant demography to fire characteristics, including fire frequency, severity and timing (Chappell & Agee, 1996;Emery & Gross, 2005;Souza et al, 2018). In some cases, lack of fire threatens the persistence of plants that have evolved responses to the direct or indirect effects of fire (Caswell & Kaye, 2001;Keeley & Zedler, 1978;Quintana-Ascencio et al, 2003;Souza et al, 2018; Werner & Peacock, 2019). Fire-adapted plants are also of critical importance to many Indigenous Peoples as fire-dependent cultures (Lake & Christianson, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…As human interventions and human-mediated stressors increasingly replace natural disturbances with global change, there is a need to better understand disturbance interactions (Didham et al, 2007). This understanding can be advanced by comparing and contrasting findings from studies that explore interactions of fire with human harvest (Darabant et al, 2016;Mandle & Ticktin, 2012;Sinha & Brault, 2005;Souza et al, 2018) with those that explore interactions of fire with herbivory or grazing (Bailey & Whitham, 2002;Giljohann et al, 2017;Mandle et al, 2015;Paniw et al, 2017;Tye et al, 2016;Vinton et al, 1993).…”

Section: Introductionmentioning

confidence: 99%

Simulated Indigenous fire stewardship increases the population growth rate of an understorey herb

2020

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1. Understanding how plant populations respond to multiple drivers is increasingly critical for biodiversity conservation under global change. Indigenous knowledge can provide guidance for sustainable management, but the outcome of its application in novel ecosystems is rarely known. Simulating the re-introduction of Indigenous stewardship in contemporary contexts with population models allows for the comparison of different management scenarios and the elucidation of the mechanisms driving population outcomes. 2. Beargrass Xerophyllum tenax is an ecologically and culturally important understorey plant managed through fire and leaf harvest by Native Americans. We collected demographic and abiotic data on beargrass over 3 years across fire severities in nine populations and conducted an experiment to simulate Native American leaf gathering. These data were used to build integral projections models (IPMs) with soil moisture and light availability as covariates. With these IPMs, we simulated stochastic population growth rates across future fire and leaf harvest scenarios. We then decomposed our simulation results using stochastic life table response experiments (SLTREs). 3. The 'no fire' and 'business as usual' (180-year fire return interval, 58% probability of high-severity fire) scenarios resulted in lower population growth rates than 'Indigenous fire stewardship' (10-year fire return interval, 10% chance of high-severity fire). SLTREs revealed that Indigenous stewardship led to higher beargrass population growth rates due to greater fire frequency, higher adult survival and increased vegetative reproduction. Fire also interacted with harvest in the simulations; leaf harvest increased population growth rate only in combination with Indigenous fire stewardship. 4. Synthesis. Stochastic and retrospective population dynamics tools combined with an understanding of Indigenous management practices allow for the comparison of future socio-ecological scenarios as well as mechanistic understanding of differences between scenarios. Simulated Indigenous stewardship supported the long-term persistence of X. tenax populations while business as usual and no fire did not. The benefits of Indigenous stewardship to population dynamics, and the complexity of interactive effects of multiple drivers, provide further impetus for collaboration across Indigenous and western knowledge systems. Xerophyllum tenax is presented as a model system to explore the influence of Indigenous stewardship, or its absence, on population dynamics. IPM matrix component Underlying regression models and values Model main effects and interactions, and constant rates a Random effects structure e Non-seedlings s(x, θ) Probability of survival (nonseedlings), binomial error, logit link Year 0-1: fire-severity class, canopy openness × log size Year 1-2: fire-severity class, log size Year 2-3: fire-severity class × log size, leaf harvest × log size Plot within site g(y, x, θ) Growth (non-seedlings), Gaussian error Year 0-1: fire-severity class × log size Year 1-...

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Impact of disturbance on biomass, carbon, and nitrogen storage in vegetation and on soil properties of tropical dry deciduous forest in Chhattisgarh, India

et al. 2022

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The tropical deforestation due to biotic interference, land use change, and population explosion in Asian countries has attracted the global concern with respect to conservation and protection of forest resources. Indian soils are limited in terms of nutrient reserves and organic matters. Our present study deals the influence of disturbance on phytosociology, vegetation carbon (C), and nitrogen (N) along with soil properties of tropical deciduous forest in Chhattisgarh. The stratified random sampling technique was used for quantifying the vegetation. Results revealed that 43.75% species are rare in occurrence in undisturbed forest (UF), and in disturbed forest (DF) about 50% species showed rarity over the area as per the Raunkiaer frequency class of species rarity and commonness. Total density and basal cover were 1090 trees ha À1 and 28.16 m 2 ha À1 , respectively. in UF and was 190 trees ha À1 and 10.99 m 2 ha À1 in DF. The disturbance resulted into 31.63% loss in total biomass in DF compared to UF. The increasing disturbances are altering the forests attributes in terms of poor standing stock, basal area, and diversity in DF. The concentration of dominance and beta diversity value was higher in DF. It may be increased due to influx of generalist species in DF. Stand biomass was found to be 3-times higher in UF than the DF. Higher value of C and N stock and soil nutrient were found in UF. Thus, proper conservation, protection, and restoration of these forests should be the priority to improve the C pool and ecological services.

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How do fire and harvesting affect the population dynamics of a dominant endemic Velloziaceae species in campo rupestre?

Cited by 17 publications

References 46 publications

Fire, leaf harvest, and abiotic factors drive demography of an ecologically and culturally important understory plant

Fire, leaf harvest, and abiotic factors drive demography of an ecologically and culturally important understory plant

Simulated Indigenous fire stewardship increases the population growth rate of an understorey herb

Impact of disturbance on biomass, carbon, and nitrogen storage in vegetation and on soil properties of tropical dry deciduous forest in Chhattisgarh, India

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