Are Fabiana imbricata shrublands advancing over northwestern Patagonian grasslands? A population dynamics study involving fire and precipitation

Curth, Mónica I de Torres; Ghermandi, Luciana; Biscayart, Carolina

doi:10.1016/j.jaridenv.2012.03.011

Cited by 10 publications

(5 citation statements)

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“…In agreement with the mathematical models that indicate that F. imbricata shrublands are growing in relation to fire (de Torres Curth et al 2012;Ghermandi et al 2010), fire cues stimulated the germination of F. imbricata, indicating a direct effect of fire in the species recruitment by stimulating germination and/or releasing dormancy. The permeability to water that F. imbricata seeds showed indicates that the seed coat is not imposing physical dormancy by restricting water uptake.…”

Section: Discussionsupporting

confidence: 86%

“…Fabiana imbricata Ruiz et Pavon (Solanaceae) is a native shrub characteristic of the ecotone between woody ecosystems and steppes in northwestern Patagonia (Argentina). This species is very important in the grassland dynamics because its encroachment related to fire (de Torres Curth et al 2012) can change vegetation physiognomy and ecosystem processes. The spatial configuration of F. imbricata is related to fire, soil topography, and hydrography (Oddi et al 2010).…”

Section: Introductionmentioning

confidence: 99%

“…However, and even though this species does not resprout after fires, it shows a high recruitment from seeds during post-fire succession (Ghermandi et al 2004. Mathematical models that analyze F. imbricata population dynamics at different fire frequencies and at different values of precipitation indicate that F. imbricata population is advancing over the grassland and that it grows at a wide range of fire frequencies, reaching its maximum with a fire frequency of once every 6-10 years (de Torres Curth et al 2012;Ghermandi et al 2010). According to this, fire followed by a wet spring seems to be the best scenario for F. imbricata recruitment .…”

Section: Introductionmentioning

confidence: 99%

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Fire as a stimulant of shrub recruitment in northwestern Patagonian (Argentina) grasslands

Dudinszky

Ghermandi

2013

Ecological Research

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One strategy of plant survival during post‐fire succession is to persist and regenerate by recruiting new individuals from a fire‐resistant seed bank. The heat, smoke, and charcoal released during plant combustion may act (individually or in combination) as a cue for post‐fire seed germination. Fabiana imbricata is a shrub that forms persistent seed banks in the northwestern Patagonian grasslands and shows a high recruitment from seeds during post‐fire succession. Mathematical models showed that this species is advancing over the grasslands in response to fires. To corroborate these findings, we studied the role of fire on F. imbricata seed germination. In order to achieve this, a factorial experiment was designed in laboratory conditions to study the effect of heat, charcoal, smoke, scarification, and their interactions on F. imbricata seed germination. Seeds treated with the higher temperatures required a longer period of time to germinate, thus, significantly affecting the mean germination time. Total germination percentages in F. imbricata were significantly enhanced by smoke and scarification, but the interaction of heat, smoke, and scarification was more important than the effect of each fire factor alone. The positive response to fire cues exhibited by F. imbricata indicates that this species would have an adaptive advantage to colonize these grasslands if fire frequency increased, as predicted for this environment. Hence, fire will contribute to the grassland encroachment by this species and, therefore, to the loss of biodiversity and productivity of northwestern Patagonian grasslands.

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Section: Discussionsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fire as a stimulant of shrub recruitment in northwestern Patagonian (Argentina) grasslands

Dudinszky

Ghermandi

2013

Ecological Research

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“…Los incendios naturales son importantes fuerzas ecológicas y evolutivas. En muchos ecosistemas, el fuego regula la estructura y composición de las comunidades vegetales (Biganzoli et al 2009;Torres Curth et al 2012). Sin embargo, las actividades humanas han alterado la frecuencia y la intensidad de los incendios (Di Bella et al 2006), y estos cambios pueden afectar de forma negativa los ecosistemas.…”

Section: I��unclassified

Enmienda con compost y fertilización de suelos afectados por incendios: Respuesta de dos especies nativas de la Patagonia bajo condiciones de invernadero

2020

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R��.Las actividades humanas alteraron la frecuencia y la intensidad de los incendios, lo cual puede tener consecuencias severas sobre los ecosistemas terrestres. Se sugiere que aplicar enmiendas y trasplantar especies nativas serían alternativas exitosas para recuperar zonas incendiadas. En la región andina de la Patagonia Argentina se produce compost de biosólidos que se podría usar a tal fin. Sin embargo, se conoce poco sobre el efecto de estas enmiendas orgánicas en el crecimiento de las plantas nativas. El objetivo del trabajo fue evaluar la respuesta al agregado de compost y la fertilización nitrogenada de dos especies nativas: ciprés (Austrocedrus chilensis) y roble (Nothofagus obliqua), cultivadas en un sustrato volcánico forestal afectado por un incendio. Después de 4 años se observó que el efecto de los tratamientos (en la planta y en el suelo) dependió de la especie. El efecto principal del compost fue un aumento marcado en la disponibilidad de fósforo en los suelos. El roble incrementó su biomasa y modificó parámetros arquitecturales en respuesta a la fertilización nitrogenada, pero no presentó cambios ante la adición de compost. El ciprés, por el contrario, no respondió a la fertilización nitrogenada, pero sí incrementó su biomasa en el tratamiento con compost y fertilización. Es posible que agregar nitrógeno haya favorecido la absorción de nutrientes que aporta el compost, como fósforo, calcio y magnesio.

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“…For example, effects of the timing of flooding recession and precipitation were evaluated with deterministic and stochastic matrix population models on the population dynamic of Boltonia decurrens (Smith et al, 2005). In addition, the effects of different fire frequencies, and variations in spring precipitation levels, were studied with stochastic models on the population dynamic of Fabiana imbricate (Curth et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Effects of precipitation changes on the dynamics of sparse elm woodland in Northeastern China

Tang¹,

Busso²

2018

Biocell

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Elm (Ulmus pumila L.) is the dominant tree species in the sparse elm woodland, the original vegetation in the Horqin Sandy Land. The effects of changes in precipitation on U. pumila trees have not been fully studied. We determined a dynamic model by considering the five stages in the U. pumila life cycle, i.e. seed, seedling, and juvenile, mature and over-mature tree stages. The effects of changes in precipitation on population density and age structure were then evaluated. Population density, after averaging all study developmental morphology stages, ranged from 16.67 individuals/m 2 to 25.01 individuals/m 2 under a mean annual precipitation (MAP) of 80% to 120%, respectively. This suggests that population density could increase as MAP also increased. The proportion of seedlings, and juvenile, mature and over-mature trees were 95.23%, 4.58%, 0.19% and 0.01%, respectively, under all precipitation levels. This indicates that precipitation had little effects on the developmental stages of the studied U. pumila populations in the Horqin Sandy Land. Additional water supply might be provided in addition to the natural rainfall that occurs in the region, for contributing to maintain U. pumila population density in the Horqin Sandy Land.

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Are Fabiana imbricata shrublands advancing over northwestern Patagonian grasslands? A population dynamics study involving fire and precipitation

Cited by 10 publications

References 45 publications

Fire as a stimulant of shrub recruitment in northwestern Patagonian (Argentina) grasslands

Fire as a stimulant of shrub recruitment in northwestern Patagonian (Argentina) grasslands

Enmienda con compost y fertilización de suelos afectados por incendios: Respuesta de dos especies nativas de la Patagonia bajo condiciones de invernadero

Effects of precipitation changes on the dynamics of sparse elm woodland in Northeastern China

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