Jorgelina Franzese

• Dr
• Researcher at Instituto de Investigaciones en Biodiversidad y Medioambiente, Bariloche, Argentina

In Argentina, near the Sierra de los Comechingones, the exotic tree P. halepensis has been used mainly as an ornamental garden tree for more than a century. However, a few years ago, scattered populations began to be observed on the slopes of the hills, which are growing rapidly. The objective of this study was to evaluate changes in the amount and...

Plant fire ephemerals are well-adapted to fire-prone environments, with germination strategies linked to fire-related cues like smoke. Germination requirements linked to fire cues in Patagonian fire ephemerals are poorly studied, with no research on the effects of smoke water (SW) and smoke isolated karrikinolide (KAR) on their germination. We asse...

Natural plant communities are highly vulnerable to invasion by neighboring invasive species. Understanding how litter influences invasive species establishment is essential for assessing its impact on invasion. We conducted a field experiment to investigate how litter context, related to disturbance and habitat type, affects the seed longevity of P...

Aim The soil seed bank, an ecosystem component with a crucial role in the natural regeneration of plant communities, can be impacted by invasive non‐native plants. The impact of non‐native plants can be direct with the production of their own seeds or indirect without producing seeds, which has been less investigated. We determined the impact of an...

Pine invasions in South America commonly modify fire regimes by changing habitat fuel characteristics, but studies have often overlooked cones as a fuel component. In South America, cones are a novel and unique fuel type, especially those from serotinous pines. Despite their significant contribution, their role as canopy fuels and firebrands has no...

Aim: The soil seedbank, an ecosystem component with a crucial role in the natural regeneration of plant communities, can be impacted by invasive non-native plants. Their impact can be direct with the production of their own seeds or indirect without producing seeds, which has been less investigated. We determined the impact of an invasive seedless...

El banco de semillas tiene un rol crucial en la regeneración natural de las comunidades vegetales y en la evaluación de su potencial de restauración, especialmente frente a posibles disturbios. El banco puede ser afectado por plantas no nativas invasoras, que pueden impactarlo tanto de manera directa, a través de la producción de sus propias semill...

Earth harbours an extraordinary plant phenotypic diversity¹ that is at risk from ongoing global changes2,3. However, it remains unknown how increasing aridity and livestock grazing pressure—two major drivers of global change4–6—shape the trait covariation that underlies plant phenotypic diversity1,7. Here we assessed how covariation among 20 chemic...

In arid and semi-arid environments, demographic processes of shrubs are affected by fire and precipitation. Understanding the impact on the demographic processes of the population is crucial for ecosystem conservation and management. Our aim was to assess the population dynamics of the native shrub Senecio bracteolatus and its relation to fire freq...

Perennial plants create productive and biodiverse hotspots, known as fertile islands, beneath their canopies. These hotspots largely determine the structure and functioning of drylands worldwide. Despite their ubiquity, the factors controlling fertile islands under conditions of contrasting grazing by livestock, the most prevalent land use in dryla...

Evolutionary forces such as genetic drift and natural selection operate during the process of biological invasion. More specifically, nonnative populations suffer genetic and demographic bottlenecks, and are exposed to new environmental, climatic and biotic filters. Thus, neutral and/or adaptive drivers may contribute to genetic differentiation of...

The benefits of early detection of biological invasions are widely recognized, especially for protected areas (PAs). However, research on incipient invasive plant species is scarce compared to species with a recognized history of invasion. Here, we characterized the invasion status of the non-native conifer Juniperus communis in PAs and interface a...

Germination rate and seedling establishment control post-fire regeneration of trees and may foster invasion of exotic species particularly of fire-adapted species as the serotinous Pinus radiata. We analyzed the influence of heat shock and the presence of ash as substrate on seed germination and early vigor of seedlings of distinct cohorts of P. ra...

In arid environments where soil resources are limiting factors, the presence of soil ecosystem engineers that create new enriched soil habitats can improve the performance of non-native plants growing there. Moreover, these enriched areas may be considered key sources of high-quality seeds, which would favor the spread and invasion success of non-n...

The introduction of non-native pine plantations and subsequent pine invasion are increasingly affecting native and high conservation value forests in the Southern Hemisphere. Pine invasion changes forest fire regimes, even in protected areas. However, most research evaluating the impact on fuel of this invasion on South American habitats has focuse...

Early competition between native and non-native species can greatly influence ecosystem integrity through its effect on species regeneration, which can be further modulated by environmental context. Bromus tectorum (cheatgrass, winter annual grass) has recently invaded the temperate grasslands of Patagonia Argentina ecosystems mainly used for exten...

Espíritu y origen de este documento Este documento tiene por finalidad sintetizar y poner a disposición información existente para guiar tareas de restauración ecológica, en zonas afectadas por incendios en la Comarca Andina del Paralelo 42, que sean emprendidas principalmente por vecinos a escala predial. La Comarca Andina es el conglomerado urban...

Se evaluó cómo la intensidad del fuego y la procedencia del suelo afectan el desarrollo temprano y la micorrización por hongos ectomicorrícicos de plántulas de N. antarctica y P. contorta. Para esto se realizó un ensayo de vivero en el que se cultivaron plántulas de ambas especies forestales en suelo de dos tipos (Matorral nativo / Plantación de pi...

Biological invasions are considered a major problem for nature conservation globally. Natural resource managers make immense efforts to control invasions. However, many management strategies depend on public support. In this study, we assessed how recreational users perceive the conservation level of a protected area where the native forest has bee...

Exotic species storing seeds in the canopy (serotinous species) can experience a clear advantage in fire-prone communities that lack native taxa with such fire-resistant traits. In addition, selection in the new environment can potentially increase the frequency of fire-adapted characteristics such as serotiny. We studied the potential role of fire...

Aims: Changes in land cover resulting from the introduction of non-native pine plantations and subsequent pine invasion is increasingly affecting forest areas in the Southern Hemisphere, and having negative impacts on diverse ecosystem components. We studied the abundance, biophysical attributes, and flammability of litter in temperate forests modi...

Introduction Long- term ecological monitoring is required for understanding population dynamics. Vegetation changes in arid and semi-arid ecosystems generally occur in the short- term in response to rainfalls and in the long-term in response to rare events (fires, volcanic eruptions). For developing management strategies for sustainable animal pro...

Incendios frecuentes pueden seleccionar atributos que beneficien el éxito reproductivo de aquellas especies con estrategias de tipo reclutadora post-fuego.Pinus radiata, una especie invasoraen Patagonia con este tipo de estrategia, presenta un banco de semillas aéreo que se libera luego de incendios (serotinia). Por ende, la dispersión de sus semil...

Varias de las especies de pináceas plantadas con fines forestales en el noroeste patagónico son altamente invasoras. Dada la asociación de varias pináceas, tales como Pinus radiata, a altas frecuencias de incendios en su distribución original, su implantación en nuestra región aumentaría la probabilidad de incendios e invasión postfuego, selecciona...

Las plantaciones de pino quemadas representan una importante fuente de propágulos que puede devenir en invasiones densas, ocasionando una severa degradación del hábitat. Esto destaca la necesidad de evaluar la efectividad de los métodos de control de la invasión y de la restauración de las áreas afectadas. Durante 4 años evaluamos el éxito de la re...

Las invasiones producen cambios en las características del combustible (carga, tipo y continuidad) que pueden modificar la probabilidad de ignición y propagación del fuego en las comunidades vegetales. En este trabajo analizamos el impacto que tiene la invasión de pinos en sistemas de bosques templados del NO de la Patagonia sobre el combustible fi...

INTRODUCCIÓN En los pastizales luego de un incendio la riqueza de especies aumenta por la aparición de hierbas fugitivas nativas. En el humo derivado de la combustión de la vegetación se encuentra un karrikinolide, que es el responsable de estimular la germinación de semillas de varias especies. Esta sustancia actúa a muy bajas concentraciones y ha...

Las invasiones de plantas pueden modificar no sólo aspectos fisonómico-florísticos de las comunidades naturales sino también propiedades inherentes a las mismas como su inflamabilidad, produciendo, en muchos casos, serias consecuencias sobre el ambiente y la actividad económica de los pobladores rurales. En este trabajo determinamos los cambios en...

Tras los incendios forestales que afectaron a la Reserva de Usos Múltiples Lago Epuyén en 2012 y 2015, la Subsecretaría de Bosques de la provincia de Chubut implementó tareas de restauración. Una de las mayores complicaciones es la invasión de coníferas exóticas que compiten fuertemente con los plantines de ciprés de la cordillera instalados medien...

Title. Do we perceive the environmental damage? Visitors’ perceptions about Patagonian-Forests’ changes. Protected natural areas have the double purpose of conserving nature and increasing life quality for humans by promoting active lifestyles through recreation in connexion with nature. Some economic and recreational activities can have environmen...

In the last decades, the fire has affected large pine plantations in Patagonia, being recurrent in some areas invaded by pines. The positive feedback fire-invasion results in a new type of disturbance that determines habitat degradation with negative consequences on rural population livehoods. We studied the factors that favor the fire-invasion cyc...

Background Global change produces pervasive negative impacts on biodiversity worldwide. Land use change and biological invasions are two of the major drivers of global change that often coexist; however, the effects of their interaction on natural habitats have been little investigated. In particular, we aimed to analyse whether the invasion of an...

Data used for the analyzes Within metadata tabs, every variable is explained.

A large area previously dominated by native ecosystems in South America is now covered by monocultures of non-native tree species, mainly of the genus Pinus. Currently, pine plantations and the invasions that have been generated from these are causing a homogenization process at the landscape, stand, and even micro-site scales. The continuous and e...

El cambio en el uso de la tierra y las invasiones biológicas son componentes significativos del cambio global mediado por el hombre. El objetivo de nuestro trabajo fue comparar la abundancia y tipo de mantillo (i.e. sumatoria de hojarasca, ramas finas, flores, frutos y materia orgánica particulada) en sitios modificados por la introducción e invasi...

La conversión de grandes áreas naturales en plantaciones de coníferas introducidas con fines forestales es un cambio reciente en el uso de la tierra en el noroeste patagónico, y sus diversos efectos incluyen desde pérdidas de biodiversidad, hasta efectos económicos sobre el eco-turismo o a partir del incremento del riesgo de incendios de interfase...

En el noroeste patagónico el fuego es uno de los disturbios más importantes y que actúa a mayor escala, moldeando los paisajes actuales y alterando potencialmente la susceptibilidad de las comunidades al fuego. En un escenario de cambio climático global, donde se prevé aumento de temperatura y disminución de precipitaciones, es importante generar c...

El fuego incrementa la expresión de ciertos caracteres adaptativos en la descendencia post-fuego. La serotinia (banco de semillas aéreo persistente) es considerado un carácter adaptativo clave frente a incendios. El objetivo de este estudio es evaluar si la invasión de pinos serótinos reclutados post-fuego presenta un mayor grado de serotinia y pro...

Fuegos recurrentes seleccionan características de persistencia de las especies que pueden considerarse adaptativas. Este trabajo analiza si Pinus radiata presenta tales características de adaptación rápida al fuego. Se analizó el efecto del fuego, altas temperaturas y sustrato post-fuego, sobre la germinación y el crecimiento temprano de plántulas...

El humo, derivado de la combustión de plantas puede estimular la germinación de ciertas especies asociadas a ambientes propensos al fuego. Nicotiana linearis es una herbácea fugitiva muy abundante en el postfuego temprano de los pastizales del noroeste patagónico. El objetivo fue estudiar el efecto del humo líquido en la germinación de semillas de...

Contrasting evidence in the degree of post-fire conifer invasion reported for different regions of the Southern Hemisphere (SH) raises questions about the role of fire as a presumed driver of invasion. We studied the influence of fire on invasion responses (assessing ‘serotiny’ and ‘time’ as key factors to determine invasion) based on a review of c...

Conifers, which are widely planted as fast growing tree crops, are invading forested and treeless environments across the globe, causing important changes in biodiversity. However, how small-scale impacts on plant diversity differ according to pine size and habitat context remains unclear. We assessed the effects of different stages of pine invasio...

"Del trabajo en El aula a la Feria de ciencias. Manual de Supervivencia les habla a aquellos docentes con ganas de embarcarse en el maravilloso desafío de enseñar a investigar a los chicos. En un estilo claro y amigable, a partir de ejemplos bien desarrollados y de la escuela real, los autores recorren en detalle las distintas etapas del proceso de...

El reclutamiento a través de la germinación y la capacidad rebrotante a partir de tejidos viables son los mecanismos a través de los cuales las especies vegetales sobreviven a diferentes tipos y regímenes de disturbios. Un gran porcentaje de las especies leñosas y trepadoras presentes en esta flora rebrotan y mantienen un bajo reclutamiento durante...

Varios autores sugieren que si los saberes ecológicos tradicionales de niños de escuelas rurales son incluidos en el currículo, se generan respuestas significativas en los alumnos, al ser herramientas didácticas de integración en términos cognitivos y culturales. A través de la articulación de una propuesta pedagógica por el método de indagación y...

Livestock can affect the soil seed bank through various mechanisms associated with changes in vegetation. We sampled vegetation and seed banks of Patagonian grasslands, in areas with different historical use by grazing (exclosure, moderate use and high use) to evaluate to what extent changes in vegetation are reflected in the seed bank. We also eva...

The cosmopolitan herb Rumex acetosella forms persistent soil seed banks and increases in cover after fire. We investigated how the interaction between seed age and fire affects seedling growth by exposing different-aged seeds to heat, smoke, charcoal, and ash treatments. We measured growth of germinated seedlings that were transplanted and allowed...

In Mediterranean ecosystems, fire influences plant population dynamics and changes plant community structure by affecting germination and establishment of seeder shrubs. Fabiana imbricata is a long-lived seeder shrub with a broad distribution in South America. In Northwestern Patagonia grasslands there are many records of F. imbricata recruitment a...

Rumex acetosella es una hierba exótica perenne que invade los claros (i.e., área entre los pastos perennes dominantes) de los pastizales del NO de la Patagonia. El objetivo de este trabajo fue estimar su grado de invasión y relacionar las variaciones de su cobertura con las características de la vegetación de los claros en comunidades dominadas por...

Rumex acetosella is an exotic perennial herb that invades grassland gaps (i.e., area between tussock grasses) at NW Patagonia. The aim of this study was to estimate the degree of invasion of R. acetosella and to relate cover fluctuations to gap vegetation characteristics in communities dominated by Pappostipa speciosa (ex Stipa speciosa) and commun...

Fire is a non-selective disturbance that impacts equally plant species that could be selected differentially by livestock. Post-fire recruitment dynamics is an important ecological process that has been barely studied in Patagonian grass species. This work analyzes the effect of fire on seed germination, seedling growth, and survival of Pappostipa...

Rumex acetosella is an exotic perennial herb that invades grassland gaps (i.e., area between tussock grasses) at NW Patagonia. The aim of this study was to estimate the degree of invasion of R. acetosella and to relate cover fl uctuations to gap vegetation characteristics in communities dominated by Pappostipa speciosa (ex Stipa speciosa) and commu...

Fire affects grassland composition by selectively influencing recruitment. Some exotic species can increase their abundance as a consequence of fire-stimulated seed germination, but response may depend on seed age. Rumex acetosella L. (Polygonaceae, sheep's sorrel) is a cosmopolitan herb that has invaded NW Patagonia's grasslands. This species form...

The emergent behaviors of nature are not only the sum of interactions among ecosystem parts but also depend on the organization of these interactions. Fire, climate and vegetation patterns produce non-linear fire propagation across the landscape. Environmental heterogeneity, like outcrop presence and hare density, increases landscape patchiness and...

Grasslands, dominated by herbaceous and woody vegetation, are ecosystems whose structure is determined by fire, grazing, and drought. Although these structuring factors determine the natural dynamics of grasslands, their plant biodiversity can be affected when these disturbances occur in an extreme or unbalanced way. The Argentinean northwestern Pa...

Question: (1) Which factors regulate post-fire recruitment and spread of the shrub Senecio bracteolatus in Patagonian grasslands? (2) What is the role of the grass Stipa speciosa on S. bracteolatus establishment in the post-fire succession? Location: Northwest Patagonia, Argentina. Methods: We studied the effect of fire on S. bracteolatus recruitme...

Time regimes in fire data recorded from 1992 to 2007 in a fire vulnerable area of Patagonia (Argentina) were revealed by using the Allan Factor statistics. The obtained results show the presence of seasonal periodicities, superimposed to three time-scaling regimes, which characterize the point process of the fire sequence as a fractal time process...

Desde hace años INTA - Bariloche trabaja en la evaluación de la capacidad forrajera a nivel predial, como base para el manejo ganadero de los establecimientos rurales. Utilizando imágenes satelitales y herramientas de teledetección, se desarrollo una metodología adaptada a ambientes áridos y semiaridos de la Patagonia. La misma se basa en la interp...

Focos de arbustización post-incendio de Fabiana imbricataen el noroeste de la Patagonia

INTRODUCCIÓN Los pastizales del noroeste de la Patagonia están expuestos a incendios frecuentes que, junto con el pastoreo, influyen en su estructura y dinámica. Las especies que componen estas comunidades responden de dos maneras características al fuego, rebrotando o, si las semillas acumuladas en el banco escapan al calor, reclutando nuevos indi...