Abstract The fast–slow plant economics spectrum predicts that because of evolutionary and biophysical constraints, different organs must be coordinated to converge in a unique ecological strategy within continuum shifts from fast slow resource acquisition conservation. Therefore, along gradient aridity, taxa with strategies will expected successful selection pressures for become stronger as the environment becomes drier. In extremely arid seasonal environments, however, may disadvantageous...

Abstract The aim of this work was to evaluate the utility A zolla filiculoides growing in a hydroponic system for phytoremediation continental water polluted with cadmium and copper during 7 days exposure. Cadmium chloride were added medium at concentrations 0.5–10 mg/ L 0.1–25 , respectively. levels measured each plant using flame atomic absorption spectrophotometry. analytical methodology used measure validated standard reference material ( SRM ) – 1570 (spinach) National Institute...

Plant reproductive failure is a critical concern for conserving rare and endangered species that typically have low-density sparse populations. One important factor contributing to the spatial arrangement of plants within population, which can lead isolation negatively affect seed production, particularly in obligate outcrossers. Additionally, plant size compound this effect, influencing production via multiple processes. Here, we investigate how distribution influence success

Harsh environmental conditions in arid ecosystems limit seedling recruitment to microhabitats under nurse structures, such as shrubs or rocks. These however, do not necessarily afford the same benefits plants because rocks provide only physical effects, whereas can both and biological effects. Nevertheless, if plant is a conspecific, it provides may be outweighed by higher mortality due negative density-dependent processes; consequently, density-dependence expected from acting nurses their...

Seed predation and seed dispersal are important ecological processes with antagonistic effects on plant recruitment. In the southern edge of Atacama Desert in Chile, Myrcianthes coquimbensis is an endangered, large‐seeded, vertebrate‐dispersed shrub that present‐day has no known dispersers. Native rodents hoard eat seeds M. but leave viable fragments at hoarding sites; soil interspaces within rock outcrops where seedlings recruit. Here we examined whether act as effective dispersers by...

In arid environments, where light and water supply are patchy in space time, differences how seedlings tolerate drought shade conditions will determine the ability of a species to establish. Understanding seedling responses interactive effects is critical predict future impact increasing frequencies on plant communities across many ecosystems world. this study, we used an experimental field approach assess different (15%, 75%, 95%) (natural rainfall (NR), NR +50 mm, +100 mm) levels affect...

Background: Myrcianthes coquimbensis is an endangered shrub endemic to Chile. No published account known about its biology, ecology or threats continued existence. Aims: To document the current state of knowledge M. regarding geographic distribution, and population reproductive parameters, evaluate in distribution range. Methods: Historical records recent survey data 110 localities were used characterise distribution. Plots established seven determine proportion flowering individuals,...

Myrceugenia exsucca (DC.)O.Berg (Myrtaceae) and Luma chequen (Molina) A. Gray are two predominants species from swamp forests of Chile.These present differential microhabitat distribution across soil moisture north-south precipitation gradients, with only L. being commonly found in lower sites.It is hypothesized that has greater plasticity than M. the attributes involved photoprotection under drought conditions.To test this hypothesis, both were exposed to short term treatment.A group...

PREMISE OF THE STUDY: Drought is the most limiting factor for plant growth and recruitment in arid environments. For widespread species, however, responses to drought can vary across populations because environmental conditions along range of species. Here, we assessed whether plants Encelia canescens from different an aridity gradient Atacama Desert respond differently water‐deficit conditions. METHODS: We conducted a common‐garden experiment using grown seeds three distributed test...

Seed dormancy is one of the most important adaptive mechanisms in plants, optimizing germination, seedling emergence, and establishment to ensure these processes occur when environmental conditions are favorable for plant survival growth. Endemic rocky environments southern Atacama Desert, Austral papaya (Carica chilensis) species with southernmost distribution within Caricaceae, thriving extreme conditions. This threatened exhibits low natural regeneration, primarily attributed yet no...

Seed loss to predators is a common phenomenon across plant communities and an important determinant of recruitment. Although seed commonly destroy the entire seed, partial consumption has been reported for many species; however, degree which mass affects germination dynamics survival new individuals poorly documented. We simulated damage in natural conditions examine how different levels cotyledonary reserve removal affect seedling performance Myrcianthes coquimbensis (Myrtaceae), threatened...

This study evaluated the capacity of Azolla filiculoides to enhance heavy metal accumulation through addition different concentrations cadmium (Cd) and copper (Cu), as ethylenediaminetetraacetic acid (EDTA) complexes, under hydroponic conditions. The physiological effect was determined by Photosynthetic efficiency (Fv/Fm) an indicator plant stress, content measured with flame atomic absorption spectroscopy in whole plants. results obtained rhizofiltration systems did not show increase when...

Desert shrubs are keystone species for plant diversity and ecosystem function. Atriplex clivicola deserticola (Amaranthaceae) native from the Atacama that show contrasting altitudinal distribution (A. clivicola: 0–700 m.a.s.l.; A. deserticola: 1500–3000 m.a.s.l.). Both possess a C4 photosynthetic pathway Kranz anatomy, traits adaptive to high temperatures. Historical records projections near future trends in increasing air temperature frequency of heat wave events these species’ habitats....

Myrceugenia exsucca (DC.)O. Berg and Luma chequen (Molina) A. Gray are two predominant species of Myrtaceae from the swamp forest which strongly threatened by destruction their habitat.Conservation programs include creation new protected areas often have different environmental conditions respect natural habitat.The drought tolerance capability to restore physiological performance after stress relief characteristic great importance for successful conservation on these kinds...

Abstract Accurately mapping and assessing plant functional composition across space time is pivotal for understanding environmental change impacts on the biodiversity functioning of forests. Here, we test capabilities a combination in-situ remote sensing approaches to deliver accurate estimates temperate forest ecosystems considering leaf stem morphological, nutrient, hydraulic, photosynthetic traits. We identify hydrological stress, soil, topography as key drivers Further, stress soil are...

Abstract The structuring of plant assemblages along environmental gradients is typically explained by shifts from competition (limiting similarity) to filtering as the environment becomes more stressful. However, facilitation, weaker-competitor exclusion, heterogeneity, and colonization-competition tradeoff can also structure gradients. These assembly processes act on different traits organs, their prevalence varies with respect spatial scale. Using patterns functional diversity, coupled...

La Reserva de Biosfera Cabo Hornos (RBCH) alberga una biodiversidad y tipos ecosistemas únicos a nivel mundial. Éstos han sido mucho menos estudiados que sus homólogos, los subpolares del hemisferio norte. El objetivo este trabajo es presentar por primera vez detallada descripción marcados gradientes climáticos la RBCH examinar cómo éstos se interrelacionan con distribución formaciones vegetacionales. Primero, generó caracterización espacial terrestres definidos especies vegetales dominantes...

Abstract Seed dormancy is one of the most important adaptive mechanisms in plants, which optimizes germination, seedling emergence, and establishment so that these processes occur when environmental conditions are favorable for plant survival growth. Endemic to rocky environments southern Atacama Desert, Austral papaya ( Carica chilensis ) species with southernmost distribution Caricaceae growing extreme conditions. This threatened has minimal natural regeneration, attributed low germination...

PREMISE OF THE STUDY Plant reproductive failure is a critical concern for conserving rare and endangered species that typically have low-density sparse populations. One important factor contributing to the spatial arrangement of plants within population, which can lead isolation negatively affect seed output, particularly in obligate outcrossers. Additionally, this effect be compounded by plant size. Here, we investigate how plants’ distribution size influence success Carica chilensis,...