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  1. Article ; Online: Draft genome sequence data of Antarctic

    Peng, Teoh Chui / Lavin, Paris / Pedraza, Rómulo Oses / Fierro-Vásquez, Natalia / Purcarea, Cristina / Yong, Sheau Ting / Wong, Clemente M V L

    Data in brief

    2024  Volume 53, Page(s) 110143

    Abstract: Here, we report the draft genome sequence and assembly of ... ...

    Abstract Here, we report the draft genome sequence and assembly of the
    Language English
    Publishing date 2024-02-09
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2786545-9
    ISSN 2352-3409 ; 2352-3409
    ISSN (online) 2352-3409
    ISSN 2352-3409
    DOI 10.1016/j.dib.2024.110143
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Macrobenthic community establishment on artificial reefs with Macrocystis pyrifera over barren-ground and soft-bottom habitats

    Leonardo Campos / Marco Ortiz / Fabián A. Rodríguez-Zaragoza / Rómulo Oses

    Global Ecology and Conservation, Vol 23, Iss , Pp e01184- (2020)

    2020  

    Abstract: Kelps provide important habitat for a range of species, however they are suffering increasing levels of degradation. This has prompted efforts to restore these ecosystems, however, the trajectory of community establishment on artificial reefs has not ... ...

    Abstract Kelps provide important habitat for a range of species, however they are suffering increasing levels of degradation. This has prompted efforts to restore these ecosystems, however, the trajectory of community establishment on artificial reefs has not being widely described. We examined the composition of the species and functional groups of invertebrates and fish in relation to the artificial reefs over soft-bottom and barren-ground habitats over a 10-month period. We evaluated the community structure based on species richness, biomass, species diversity, and dominance of species and functional groups. We assessed the trajectories of the ecological succession of artificial reefs planted with kelp on each bottom type and determined the changes in the dissimilarity of species and functional groups over time. We also analysed the relationship between the biogeny (of macroalgae) over time (months) and the changes in macrobenthic community structure. Successional development of reefs communities was similar across the two habitat types, macroalgae contributed most to the early stage, while invertebrates and fish were the groups that contributed the most during the middle and late successional stages. A positive relationship was found between the presence of artificial reefs with kelp seedlings and the biomass of specific species and functional groups. This study showed that new kelp habitats promote the construction of biogenic structures that increase the habitat complexity, promote biodiversity, and increase populations of commercially harvested species. In this sense, artificial reefs should be considered an important tool for restoring the function of degraded benthic ecosystems.
    Keywords Kelp ecosystems ; Restoration ecology ; Communities ; Ecology ; QH540-549.5
    Subject code 580
    Language English
    Publishing date 2020-09-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Impact of Climate and Slope Aspects on the Composition of Soil Bacterial Communities Involved in Pedogenetic Processes along the Chilean Coastal Cordillera

    Victoria Rodriguez / Lisa-Marie Moskwa / Rómulo Oses / Peter Kühn / Nicolás Riveras-Muñoz / Oscar Seguel / Thomas Scholten / Dirk Wagner

    Microorganisms, Vol 10, Iss 847, p

    2022  Volume 847

    Abstract: Soil bacteria play a fundamental role in pedogenesis. However, knowledge about both the impact of climate and slope aspects on microbial communities and the consequences of these items in pedogenesis is lacking. Therefore, soil-bacterial communities from ...

    Abstract Soil bacteria play a fundamental role in pedogenesis. However, knowledge about both the impact of climate and slope aspects on microbial communities and the consequences of these items in pedogenesis is lacking. Therefore, soil-bacterial communities from four sites and two different aspects along the climate gradient of the Chilean Coastal Cordillera were investigated. Using a combination of microbiological and physicochemical methods, soils that developed in arid, semi-arid, mediterranean, and humid climates were analyzed. Proteobacteria , Acidobacteria , Chloroflexi , Verrucomicrobia , and Planctomycetes were found to increase in abundance from arid to humid climates, while Actinobacteria and Gemmatimonadetes decreased along the transect. Bacterial-community structure varied with climate and aspect and was influenced by pH, bulk density, plant-available phosphorus, clay, and total organic-matter content. Higher bacterial specialization was found in arid and humid climates and on the south-facing slope and was likely promoted by stable microclimatic conditions. The presence of specialists was associated with ecosystem-functional traits, which shifted from pioneers that accumulated organic matter in arid climates to organic decomposers in humid climates. These findings provide new perspectives on how climate and slope aspects influence the composition and functional capabilities of bacteria, with most of these capabilities being involved in pedogenetic processes.
    Keywords bacterial-community structure ; bacterial diversity ; climate gradient ; slope aspect ; Chilean Coastal Cordillera ; soil formation ; Biology (General) ; QH301-705.5
    Subject code 550
    Language English
    Publishing date 2022-04-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: An Integrated Approach for the Environmental Characterization of a Coastal Area in the Southern Atacama Desert

    Estefanía Bonnail / Edgardo Cruces / Eva Rothäusler / Rómulo Oses / Ayón García / Christopher Ulloa / Nuria Navarro / Yesenia Rojas-Lillo / Álvaro Parra Valdivia / Ricardo Catalán Garrido / Manuel Abad

    Applied Sciences, Vol 13, Iss 6360, p

    2023  Volume 6360

    Abstract: Desert areas in northern Chile are highly valuable ecosystems. While human activities are impacting the area in different ways, there are few environmental studies available. The current study analysed the ecological health status (water, sediment, biota) ...

    Abstract Desert areas in northern Chile are highly valuable ecosystems. While human activities are impacting the area in different ways, there are few environmental studies available. The current study analysed the ecological health status (water, sediment, biota) of a northern coastal area in the Atacama Region, including a national park (with a protected marine area), a tourist and benthic management area, and an industrial area. Results from the physical–chemical characterization and physiological state of organisms of ecological importance (macroalgae and microalgae) were integrated to determine pollution and toxic responses. The results identified high and moderate pollution levels for Bi, Ca, As, Ag and Cd in sediments. The As concentration in sediments is the leading environmental problem, with average values above the threshold effect level, associated with fine sediments. The stations showed increasing contamination and stress from north to south (national park > tourist and benthic management area > industrial area), associated with the proximity to the discharge of mining waste from the Salado River. The national park registered the poorest health status as demonstrated by high Cu bioaccumulation and high photosynthetic stress in the macroalgae and the lowest biomass concentration of the microalgae in water. The tourist and benthic management area demonstrated high As concentrations in sediments and Cd bioaccumulation. The industrial area was the least contaminated area, exhibiting lower photosynthetic stress and bioaccumulation.
    Keywords desert ; marine pollution ; ecosystem health status ; algae monitoring ; Technology ; T ; Engineering (General). Civil engineering (General) ; TA1-2040 ; Biology (General) ; QH301-705.5 ; Physics ; QC1-999 ; Chemistry ; QD1-999
    Subject code 333
    Language English
    Publishing date 2023-05-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Deep weathering in the semi-arid Coastal Cordillera, Chile

    Laura V. Krone / Ferdinand J. Hampl / Christopher Schwerdhelm / Casey Bryce / Lars Ganzert / Axel Kitte / Kirstin Übernickel / Armin Dielforder / Santiago Aldaz / Rómulo Oses-Pedraza / Jeffrey Paulo H. Perez / Pablo Sanchez-Alfaro / Dirk Wagner / Ute Weckmann / Friedhelm von Blanckenburg

    Scientific Reports, Vol 11, Iss 1, Pp 1-

    2021  Volume 15

    Abstract: Abstract The weathering front is the boundary beneath Earth’s surface where pristine rock is converted into weathered rock. It is the base of the “critical zone”, in which the lithosphere, biosphere, and atmosphere interact. Typically, this front is ... ...

    Abstract Abstract The weathering front is the boundary beneath Earth’s surface where pristine rock is converted into weathered rock. It is the base of the “critical zone”, in which the lithosphere, biosphere, and atmosphere interact. Typically, this front is located no more than 20 m deep in granitoid rock in humid climate zones. Its depth and the degree of rock weathering are commonly linked to oxygen transport and fluid flow. By drilling into fractured igneous rock in the semi-arid climate zone of the Coastal Cordillera in Chile we found multiple weathering fronts of which the deepest is 76 m beneath the surface. Rock is weathered to varying degrees, contains core stones, and strongly altered zones featuring intensive iron oxidation and high porosity. Geophysical borehole measurements and chemical weathering indicators reveal more intense weathering where fracturing is extensive, and porosity is higher than in bedrock. Only the top 10 m feature a continuous weathering gradient towards the surface. We suggest that tectonic preconditioning by fracturing provided transport pathways for oxygen to greater depths, inducing porosity by oxidation. Porosity was preserved throughout the weathering process, as secondary minerals were barely formed due to the low fluid flow.
    Keywords Medicine ; R ; Science ; Q
    Subject code 550
    Language English
    Publishing date 2021-06-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article: Nurse effect and soil microorganisms are key to improve the establishment of native plants in a semiarid community

    Molina-Montenegro, Marco A / Cristian Atala / Cristian Torres-Díaz / Gustavo Bolados / Pedro León-Lobos / Rómulo Oses

    Journal of arid environments. 2016 Mar., v. 126

    2016  

    Abstract: Facilitation by the nurse effect can occur through an amelioration of environmental stress. Plant-microorganism interaction, however, is another key facilitation mechanism of the nurse effect, but is by far the least documented. Here we tested if ... ...

    Abstract Facilitation by the nurse effect can occur through an amelioration of environmental stress. Plant-microorganism interaction, however, is another key facilitation mechanism of the nurse effect, but is by far the least documented. Here we tested if microclimatic mitigation and soil microorganisms isolated from the root-zone of the nurse shrub Porlieria chilensis can increase the establishment of other native plants in a semiarid community. We conducted field and greenhouse experiments to evaluate the direct and indirect effects of the presence of P. chilensis on the survival and growth of three native plants. In the field experiment, we compared the survival and growth of transplanted individuals beneath nurses and outside of them in pots filled with soil from both microsites (beneath and outside nurses). Finally, in the greenhouse experiment we grew native plants in soil taken from both microsites (below and outside nurses) and with and without soil microorganisms (sterilization process). We found a clear and significant nurse effect of P. chilensis on the tested species through of amelioration of climatic (air temperature, soil moisture, and solar radiation) and edaphic (nitrogen availability) conditions, increasing the performance of these native species. Moreover, performance and establishment were enhanced when soil was kept with microorganisms. Thus, nurse effect mediated by microclimatic amelioration, edaphic improvement and presence of soil microorganisms could be key mechanisms to increase the establishment of native plant species in semiarid communities of central Chile.
    Keywords air temperature ; dry environmental conditions ; field experimentation ; greenhouse experimentation ; indigenous species ; microclimate ; nitrogen ; nurses ; shrubs ; soil microorganisms ; soil water ; solar radiation ; Chile
    Language English
    Dates of publication 2016-03
    Size p. 54-61.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 428507-4
    ISSN 1095-922X ; 0140-1963
    ISSN (online) 1095-922X
    ISSN 0140-1963
    DOI 10.1016/j.jaridenv.2015.10.016
    Database NAL-Catalogue (AGRICOLA)

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  7. Article ; Online: Is physiological performance a good predictor for fitness? Insights from an invasive plant species.

    Marco A Molina-Montenegro / Cristian Salgado-Luarte / Rómulo Oses / Cristian Torres-Díaz

    PLoS ONE, Vol 8, Iss 10, p e

    2013  Volume 76432

    Abstract: Is physiological performance a suitable proxy of fitness in plants? Although, several studies have been conducted to measure some fitness-related traits and physiological performance, direct assessments are seldom found in the literature. Here, we ... ...

    Abstract Is physiological performance a suitable proxy of fitness in plants? Although, several studies have been conducted to measure some fitness-related traits and physiological performance, direct assessments are seldom found in the literature. Here, we assessed the physiology-fitness relationship using second-generation individuals of the invasive plant species Taraxacum officinale from 17 localities distributed in five continents. Specifically, we tested if i) the maximum quantum yield is a good predictor for seed-output ii) whether this physiology-fitness relationship can be modified by environmental heterogeneity, and iii) if this relationship has an adaptive consequence for T. officinale individuals from different localities. Overall, we found a significant positive relationship between the maximum quantum yield and fitness for all localities evaluated, but this relationship decreased in T. officinale individuals from localities with greater environmental heterogeneity. Finally, we found that those individuals from localities where environmental conditions are highly seasonal performed better under heterogeneous environmental conditions. Contrarily, under homogeneous controlled conditions, those individuals from localities with low environmental seasonality performed much better. In conclusion, our results suggest that the maximum quantum yield seem to be good predictors for plant fitness. We suggest that rapid measurements, such as those obtained from the maximum quantum yield, could provide a straightforward proxy of individual's fitness in changing environments.
    Keywords Medicine ; R ; Science ; Q
    Subject code 580
    Language English
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article: Fungal endophytes associated with roots of nurse cushion species have positive effects on native and invasive beneficiary plants in an alpine ecosystem

    Molina-Montenegro, Marco A / Cristian Atala / Cristian Torres-Díaz / Cristina Armas / Martín A. Núñez / Rómulo Oses

    Geobotanisches Institut ETH, Stiftung Ruebel Perspectives in plant ecology, evolution and systematics. 2015 May 20, v. 17, no. 3

    2015  

    Abstract: Facilitation has been proposed to be a fundamental mechanism for plant coexistence, being particularly important in highly stressful environments such as alpine environments. In this type of environment, species called “cushion plants” can ameliorate the ...

    Abstract Facilitation has been proposed to be a fundamental mechanism for plant coexistence, being particularly important in highly stressful environments such as alpine environments. In this type of environment, species called “cushion plants” can ameliorate the stressful conditions, acting as nurses for other plants. Of the several mechanisms proposed in the positive-interactions framework, plant–microorganism interaction may be one of the most common, but least documented. Here we show that the presence of endophytes isolated from the roots of cushion plants Laretia acaulis can play a fundamental role in the establishment, performance and survival of both native and exotic plant seedlings that are known to be facilitated by the cushion species.To test this, we measured survival and growth of two native and one invasive species at 3200m in the Andes of Central Chile. Plants were grown inside artificial cushions filled with native soil, with or without sterilization, and with or without fungal endophytic inoculation to evaluate the role of fungal endophytes on survival and growth. In addition, we conducted a second experiment in a greenhouse with the invasive species to evaluate the effect of fungal endophytic infection/association on plant ecophysiological performance, dry biomass and seed output.Overall, our results showed a strong positive effect of fungal endophytes on the survival and growth of both native and invasive species. Moreover, maximum quantum efficiency (Fv/Fm), biomass accumulation and seed production were enhanced in the invasive species when soils were inoculated with endophytes. Thus, facilitation by root endophytic fungi on native and invasive alpine plants could determine survival and establishment in this harsh environment.Several studies have shown that direct facilitation by cushion plants in alpine environments improves the performance and fitness of both native and exotic plants. Our results suggest that there are indirect effects, mediated by microorganism associations that may also help to explain the successful establishment of native and invasive species in these environments. If indirect plant–plant facilitation through root fungal endophytes proves to be a widespread phenomenon in alpine ecosystems, it could be a key component in the structuring of plant communities in those stressful environments.
    Keywords alpine plants ; biomass production ; ecophysiology ; ecosystems ; endophytes ; fungi ; greenhouse experimentation ; indigenous species ; introduced plants ; invasive species ; plant communities ; roots ; seedlings ; soil ; Andes region ; Chile
    Language English
    Dates of publication 2015-0520
    Size p. 218-226.
    Publishing place Elsevier GmbH
    Document type Article
    ZDB-ID 1434765-9
    ISSN 1433-8319
    ISSN 1433-8319
    DOI 10.1016/j.ppees.2015.02.003
    Database NAL-Catalogue (AGRICOLA)

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  9. Article ; Online: Impact of mycorrhizae and irrigation in the survival of seedlings of Pinus radiata D. Don subject to drought Impacto de la inoculación con micorrizas y el riego en la sobrevivencia de plántulas de Pinus radiata D. Don sometidas a sequía

    CRISTIAN ATALA / EDGARDO MUÑOZ-CAPPONI / GUILLERMO PEREIRA / EDUARDO NAVARRETE / RÓMULO OSES / MARCO MOLINA-MONTENEGRO

    Gayana. Botanica, Vol 69, Iss 2, Pp 296-

    2012  Volume 304

    Abstract: In drought condition, plants increase survival chance by adjusting their functional traits and by biological associations. Mycorrhizae association and artificial watering have been shown to increase plant survival under drought, especially at early ... ...

    Abstract In drought condition, plants increase survival chance by adjusting their functional traits and by biological associations. Mycorrhizae association and artificial watering have been shown to increase plant survival under drought, especially at early developmental stages when plants are more susceptible. In Chile, Pinus radiata is the most important forest species. It is grown mainly in Central Chile, where precipitations are predicted to drop in 40% and change in frequency in the future due to climate change. Rhizopogon luteolus is an ectomycorrhizae usually associated with Pinus species and has been found to increase drought tolerance. We addressed the effect of R. luteolus inoculation on survival and functional traits of P. radiata seedlings exposed to two watering treatments. These treatments simulated control (50 ml) and 40% reduced precipitations (20 ml). We also evaluated the combined effect of watering quantity (20 and 50 ml) and frequency (every 5, 10 and 30 days) on the same variables. R. luteolus inoculation increased seedling survival, but reduced plant size. Watering quantity affected plant survival only at intermediate watering frequencies, but not at the high and low frequencies. The lowest frequency, normal for the summer of Central Chile, resulted in -80% seedling mortality. Most of the functional traits measured were not affected neither by watering frequency nor quantity, but they were affected by mycorrhization. Mycorrhizae inoculation, together with some sort of artificial watering could be a possible strategy to cope with prolonged drought events. En condiciones de sequía, las plantas aumentan la probabilidad de sobrevivir ajustando sus rasgos funcionales y por medio de asociaciones biológicas. Las asociaciones micorrícicas y el riego artificial aumentan la sobrevivencia en condiciones de sequía, especialmente en etapas tempranas del desarrollo, cuando las plantas son más sensibles. En Chile, Pinus radiata es la especie forestal más importante. Se planta principalmente en Chile central, donde se predice que las precipitaciones disminuirán en un 40% y cambiará su frecuencia en el futuro debido al cambio climático. Rhizopogon luteolus es una ectomicorriza usualmente asociada a especies de Pinus y se ha encontrado que aumenta la tolerancia a la sequía. Se analizó el efecto de la inoculación de R. luteolus en la sobrevivencia y rasgos funcionales de plántulas de P. radiata expuestas a dos tratamientos de riego. Estos tratamientos simulan precipitaciones control (50 ml) y reducidas a un 40% (20 ml). También se evaluó el efecto combinado de la cantidad (20 y 50 ml) y frecuencia (cada 5, 10 y 30 días) de riego en las mismas variables. La inoculación con R. luteolus aumentó la sobrevivencia pero redujo el tamaño de las plántulas. La cantidad de riego afectó la sobrevivencia de las plantas sólo en la frecuencia intermedia de riego, pero no en las frecuencias alta y baja. La frecuencia más baja, normal para el verano de Chile central, resultó en -80% de mortalidad de plántulas. La mayoría de los rasgos funcionales no fueron afectados por la frecuencia o cantidad de riego, pero si por la micorrización. La inoculación con micorrizas, en conjunto con algún tipo de riego artificial, podría ser una posible estrategia para lidiar con eventos de sequía prolongada.
    Keywords Pinus radiata ; Rhizopogon luteolus ; cambio climático ; ectomicorrizas ; tolerancia a la sequía ; climate change ; ectomycorrhizae ; drought tolerance ; Botany ; QK1-989 ; Science ; Q ; DOAJ:Botany ; DOAJ:Biology ; DOAJ:Biology and Life Sciences
    Language English
    Publishing date 2012-01-01T00:00:00Z
    Publisher Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Article ; Online: Linking Climatic Variability with Spatial Performance in Two Varieties of Quinoa Distributed in a Semi-Arid Zone

    Sonia Montecinos / Pablo Salinas / Rómulo Oses / Leticia González-Silvestre / Marco A. Molina-Montenegro

    American Journal of Plant Sciences , Vol 03, Iss 12, Pp 1682-

    2012  Volume 1687

    Abstract: Different crop varieties can respond in different ways to the climatic variations at local scale. Thus, in order to maximize the yield for a determined crop, the response of different varieties submitted to local climatic conditions should be assessed. ... ...

    Abstract Different crop varieties can respond in different ways to the climatic variations at local scale. Thus, in order to maximize the yield for a determined crop, the response of different varieties submitted to local climatic conditions should be assessed. The main goal of this study was to evaluate the ecophysiological responses of two varieties of Quinoa (PRP and BO78) submitted to different conditions of thermal amplitude. We performed two experiments in both greenhouse and in 3 sites on experimental-field where were evaluated survival, photochemical efficiency, plant growth and dry biomass in both varieties and compared them with the mean of the thermal conditions recorded during the last 16 years in the Coquimbo Region, Chile. Overall, individuals of BO78 showed higher performance in the sites with lower thermal amplitude than those of PRP. By contrast, in sites with higher thermal amplitude individuals of PRP showed better survival, physiological performance and biomass and therefore higher performance. Our results suggest that while BO78 showed an ecotypic strategy, the PRP showed a plastic strategy to maintain higher performance in sites with moderate and high climatic variability. We consider that under an increase in desertification, semi-arid areas would be available for stress tolerant crops like Quinoa, but the success for the food security in these regions may depend upon the variety used.
    Keywords Quinoa ; Thermal Amplitude ; Plasticity ; Ecophysiology ; Crop Yield ; Plant culture ; SB1-1110 ; Agriculture ; S ; DOAJ:Plant Sciences ; DOAJ:Agriculture and Food Sciences
    Subject code 580
    Language English
    Publishing date 2012-12-01T00:00:00Z
    Publisher Scientific Research Publishing
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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