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In this paper, we aim to honor Dr. Gabriela Castaño-Meneses for her remarkable scientific career, which has served as an enduring wellspring of inspiration for the members of the Laboratory of Arthropod Ecology in Extreme Environments. Throughout her professional journey, Dr. Castaño-Meneses has delved into the exploration of arthropod ecology and taxonomy, distinguishing herself particularly in the study of springtails, mites, and ants. Her research has traversed a broad spectrum of habitats, ranging from soil ecosystems to tree canopies, encompassing cave-dwelling and aquatic environments. Her contributions extend nationally and internationally, enriching our comprehension of ecological processes which can promote efforts in biodiversity conservation amidst the challenges posed by climate change and habitat loss. Beyond her scholarly achievements, Dr. Castaño-Meneses stands out as an emblematic reference in our lives, transcending her profound humanity throughout our tenure in her laboratory. [ABSTRACT FROM AUTHOR]

The studies carried out in extreme environments are of vital importance to know the variability of plankton in low temperature conditions, during the Southern summer, during the XVIII Ecuadorian Antarctic Expedition, between January and February 2014, the study area was located in the Guayaquil Cove and Chile Bay (Greenwich Island), plankton samples were collected at surface and vertical level using simple cylindro-conical-conical nets of 335µ and 50µ respectively, in order to determine the distribution of phytoplankton and zooplankton. Ten sampling stations were carried out in Guayaquil Inlet and 8 stations in Chile Bay in both strata. Nineteen phytoplankton species were identified at surface level and Thalassiosira sp. 60.3%, Cyclotella sp. 12.4% and Corethron criophylum with 12.7% were observed as dominant and 9 species in the water column, being dominant Thalassiosira sp. 52%, Cyclotella sp. 25% and C. criophylum with 11%, observing a 68.12% of dissimilarity between both zones, registering as dissimilar species Thalassiosira sp, Cyclotella sp., Limnophora abreviata, Synedra ocus and Diploneis coffeif.ormis. In Chile Bay, 19 species were recorded at surface level, with two dominant species, Cyclotella sp. 36% and C. criophylum with 28%, while 10 species were recorded in the water column, with Cyclotella sp. 45% and C. criophylum 25%. Zooplankton was represented in Guayaquil Cove by 11 groups, with copepods and amphipods as dominant, in the vertical there were 7 groups represented mostly by copepods, in Chile Bay in both strata an average of 6 groups were recorded and copepods were the dominant ones. Within the Ecological indexes in the phytoplankton recorded a Shannon value of 1.3 bits/cel at the surface level and 1.2 bits/cel in the vertical, Simpson of 0.4 bits/cel in both strata and Pielou recorded an average of 0.75 bits/cel, in Guayaquil Inlet, in Chile Bay at surface level a H value of 1.5 bits/cel and 1.2 bits/cel in the vertical was observed, Simpson with an average of 0.35 bits/cel in both strata and Pielou with 0.70 bits/cel at surface level and 0.9 bits/cel in the vertical. [ABSTRACT FROM AUTHOR]

Copyright of Revista Ciencia y Poder Aéreo is the property of Escuela de Postgrados de la Fuerza Aerea Colombiana and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Lilloa is the property of Fundacion Miguel Lillo and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The search for life on other planets is one of the most important scientific challenges of this century, centered mainly on Mars. The Atacama Desert is one of the places on the planet with an environment similar to the red planet, with a hyper-arid core that constitutes an extreme environment and scarce life, due to environmental factors. At the moment it has not been possible to confirm the existence of life in this planet, but it is planned to take the life to this planet by means of potato crop. Also has been research the application of microorganisms for the recovery of desert soils, with high salinity or low fertility, through the interaction of microorganisms and plants. The present review describes the similarities between the La Joya desert in Atacama and Mars, showing its importance for the search for life on that planet. Show the recent advances in the investigation of potato crops for its development on Mars or in similar conditions, in addition to the importance of the application of microorganisms that facilitate the growth and adaptability of this crop to inhospitable conditions. [ABSTRACT FROM AUTHOR]

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Because of extreme rainfall events caused by climate change and of accelerated alteration of basins by population growth, it is important to forecast streamflow generated by precipitation events. The objective of this study was to predict hourly flows in the Huaynamota River basin using the Discrete Kalman Filter (DKF), together with the autoregressive exogenous input model (ARX). Initially, the Kalman filter parameters are defined then recalculated for defined periods; that is, the model parameter values are constantly updated. Flows were forecasted six steps ahead (L=1, 2, 3, 4, 5 and 6 hours). The basin studied is part of the Huynamota River, delimited by the Chapalangana hydrometric station, upstream from the Aguamilpa reservoir, Nayarit, Mexico. The Huaynamota River is a tributary of the Santiago River. Hourly data series were used for precipitation and flow from August to September 2017. The DKF-ARX forecasting model showed Nash-Sutcliffe efficiency indexes between 0.99 and 0.85, with L=1 and L=6, respectively. It is concluded that it is feasible to obtain a good forecast of hourly streamflow with the discrete Kalman filter. [ABSTRACT FROM AUTHOR]

Variations in needle anatomy can be an adaptative or acclimatization response to the edaphoclimatic stress among population, particularly in those facing extreme environments. Pinus caribaea var. caribaea and P. tropicalis are distributed in western Cuba, mainly in Pinar del Río province, forming pure stands or in sympatric populations. The aim of this study is to compare distinctive anatomy characteristics of the needle of both taxa in the localities where they are sympatrically associated. Cross sections of the needles were done and 14 anatomical variables are assessed. The statistical analyses clearly differentiate both taxa, concluding that each have their own variations to adapt to the same environment. The principal component analysis showed that the populations of each taxon segregate according to the edatope where they grow. For P. caribaea var. caribaea the anatomical variables that most contributed the variation and classification were: the number of stomata, thickness and number of band of cells of the hypodermis; in P. tropicalis it was the thickness of the cuticle and the chlorophyllic parenchyma, and for each taxon the type of resin canal was unequivocally endonal and marginal. [ABSTRACT FROM AUTHOR]

This article presents the conceptualization, characteristics, national and international research on learning environments. For this purpose, a bibliographic review of approximately fifty sources was carried out. Based on these, the conceptualization and characteristics that learning environments should have in order to be effective in teaching-learning processes were elaborated according to the authors reviewed. Likewise, an international overview structured by continents was developed on research in which diverse elements of study were identified; and a national overview divided by regions, in which definitions, research and work carried out are evidenced, all following a chronological order. Finally, the paper focuses on how Colombia can improve learning environments through the role of teachers and their training. [ABSTRACT FROM AUTHOR]

Copyright of Revista de Ciencias is the property of Universidad del Valle and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The objectives of the present study were to evaluate sideoats grama [Bouteloua curtipendula (Michx.) Torr.] populations, to set an ex situ plot, and to asses morphological diversity. From 2000 to 2003, 577 sideoats grama populations were collected in 13 Mexican States. In 177 established ecotypes, the following plant morphologic attributes were assessed: vigour, regrowth, forage texture, dry matter production potential, phenology, seed production potential, leaf density, tiller type and leaf:stem ratio. Variables were analysed through principal component analysis (PCA) using the PRINCOMP procedure. The first three components explained 62.9 % of the total observed variation. Principal component one (PC1) included characteristics related with growth and explained 36.4 % of variation; vigour, leaf density, and leaf:stem ratio were the most important variables. The PC2 included characteristics related with propagation and explained 15.1 % of variation; seed potential and tiller type were important variables. The PC3 explained 11.4 % of variation; forage texture and phenology were the most important variables. The PC1 and PC2 revealed the existence of six different groups. This dispersion reflects a wide morphological and genetic variation in this species; it was observed that this dispersion is not systematic, since it is possible to establish groups based on physiographic adaptation of ecotypes instead of locality or place of origin. It can be concluded that this variation is important while selecting the best forage characteristics in order to set up a genetic improvement program. [ABSTRACT FROM AUTHOR]