The production and consumption of blueberry have increased in Mexico owing to its health benefits. Symbiotic relationships have been shown to be crucial in blueberry plants. In particular, phytohormone production by Pseudomonas fluorescens is an important mechanism of plant growth promotion. However, there are only a few reports on the effects of plant growth-promoting bacteria...
The healthy function of the gastrointestinal system is influenced by changes in the microbiota and the adaptability of the host to different habitat conditions and food availability. We isolated and identified 64 bacterial morphospecies from rectal swabs from five captive black howler monkeys (CM) and 15 wild individuals (WM) from groups living in fragments with different...
Wild edible plant species can be a good source of biologically active compounds. Therefore, the aims of this research were to evaluate the antioxidant activity and quantify the phenolic compounds present in ethanolic (70% v/v) and aqueous extracts of Tinantia erecta, and to evaluate their antifungal activity against phytopathogenic fungi. The total phenol and flavonoid content...
Aflatoxins are secondary metabolites toxic to human and animal health produced by Aspergillus flavus, and which contaminate food throughout the production chain. Knowing and characterizing the fungal population present in food helps us to estimate risk and design measures to mitigate fungal contamination. Thus, the objective of this work was characterizing the toxigenic potential...
Salinity is one of the major problems of modern agriculture, affecting physiological, growth and plant production. Basil (Ocimum basilicum) is a plant widely used in cooking, and in the pharmaceutical and cosmetics industries. Salicylic acid can be a strategy to mitigate the harmful effects of saline stress on basil plant. The present study aimed to evaluate plants with, gas...
The implementation of plants as a mechanism of treatment for different diseases is not something new at present, however, in recent years treatments based on these organic compounds known as bioactive or secondary metabolites have been promoted. In Colombia, research on the properties of plants is still few, but the present work contributes to the knowledge of plants such as...
Coral reefs inside Cartagena Bay have disappeared, largely due to the constant discharge of contaminated, sediment-rich freshwater from the Dique Channel. Recently, which might be the last healthy coral reef in the bay was found between Bocachica and Barú. Despite the unfavorable conditions for coral development, this reef exhibits an average coral cover of around 45 %. To study...
Zooplankton is one of the most important trophic components for the functioning of aquatic ecosystems, these organisms are the food base of fish and contribute to the cycling of nutrients. The challenge of this study was to find temporal variations of taxonomic composition, structure, and diversity of zooplankton and their relationship with environmental variables in the Ciénaga...
Piaractus orinoquensis is a native species from the Colombian Orinoquia and several studies have contributed to the standardization of protocols for seminal cryopreservation of this species. The main goal of this study was to evaluate the sperm motility, duration of sperm motility (DM), pH, sperm membrane integrity (SMI) and fertility of semen cryopreserved for seven years and...
Phytoplankton constitutes one of the most important components of lentic freshwater ecosystems, due it represents the basal resource for the growth and survival of the other organisms associated with these ecosystems. In addition, it provides relevant information for the diagnosis of the state of conservation of a waterbody, due to its sensitivity to a wide range of stressors...
The structure and histochemistry of the floral nectary of Bauhinia monandra Kurz (Fabaceae) were investigated. Besides possessing medicinal properties, this tree is also used in the recovery of degraded areas and urban arborization. Nectaries samples were obtained from newly bloomed flowers. The nectary was located on the tubular hypanthium. This tube was partially coated by a...
This study evaluated the sensitivity of male and female of guppies (Poecilia reticulata) to ammonia. LC50-96h for males, females and combined sexes of P. reticulata was 37.33, 48.34, and 42.45 mg/L of total ammonia or 1.03, 1.34, and 1.17 mg/L of un-ionized ammonia. The mortality at the concentration of 40 mg/L of total ammonia differed between the sexes with higher mortality in...
Wild fauna is of crucial importance in the social, economic and cultural construction of peasant communities, although its use can generate threats to the stability of the most exploited wild populations. This article determined from an ethnozoological point of view the uses received by wildlife in a rural town of Plato Magdalena. 70 structured interviews were carried out, using...
We analyzed microhabitat use for different age classes between climatic seasons and compared the diversity of prey consumed by adult males and females of Craugastor berkenbuschii in a tropical stream in southeastern Mexico. The data was collected in ten transects of 100 x 15 m, separated from each other by 25 m of the distance between them. Day and night sampling was carried out...
Water limitation is one of the main factors that influence the germination process, affecting crop establishment. Thus, alternatives capable of lessening such effects become of great relevance. The aim of this study was to evaluate the effect of ascorbic acid dosage on This study aimed of marandu grass seeds submitted to different water conditions. After establishing the...
Knowing the diversity and uses of corn is essential for food security. The characteristics of the seeds are important because they have particular characteristics that producers look for in their consumption or storage. In ten maize materials (seven natives and three free pollination varieties) information was obtained on the morphometric characteristics in seeds (length, width...
Plants respond to biotic and abiotic changes through their phenotypic plasticity. These variations can be expressed in traits related to leaf morphology, plant growth, and defoliation. We evaluated the influence of plant age and leaf age on leaf traits and its relation with defoliation in three forage plant species, Tithonia diversifolia, Morus alba, and Moringa oleifera...
The biofixation capacity of carbon dioxide by the Chlorella vulgaris and Scenedesmus obliquus species cultivated in photobioreactors was evaluated in a 12:12 h photoperiod. A completely randomized experimental design was used, whose sources of variation were: microalgal species and CO2 dosage (0.36, 11.44 and 22.62 g.d-1). The photobioreactors were plastic units with 3.8 L of...
Atractus potschi is a small Brazilian endemic snake. Its distribution is restricted to Brazil's Northeastern Atlantic Rain Forest and Caatinga biomes, in the States of Alagoas, Bahia, and Sergipe. Herein, we expanded its distribution in hinterlands by 270 km from the nearest previous record. This is also a new occurrence on the left bank of the São Francisco River.Keywords...
Meiotic behavior is of great importance for the development of genetic improvement programs, especially in species such as vanilla (Vanilla planifolia Jacks.), which are severely affected by various biotic and abiotic factors derived from their narrow genetic base. Therefore, the present work was proposed with the objective of evaluating the meiotic behavior of the commercial...
Cranial ontogenetic variations offer information on growth and trophic ecology in Crocodilia. Therefore, we analyze the ontogenetic variations of the skull, examining the shape and some bones in C. c. fuscus. We found an allometric effect and shape changes, varying from a longirostrine skull in hatchlings to a brevirostrine one in subadults and adults. A thickening in the base of...
The foundation of the Universidad Nacional de los Estados Unidos de Colombia in 1868 occurred almost a decade after the publication of Darwin's Origin of Species (1859); in the Escuela de Ciencias Naturales, courses were given that included themes of plant geography, geology and paleontology. ¿Would these courses follow the paradigm of natural history inherited from the botanical...
The oak forests in Colombia are dominated by the species Quercus humboldtii Bonpl. which is in the vulnerable category due to deforestation to generate crops, livestock areas and plantations of exotic species, causing the formation of edges due to the deterioration of the ecosystem. These forests establish symbiotic associations with species of ectomycorrhizal fungi, allowing the...
The Characiform fish species from the Tapyta Reserve and surrounding area, Caazapa, Paraguay, were inventoried during a year with electrofishing, netting, and trapping. A total of 20 species were registered, being Characidae the richest family. We also report three species as new records to the Paraguayan ichthyofauna and discuss the update of the inventory of fishes from...
The Cardenal (Paracheirodon axelrodi) is the ornamental fish species most commercialized in Inírida region of Colombia. Structure of size and weights, reproductive periods and maturity mean length estimations were obtained from specimens collected from the local fishing activity. Records of precipitation and flow rate of the Inírida river (for the period 1972 - 2016), were used...