El reto para lograr la producción de biogás a gran escala sigue residiendo en el proceso de fermentación de este a bajas temperaturas. Nuestro objetivo fue profundizar en la ruta metabólica que subyace a la formación de biogás a bajas temperaturas, centrándonos en las comunidades bacterianas y arqueas dominantes. Empleando un sistema discontinuo con inóculo de lodos activados a...
Pimelodella is one of the most diverse genera of the family Heptapteridae with approximately 83 valid species. However, the taxonomy of this genus is problematic since it lacks a phylogenetic diagnosis and its species present conserved morphologies. Therefore, this study aims to analyze the morphological variation of seven species of Pimelodella from the Orinoco River basin in...
This study aimed to assess the association between fertility and the number of fetuses of free-ranging concentrate-supplemented white-tailed deer (Odocoileus virginianus texanus, Mearns 1898) from northern Mexico (27 °N) with body measurements and serum metabolites indicative of nutritional status. We studied 119 female deer (31 yearlings and 88 adults) captured in January 2021...
Bird assemblages are increasingly threatened by anthropogenic factors, leading to growing concern about their key role in natural ecosystems. This has led to the creation of conservation programs, however, one of the greatest obstacles to this end is the lack of updated information on the species distribution and taxonomic status. In Colombia, which is recognized as the country...
To study the gross and microscopic anatomy of the digestive system and adjoining organs (liver and pancreas) of Megaloperinus myuscorum, 25 adult specimens of both sexes, with a total length of 32.5 cm and 339 g, were euthanized. Serial 5 μm sections were obtained by paraffin technique and stained with hematoxylin-eosin. The mouth is relatively small in a subterminal position...
The composition of fish assemblages in the Alvarado Lagoon System was updated with information collected between 1966 and 2008, divided into nine collection periods; a temporal analysis of the variation in species richness, species richness indices, rarity, and composition of ecological and trophic guilds was also carried out. A total of 113 species were recognized, 66 of which...
In Venezuela, Antillean manatees (Trichechus manatus manatus) have declined mainly due to habitat loss and degradation, but other threats to the species persist. The objective of this work was to investigate the manatee distribution and conservation issues in Maracaibo Lake, Venezuela. Aiming to collect evidence on manatee presence, we conducted 404.14 hours of boat- based...
Irazú volcano is one of the highest peaks in Costa Rica; it constitutes one of the few sites with the plant association known as montane and sub-paramo. The research aimed to characterize the structure and composition of this ecosystem considering two altitudinal floors (montane and subpáramo). Three 1000 m2 plots per forest type were established, in which botanical...
The population structure and somatic condition of intertidal gastropods can be affected by the degree of exposure to waves on rocky coasts. We studied the influence of wave exposure and climatic temporality on the sizes and somatic condition of two species of intertidal neogastropods (Plicopurpura patula and Vasula deltoidea), at different sites within the coastal strip of Santa...
Artificial breeding sites in urban areas have favored the domestication of mosquito vectors. Scrap tires are an important breeding source for mosquito larvae. Few efforts have been made to establish appropriate management measures for used tires, which poses a challenge for larval control activities. Here we mention the inconveniences of tire disposal and the physical and...
Proteins are the molecular machinery that allows the correct functioning of the cells. To achieve these functions, proteins establish interaction between them. There are several molecular techniques to understand the interactions, such as yeast-two-hybrid, co-immunoprecipitation, GST pull-down, cell localization, BiFC, and FRET. This review presents a general description of these...
Antibiotics have been used in livestock farming worldwide. In poultry farming, sulfonamide antibiotics are mainly used to inhibit microbial infection. Sulfadiazine (SDZ) is one type of sulfonamide that is secreted into the ecosystem through feces and urine owing to its low adsorption and degradation in the animal intestine. In this study, the spore-bound laccase from the Bacillus...
Anurans play a central role in food webs, being prey for different vertebrates, like snakes, mammals, fishes, and birds. The snakes from the tribe Tachymenini are known for their preference for preying on anurans, even different animals eventually being part of their diet. Data about Dryophylax chaquensis diet is resumed mainly by field observations and only anurans are known as...
Boana caiapo is a hylid treefrog with occurrence in the states of Goiás, Mato Grosso, Pará, and Tocantins. We provide a new record of the occurrence of B. caiapo in the state of Mato Grosso, Brazilian Cerrado (Neotropical Savana). The record extends its known distribution approximately 330 km Northwest of the type locality (Aragarças municipality, Goiás) and 263 km Northwest of...
Bacteria inhabiting the gut of malaria vectors can strongly influence their biology and competence to transmit Plasmodium parasites and other pathogens. This study aimed to isolate and characterize the culturable gut bacterial microbiota in two main Colombian malaria vectors. Anopheles (Diptera: Culicidae) darlingi Root, 1926 and Anopheles (Diptera: Culicidae) nuneztovari...
The assembly of the non-flying terrestrial mammal community of Gandoca-Manzanillo National Wildlife Refuge, Gandoca locality, Costa Rica, was analyzed. Sherman and Tomahawk traps, camera traps, day and night walks were used, and surveys were applied to locals. A total of 22 species were recorded, belonging to six orders; Rodentia and Carnivora were the most represented, with...
Evaluating several biodiversity descriptors and considering several spatial scales might elucidate conservation issues and improve biodiversity monitoring in urban environments. We estimated species richness (order q = 0), Shannon diversity (order q = 1), and Simpson diversity (order q = 2) based on Hill numbers and performed cluster analysis and non-metric multidimensional...
The Madre de Dios River, in the Peruvian Amazon, is a body of water that receives tailings and waste containing mercury (Hg) discharged by artisanal, informal, and illegal gold mining. The ecotoxic effect of heavy metals in surface water and sediments of the Madre de Dios River was evaluated on the microcrustacean Daphnia magna and the fish Paracheirodon innesi, in surface water...
Ucides occidentalis is a crab with fishery importance in Ecuador. The objective of this work was to estimate its abundance in an area of mangrove use and custody, in the Gulf of Guayaquil, Ecuador. The population density was represented by the density population and size, determined by the distance sampling using transect points. A total of 38 sampling sites were established by a...
Between 2010 and 2020 a study was conducted on the functionality of the ecological corridors within the San José de Matadepantano farm, a property of 811 ha located in plains piedmont, which alternates poorly drained savannas, swamps, and forests, with land uses for agriculture, livestock, and the infrastructure of a rural university campus.To evaluate the functionality of the...
In mixed infections between begomoviruses, common in tropical and subtropical regions, events such as transcomplementation and transreplication can occur. The aim of this research was to evaluate the possibility of asymmetric transreplication and transcomplementation events between Potato yellow mosaic virus (PYMV) and three begomoviruses previously isolated from tomato crop...
There is evidence that all plants coexist with endophytes, indicating a fundamental role that is unknown. The objective was to evaluate the biotechnological potential of endophytes from Passiflora edulis f. edulis in two aspects: as a plant growth promoter and as a control for the pathogen Fusarium oxysporum. An in vitro phase was used in which the antifungal activity in a dual...
Clear-cutting and weeding of riparian habitats in peri-urban watercourses are common practices that may lead to a lower cover and to changes in vegetation assemblages, encompassing increments in the proportion of exotic and ruderal species. The aim of this work was to study the herbaceous assemblages prior to and along three years after deforestation in the Lujan's River...
This study evaluates the potential of the flat oyster Isognomon alatus as a biomonitor species for metal contamination, based on bioaccumulation patterns in adults and juveniles present in the Seaflower Biosphere Reserve on San Andrés Island (Colombia) in three seasons climatic. The analysis by Atomic Absorption Spectrometry of I. alatus specimens and water samples collected in...
Mosquitoes represent the most important agent disseminating infectious diseases like yellow fever, dengue, chikungunya, and malaria, among others. An essential strategy for its control is killing them at immature stages using industrial insecticides. However, those chemicals often generate resistance and affect the environment and human health. Agricultural and plant by-products...