Browsing Biología by Title
Now showing items 517-536 of 1644
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Efectos de la actividad turística en los patrones de comportamiento de Stenella Attenuata Gray, 1846 (Delfín manchado) del Pacifico Central de Costa Rica
(2002-06-01)El turismo en torno a delfines ha aumentado a escala global, durante las últimas dos décadas en forma significativa y fundamentalmente afectando a especies costeras. Esta actividad con frecuencia, no es llevada a cabo ... -
Efectos de la dieta de cafetería y del consumo voluntario de alcohol en la expresión de genes relacionados con plasticidad neuronal en el sistema de recompensa
(2023)El aumento de la obesidad a nivel global y regional representa un problema de salud pública, dadas las complicaciones crónicas asociadas a esta condición. La obesidad es un rasgo complejo en el que intervienen factores ... -
Efectos de la Fragmentación de Bosques y la Fenología de Floración sobre el Éxito Reproductivo y los Patrones de Apareamiento de Pachira quinata, un Árbol de Bosque Tropical Seco
(2003)Los resultados de varios estudios sugieren que la fragmentación de bosques afecta los patrones deapareamiento y de éxito reproductivo de especies de árboles tropicales al reducir la actividad de poliniza-dores, la deposición ... -
Efectos de la Fragmentación del Bosque Tropical Seco Sobre el Éxito Reproductivo y la Estructura Genética del Arbol Samanea saman
(2002)Tropical trees are particularly vulnerable to forest fragmentation because of their low densities, self-incompatibilty system, and high rates of outbreeding. Forest fragmentation is likely to decrease gene flow, increase ... -
Efectos intergeneracionales de la exposición crónica a microplásticos de baja densidad en el zooplancton: el caso del copépodo Paracalanus parvus en el Golfo de Nicoya, Costa Rica
(2023-09-07)The text discusses the widespread use of plastic, the increasing production of plastic waste, and its entry into the marine environment, primarily through rivers. Plastic waste in the oceans is broken down into microplastics, ... -
Efectos proteolitico, hemorragico y mionecrotico de los venenos de serpientes costarricenses de los generos Bothrops, Crotalus y Lachesis
(1980)We studied the proteolytic, hemorrhagic and myonecrotic activities of ten Costa Rican species of snakes from the family Viperidae. All of them showed these three activities but we did not observe any correlation between ... -
Effect of barriers and distance on song, genetic, and morphological divergence in the highland endemic Timberline Wren (Thryorchilus browni, Troglodytidae)
(2018)Populations may become isolated by distance, geographic barriers or both. Isolated populations often diverge in behavioral, morphological and genetic traits as a result of reduced inter-population gene flow. Highland species ... -
Effect of bromide on NDMA formation during chloramination of model precursor compounds and natural waters
(Water Research, 2020)In this work, we investigated the effect of bromide ion (Br−) on NDMA formation using model precursor compounds, wastewater effluents and surface waters. Previous studies showed that Br− reacts with chloramines and forms ... -
Effect of El Niño and La Niña on abundance of frugivorous and nectarivorous terrestrial birds in three tropical forests
(2019-05-14)El Niño and La Niña climatic oscillations have dramatic effects on population dynamics and community structure of different animals. For marine birds, El Niño phenomenon drastically increases their mortality and reduces ... -
Effect of exposition to chlorpyrifos upon plasmatic cholinesterases, hematology and blood biochemistry values in Bothrops asper (Serpentes: Viperidae)
(2018)The terciopelo (Bothrops asper), is one of the most important venomous snakes in Costa Rica and common on agriculture where insecticides are frequently used for pest control. To assess the exposure to organophosphates on ... -
Effect of forest disturbance on myxomycete assemblages in the southwestern Peruvian Amazon
(2012-06-16)Although the effects of microenvironmental factors on distribution patterns in myxomycetes have been investigated, studies of the responses of this group of organisms to different regimes of forest disturbance are ... -
Effect of fragmentation on the Costa Rican dry forest avifauna
(2016)Deforestation and changes in land use have reduced the tropical dry forest to isolated forest patches in northwestern Costa Rica. We examined the effect of patch area and length of the dry season on nestedness of the entire ... -
Effect of Gamma Irradiation and Selection with Fungus Filtrate (Rhizoctonia solani Kuhn) on the in Vitro Culture of Common Bean (Phaseolus vulgaris)
(2015)The present investigation was undertaken to study the effect of gamma irradiation (dose from 10 to 100 Gy) and in vitro selection with fungus filtrate as selecting agent (concentration from 20% to 100%) on the susceptibility ... -
Effect of high pH on growth of Synechocystis sp. PCC 6803 cultures and their contamination by golden algae (Poterioochromonas sp.)
(2016)Culturing cyanobacteria in a highly alkaline environment is a possible strategy for controlling contamination by other organisms. Synechocystis PCC 6803 cells were grown in continuous cultures to assess their growth ... -
Effect of temperature on the visual displays of the Jacky dragon
(2019)In ectotherms such as lizards, temperature is a key determinant of their behavior and their ability to signal to conspecifics. We asked whether changes in the thermal environment along the distribution of an agamid lizard, ... -
Effect of urbanization on the avifauna in a tropica metropolitan area
(2011)The rapid and unplanned expansion of urban areas is a common pattern in neotropical developing countries. Urbanization has eliminated or drastically altered large areas of natural habitats used by the rich neotropical ...