Browsing Artículos científicos by Title
Now showing items 365-384 of 555
-
Mesoamerican tree squirrels evolution (Rodentia: Sciuridae): a molecular phylogenetic analysis
(Universidad de Costa Rica, 2014)The tribe Sciurini comprehends the genera Sciurus, Syntheosiurus, Microsciurus, Tamiasciurus and Rheinthrosciurus. The phylogenetic relationships within Sciurus have been only partially done, and the relation ship between ... -
Microalgas en estanques de tilapia y su potencial biotecnológico, ambiental e industrial
(Universidad Estatal a Distancia (Costa Rica), 2013)Las microalgas han sido ampliamente estudiadas a nivel mundial, sin embargo en el trópico hacen falta más estudios relacionados con su identificación y posibles usos biotecnológicos. Los estanques de tilapias son ecosistemas ... -
Microhabitat heterogeneity associated with Vanilla spp. and its influences on the microbial community of leaf litter and soil
(Springer Nature, 2020-09)The impact of forest microhabitats on physiochemical properties of the soil and that of microbial communities on tropical soils remain poorly understood. To elucidate the effect of tropical forest stand on leaf litter ... -
Microplastics found in the World Heritage Site Cocos Island National Park, Costa Rica
(Instituto Nacional de Investigación y Desarrollo Pesquero - INIDEP (Argentina), 2022)Microplastics (MPs) defined as ‘small’ pieces of plastic < 5 mm have been found in almost every marine habitat around the world, and studies have shown that we can find them in the ocean surface, the water column, the ... -
El modelo Bandler-Grinder de aprendizaje y la enseñanza de genética mendeliana en estudiantes costarricenses de décimo año
(Universidad Estatal a Distancia (Costa Rica), 2012-12)En Costa Rica existen muy pocas investigaciones en el área de la enseñanza de la genética en secundaria, a pesar de la importancia que tiene esta disciplina actualmente, siendo base fundamental para otras áreas de las ... -
Un modelo biogeoquímico para el Golfo de Nicoya, Costa Rica
(Universidad de Costa Rica, 2007)In agreement with the Broecker and Penn two-boxes model, I generated a biogeochemical balance model for the Gulf of Nicoya (Guanacaste, Costa Rica) using two nutrient reservoirs: surface water and deep water. The mixing ... -
Modificación del índice de calidad de riberas: Inclusión del componente social en la evaluación de la calidad ribereña de la microcuenca del río Burío-Quebrada Seca
(Universidad Nacional (Costa Rica), 2017-01-31)Esta investigación se basó en la comparación de los resultados obtenidos mediante la aplicación del índice de calidad de riberas-QBR (Munné et al., 2003) y el índice de calidad de riberas modificado-QBRm (Araya y Fernández, ... -
Molecular identification of Streptococcus sp. and antibiotic resistance genes present in Tilapia farms (Oreochromis niloticus) from the Northern Pacific region, Costa Rica
(European Aquaculture Society (Bélgica), 2021-07-24)Streptococcosis is a bacterial disease in tilapia that produces economic losses, caused mainly by Streptococcus agalactiae and S. iniae. It is treated using oxytetracycline and florfenicol, which when inappropriately ... -
Morfometría, época reproductiva y talla comercial de Macrobrachium americanum (crustacea: palaemonidae) en Guanacaste, Costa Rica
(Universidad Nacional, Costa Rica, 1996)Macrobrachium americanum was collected in the San Amires River, Santa Cruz, Guanacaste, Co sta Rica (lOO 22' 00" N; 85043' 00" W), from March 1984 to Apri11985. Fo r 290 specimens the relationship tota l lengthto tal ... -
Moribaetis brachiostrinus (Ephemeroptera: Baetidae), a new species of mayfly from Costa Rica
(Magnolia Press, 2018)A new species of Moribaetis is described based on nymphs from the Nicoya peninsula. The new species can be distin guished from the other described species of the genus, among other characteristics, by its short antennae, ... -
Morphometry of the fruits of Genipa americana (Rubiaceae): a case study from the southern coast of Bahia, Brazil
(Instituto de Pesquisas Jardim Botânico do Rio de Janeiro (Brasil), 2021)We conducted a study to assess the morphometric attributes of Genipa americana fruit, and their relationship with variations in elevation and distances between sampling sites on the southern coast of Bahia, Brazil. Eight ... -
Mortalidad embrionaria y éxito de eclosión en huevos de Trachemys scripta (Testudines: Emydidae) incubados en un área natural protegida
(Universidad de Costa Rica, 1996)In the northeast of Costa Rica, ilIega! collecting, habitat destruction and heavy predation 011 adult females, young and eggs of Trachemys scripta produced a population decline in recent years. The slider tUltle has a ... -
Mortalidad masiva del pez tamboril Canthigaster rostrata (Tetraodontiformes: Tetraodontidae) en el Caribe sur de Costa Rica durante 2020
(Instituto de Investigaciones Marinas y Costeras “José Benito Vives de Andréis” (Colombia), 2023)Durante 2020 ocurrió un evento de mortalidad masiva del pez Canthigaster rostrata en el Refugio de Vida Silvestre Gandoca-Manzanillo (Regama), en la costa Caribe sur de Costa Rica; mismo que se suma a registros previos ... -
Natalidad de Chelydra serpentina (Testudines: Chelydridae) en Costa Rica
(Universidad de Costa Rica, 1996)Three Chelydra serpentina nests were monitored from September through October 1993. Maximum natality was 92% (mean 33.73%) and seemed to be associated with high temperature potasium and a moderate concentration of calcium ... -
Neighborhood structure influences the convergence in light capture efficiency and carbon gain: An architectural approach for cloud forest shrubs
(Tree Physiology vol.36 no.6 712-724 2016, 2016-03-24)Although plant competition is recognized as a fundamental factor that limits survival and species coexistence, its relative importance on light capture efficiency and carbon gain is not well understood. Here, we propose a ... -
Neighbourhood structure and light availability influence the variations in plant design of shrubs in two cloud forests of different successional status
(Annals of Botany, 2016-07)Background and Aims Plant design refers to the construction of the plant body or its constituent parts in terms of form and function. Although neighbourhood structure is recognized as a factor that limits plant survival ... -
Nematode assemblages in four ecosystems of Parque Nacional del Agua, Costa Rica
(Elsevier (Países Bajos), 2022)The soil nematode fauna of five locations situated in Parque Nacional del Agua (PNA) in Costa Rica is characterized and analyzed. Four ecosystems were sampled in each location: primary (undisturbed) forest, secondary (naturally ... -
Neotropical flowering epiphyte diversity: local composition and geographic affinities
(Universidad Nacional, Costa Rica, 2013)Worldwide, the highest diversity of vascular epiphytic plants resides in the Neotropics. The general pattern of taxonomic composition of the neotropical epiphytic flora has been described, but information regarding the ... -
Nesting ecology of East Pacific green turtles at Playa Cabuyal, Gulf of Papagayo, Costa Rica
(2014-07)East Pacific green turtles (Chelonia mydas), often referred to as black turtles, are smaller and exhibit a lower reproductive output than other populations of green turtles in the Atlantic, Indian and Western Pacific Oceans. ... -
New records of Pteris (Pteridaceae) from the Neotropics
(Universidad Nacional (Costa Rica), 2014)As a result of studies on neotropical Pteris L., we report new records of Pteris albertiae and P. longifoliafrom Costa Rica; P. longipetiolulata from Costa Rica, Panama, Peru, Bolivia, and Venezuela; and P. muricatopedatafrom ...