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Rasgos de los forófitos de Guazuma ulmifolia y Samanea saman y su influencia en la distribución espacial, abundancia y diversidad de plantas epífitas
(2021)Los rasgos de la corteza en los forófitos influyen en el establecimiento y la distribución espacial de plantas epífitas. Ante esto, en el campus de la Universidad Técnica Nacional, sede Atenas, Costa Rica, se evaluó la ... -
Recent findings of Isthmohyla pictipes (Anura: Hylidae) in Costa Rica: variation and implications for conservation
(2020-10-21)We report recent findings of Isthmohyla pictipes (Cope, 1875) in the Cordillera de Talamanca, Costa Rica, roughly two decades after it was last registered. We provide notes on microhabitat use, color variation, external ... -
Recent origin and rapid speciation of Neotropical orchids in the world's richest plant biodiversity hotspot
(2017)The Andean mountains of South America are the most species‐rich biodiversity hotspot worldwide with c. 15% of the world's plant species, in only 1% of the world's land surface. Orchids are a key element of the Andean flora, ... -
Recircumscription of Pityphyllum (Orchidaceae: Maxillariinae)
(2006-03)Based upon morphological and molecular evidence, Maxillaria huancabambae (Kraenzl.) C. Schweinf. and M. saragurensis Dodson are transferred to Pityphyllum Schltr. These and other species of Pityphyllum are illustrated with ... -
Recolecta de artrópodos para prospección de la biodiversidad en el Área de Conservación Guanacaste, Costa Rica
(Revista de Biología Tropical 52(1): 119-132, 2004, 2004)This study describes the results and collection practices for obtaining arthropod samples to be studied as potential sources of new medicines in a bioprospecting effort. From 1994 to 1998, 1800 arthropod samples of 6-10 g ... -
Recomendaciones para mejorar el manejo de comederos artificiales para colibríes
(2019)El uso de comederos artificiales para alimentar a las aves es una práctica extendida y de uso generalizado principalmente en sitios turísticos, tales como hoteles de montaña, parques naturales, y jardines privados. En el ... -
Reconsideration of Trichosalpinx minutipetala (Ames & C.Schweinf.) Luer (Orchidaceae: Pleurothallidinae)
(2011-02)Trichosalpinx minutipetala, considered a synonym of T. memor since 1997, is here recognized as a distinct species. -
Rediscovering the value of families for psychiatric genetics research
(2018-06-28)As it is likely that both common and rare genetic variation are important for complex disease risk, studies that examine the full range of the allelic frequency distribution should be utilized to dissect the genetic ... -
Redox stress reshapes carbon fluxes of Pseudomonas putida for cytosolic glucose oxidation and NADPH generation
(2020)The soil bacterium and metabolic engineering platform Pseudomonas putida tolerates high levels of endogenous and exogenous oxidative stress, yet the ultimate reason of such property remains unknown. To shed light on this ... -
Reduced activity of Arabidopsis chromosome-cohesion regulator gene CTF7/ECO1 alters cytosine methylation status and retrotransposon expression
(2015-05-01)Multicellular organisms such as higher plants require timely regulation of DNA replication and cell division to grow and develop. Recent work in Arabidopsis has shown that chromosome segregation during meiosis and mitosis ... -
Reef environments of murciélago islands and Santa Elena peninsula, Guanacaste conservation area, Costa Rican pacific
(2021)The ecology of the marine environments of the Murciélago Islands and the Santa Elena Peninsula have been studied little despite their high biodiversity. This area is influenced by a coastal upwelling. In 2014, 2016 and ... -
Regeneración de la vegetación arbórea en una pequeña reserva forestal urbana del nivel premontano húmedo, Costa Rica
(Rev. Biol. Trop., 44(2): 575-580,1996, 1996)The tropical premontane moist forest is one of the most destructed Iife zones in Costa Rica. For such regions, a small natural preserve system has been proposed. An inventory of trees greater ... -
Registro de géneros de ácaros en reinitas (Parulidae) de Costa Rica
(2017)Las aves son hospederas de una gran diversidad de ácaros, pueden vivir en la superficie de las plumas, en las patas (Latta 2003) la piel, los nostrilos y las vías respiratorias (Proctor 2003). Los ácaros plumícolas son ... -
Relaciones hídricas en árboles del bosque tropical seco: el caso de Enterolobium cyclocarpum
(2011)Las relaciones hídricas en árboles de Enterolobium cyclocarpum del Parque Nacional Santa Rosa, Costa Rica, se estudiaron en diferentes momentos del curso diurno y a lo largo de dos ciclos fenológicos. La característica ... -
Relationship between isoprene emission and photosynthesis in diatoms, and its implications for global marine isoprene estimates
(2017)Global consensus estimates of marine isoprene emission (~ 1 TgC yr− 1) is significantly smaller than terrestrial isoprene emission (~ 500 TgC yr− 1), and the reasons are unclear. With the premise that isoprene emission is ... -
Relationship between species richness of excavator birds and cavity–adopters in seven tropical forests in costa rica
(2009)The abundance of wood cavities is thought to be a limiting factor for bird species that depend on these cavities for nesting. Thus, it is expected that number of cavity adopters correlates with number of cavity excavators ... -
Relative Importance for Lincoln’s Sparrow (Melospiza lincolnii) Occupancy of Vegetation Type versus Noise Caused by Industrial Development
(2022)Anthropogenic noise can create an acoustic environment detrimental for animals that communicate using acoustic signals. Currently, most studies of noise and wildlife come from traffic noise in cities. Less is known about ... -
Release of Nitrosamines and Nitrosamine Precursors from Scrap Tires | Environmental Science & Technology Letters
(American Chemical Society, 2021)Materials used during manufacturing of tires can be a source of nitrosamines and/or their precursors. Here, we examined the leaching of nitrosamines and nitrosamine precursors from scrap tires under different test conditions. ... -
A reliable bioassay procedure to evaluate per os toxicity of Bacillus thuringiensis strains against the rice delphacid, Tagosodes orizicolus (Homoptera: Delphacidae)
(Universidad de Costa Rica, 2007)A reliable bioassay procedure was developed to test ingested Bacillus thuringiensis (Bt) toxins on the rice delphacid Tagosodes orizicolus. Initially, several colonies were established under greenhouse conditions, using ... -
A remarkable new species and additional novelties of Chamaedorea from Costa Rica and Panamá. Notables nuevas especies y novedades adicionales de Chamaedorea de Costa Rica y Panamá
(1997)Three of the four new spp. of Chamaedorea (Arecaceae) described here are endemic (as far as is known) to Costa Rica. The "remarkable" one is C. piscifolia Hodel, G. Herrera & Casc., with simple, apically bifid and long-caudate, ...