Browsing Facultad de Ciencias de la Tierra y el Mar by Issue Date
Now showing items 21-40 of 1082
-
First nest record of the Bare-shanked screech-owl (Otus clarkii)
(Universidad Nacional, Costa Rica., 1997)Reportamos el primer registro de anidación de la Lechucita Serranera (Otus clarkii), encontrado en las tierras altas de Costa Rica. El nido se localizó en un árbol de encino (Quercus copeyensis) a una altura de 3.3m en una ... -
Ambito de hogar y utilización de hábitat de dos grupos de venados Cola Blanca Odocoileus virginianus (Artiodactyla: Cervidae) reubicados en un ambiente tropical
(Universidad Nacional, Costa Rica, 1998)Eight white-tailed deer were released in La Emilia farm, Guanacaste, Costa Rica, during November 1987 and March 1988. Four females were from an insular population (San Lucas Island, ISL) and had been raised in captivity ... -
Growth of Mantled Howler Groups in a Regenerating Costa Rican Dry Forest
(Universidad Nacional, Costa Rica., 1998)We examined population dynamics in mantled howlers (Alouatta palliata palliata) in a regenerating tropical dry forest in Santa Rosa National Park (SRNP), Costa Rica. The population has grown at a rate of about 7% per annum ... -
Pn-wave observations in Costa Rica
(Universidad Nacional Autónoma de México, 1998-02-18)Tiempos de arribos, medidos en la Red Sismográfica de Costa Rica, fueron empleados para extraer información sobre la corteza y el manto por debajo de Costa Rica. Datos de tiempos de arribo de la onda P y S de 100 sismos ... -
ANTOLOGÍA SOBRE POLITIONATOS: COMPUESTOS DE AZUFRE EXISTENTES EN LOS LAGOS CRATÉRICOS DE VOLCANES ACTIVOS
(Revista de Vulcanología, Sismología y Tectónica., 1999)En la siguiente recopilación bibliográfica sobre los oxianiones de azufre llamados politionatos, con fórmula general SxO6 2-, se contemplan algunas de sus propiedades físico-químicas, y se hace énfasis principalmente en ... -
Neotropical dry forest wildlife water hole use and management
(Universidad Nacional, Costa Rica., 1999)Selected wildlife species diurnal use of a natural water hole (QO) and an artificial water hole (AW) were studied during 1990 dry season at Guanacaste Conservation Area, Costa Rica. In total, 919 individuals (six marnmal ... -
Late dry season habitat use of common opossum, Didelphis marsupialis (Marsupialia: Didelphidae) in neotropical lower montane agricultural areas
(Universidad Nacional, Costa Rica., 1999)Three Didelphis marsupialis were radio tracked during late dry season (23 February-26 April, 1983) in agricultural area at 1500 m elevation in Central Valley, Costa Rica. All animals were nocturnally active, significantly ... -
Efecto de las actividades humanas sobre la diversidad de mamíferos terrestres en un gradiente altitudinal
(Universidad Nacional, Costa Rica., 1999)The effect ofhuman activity on terrestrial marnmals was studied with footprint counts in Guanacaste, Costa Rica (loo30"N, 85°40'W) in February 1998 (in fifty 2 m2 quadrats). The most cornmon species were Canis latrans, ... -
Seismic cycle and plate margin deformation in Costa Rica: GPS observations from 1994 to 1997
(American Geophysical Union, 1999-12-10)Global Positioning System (GPS) observations in Costa Rica from 1994 to 1997 reveal a complex pattern of motion consistent with the superposition of seismic cycle and secular plate margin deformation. In the south, velocity ... -
Dieta estacional del Tayassu pecari (Artiodactyla: Tayassuidae) en el Parque Nacional Corcovado, Costa Rica
(Universidad Nacional, Costa Rica., 2000)The diet of the white-lipped peccari Tayassu pecari was studied from July 1996 to April 1997 in Cor covado National Park, Costa Rica, through fecal analysis and direct observations. The feces consisted of 61.6% fruits, ... -
Evaluation of a battery of toxicity tests for use in the assessment of water quality in a Costa Rican laboratory
(Wiley Periodicals, Estados Unidos, 2000)The Laboratory for Ecotoxicological Studies (ECOTOX) of IRET evaluated the following toxicity tests: Daphnia magna (daphnia test), Hydra attenuata (hydra test), Allium sp. (onion test), Panagrellus redivivus (nematode ... -
Mapa Geológico de la Hoja Istarú
(Oficina de Defensa CivilDirección de Geología Minas y PetróleoMinisterio de Industria y Comercio, 2000)Digitalización del Mapa Geológico de la Hoja Istarú, como parte de las actividades del Proyecto "Utilización de modelaje computacional y SIG como herramientas para la gestión de riesgo por caída de ceniza proveniente del ... -
Analysis of seismic and acoustic observations at Arenal Volcano, Costa Rica, 1995–1997
(Elsevier Science, 2000-08)In November 1995, we installed five, three-component broadband seismometers and electronic tiltmeters around the circumference of Arenal Volcano, a young stratovolcano in Costa Rica that exhibits strombolian activity. With ... -
A female of Eudorylaimus sp with two vulvae.
(Universidad Nacional, Costa Rica, 2001)A female of Eudorylaimus sp, with two vulvae was found in Tempisque Conservation Area in Costa Rica. Thousands of nematodes have been prepared in Cobb's slides to study nematode diversity in Costa Rica; nevertheless, only ... -
El cerdo cimarrón (Sus scrofa, Suidae) en la Isla del Coco, Costa Rica: Composición de su dieta, estado reproductivo y genética
(Universidad Nacional, Costa Rica., 2001)Feral pigs (Sus scrofa) cause different kinds of damage specially on oceanic islands. Pigs were introduced at Cocos Island, Costa Rica, during 1793 and bred successfully. I analised feral pigs diet, reproductive state, ... -
El cerdo cimarrón (Sus scrofa, Suidae) en la Isla del Coco, Costa Rica: Escarbaduras, alteraciones al suelo y erosión
(Universidad Nacional, Costa Rica., 2001)Feral pigs (Sus scrofa) are of the most damaging exotic vertebrates, specially on oceanic island nativecommunities. Feral pigs inhabit Cocos Island since 1793 and there are around 400-500 individuals. In order toquantify ... -
An improved P-wave velocity reference model for Costa Rica
(Universidad Nacional Autónoma de México, 2001-01-01)Derivamos un modelo de velocidad unidimensional para la onda P en Costa Rica, el cual puede servir en la rutina de localización de eventos sísmicos y como modelo de referencia para tomografía en 3 dimensiones. La inversión ... -
Acute health effects of organophosphorus pesticides on Tanzanian small-scale coffee growers
(Nature Publishing Group, 2001-07-01)A cute health effects of organophosphorus (PP) pesticides on coffee farmworkers in 1991-1992 in Tanzania are reported to provide a basis for concern over farmworkers being overexposed during application. Workers exposed ... -
Attempts to culture the parasitic stage of Dermatobia hominis (L. Jr.) in vitro (Diptera: Cuterebridae)
(Universidad Nacional, Costa Rica, 2002)A nationwide survey in Costa Rica, using Kellert's conceptual framework (Kellert, S.R. 1996. The Value of Life. Washington D.C., Island Press), revealed at least five attitude dimensions toward animals. Overall, Costa Rican ...