Browsing Artículo Científico by Title
Now showing items 42-61 of 98
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Ecological corridors in Costa Rica: An evaluation applying landscape structure, fragmentation-connectivity process, and climate adaptation
(Society for Conservation Biology, 2021-05-20)In recent years, ecological corridors have been proposed on a global scale as a response to the accelerated process of natural ecosystem fragmentation, mainly as a result of human impact. In accordance with this trend, ... -
Education as a tool for addressing the extinction crisis: Moving students from understanding to action
(Universidad Nacional, Costa Rica., 2010)Human activity is leading to mass species extinctions worldwide. Conservation biology (CB) courses, taught worldwide at universities, typically focus on the proximal causes of extinction without teaching students how ... -
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, ... -
Effect of extreme climatic events resulting in prolonged precipitation on the reproductive output of sea turtles
(Universidad Nacional, Costa Rica., 2018)Anthropogenic climate change is predicted to increase the variation in storm patterns in some areas in the coming decades. This variation in mean rainfall and increase in mean temperature could increase the extinction risk ... -
Effect of prey availability on the abundance of White-breasted Wood-Wrens, insectivorous birds of tropical lowland forests
(Universidad Nacional, Costa Rica., 2014)Some understory insectivorous birds manage to persist in tropical forest fragments despite significant habitat loss and forest fragmentation. Their persistence has been related to arthropod biomass. In addition, forest ... -
Evaluación de corredores biológicos en Costa Rica: estructura de paisaje y procesos de conectividad fragmentación
(Universidad Nacional, Costa Rica, 2020-04-21)En el planeta, durante los últimos años, los corredores biológicos han proliferado como respuesta al proceso acelerado de fragmentación de los ecosistemas naturales. Basada en esta estrategia, Costa Rica desde la década ... -
Evaluation of Three Methods to Estimate Density and Detectability From Roadside Point Counts
(Universidad Nacional, Costa Rica., 2011)Roadside point counts are often used to estimate trends of bird populations. The use of aural counts of birds without adjustment for detection probability, however, can lead to incorrect population trend estimates. We ... -
Exploitation of white-lipped peccaries Tayassu pecari (Artiodactyla: Tayassuidae) on the Osa Peninsula, Costa Rica
(Universidad Nacional, Costa Rica., 2002)We studied movements of white-lipped peccaries (Tayassu pecari, Artiodactyla, Tayassuidae) throughout the Osa Peninsula and their use by local people during 1997-2000, using interview techniques. We draw five main conclusions: ... -
Exploitation of white-lipped peccaries Tayassu pecari (Artiodactyla: Tayassuidae) on the Osa Peninsula, Costa Rica
(Universidad Nacional, Costa Rica., 2002)We studied movements of white-lipped peccaries (Tayassu pecari, Artiodactyla, Tayassuidae) throughout the Osa Peninsula and their use by local people during 1997-2000, using interview techniques. We draw five main conclusions: ... -
External parasites of raptors (Falconiformes and Strigiformes): identification in an ex situ population from Mexico
(Universidad Nacional, Costa Rica., 2011)Raptorial birds harbor a variety of ectoparasites and the mayority of them are host specific. The aim of this study was to identify the ectoparasites of captive birds of prey from Mexico, as well as to verify their impact ... -
Extraction of hermit crabs from their shells by white-faced capuchin monkeys (Cebus capucinus)
(Primates, 2016-09-28)We observed two capuchin monkeys (Cebus capucinus) feeding on hermit crabs (Coenobita compressus) on the coast, and the tactics they used to extract this well-protected prey. The observations took place during the dry ... -
Factors affecting Jaguar and Puma predation on livestock in Costa Rica
(Wildlife Biology in Practice, 2016-06)Throughout their range, wild felids in the Americas prey on livestock and this sometimes leads to retaliatory killing. Recently, conservation and research programs focused on such conflicts have recommended mitigation and ... -
Factors influencing the occurrence of the Endangered Baird's tapir Tapirus bairdii: Potential flagship species for a Costa Rican biological corridor
(ORYX, 2014)Dengue fever is the fastest spreading, most prevalent and deadly arthropod-borne viral disease world-wide, present in over 125 countries. In 2013, Costa Rica is experiencing the highest number of Dengue infec-tions since ... -
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 ... -
Food niche overlap among neotropical frugivorous bats in Costa Rica
(Universidad Nacional, Costa Rica., 2006)Food habits of 15 species of frugivorous bats were studied at La Selva Biological Station, Costa Rica. Eight hundred and fifty-four (854) fecal samples and 169 samples from fruit parts and seeds discarded by bats beneath ... -
Forest structure and territory size relationship in the neotropical understorey insectivore Henicorhina leucosticta
(Universidad Nacional, Costa Rica., 2010)The neotropical terrestrial insectivore Henicorhina leucosticta (Troglodytidae) maintains long-term territories through vocalizations and forages among leaf litter trapped in the understorey vegetation and ground litter. ... -
Genetic patterns and conservation of the Scarlet Macaw (Ara macao) in Costa Rica
(Springer, 2015)Once widely distributed throughout the lowland forests of Costa Rica, scarlet macaws (Ara macao) have been reduced to two major, geographically separated, pop ulations along the Pacific slope. Past demographic declines ... -
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 ... -
Habitat features influencing jaguar Panthera onca (Carnivora: Felidae) occupancy in Tortuguero National Park, Costa Rica
(Universidad Nacional, Costa Rica., 2014)Habitat characteristics and human activities are known to play a major role in the occupancy of jag uars Panthera onca across their range, however the key variables influencing jaguar distribution in Tortuguero National ... -
Habitat features influencing jaguar Panthera onca (Carnivora: Felidae) occupancy in Tortuguero national park, Costa Rica [Características del hábitat que influyen en la presencia del jaguar Panthera onca (Carnivora: Felidae) en el parque nacional Tortuguero, Costa Rica]
(Revista de Biologia Tropical, 2014-08-13)Habitat characteristics and human activities are known to play a major role in the occupancy of jaguars Panthera onca across their range, however the key variables influencing jaguar distribution in Tortuguero National ...