Publicaciones científicas sobre investigaciones hechas en el Área de Conservación Guanacaste http://hdl.handle.net/11606/1 2026-02-08T20:07:27Z 2026-02-08T20:07:27Z Norman, David http://hdl.handle.net/11606/1556 2024-02-20T20:35:41Z 2023-01-01T00:00:00Z

Guía de Campo de los Reptiles y Anfíbios del Área de Conservación Guanacaste Norman, David El objetivo de esta guía de campo es ayudar a las personas que visiten el ACG a identificar las especies de anfibios y reptiles que encuentran allí. Saber identificar a las especies, o sea, poniéndole el nombre al animal que encontramos, tiene multiples beneficios. Para entender como funciona un ecosistema, hay que distinguir una especie de la otra. Si no, seria intentar entender como funciona una escuela sin poder distinguir entre las cocineras, las consierges, las secretarias, las guardas en las puertas, la directora, la enfermera, la profesora de matemáticas, la profesora de música, etc. Saber quien es quien nos permite llegar a ser observadores más atentos en nuestro afán de fijarnos en pequeñas diferencias de forma, color, o comportamiento. También facilita nuestro aprendizaje acerca del uso de hábitat, cadenas alimentárias, patrones de movimiento y más. En otras palabras, tener experiencias mas enriquecedoras

2023-01-01T00:00:00Z Monge Velázquez, Michelle Langen, Tom Sáenz, Joel http://hdl.handle.net/11606/1553 2022-10-31T17:33:55Z 2022-04-30T00:00:00Z

Seasonal High Road Mortality of Incilius luetkenii (Anura: Bufonidae) Along the Pan-American Highway Crossing the Guanacaste Conservation Area, Costa Rica Monge Velázquez, Michelle; Langen, Tom; Sáenz, Joel The Pan-American Highway in Costa Rica is currently undergoing expansion in capacity as a response to growth in vehicle traffic associated with growing international trade. This highway bisects the Pacific lowlands Tropical Dry Forest of the Guanacaste Conservation Area, a World Heritage site of the United Nations Educational, Scientific and Cultural Organization, with notably high biodiversity, including herpetofauna. As wildlifevehicle collisions are one of the main direct causes of animal mortality, we quantified the species composition, seasonality, and location of amphibians and reptiles killed along a 30 km segment of the highway running through the conservation area. From August 2016 to February 2017, we mapped roadkill hotspots using Kernel Density Estimation (KDE) with KDE+ software. We detected 1,298 carcasses of 28 species, including seven anuran, one caecilian, three lizard, 15 snake, and two turtle species; the Neotropical Yellow Toad (Incilius luetkenii) comprised over half the total roadkill. The two most severe roadkill hotspots were short road segments near seasonally flooded depressional wetlands where I. luetkenii and other anurans breed. We urge construction of mitigation measures including barriers and subterranean passages to conserve amphibian populations, especially if the Pan-American Highway will be widened at these sites.

2022-04-30T00:00:00Z Rose, Andreas Tschapka, Marco Knörnschild, Mirjam http://hdl.handle.net/11606/1540 2022-08-31T00:28:58Z 2020-07-21T00:00:00Z

Visits at artificial RFID flowers demonstrate that juvenile flower-visiting bats perform foraging flights apart from their mothers Rose, Andreas; Tschapka, Marco; Knörnschild, Mirjam During the transition from parental care to independent life, the development of adequate foraging skills is a major challenge for many juvenile mammals. However, participating in their parents’ knowledge by applying social learning strategies might facilitate this task. For several mammals, communal foraging of adults and offspring is suggested to be an important mechanism in mediating foraging-related information. For the large mammalian taxon of bats, only little is known about foraging-related social learning processes during ontogeny. It is often suggested that following their mothers during foraging flights would represent a valuable option for juveniles to socially learn about foraging, e.g., where to find resource-rich foraging patches, but explicit tests are scarce. In the present study, we investigated the foraging behavior of juvenile flower-visiting bats (Glossophaga soricina) in a dry forest in Costa Rica. We tested whether recently volant, but still nursed pups perform foraging flights alone, or whether pups follow their mothers, which would enable pups to socially learn where to feed. For that, we trained mothers and pups to feed from artificial flowers with a RFID reading system and, subsequently, conducted a field experiment to test whether RFID-tagged mothers and pups visit these flowers communally or independently. Unexpectedly, pups often encountered and visited artificial flowers near the day roost, while mothers rarely did, suggesting that they foraged somewhere further away. Our results demonstrate that still nursed juveniles perform foraging flights apart from their mothers and might learn about the spatial distribution of food without participating in their mother’s knowledge, for instance, by following other conspecifics or applying individual learning strategies. An initial potential lack of foraging success in this period is likely compensated by the ongoing maternal provisioning with breast milk and regurgitated nectar during daytime. Our results contribute to the growing body of research on the ontogeny of mammalian foraging behavior in general.

2020-07-21T00:00:00Z Mlynarek, Julia J. http://hdl.handle.net/11606/1537 2022-08-31T00:28:47Z 2019-10-30T00:00:00Z

Revision of the New World genus Enderleiniella Becker, 1912 (Diptera, Chloropidae) Mlynarek, Julia J. The genus Enderleiniella Becker, 1912 is revised. The genus is distinguished on the basis of a somewhat flattened head with the inner vertical setae located anteromedially to the outer vertical setae, three lightly incised lines on the scutum, trapezoidal or rectangular scutellum with marginal setae borne on tubercles, reduced alula and anal angle of the wing, and the structure of the male genitalia. The genus contains eleven species in the northern Neotropical and southern Nearctic Regions: E. caerulea sp. nov. (type locality: Blue Creek, Belize); E. cryptica sp. nov. (type locality: 24 km W Piedras Blancas, Costa Rica); E. flavida sp. nov. (type locality: Emerald Pool, Dominica); E. longiventris (Enderlein, 1911) (type species; type locality: Costa Rica); E. maculata sp. nov. (type locality: Xilitla, San Luis Potosi, Mexico); E. marshalli sp. nov. (type locality: Guanacaste, Costa Rica); E. maya sp. nov. (type locality: Las Escobas, Guatemala); E. punctata sp. nov. (type locality: Potrerillo, Bolivia); E. tripunctata (Becker, 1916) (type locality: San Mateo, Costa Rica); E. tumescens sp. nov. (type locality: San Esteban, Venezuela); and E. wheeleri sp. nov. (type locality: Turrialba, Costa Rica).

2019-10-30T00:00:00Z