Explore our Archive

Dive into research that has been authored and co-authored by the Osa Conservation team.

For a complete bibliography of research on the Osa Peninsula, download our Osa Bibliography.

Phenology and environmental determinants of explosive breeding in gliding treefrogs: diel timing of rainfall matters

Authors: Brandon A. Güell, Karen M. Warkentin

Description: The study reveals that rainfall, day-of-year, days since breeding, and lunar phase significantly impact A. spurelli reproductive activity, shedding light on the dynamics of explosive breeding in this species and highlighting the benefits of automated data analysis in ecological research.

Greater Grison (Galictis vittata) predation events upon Paca (Cuniculus paca) suggest a cavity targeted hunting strategy by Greater Grison

Authors: Andrew Whitworth

Description: This study reports two rare predation events by the Greater Grison (Galictis vittata) on the Paca (Cuniculus paca), the largest known prey for the Grison. The observations, collected through cell phones and social media, indicate a unique hunting strategy by the Grison, targeting the burrows of nocturnal cavity-dwelling rodents.

Automated acoustic detection of Geoffroy’s spider monkey highlights tipping points of human disturbance

Authors: Jenna Lawson, George Rizos, Dui Jasinghe, Andrew Whitworth, Björn Schuller, and Cristina Banks-Leite

Description: This study demonstrates the effectiveness of passive acoustic monitoring (PAM) and a newly developed automated detector in detecting the endangered Geoffroy’s spider monkey (Ateles geoffroyi) across a large region. The findings highlight the importance of forest cover and proximity to roads in the monkey’s presence, providing valuable tools for conservation strategies.

More than one way to count a cat: estimation of ocelot population density using frameworks for marked and unmarked species

Authors: Juan S. Vargas Soto, Eleanor J. Flatt, Andrew Whitworth, Roberto Salom‐Pérez, Deiver Espinoza‐Muñoz, Péter K. Molnár

Description: “Here, we estimate the population density of ocelots (Leopardus pardalis) in the Osa peninsula, Costa Rica, comparing methods for marked and unmarked species.”

Remote sensing and citizen science to characterize the ecological niche of an endemic and endangered Costa Rican poison frog

Authors: , and Ivan Gomez-Mestre

Description: Through remote sensing and ecological niche modeling, this study examines the habitat requirements of the endemic Phyllobates vittatus frog in Costa Rica, highlighting the importance of factors such as elevation, forest cover, and proximity to water bodies. The findings inform conservation efforts by identifying potential areas for reintroductions and recommending an adjusted status of “Endangered” for P. vittatus.

Riparian buffer length is more influential than width on river water quality: A case study in southern Costa Rica

Authors: Hilary Brumberg, Chris Beirne, Eben North Broadbent, Angelica Maria Almeyda Zambrano, Sandra Lucia Almeyda Zambrano, Carlos Alberto Quispe Gil, Beatriz Lopez Gutierrez, Rachael Eplee, Andrew Whitworth

Description: “Riparian agriculture and forest affect water quality at least 1 km downstream …  Long, narrow buffers could efficiently conserve water quality in agricultural landscapes.”

Nearshore marine biodiversity of Osa Peninsula, Costa Rica: Where the ocean meets the rainforest

Authors: Alan M. Friedlander, Enric Ballesteros, Odalisca Breedy, Beatriz Naranjo-Elizondo, Noelia Hernández, Pelayo Salinas-de-León, Enric Sala, Jorge Cortés

Description: “The creation of a large MPA in the Osa region … would benefit the rich biodiversity of this part of the country as well as replenishing nearby overexploited important fisheries resources”

Climate-resilient conservation strategies for an endemic forest bird, the Black-cheeked Ant-Tanager

Authors: Patrick B. Newcombe, Adrian Forsyth, Hilary Brumberg, and Andrew Whitworth.

Description: “As biodiversity declines and climate change causes shifts in species distribution, the knowledge of species’ ecological needs is vital to conserve biodiversity. On Costa Rica’s Osa Peninsula and its adjacent forests, a rich mosaic of ecosystems hosting numerous threatened and endemic species, conservationists lack clarity on the basic habitat requirements of the endemic Black-cheeked Ant-Tanager (Habia atrimaxillaris).”

Unexpected diversity in regenerating sites stresses the importance of baselines: A case study with bats (Order Chiroptera) on the Osa Peninsula, Costa Rica

Authors: Elène Haave-Audet, Doris Audet, Michelle Monge-Velazquez, Eleanor Flatt, Andrew Whitworth

Description: “Using an indicator of biodiversity in the neotropics— bats— we demonstrate how assessing community diversity and composition in an area targeted for restoration prior to implementation, and when compared to surrounding intact forest, provides the groundwork to track changes in the community post-restoration.”

Human disturbance and shifts in vertebrate community composition in a biodiversity hotspot

Authors: Juan S. Vargas Soto, Christopher Beirne, Andrew Whitworth, Juan Carlos Cruz Diaz, Eleanor Flatt, Ruthmery Pillco-Huarcaya, Erik R. Olson, Alejandro Azofeifa, Guido Saborío-R, Roberto Salom-Pérez, Deiver Espinoza-Muñoz, Leslie Hay, Lawrence Whittaker, Carmen Roldán, Ricardo Bedoya-Arrieta, Eben North Broadbent, Péter K. Molnár 

Description: “Human activities reduce the presence of large herbivores and predators, affecting ecosystem function, even in well-conserved forests.”

The potential and practice of arboreal camera trapping

Authors: Jennifer F. Moore, Kylie Soanes, Diego Balbuena, Christopher Beirne, Mark Bowler, Farah Carrasco-Rueda, Susan M. Cheyne, Opale Coutant, Pierre-Michel Forget, Jessica K. Haysom, Peter R. Houlihan, Erik R. Olson, Stacy Lindshield, Jonathan Martin, Mathias Tobler, Andrew Whitworth, Tremaine Gregory 

Description: Arboreal camera trapping is a burgeoning method providing a novel and effective technique to answer research questions across a variety of ecosystems, and it has the capacity to improve our understanding of a wide range of taxa.

The first ex-situ germination and dispersal mechanisms of the rare, critically endangered tree, Pleodendron costaricense

Authors: Ruthmery Pillco Huarcaya, Marvin López Morales, Leonardo Álvarez-Alcázar, Andrew Whitworth

Description: Given the propagation knowledge we have developed, the active restoration efforts of the saplings by Osa Conservation to help increase population numbers, and the strict protection of the two fruiting mother trees, there is now the possibility to attain a positive conservation outcome for this critically endangered species, Pleodendron costaricense.

Warm beach, warmer turtles: Using drone-mounted thermal infrared sensors to monitor sea turtle nesting activity

Authors: Bárbara Sellés-Ríos, Eleanor Flatt, Johan Ortiz-García, Júlia García-Colomé, Orane Latour, and Andrew Whitworth

Description: Here we describe the first empirical testing of a drone-mounted thermal infrared sensor for nocturnal sea turtle monitoring; on the Osa peninsula in Costa Rica.

Acoustic assessment of experimental reforestation in a Costa Rican rainforest

Authors: Álvaro Vega-Hidalgo, Eleanor Flatt, Andrew Whitworth, Laurel Symes

Description: Passive acoustic monitoring serves as a useful tool for ecological assessment.

Recovery of dung beetle biodiversity and traits in a regenerating rainforest: A case study from Costa Rica’s Osa Peninsula

Authors: Andrew Whitworth, Chris Beirne, Eleanor Flatt, Graden Froese, Chase Nuñez, Adrian Forsyth

Description: We conducted a comprehensive dung beetle survey (coprophagous and necrophagous communities) within five habitat types, across a land-use gradient, in the ecologically biodiverse Osa Peninsula, located in Costa Rica’s south Pacific.

Habitat selection and diet of the Neotropical otter (Lontra longicaudis) on the Osa Peninsula, Costa Rica, and range-wide monitoring recommendations

Authors: Chris Smith, Andy Whitworth, Elizabeth Brunner & Mateo Pomilia

Description: Using surveys for tracks and latrines from ten rivers on the Osa Peninsula of Costa Rica, we report results on habitat selection at the local and micro-habitat scales, describe the general diet from 127 scats, and broadly discuss detection and general survey methods.

Spider Monkeys rule the roost: Ateline sleeping sites influence rainforest heterogeneity

Authors: Andrew Whitworth, Lawrence Whittaker, Ruthmery Pillco Huarcaya, Eleanor Flatt, Marvin Lopez Morales, Danielle Connor, Marina Garrido Priego, Adrian Forsyth, Chris Beirne

Description: We investigate this using camera traps placed in both the canopy and on the rainforest floor to determine which rainforest wildlife are attracted to the latrines beneath the sleeping sites of spider monkeys …

Secondary forest is utilized by Great Curassows (Crax rubra) and Great Tinamous (Tinamus major) in the absence of hunting

Authors: Andrew Whitworth, Christopher Beirne, Eleanor Flatt, Ruthmery Pillco Huarcaya, Juan Carlos Cruz Diaz, Adrian Forsyth, Péter K. Molnár, Juan S. Vargas Soto

Description: We investigated habitat use of Great Curassows and Great Tinamous in the Matapalo corridor of the Osa Peninsula, southwest Costa Rica, where they are not hunted, to understand whether disturbed habitats can be suitable for these species.

Arboreal wildlife bridges in the tropical rainforest of Costa Rica’s Osa Peninsula

Authors: Eleanor Flatt, Arianna Basto, Carolina Pinto, Johan Ortiz, Kassandra Navarro, Neil Reed, Hilary Brumberg, Marco Hidalgo Chaverri, and Andrew Whitworth

Description: “Arboreal wildlife bridges increase connectivity of fragmented forests by allowing wildlife to safely traverse roads … “

For more information on the Osa Peninsula, download our Osa Bibliography.

This bibliography includes important conservation research publications, including those done by Osa Conservation as well as our research partners seeking to better understand the biodiversity of the region and strategies for protecting our vital ecosystems.