Romeo Manuel Spínola

Romeo Manuel Spínola
National University of Costa Rica | UNA · Instituto Internacional en Conservación y Manejo de Vida Silvestre (ICOMVIS)

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23
Publications
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365
Citations

Publications

Publications (23)
Thesis
Full-text available
Las especies exóticas invasoras amenazan la biodiversidad en ecosistemas terrestres, de agua dulce y marinos. La mayoría de las especies invasores marinos tienden a ocupar niveles tróficos bajos, y en particular los invasores vertebrados, que ocupan niveles tróficos superiores son mucho más raros. El pez león es la primera especie exótica invasora...
Article
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 of species with temperature-dependent sex determination. Taking into account that sea turtle reproductive output depends on cli...
Article
We test a new species distribution modelling (SDM) framework, while comparing results to more common distribution modelling techniques. This framework allows for the combination of presence-only (PO) and presence-absence (PA) data and accounts for imperfect detection and spatial bias in presence data. The new framework tested here is based on a Poi...
Article
Full-text available
The Great Curassow (Crax rubra) is an endangered species in Costa Rica due to habitat loss and hunting pressure. Little is known about the spatial ecology of cracids and there is a need to assess their distribution to establish efficient conservation strategies. In this study, we integrated camera trapping data with occupancy models to examine land...
Article
Full-text available
We report data on the density, phenology, and biomass of Craugastor underwoodi from Parque Nacional Tapantí (PNT) obtained in 1994–95, and from Estación Biológica Río Macho (EBRM) in 2012–13. We sampled large frogs and froglets using transects of defined width along Sendero La Oropéndola (SLO) at PNT, and quadratic sampling in an old-growth forest...
Article
Full-text available
Mammalian carnivores play an important role in regulating food webs and ecosystems. While many carnivore populations are facing various threats such as habitat loss and fragmentation, poaching, and illegal trade, others have adapted to human-domi- nated landscapes. Information about Neotropical carnivore communities in particular is limited, especi...
Article
Full-text available
We used camera traps to survey 38 forested sites in the San Juan – La Selva Biological Corridor, northern Costa Rica. From our survey, we obtained photographs of 62 individuals of the Great Currassow (Crax rubra), 34 of which were females. Among those females, we identified two of the three different morphs existing within this species, the dark mo...
Article
Full-text available
Loss of large mammalian carnivores may allow smaller mesopredators to become abundant and threaten other community members. There is considerable debate about mesopredator release and the role that other potential factors such as land-scape variables and human alterations to land cover lead to increased mesopredator abundance. We used camera traps...
Preprint
Full-text available
Loss of large mammalian carnivores may allow smaller mesopredators to become abundant and threaten other community members. There is considerable debate about mesopredator release and the role that other potential factors such as landscape variables and human alterations to land cover lead to increased mesopredator abundance. We used camera traps t...
Preprint
Loss of large mammalian carnivores may allow smaller mesopredators to become abundant and threaten other community members. There is considerable debate about mesopredator release and the role that other potential factors such as landscape variables and human alterations to land cover lead to increased mesopredator abundance. We used camera traps t...
Article
Full-text available
Noninvasive camera-traps are commonly used to survey mammal communities in the Neotropics. This study used camera-traps to survey medium and large mammal diversity in the San Juan – La Selva Biological Corridor, Costa Rica. The connectivity of the corridor is affected by the spread of large-scale agriculture, cattle ranching, and a growing human pr...
Data
Full-text available
Pairing noninvasive surveys with capture-recapture analysis to estimate demographic parameters for Dendrobates auratus (Anura: Dendrobatidae) from an altered habitat in Costa Rica. Amphibian populations are in decline worldwide. Monitoring programs are important, but many studies use invasive techniques to handle, mark, and identify individuals. We...
Article
Full-text available
Bats host a broad diversity of coronaviruses (CoVs), including close relatives of human pathogens. There is only limited data on neotropical bat CoVs. We analyzed fecal, blood and intestine specimens from 1,562 bats sampled in Costa Rica, Panama, Ecuador and Brazil for CoVs by broad-range PCR. CoV RNA was detected in 50 bats representing nine diffe...
Article
Full-text available
During 2006, we conducted riparian surveys to detect river otter Lontra canadensis latrines at 15 bridge-suites along riverine habitats in southwestern Pennsylvania and western Maryland, USA. We defined a bridge-suite as consisting of survey locations at the bridge, a random site and a site chosen by application of a Pattern Recognition Model devel...
Article
Full-text available
Character displacements are differences in the size of closely related sympatric species. As focal hypothesis, this assumes that similar species could not coexist without segregation because of interspecific competition. If interspecific competition generates segregation, allowing coexistence in sympatric, we question what the ecological distance o...
Article
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 compared precision of estimates of density and detectability of whistling northern bobwhites (Colinus virginianus) using distance sa...
Article
Full-text available
Although the olive ridley sea turtle (Lepidochelys olivacea) is the most abundant sea turtle in the world, the species has exhibited a significant decrease in the size of arribadas at Nancite Beach, Costa Rica, since its discovery in 1970. In the present study, we compiled data on number of nesting females per arribada from previous authors for the...
Article
Full-text available
We assessed the status and trends of northern bobwhite (Colinus virginianus) populations in Ohio from 1984-2004 (21 years). Bobwhite abundance indices were obtained from surveys conducted on secondary roads. The number of roads surveyed per year ranged from 69 to 209 (with 12 stops each). We used Poisson regression with generalized estimating equat...
Article
Full-text available
Survival and post-release movements of individuals translocated for reintroduction purposes have implications for intra-specific interactions, which are essential for reproduction, and, ultimately, for the success of the reintroduction effort. Between 1997–1998, 28 (14M:14F) Lontra canadensis (river otters) were translocated to the Genesee River, N...
Article
G. Ceballos, J. A. Simonetti(eds.) 2002. Diversidad y Conservacion de los Mamiferos Neotropicales. Comision Nacional para el Conocimiento y Uso de la Biodiversidad, Mexico, D. F., Mexico. 582 pp. ISBN 970-9000-18-7, price (paper), $15.00. The Neotropics comprise a large and highly diverse region, extending from tropical Mexico south to Tierra del...

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