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7 resultados encontrados para: AUTOR: Rivero Hernández, Crysia Marina
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1.
Artículo
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Population status, connectivity, and conservation action for the endangered Baird's tapir
Schank, Cody J. (autor) ; Cove, Michael V. (autor) ; Arima, Eugenio Y. (autor) ; Brandt, Laroy S. E. (autor) ; Brenes Mora, Esteban (autor) ; Carver, Andrew (autor) ; Diaz Pulido, Angelica (autora) ; Estrada, Nereyda (autora) ; Foster, Rebecca J. (autora) ; Godínez Gómez, Oscar (autor) ; Harmsen, Bart J. (autor) ; Jordan, Christopher A. (autor) ; Keitt, Timothy H. (autor) ; Kelly, Marcella J. (autora) ; Sáenz Méndez, Joel (autor) ; Mendoza Ramírez, Eduardo (autor) ; Meyer, Ninon France Victoire (autora) ; Pozo Montuy, Gilberto (autor) ; Naranjo Piñera, Eduardo Jorge (autor) (1963-) ; Nielsen, Clayton K. (autor) ; O´Farril Cruz, Elsa Georgina (autora) ; Reyna Hurtado, Rafael Ángel (autor) ; Rivero Hernández, Crysia Marina (autora) ; Carvajal Sánchez, José Pablo (autor) ; Singleton, Maggie (autora) ; Torre, J. Antonio de la (autor) ; Wood, Margot A. (autora) ; Young, Kenneth R. (autor) ; Miller, Jennifer A. (autora) ;
Disponible en línea
Contenido en: Biological Conservation Volumen 245, número 108501 (May 2020), p. 1-12 ISSN: 0006-3207
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Resumen en: Inglés |
Resumen en inglés

Although many large mammals currently face significant threats that could lead to their extinction, resources for conservation are often scarce, resulting in the need to develop efficient plans to prioritize conservation actions. We combined several methods in spatial ecology to identify the distribution of the endangered Baird's tapir across its range from southern Mexico to northern Colombia. Twenty-eight habitat patches covering 23% of the study area were identified, harboring potentially 62% or more of the total population for this flagship species. Roughly half of the total area is under some form of protection, while most of the remaining habitat (~70%) occurs in indigenous/local communities. The network with maximum connectivity created from these patches contains at least one complete break (in Mexico between Selva El Ocote and Selva Lacandona) even when considering the most generous dispersal scenario. The connectivity analysis also highlighted a probable break at the Panama Canal and high habitat fragmentation in Honduras. In light of these findings, we recommend the following actions to facilitate the conservation of Baird's tapir: 1) protect existing habitat by strengthening enforcement in areas already under protection, 2) work with indigenous territories to preserve and enforce their land rights, and help local communities maintain traditional practices; 3) re-establish connections between habitat patches that will allow for connectivity across the species' distribution; 4) conduct additional noninvasive surveys in patches with little or no species data; and 5) collect more telemetry and genetic data on the species to estimate home range size, dispersal capabilities, and meta-population structure.


2.
Artículo
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Precipitous decline of white-lipped peccary populations in Mesoamerica
Thornton, Daniel (autor) ; Reyna Hurtado, Rafael Ángel (autor) ; Perera Romero, Lucy (autora) ; Radachowsky, Jeremy (autor) ; Hidalgo Mihart, Mircea Gabriel (autor) ; García Anleu, Rony (autor) ; McNab, Roan (autor) ; Mcloughlin, Lee (autor) ; Foster, Rebecca (autora) ; Harmsen, Bart (autor) ; Moreira Ramírez, José Fernando (autor) ; Diaz Santos, Fabricio (autor) ; Jordan, Christopher A. (autor) ; Salom Pérez, Roberto (autor) ; Meyer, Ninon France Victoire (autor) ; Castañeda, Franklin (autor) ; Elvir Valle, Fausto Antonio (autor) ; Ponce Santizo, Gabriela (autora) ; Amit, Ronit (autora) ; Arroyo Arce, Stephanny (autora) ; Thomson, Ian (autor) ; Moreno, Ricardo (autor) ; Schank, Cody J. (autor) ; Arroyo Gerala, Paulina (autora) ; Bárcenas, Horacio V. (autor) ; Brenes Mora, Esteban (autor) ; Calderón, Ana Patricia (autora) ; Cove, Michael V. (autor) ; Gómez Hoyos, Diego (autor) ; González Maya, José F. (autor) ; Guy, Danny (autor) ; Hernández Jiménez, Gerobuam (autor) ; Hofman, Maarten (autor) ; Kays, Roland (autor) ; King, Travis (autor) ; Martinez Menjivar, Marcio Arnoldo (autor) ; Maza, Javier de la (autor) ; León Pérez, Rodrigo (autor) ; Ramos, Víctor Hugo (autor) ; Rivero Hernández, Crysia Marina (autora) ; Romo Asunción, Sergio (autor) ; Juárez López, Rugieri (autor) ; Jesús de la Cruz, Alejandro (autor) ; De la Torre, Jesús Antonio (autor) ; Towns, Valeria (autora) ; Schipper, Jan (autor) ; Portillo Reyes, Hector Orlando (autor) ; Artavia, Adolfo (autor) ; Hernández Pérez, Edwin Luis Oswaldo (autor) ; Martínez, Wilber (autor) ; Urquhart, Gerald R. (autor) ; Quigley, Howard (autor) ; Pardo, Lain E. (autor) ; Sáenz, Joel C. (autor) ; Sanchez, Khiavett (autora) ; Polisar, John (autor) ;
Contenido en: Biological Conservation Vol. 242, no. 108410 (2020), p. 1-12 ISSN: 0006-3207
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Resumen en: Inglés |
Resumen en inglés

Large mammalian herbivores are experiencing population reductions and range declines. However, we lack regional knowledge of population status for many herbivores, particularly in developing countries. Addressing this knowledge gap is key to implementing tailored conservation strategies forspecies whose population declines are highly variable across their range. White-lipped peccaries (Tayassupecari) are important ecosystem engineers in Neotropical forests and are highly sensitive to human disturbance. Despite maintaining a wide distributional range, white-lipped peccaries are experiencing substantial population declines in some portions of their range.We examined the regional distribution and population status of the species in Mesoamerica. We used a combination of techniques, including expert-based mapping and assessment of population status, and data-driven distribution modelling techniques to determine the status and range limits of white-lipped peccaries. Our analysis revealed declining and highly isolated populations of peccaries across Mesoamerica, with a range reduction of 87% from historic distribution and 63% from current IUCN range estimates for the region. White-lipped peccary distribution is affected by indices of human influence and forest cover, and more restricted than other sympatric large herbivores, with their largest populations confined to transboundary reserves. To conserve white-lipped peccaries in Mesoamerica, transboundary efforts will be needed that focus on both forest conservation and hunting management, increased cross-border coordination, and reconsideration of country and regional conservation priorities. Our methodology to detail regional white-lipped peccary status could be employed on other poorly-known large mammals.


3.
Tesis - Maestría
Estimando densidades del tapir centroamericano (Tapirus bairdii) en la Sierra Madre de Chiapas / Crysia Marina Rivero Hernández
Rivero Hernández, Crysia Marina (0000-00020-8207-4171) ; Reyna Hurtado, Rafael Ángel (director) ; Naranjo Piñera, Eduardo Jorge (asesor) (1963-) ; Tobler, Mathias W. (asesor) ;
Lerma, Campeche, México : El Colegio de la Frontera Sur , 2019
Clasificación: TE/599.727097275 / R5
Bibliotecas: Campeche
Cerrar
SIBE Campeche
ECO040006970 (Disponible)
Disponibles para prestamo: 1
Resumen en español

El tapir centroamericano (Tapirus bairdii) es una especie que se encuentra en peligro de extinción en toda su área de distribución. En México, una de las poblaciones más importantes se encuentra en la región de la Sierra Madre de Chiapas (SMC). Sin embargo, se conoce poco acerca de su estado de conservación y las densidades que presenta en dicha región. Actualmente, los estudios realizados con fototrampeo, en combinación con diferentes modelos como captura recaptura y marcaje recaptura espacialmente explícitos (SCR y SMR), así como los modelos de encuentro aleatorio (REM) se han vuelto una herramienta muy popular para estimar densidades de especies que no presentan un patrón de marcaje natural, como es el caso del tapir centroamericano. El objetivo principal del proyecto fue proporcionar una estimación de densidad estadísticamente robusta para el tapir centroamericano en el área natural protegida La Frailescana, situada en la Sierra Madre de Chiapas, por medio de un análisis comparativo para evaluar el comportamiento de tres modelos diferentes (SCR, SMR y REM) para estimar densidades. Además, se identificaron las limitaciones y requerimientos metodológicos de cada uno de estos modelos para su aplicación y se propuso un tamaño poblacional para la Sierra Madre de Chiapas basado en los resultados de densidad obtenidos. La estimación de la densidad fue más alta y menos precisa al usar el REM en comparación con los modelos espacialmente explícitos. El modelo SCR proporcionó la estimación de densidad más baja en comparación con la SMR, pero SMR tuvo los intervalos de confianza más pequeños, lo que representa la estimación de densidad más precisa.

Creamos modelos de ocupación para extrapolar la densidad a las áreas con mayor probabilidad de ocupación del tapir centroamericano para obtener un tamaño poblacional robusto para la SMC. Nuestro estudio es el primero en estimar la densidad de una población de tapir centroamericano bajo diferentes enfoques y nos permitió definir prioridades de conservación enfocados a dichos resultados.


4.
- Capítulo de libro con arbitraje
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Insights of the movements of the jaguar in the tropical forests of southern Mexico
De la Torre, José Antonio (autor) ; Rivero Hernández, Crysia Marina (autora) ;
Disponible en línea
Contenido en: Movement ecology of neotropical forest mammals: focus on social animals / Rafael Reyna-Hurtado, Colin A. Chapman, editors Switzerland, Suiza : Springer Nature Switzerland AG, 2019 páginas 217-241
Bibliotecas: Campeche
Cerrar
SIBE Campeche
10933-20 (Disponible)
Disponibles para prestamo: 1
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Resumen en: Inglés |
Resumen en inglés

Movement is a critical animal behavior which reflects animal response to its current biological needs and to its environment. Comprehending how and why the animals use the available space and the underlying drivers of animal movements is essential to the management and conservation for both species and ecosystems. This chapter aims to understand and describe the movements of the largest felid of the Neotropics, the jaguar (Panthera onca), through different approaches with the purpose to contribute to the existing knowledge of the spatial ecology of this species and to design strong conservation actions for the jaguar in the tropical forest of Central America. We described the movement ecology of jaguars in tropical forests using the information of five individuals fitted with satellite GPS collars in the Greater Lacandona Ecosystem, Chiapas, Mexico. We estimate the home range of jaguars through the autocorrelated kernel density estimation and compare it with different studies implemented throughout the species range. Using the movement-based kernel approach analyzed under the biased random bridge model, we identify the areas that were intensively used and repeatedly visited by the jaguars inside their home range.

The biased random bridge allowed having a more dynamic and realistic approach to describe the space use and habitat selection by jaguars which complement the information about the movements of the species for the region. Finally, we evaluate the movement decisions of jaguars by the step selection function to identify which landscape variables influence the movement behavior of the species in the Greater Lacandona Ecosystem. The development of new movement models and analytical tools have allowed to make more precise inferences regarding the space use and movements of secretive tropical species such as the jaguar which should translate in better conservation strategies to ensure their long-term conservation.


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Resumen en: Español | Inglés |
Resumen en español

El tapir de Baird es el más grande de las especies de tapires Neotropicales y está considerado como en peligro por la UICN. La Reserva de la Biosfera de Calakmul (CBR por sus siglas en ingles) es el área de bosque tropical protegido mas grande de México y se encuentra en el corazón de la Selva Maya, un bosque tri-nacional localizado entre Belice, Guatemala y México considerado el bosque tropical mas extenso de Mesoamérica. El agua de lluvia en la CBR percola al subsuelo y solamente en pocos sitios (localmente conocidos como aguadas) se almacena agua en el suelo. Estos sitios son raros en el paisaje con una densidad de uno cada 10 km2 y una distancia promedio de 3 km entre aguadas. Solamente algunos de esos sitios conserva agua durante la época seca de cada año. Se detectó una reducción de la disponibilidad de agua desde el 2008 al 2018. Documentamos la población de tapires durante estos años y examinamos la relación con este patrón de reducción de la disponibilidad de agua. Usando la técnica de foto-trampeo monitoreamos entre 9 a 15 aguadas en 8 años dentro de este periodo de 11 años. Con un total de mas de 18,000 días-cámaras encontramos que aunque la población de tapires de la CBR permanece estable en promedio el índice de abundancia relativa detectó una ligera disminución en la abundancia y en algunas aguadas se asoció con la falta de agua. Estudios de largo plazo de especies en peligro asociadas a cuerpos de agua son importantes porque permiten estimar los efectos de la disponibilidad de agua y predecir futuros escenarios para las poblaciones de fauna silvestre. Esta información es esencial para elaborar planes de conservación de especies en peligro y sensibles tales como el Tapir de Baird.

Resumen en inglés

Baird’s tapir is the largest Neotropical tapir species, and it is considered Endangered by the IUCN. The Calakmul Biosphere Reserve (CBR) is the largest protected tropical forest in Mexico. The CBR is at the heart of the Maya Forest, a tri-national forest located in Mexico, Guatemala, and Belize that is the largest tropical forest outside the Amazon River basin. Free-standing water in the CBR occurs in only a few ephemeral ponds. These ponds are rare in the landscape, with a mean density of one pond in every 10 km2, and with an average distance among ponds of 3 km. Only some of these ponds have free-standing water in every year. A decreasing trend in water availability from these ponds was detected from 2008 to 2018. Our present objective was to document population of the tapirs during these 11 years, and reveal any relationship to the pattern of water availability. Using the technique of photo-trapping, we monitored from 9 to 15 ponds over a period of 8 years (a total of more than 18,000 camera-days) during the 11-year period. Results showed that although the population remained relatively stable, the index of relative abundance indicated a slight decrease in population abundance and in some sites seemed at least superficially associated with decreasing water availability. Such long-term population studies are becoming more important for estimating the impacts of possible changes and for predicting the future of populations. In turn, they assist the conservation of endangered and sensitive species such as Baird’s tapir.


6.
Artículo
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Assessing occupancy and habitat connectivity for Baird’s tapir to establish conservation priorities in the Sierra Madre de Chiapas, Mexico
De la Torre, José Antonio ; Rivero Hernández, Crysia Marina (coaut.) ; Camacho, Gamaliel (coaut.) ; Álvarez Márquez, Luis Arturo (coaut.) ;
Contenido en: Journal for Nature Conservation Vol. 41 (February 2018), p. 16-25 ISSN: 1617-1381
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Resumen en: Inglés |
Resumen en inglés

Baird’s tapir (Tapirus bairdii) is the largest native mammal that inhabits the Neotropics, and it is enlisted as Endangered by the IUCN Red List. The historic distribution of this species included the area from southern Mexico to northern Colombia. However, its distribution and populations have been reduced drastically during the past 30 years. The main threats for Baird’s tapir are the direct persecution for subsistence hunting, habitat destruction, and habitat fragmentation. In this study, we used camera traps and occupancy models to identify the landscape characteristics that were associated with the occurrence of tapirs in the Sierra Madre de Chiapas, which is one of the most important populations of the species in Mexico, with the aim to identify areas with habitat suitability for the species. We used our best occupancy model to generate a resistance matrix to develop a model of habitat connectivity using Circuit Theory. According to the best occupancy model, the most suitable areas for this species were the forested areas located at the highest elevations of the mountain ranges that provided rugged terrain. We identified three critical corridors to allow for the connectivity of tapir populations in the Sierra Madre de Chiapas, and one of these corridors provides connectivity between this population and the population in the Ocote Biosphere Reserve. With this approach, we propose a conservation strategy for the species that incorporates a more realistic and detailed scheme of Baird’s tapir occurrence in the Sierra Madre de Chiapas region. Priority actions to conserve tapirs in the Sierra Madre de Chiapas over the long term include ensuring the complete protection of prime habitat for the species, improved connectivity by protecting forest cover, implementation mitigation measures in areas where paved roads interrupt connectivity of populations, and eradicating poaching of the species in the region completely.


7.
- Artículo con arbitraje
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Using a novel model approach to assess the distribution and conservation status of the endangered Baird’s tapir
Schank, Cody J. ; Cove, Michael V. (coaut.) ; Kelly, Marcella J. (coaut.) ; Mendoza Ramírez, Eduardo (coaut.) ; O´Farril Cruz, Elsa Georgina (coaut.) ; Reyna Hurtado, Rafael Ángel (coaut.) ; Meyer, Ninon France Victoire (coaut.) ; Jordan, Christopher A. (coaut.) ; González Maya, José F. (coaut.) ; Lizcano, Diego J. (coaut.) ; Moreno, Ricardo (coaut.) ; Dobbins, Michael T. (coaut.) ; Montalvo, Víctor (coaut.) ; Sáenz Bolaños, Carolina (coaut.) ; Carillo Jiménez, Eduardo (coaut.) ; Estrada, Nereyda (coaut.) ; Cruz Díaz, Juan Carlos (coaut.) ; Sáenz, Joel (coaut.) ; Spínola, Manuel (coaut.) ; Carver, Andrew (coaut.) ; Fort, Jessica (coaut.) ; Nielsen, Clayton K. (coaut.) ; Botello, Francisco (coaut.) ; Pozo Montuy, Gilberto (coaut.) ; Rivero Hernández, Crysia Marina (coaut.) ; De la Torre, José Antonio (coaut.) ; Brenes Mora, Esteban (coaut.) ; Godínez Gómez, Oscar (coaut.) ; Wood, Margot A. (coaut.) ; Gilbert, Jessica (coaut.) ; Miller, Jennifer A. (coaut.) ;
Contenido en: Diversity and Distributions Vol. 23, no. 12 (December 2017), p. 1459–1471 ISSN: 1809-127X
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Resumen en: Inglés |
Resumen en inglés

Aim: 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 Poisson point process model, which allows for predictions of population size. We compared these estimates to those provided by experts on the species. Species and Location: Presence data on Baird’s tapir (Tapirus bairdii) throughout its range from southern México to northern Colombia were used in this research, primarily from the years 2000 to 2016. Methods: Four SDM frameworks are compared as follows: (1) Maxent, (2) a presence-only (PO) SDM based on a Poisson point process model (PPM), (3) a presence-absence (PA) SDM also based on a PPM and (4) an Integrated framework which combines the previous two models. Model averaging was used to produce a single set of coefficient estimates and predictive maps for each model framework. A hotspot analysis (Gi*) was used to identify habitat cores from the predicted intensity of the Integrated model framework. Results: Important variables to model the distribution of Baird’s tapir included land cover, human pressure and topography. Accounting for spatial bias in the presence data affected which variables were important in the model. Maxent and the Integrated model produced predictive maps with similar patterns and were considered to be more in agreement with expert knowledge compared to the PO and PA models.

Main conclusions: Total abundance as predicted by the model was higher than expert opinion on the species, but local density estimates from our model were similar to available independent assessments. We suggest that these results warrant further validation and testing through collection of independent test data, development of more precise predictor layers and improvements to the model framework.