viernes, 15 de febrero de 2019

Primer Curso de Primavera en Tecnicas de Monitoreo y Manejo de Aves Silvestres




Siguiente oportunidad para prepararse. ¿Te gustan las aves? ¿Quisieras aprender a identificaras? y ¿conocer las diferentes técnicas de monitoreo? Tu oportunidad es ahora. Primer Curso de Primavera en Técnicas de Monitoreo y Manejo de Aves Silvestre. Lo ofrece COBIUS en colaboración con el Maestro Juan Manuel Koller González de la Universidad Juárez Autónoma de Tabasco y se realizará en las instalaciones de la UMA Saraguatos. Mayores informes INBOX o a los teléfonos y correo señalados en el Cartel. Mayores informes aquiINFO CURSO



lunes, 28 de enero de 2019

NO SOLO LOS PRIMATES SON AFECTADOS POR LA PERTURBACION DEL HABITAT SINO TODAS SUS INTERACCIONES INCLUYENDO LA DINAMICA DE SUS PARASITOS.

Habitat disturbance disrupts the ecological interactions of mammals, leading to negative
consequences for biodiversity. In particular, it is suggested that parasite-host interactions are
affected in tropical ecosystems, with parasite diversity reduced as environmental perturbations
take place. In this study, we examined whether the disruption of tropical forests affects the
presence of parasites in a population of endangered black howler monkeys (Alouatta pigra)
that inhabits a highly fragmented landscape in Balancán, Tabasco, Mexico. Our working
hypothesis was that increased forest perturbation would negatively affect the incidence of
parasitic infections (parasite presence and richness) in black howler monkeys. We conducted a
parasitological study and collected stool samples from 65 adult individuals living in 30 forest
fragments across a disturbance gradient. We recovered parasite eggs from stool samples
using flotation and sedimentation techniques. We selected fragment size and distance from
each forest fragment to the nearest village as measures of forest perturbation. We analyzed
the effects of forest perturbation on parasite presence and richness using generalized linear
models. Other driving factors such as seasonality, host density, and sex were also considered
in the models. Gastrointestinal parasite infection was positively related to distance between
forest fragments and the nearest human settlement (β = 0.55 ± SE 0.28, z = 2.0, P = 0.05). No
effects of fragment size or any other variable considered in the model on the presence of
parasite infection were observed. Parasite richness was not affected by any of the measures of
forest perturbation, nor by any other variables considered in the analysis. Our findings suggest
that an increase in forest perturbation may negatively affect the probability of parasite infection
in black howler monkeys, as individuals living in close proximity to human settlements showed
a lower presence of parasites. We proposed that the low parasite infection rates recorded in
this monkey population reflect synergistic effects associated with both the alteration of the
parasite-primate network, as well as the low resilience of parasites to thrive in a disrupted
ecosystem.

viernes, 25 de enero de 2019

SALE A LA LUZ UNA NUEVA Y ACTUALIZADA DISTRIBUCIÓN POTENCIAL DE PRIMATES EN MEXICO. ESTA VEZ VALIDADA POR UN PANEL DE EXPERTOS Y POR DATOS DE COBIUS 2013- 2016.

Ecological niche modeling is used to estimate species distributions based on occurrence records and environmental variables, but it seldom includes explicit biotic or historical factors that are important in determining the distribution of species. Expert knowledge can provide additional valuable information regarding ecological or historical attributes of species, but the influence of integrating this information in the modeling process has been poorly explored. Here, we integrated expert knowledge in different stages of the niche modeling process to improve the representation of the actual geographic distributions of Mexican primates (Ateles geoffroyi, Alouatta pigra, and A. palliata mexicana). We designed an elicitation process to acquire information from experts and such information was integrated by an iterative process that consisted of reviews of input data by experts, production of ecological niche models (ENMs), and evaluation of model outputs to provide feedback. We built ENMs using the maximum entropy algorithm along with a dataset of occurrence records gathered from a public source and records provided by the experts. Models without expert knowledge were also built for comparison, and both models, with and without expert knowledge, were evaluated using four validation metrics that provide a measure of accuracy for presence-absence predictions (specificity, sensitivity, kappa, true skill statistic). Integrating expert knowledge to build ENMs produced better results for potential distributions than models without expert knowledge, but a much greater improvement in the transition from potential to realized geographic distributions by reducing overprediction, resulting in better representations of the actual geographic distributions of species. Furthermore, with the combination of niche models and expert knowledge we were able to identify an area of sympatry between A. palliata mexicana and A. pigra. We argue that the inclusion of expert knowledge at different stages in the construction of niche models in an explicit and systematic fashion is a recommended practice as it produces overall positive results for representing realized species distributions.

COBIUS PRESENTA SU ESTRATEGIA ESTATAL DE CONSERVACION DE LA BIODIVERSIDAD EN LA REGION USUMACINTA

     Esta presentación describe a la organización COBIUS desde sus inicios y como ha ido evolucionando, hasta llegar a realizar impactos importantes en pro de la conservación de la diversidad biológica de nuestro país (MEXICO). Se proponen 10 acciones para Conservar y Proteger la Cuenca del Rio Usumacinta. 

This presentation describes the COBIUS organization from its beginnings and how it has evolved, until reaching the most important realization in favor of the conservation of biological diversity in our country (MEXICO). Ten actions are proposed to conserve and protect the Usumacinta River Basin.