Dos nuevos registros de Vampyrum spectrum in Honduras

RESUMENDe las 113 especies de murciélagos que están registradas en Honduras, Vampyrum spectrum es una de las especies con menos registros publicados. A nivel global se considera dentro de la categoría Casi Amenazada, mientras que en Honduras esta clasificada como una especie de Preocupación Especial. Esta nota tiene como objetivo presentar dos nuevos registros de Vampyrum spectrum en Honduras. El primero fue realizado en la zona de amortiguamiento del Parque Nacional Sierra de Agalta en el municipio de Catacamas, Olancho. El segundo corresponde a un individuo muerto en la comunidad de Brus Laguna en el departamento de Gracias a Dios. Aún se necesita más información acerca de esta especie, pero de acuerdo con sus registros históricos y actuales, requiere sitios con estados de conservación moderados a buenos y con una conectividad arbórea alta para poder sobrevivir. Es necesario trabajar en programas de educación biológica para disminuir las amenazas a las poblaciones causadas por el desconocimiento y la desinformación que hay sobre esta y otras especies.Palabras clave: distribución, falso vampiro, miskitos, murciélagos. ABSTRACTOf the 113 species of bats registered in Honduras, Vampyrum spectrum is one of the species with few published records. It is considered within the Near Threatened Category, while In Honduras it is classify as a species of Special Concern. This note aims to present two new records of this species in Honduras. The first was carried out in the Sierra de Agalta National Park buffer zone in the municipality of Catacamas, Olancho. The second corresponds to an individual who died in the Brus Laguna community in Gracias a Dios department. More information about this species is still needed. According to its historical and current records, it requires sites with moderate to good conservation status and high tree connectivity to survive. It is necessary to work on biological education programs to reduce threats to populations caused by ignorance and misinformation about this and other species.Key words: bats, distribution, False Vampire, Miskitos.

Characterization of microstructures using contour tree connectivity for fluid flow analysis

Quantifying the connectivity of material microstructures is important for a wide range of applications from filters to biomaterials. Currently, the most used measure of connectivity is the Euler number, which is a topological invariant. Topology alone, however, is not sufficient for most practical purposes. In this study, we use our recently introduced connectivity measure, called the contour tree connectivity (CTC), to study microstructures for flow analysis. CTC is a new structural connectivity measure that is based on contour trees and algebraic graph theory. To test CTC, we generated a dataset composed of 120 samples and six different types of artificial microstructures. We compared CTC against the Euler parameter (EP), the parameter for connected pairs, the nominal opening dimension ( d nom ) and the permeabilities estimated using direct pore scale modelling. The results show that d nom is highly correlated with permeability ( R 2 = 0.91), but cannot separate the structural differences. The groups are best classified with feature combinations that include CTC. CTC provides new information with a different connectivity interpretation that can be used to analyse and design materials with complex microstructures.