Density of white-tailed deer in relation to vegetation in a landscape of northern Veracruz

Abstract

The white-tailed deer, Odocoileus virginianus, is poorly known in the state of Veracruz, Mexico. In this paper we report the relationships between deer population density and vegetation variables in a landscape in Tantoyuca, northern Veracruz. Pellet groups and vegetation were sampled across 40 strip transects (500 x 2 m) in five locations from April to June 2014. The relationships between deer density and vegetation variables were evaluated with hierarchical agglomerative clustering methods to group tree species per transect, as well as generalized linear models. Density (number of deers/km 2 ) was estimated using the semi-automated process PELLET, and was compared between locations, major vegetation types, and transect clusters. Deers were present in 98 % of the transects sampled, with a mean density of 4.2 ± 2.8 deers/km 2 . Higher densities were estimated in secondary vegetation and pasture-cropping sites. The 40 transects were grouped into four clusters according to the abundance of tree species. In addition, deer density varied between clusters. The density of the white-tailed deer was positively correlated with understory cover and negatively correlated with basal area. Deer density in Tantoyuca is within the range reported in other regions of the state of Veracruz. The use of generalized linear models enabled to predict the density of the white-tailed deer based on some vegetation variables. The localities studied differ in plant composition and structure, and the highest deer density was located in sites with a more diverse and dense plant composition and structure. It is suggested to undertake an in-depth investigation about the effect of landscape structural complexity and connectivity on this and other wildlife species.El venado cola blanca Odocoileus virginianus ha sido poco estudiado en el estado de Veracruz, México. En el presente trabajo se estimó la densidad poblacional de esta especie y se analizó su relación con la vegetación en un paisaje transformado en cinco localidades en municipio de Tantoyuca en el norte del estado. En cada localidad se colocaron 8 transectos (500 x 2 m) para el conteo del número de grupos fecales y la caracterización de la vegetación, y se muestrearon de abril a junio del 2014. Se emplearon análisis de agrupamiento jerárquicos de los transectos en función de similitud en la composición del estrato arbóreo, y modelos lineales generalizados para relacionar la densidad de venados con las variables vegetacionales. La densidad (venados/km 2 ) se estimó con el procedimiento semi-automatizado PELLET, y se comparó entre localidades, principales tipos de vegetación, y grupos de transectos. Los venados estuvieron presentes en el 98 % de los transectos y se estimó la densidad promedio de 4.2 ± 2.8 venados/km 2 . Las densidades más altas se estimaron en la vegetación secundaria con remanentes de selva baja y en las zonas de cultivos-pastizal. El área basal y la cobertura del sotobosque fueron las principales variables para predecir la densidad de este venado en la región de estudio...

Population Studies of Deer (Odocoileus virginianus, Mazama americana) in Southern Yucatán, Mexico

“…The population studies of deer in Mexico have been diverse [5,6,7], but it is little to characterize the population dynamics over several annual periods [8]. Some studies of population dynamics of deer have been carried out from simulation of population models in several countries [9,10], these studies are important when there is scarce data; however, they must be complemented with studies in situ to confirm the validity of the results generated by these models.…”