Identifying factors that may be responsible for regulating the size of animal populations is a cornerstone in understanding population ecology. The main are thought to influence either resources (bottom‐up), or predation (top‐down), interspecific competition (parallel). However, there highly variable and often contradictory results regarding their relative strengths influence. These varied interpreted as indicating “shifting control” among three factors, complex, nonlinear relationship...

Abstract Aim Coyote ( Canis latrans ) distribution in Mexico and Central America has expanded recently reaching the Yucatan peninsula, Belize Panama, probably promoted by deforestation of tropical areas. Historically, southern coyotes prior to European settlement was described as only far south central that introduction livestock favoured migration America. However, coyote fossil records Yucatan, well observational travellers during sixteenth century suggest coyote's arrival region earlier....

We studied the food habits of coyote (Canis latrans) in a tropical deciduous forest along Mexican Pacific coast during 1996 and 1997. Small mammals, chiefly Jaliscan cotton rat (Sigmodon mascotensis), were main prey items dry season. Cultivated fruits, like mango papaya, most important for coyotes wet Given importance our study area human related rat, we expect expansion populations due to deforestation forest.

Abstract The effect of an open landfill and the seasonality a tropical deciduous forest in Jalisco, Mexico, was tested on home range group size coyotes Canis latrans under Resource Dispersion Hypothesis (RDH), which proposes that social carnivores dispersion patches limited resources determines home‐range size, whereas independently, abundance affects size. predictions this study were using landfill, where food is available all year due to continuous arrival wastes are concentrated single...

Numerous studies have been made of rodent population and community dynamics, especially in arid ecosystems. Most centered on understanding how total species-specific densities rodents change over time. The standing biomass each species contributes also is important to the energy available mesocarnivore community. Although density are related, they might differ if those differences importance structure function not received much attention. We analyzed 12 years body mass data from Chihuahuan...

Abstract The volcano rabbit Romerolagus diazi is endemic to the mountains of central Mexico, where its habitat has been gradually destroyed make way for agriculture, ranching and logging, by forest fires. categorized as Endangered on IUCN Red List. We evaluated relationship between abundance vegetation structure at a small scale (0.25 ha). Using general linear model we generated set 21 predictive models proposed best quality index. Our results suggest that greater height cover bunchgrasses...

Context The processes of fragmentation, habitat loss, degradation and their combined effects are formidable threats to amphibian populations. Aims We evaluate the effect three land use-type variables nine landscape matrix quality factors on presence in four coffee agro-ecosystems two cloud-forest fragments central Veracruz, Mexico. Methods Each site was thoroughly searched using visual-encounter survey technique along different trails most feasible microhabitats for detecting amphibians...

Abstract The diet and pattern of food resource use by the pygmy skunk Spilogale pygmaea , an endemic threatened species western Mexico, was evaluated in tropical dry forest Chamela, Jalisco. Analysis scats ( n = 104) stomach contents 5) obtained during 1997, 1998 2000 showed that skunks fed mainly on invertebrates. Insect larvae constituted most represented item samples. During 2000, quantified comparing occurrence available prey with items found scats. Even though seem to be opportunistic...

We studied the diet and foraging behavior of bobcats (Lynx rufus) in Chihuahuan Desert, Mexico, from 2005–2007 to test if will select energetically profitable prey, regardless their relative abundance. estimated frequency occurrence percentage for species prey through analysis scats (n = 117) evaluated selection by comparing availability against consumption, based on biomass number consumed as represented scats. Bobcats a wide variety but rodents lagomorphs dominated diet. Species were not...

Coyotes are one of the most intensively studied carnivores world. However, information on coyote ecology has been obtained from individuals living within northern portion their distribution. In southern range (Mexico and Central America), home ranges (e.g., Hernandez et al. 1993, Servin Huxley 1995) food habits 1994, Sanabria 1996) have in temperate areas or subtropical deserts scrublands. tropical areas, about coyotes is limited to diet analyses (Vaughan Rodriguez 1986, HidalgoMihart 2001),...

In this study we determined and compared coyote diet within out of the Mapimí Biosphere Reserve.We collected 201 scats, 62 in dry season 139 rainy from March 2000 to 2001.Samples were analyzed for general area by sites. We identified 50 45 items season,respectively. Out 299 894 season, more frequent itemswere arthropods, mainly Acrididae, Cicadellidae, Coleoptera Lepidoptera; mammals, Lepus californicusand Sylvilagus audubonii. Plant material, reptiles birds less frequently consumed items....

Abstract Daily activity is an important aspect of animal behavior and depends both on nutritional reproductive demands. It also can be modified by—among other factors—interspecific competition, the need to minimize risk predation, human disturbance, such as presence cattle. We studied patterns degree overlap among carnivores, their potential wild prey, livestock, in a Biosphere Reserve Chihuahuan Desert. There was no temporal segregation carnivores. Carnivores synchronized with that main...

Understanding the response of species to land-use change is necessary for improvement management and conservation policies. We assessed impact vegetation cover on Morelet's crocodile populations in nine wetlands located central Veracruz, Mexico, test hypothesis that higher forest lower anthropogenic increases density. correlated relative density crocodiles with wetland attributes, including depth, pH, salinity, richness structure bordering vegetation; disturbance factors, proportion modified...

Endemic to the central mountains of Trans-Mexican Volcanic Belt, volcano rabbit (Romerolagus diazi), known locally as zacatuche, is a threatened species at risk extinction. In Ajusco-Chichinautzin Mountain Range, Pelado and Tlaloc volcanoes are core distribution areas for this species; however, suitable habitat within these patchy. We analyzed landscape level, taking into account biotic, abiotic, anthropogenic factors. used geographic information systems analysis linear mixed-effects model...

Los cafetales son agrosistemas de gran importancia biológica y económica a nivel nacional e internacional, forman parte los principales cultivos en el centro Veracruz, que muchos casos han sustituido al bosque mesófilo montaña, no obstante, capaces mantener la biodiversidad original región. Para analizar relación entre patrones diversidad alfa, beta gamma mamíferos medianos, heterogeneidad espacial café con distinto grado manejo, se registraron rastros, utilizaron cámaras fotográficas...

The current distribution of the endemic Perote ground squirrel (Xerospermophilus perotensis) and its future potential response to climate change have not been addressed. Thus, in this work, we focus on both aspects species by means ecological niche modeling, using different general circulation models Intergovernmental Panel Climate Change emission scenarios. Because species’ life history includes a hibernation period, performed two sets analysis: one considering whole annual cycle another...

Introduction: Photographic records are useful tools that had strengthen wildlife mammal studies as a noninvasive methodology providing wide variety of information. The objective this study is to document with images (automatic - trail cameras and manually – personal cameras) the species mammals inhabiting Mapimi Biospere Reserve (MBR), highlight morphologic characteristics distinguish them, record area vegetation type where each was found determine some their daily activities. Methods:...

ABSTRACT Dry season den use by the pygmy spotted skunk Spilogale pygmaea , an endemic and threatened species of western Mexico, was evaluated at micro macrohabitat level, in tropical deciduous forest Chamela, Jalisco, Mexico. During dry seasons 1997, 1998, 2000, 79 sites (29 for females 50 males) were located using Radiotelemetry. Dens underground excavations with one to five access points, mostly on open ground or under live dead trees. Skunks exhibited a continued reuse dens but evidence...

Este estudio evalúa la influencia del tipo de carretera y infraestructura (obras drenaje) sobre el número vertebrados atropellados en Xalapa – Puebla (tramo: Banderilla Amozoc) zona central montañosa Estado Veracruz. El se realizó tres diferentes tipos (que varían acuerdo al carriles estructura que los separa) cuales seleccionaron sitios donde existiera una obra drenaje considerada como paso potencial para fauna. En cada uno contó individuos relacionó con presencia ausencia obras drenaje,...