A5081702429- Amphibian and Reptile Biology
- Animal Behavior and Reproduction
- Species Distribution and Climate Change
- Plant and animal studies
- Physiological and biochemical adaptations
- Bat Biology and Ecology Studies
- Animal and Plant Science Education
- Insect and Arachnid Ecology and Behavior
- Ecology and Vegetation Dynamics Studies
- High Altitude and Hypoxia
- Wildlife Ecology and Conservation
- Parasite Biology and Host Interactions
- Forest Ecology and Biodiversity Studies
- Rangeland and Wildlife Management
- Viral Infections and Vectors
- Genetic diversity and population structure
- Orthoptera Research and Taxonomy
- Ion channel regulation and function
- Turtle Biology and Conservation
- Neuroendocrine regulation and behavior
- Rabies epidemiology and control
- Venomous Animal Envenomation and Studies
SUNY Oneonta
2017-2024
State University of New York
2017
University of Minnesota
2013-2015
University of California, Santa Cruz
2010-2014
It is predicted that climate change will cause species extinctions and distributional shifts in coming decades, but data to validate these predictions are relatively scarce. Here, we compare recent historical surveys for 48 Mexican lizard at 200 sites. Since 1975, 12% of local populations have gone extinct. We verified physiological models extinction risk with observed extended projections worldwide. estimate 4% extinct worldwide, by 2080 projected reach 39% may 20%. Global were validated...
Natural populations respond to selection pressures like increasing local temperatures in many ways, including plasticity and adaptation. To predict the response of ectotherms lizards temperature increase, it is essential estimate phenotypic variation determine heritability temperature-related traits average field body (T b) preferred p). We measured T p Uta stansburiana a laboratory thermal gradient assessed contribution sex, reproductive status throat color genotype b adult lizards. Females...
We describe discrete variation in throat color, an important sexual signal, males of 2 populations the mesquite lizard (Sceloporus grammicus). At one locality, exhibit orange, yellow, and blue morphs; whereas at other, white morphs. performed dyadic agonistic behavior trials both found that color is associated with aggression level. However, association between not same these populations. The also consistent some associations documented closely related species variable color. Our findings...
Color polymorphic sexual signals are often associated with alternative reproductive behaviors within populations, and the number, frequency, or type of morphs present vary among populations. When these differences lead to assortative mating by population, study such taxa may shed light on speciation mechanisms. We studied two populations a lizard throat color, an important signal. Males in one population exhibit orange, yellow, blue throats; whereas males other white throats. assessed female...
The thermal requirements of ectotherms may vary among species due to adaptation different environments. Nevertheless, some these are evolutionarily conserved, leading organisms compensate behaviorally for harsh environmental conditions. High-mountain systems provide temperature gradients that allow studies evolutionary and plastic variation in ecology under natural We evaluated the thermoregulation strategies Sceloporus grammicus Wiegmann, 1828 at three points (2600, 3100, 4150 m above sea...
High-altitude organisms exhibit hematological adaptations to augment blood transport of oxygen. One common mechanism is through increased values traits such as erythrocyte count, hematocrit, and hemoglobin concentration. However, a positive relationship between altitude not observed in all high-altitude systems. To understand how adapt high altitudes, it important document physiological patterns related hypoxia gradients from greater variety species. Here, we present an extensive description...
Abstract Body temperature is important in determining individual performance ectotherms such as lizards. Environmental decreases with increasing altitude, but nevertheless many lizards inhabit high-altitude environments. The ‘thermal melanism hypothesis’ proposes that a dark dorsal coloration enables darker individuals to heat up faster because they absorb more solar radiation and thus being may be advantageous cold habitats. aim of the present study evaluate how heating rate, cooling rate...
Abstract Urbanization is a global phenomenon that involves the transformation of natural areas into urban spaces, thereby subjecting organisms to new selective pressures including wide variety pollutants and changes in intra‐ interspecific interactions. Considering projections indicate by year 2050, 65% human population will live urbanization with an upward pattern, identifying these phenotypic traits vital implementing conservation management plans for fauna. The environment may exert...
Snake venom may vary in composition and toxicity across the geographic distribution of a species. In case three species Neotropical rattlesnakes Crotalus simus, C. culminatus tzabcan recent research has revealed that their venoms can contain neurotoxic component (crotoxin homologs), but is not always case. present work, we detected quantified crotoxin homologs samples from distributed Mexico, to describe variation at individual subspecific levels, using slot blot ELISA immunoassays. We found...
Characterizing the population density of species is a central interest in ecology. Eastern North America global hotspot for biodiversity plethodontid salamanders, an inconspicuous component terrestrial vertebrate communities, and among most widespread eastern red-backed salamander, Plethodon cinereus . Previous work suggests densities are high with significant geographic variation, but comparisons locations challenged by lack standardization methods failure to accommodate imperfect...
Life-history theory is based on the idea that trade-offs exist in allocation of resources. The same energy cannot simultaneously fuel growth and reproduction or increase size number offspring. Many genetic, physiological, environmental variables influence how manifest whether they are detectable through phenotypic correlations. In most squamates, absence parental care enables estimation reproductive investment using mass This, as well their diverse ecologies, makes squamates an attractive...
Heloderma horridum is one of the few known venomous lizards in world. Their populations are decline due to habitat destruction and capture for pet trade. In México, many zoos have decided take care this species, most them at altitudes greater than natural altitudinal distribution. However, we know little about capacity reptiles face high-altitude environments. The objective study was compare hematological traits H. captivity high low altitude Our findings show that does not respond hypoxic...
Abstract Phenotypic plasticity is nearly universal among organisms, and evidence indicates that can exhibit additive genetic variation respond to selection. These findings have important implications for our understanding of how may be constrained its mechanistic structure affect evolution. Many life history trade-offs conceptualized as plastic traits, with individuals varying in their position along trade-off axes due differences, developmental plasticity, or short-term occurring throughout...
Vertebrates exhibit structural changes in their cardiovascular and gas exchange systems response to hypoxic conditions high altitude environments. In highland neotenic mole salamanders, as other amphibians, the majority of gases is carried out for skin gills. But, environments, available oxygen lower than it air thus, scarcity limits survival organisms. Many studies on this subject have focused understanding hematological mechanisms that amphibians hypoxia. However, little known about...