Author: Steven Norman TrautweinPublisher:
ISBN:
Category :
Languages : en
Pages : 760
Book Description
Relationships Among Behavior, Body Temperature, Physiological State and Habitat Utilization in the Northern Fence Lizard Sceloporus Undulatus Hyacinthinus
Author: Steven Norman TrautweinPublisher:
ISBN:
Category :
Languages : en
Pages : 760
Book Description
Wildlife Review
Author: Publisher:
ISBN:
Category : Wildlife conservation
Languages : en
Pages : 554
Book Description
Comprehensive Dissertation Index
Author: Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 752
Book Description
Dissertation Abstracts International
Author: Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 652
Book Description
American Doctoral Dissertations
Author: Publisher:
ISBN:
Category : Dissertation abstracts
Languages : en
Pages : 696
Book Description
The Zoological Record
Author: Transactions of the Missouri Academy of Science
Author: Missouri Academy of SciencePublisher:
ISBN:
Category : Science
Languages : en
Pages : 580
Book Description
How Do Lizards Use Behavior and Physiology to Inhabit Different Climate Zones?
Author: Matthew R. McTernanPublisher:
ISBN:
Category : Body temperature
Languages : en
Pages : 172
Book Description
Rapid climatic change is expected to pose extreme ecological and physiological challenges on many ectothermic vertebrates. Some ectothermic species are notable, however, for inhabiting wide geographic ranges and variety of climate zones. Studying how exemplars among ectotherms can behaviorally and physiologically accommodate differing temperature ranges should provide useful mechanistic perspectives on climate change challenges for less accomplished ectotherms. The western fence lizard (Sceloporus occidentalis) is one such exemplar, ranging from southern California to northern Washington. In Washington State, a single subspecies of this lizard occupies strongly contrasting climate zones. Thus, the focus of this thesis was to determine how this subspecies uses behavior and physiology to successfully inhabit these very different habitats within these climate zones. I chose to study Sceloporus occidentalis populations from the Sondino Ponds Unit in the Columbia River Gorge ("CRG"; mean max air = 38.9°C), Goat Wall in the North Cascades ("GW"; mean max air = 33°C), and along the coastal shores of the Salish Sea just north of Marysville ("CS"; mean max air = 27.7°C). In summer 2015 and 2016, to compare thermoregulatory capacity in the field among lizards at each of these contrasting climate zones, I measured field-active body temperatures (field-active Tb) of lizards immediately upon capture. To determine whether lizards may have needed to accept field-active Tb that were suboptimal -- presumably due to suboptimal thermal conditions -- I compared the distribution of a) field-active Tb among the three locales, and b) field-active Tb with preferred v body temperatures of alert-and-active lizards in the lab (lab Tb) where they were free to select precise body temperatures in a thermal gradient. To test for presence of temperature-dependent physiological differences among the three populations of lizards, I used a flow-through respirometry system in lab to measure whole-animal resting metabolic rates (RMR) -- lizards with digesting and assimilating food in their guts -- at three ecologically and physiologically relevant body temperatures (20°C, 28°C, and 36°C), as well as standard metabolic rates (SMR) -- lizards that were fasted and empty of foodstuff -- at 28°C Tb. Lizards at the warmest locale, CRG, had significantly higher field-active Tb than those at the cool coastal locale, CS (ANOVA, p=0.05; post hoc, p=0.045), but field-active Tb of lizards at the high-elevation, northern population, GW, were not significantly different from those of lizards at the other two locales. The distribution of field-active Tb of lizards from CRG skewed warmer than lab Tb (t-tests comparing upper quartile, p
Behavioral Responses to Thermal Variation in a Color Polymorphic Lizard
Author: Tyler GoergePublisher:
ISBN:
Category : Lizards
Languages : en
Pages : 0
Book Description
Climate change is creating novel thermal environments worldwide. The alteration of thermal niches is especially challenging for ectotherms due to their reliance on body temperature for nearly all aspects of organismal performance. Characterizing the relationships between performance and temperature is therefore critical in predicting how ectotherm species and populations will persist in rapidly changing and challenging environments. To do so, scientists often characterize thermal traits with respect to aspects of physiological performance. In challenging environments, organisms will use behavioral adjustments to either enhance heating or avoid overheating. Behavior also influences many critical aspects of ecology and ultimately fitness. However, despite its ecological relevance and underlying physiological basis, behavior has largely been ignored in analyses pertaining to altered thermal niches. This dissertation explores multiple relationships between temperature and behavior in the ornate tree lizard, Urosaurus ornatus. As different species cope with novel thermal environments, elucidating the nature of these relationships will provide insight into how species may navigate altered thermal niches from both behavioral and physiological perspectives. First, I investigate the thermal sensitivity of push-up display rate, a social communication behavior utilized by U. ornatus. Display rate is influenced by an interaction between body temperature and microhabitat use, where body temperature influences display rate in different directions and magnitudes depending on the microhabitat from which the lizard displays from. Second, I quantify how thermoregulatory behavior is influenced by the presence of conspecifics. Social interactions with individuals of multiple sexes and color morphs result in individual lizards adjusting their selected body temperatures to varying degrees. Third, I assess covariation of behavioral and thermal preference traits between color morphs. Dominant male morphs are bolder, more exploratory, and prefer higher body temperatures than subordinate morphs, which helps explain habitat use variation observed between the two groups. Last, I quantify the influence of heat stress on boldness behavior. When lizards undergo a heat hardening response, a cellular mechanism that temporarily increases thermal tolerance in response to unfavorable environmental conditions, they also increase boldness expression, which could influence the adaptive potential of heat hardening as a response to heat stress. Together, this dissertation documents a suite of behavioral traits that mediate how a model species interacts with its environment. Assessing relationships between these phenotypes and temperature provides novel insight into how rising temperatures and altered thermal niches attributed to climate change may influence behavioral expression, social structure, and survival.
The Effects of Aggressive Display on Body Temperature in the Fence Lizard Sceloporus Occidentalis Occidentalis Baird and Girard
Author: Gustav A. EngbretsonPublisher:
ISBN:
Category : Lizards
Languages : en
Pages : 23
Book Description