Actividad del lagarto verdinegro (Lacerta schreiberi) (Sauria: Lacertidae)

Milla, Alfredo Salvador

doi:10.14198/mdtrra1987.9.04

Cited by 5 publications

(5 citation statements)

References 4 publications

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“…Previous studies indicate that activity body temperatures recorded in the field generally match preferred temperatures measured in the laboratory in diurnal lizards (Huey 1982). Field-active body temperatures are available for a subset of the species studied (Salvador and Arguello 1987;Van Damme et al 1987Brafia 1991;Castilla and Bauwens 1991;Gil 1992). Although these studies differ in methodology, scope, and study periods, they indicate that the distributions of field active body temperatures closely resemble those of the preferred temperatures, except in some high altitude and high latitude populations at the onset of the activity period (cf.…”

mentioning

confidence: 99%

Evolution of Sprint Speed in Lacertid Lizards: Morphological, Physiological, and Behavioral Covariation

Bauwens¹,

et al. 1995

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Organismal performance abilities occupy a central position in phenotypic evolution; they are determined by suites of interacting lower-level traits (e.g., morphology and physiology) and they are a primary focus of natural selection. The mechanisms by which higher levels of organismal performance are achieved during evolution are therefore fundamentally important for understanding correlated evolution in general and coadaptation in particular. Here we address correlated evolution of morphological, physiological, and behavioral characteristics that influence interspecific variation in sprint speed in a clade of lacertid lizards. Phylogenetic analyses using independent contrasts indicate that the evolution of high maximum sprinting abilities (measured on a photocell-timed racetrack) has occurred via the evolution of (1) longer hind limbs relative to body size, and (2) a higher physiologically optimum temperature for sprinting. For ectotherms, which experience variable body temperatures while active, sprinting abilities in nature depend on both maximum capacities and relative performance levels (i.e., percent of maximum) that can be attained. With respect to temperature effects, relative performance levels are determined by the interaction between thermal physiology and thermoregulatory behavior. Among the 13 species or subspecies of lizards in the present study, differences in the optimal temperature for sprinting (body temperature at which lizards run fastest) closely matched interspecific variation in median preferred body temperature (measured in a laboratory photothermal gradient), indicating correlated evolution of thermal physiology and thermal preferences. Variability of the preferred body temperatures maintained by each species is, across species, negatively correlated with the thermal-performance breadth (range of body temperatures over which lizards can run relatively fast). This pattern leads to interspecific differences in the levels of relative sprint speed that lizards are predicted to attain while active at their preferred temperatures. The highest levels of predicted relative performance are achieved by species that combine a narrow, precise distribution of preferred temperatures with the ability to sprint at near-maximum speeds over a wide range of body temperatures. The observed among-species differences in predicted relative speed were positively correlated with the interspecific variation in maximum sprinting capacities. Thus, species that attain the highest maximum speeds are (1) also able to run at near-maximum levels over a wide range of temperatures and (2) also maintain body temperatures within a narrow zone near the optimal temperature for sprinting. The observed pattern of correlated evolution therefore has involved traits at distinct levels of biological organization, that is, morphology, physiology, and behavior; and trade-offs are not evident. We hypothesize that this particular trait combination has evolved in response to coadaptational selection pressures. We also discuss our results ...

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confidence: 99%

Evolution of Sprint Speed in Lacertid Lizards: Morphological, Physiological, and Behavioral Covariation

Bauwens¹,

et al. 1995

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“…Body temperature (T b ) of lizards before hiding or immediately after emergence could not be measured with reliability given the experimental design. Field studies show that average T b of L. schreiberi is 31 • C, which is about 10 • C above air temperature (Salvador & Argüello, 1987). In a thermal gradient in the laboratory this lizard has a selected T b of 36.5 • C (Bauwens et al, 1995).…”

Section: Methodsmentioning

confidence: 93%

“…Our results indicated that the thermal environment at the point where the lizard was before the attack (T ext ), the thermal conditions inside the refuge (T int ) and the body mass of the lizard affected its refuge use decisions. On the one hand, lizards with presumably higher initial body temperatures (T b ) (i.e., higher T ext ; see Salvador & Argüello, 1987) and with a greater body mass (i.e., slower cooling rates) could hide for longer in the refuge. This is explained because these lizards could spend a longer time at low refuge temperatures before reaching a 'critical' low body temperature.…”

Section: Discussionmentioning

confidence: 99%

Thermal constraints of refuge use by Schreiber's green lizards, Lacerta schreiberi

López

Martı́n

2010

Behav

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Prey should balance cost and benefits when deciding optimal refuge use. In ectotherms, such as lizards, body temperature can decrease in cold refuges, which has negative effects on physiological and locomotor performance. Thus, refuge use of ectotherms should be influenced by the thermal environment as well as by the body size-dependent thermal inertia of each individual. We simulated predator attacks to Schreiber's Green lizards (Lacerta schreiberi) and analyzed their refuge use. Results indicated that temperatures outside and inside a refuge had opposite effects on refuge use decisions. Thus, when initial external temperatures were higher and lizards had higher thermal inertia, lizards could spend longer times inside refuges before reaching a 'critical' low body temperature. However, when refuge temperature was low lizards did not decrease refuge use. If low refuge temperatures increased risk upon emerging because lizards had lower escape performance, lizards would need to compensate by remaining in a refuge for longer to scan the surroundings before emerging to ensure that the risk of a new attack decreased. Therefore, when deciding refuge use, L. schreiberi lizards seem to consider physiological costs of being at low temperatures and also the risk of emerging with low escape performance.

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“…Efectivamente, los jóvenes de L. schreiberi basan su dieta en las tallas de presa mds abundantes, al igual que hacen los j6venes de L. vivipara (Heulin, 1986). En j6venes las demandas de energfa deben ser relativamente bajas (Stamps et al, 1981 ), dado que su actividad es muy escasa (Salvador, 1988 b). Para ellos parece ser mis rentable capturar las presas mAs abundantes.…”

Section: Categorias Taxon6micasunclassified

Disponibilidad y uso de recursos tróficos por Lacerta schreiberi y Podarcis bocagei en simpatría en una localidad de la Cordillera Cantábrica, España

Salvador

Domínguez

1990

Amphib Reptilia

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Food availability and diet composition were examined in sympatric populations of Lacerta schreiberi and Podarcis bocagei at a locality in the Cantabrian mountains (province of León, Spain). Neither species uses trophic resources in proportion to their relative abundance. Extensive overlap in diet composition has been found between P. bocagei and juvenile L. schreiberi. Although both species feed mainly on spiders, juvenile L. schreiberi eat the most abundant and P. bocagei select larger prey sizes. Subadult and adult L. schreiberi select beetles and grasshoppers.

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Actividad del lagarto verdinegro (Lacerta schreiberi) (Sauria: Lacertidae)

Cited by 5 publications

References 4 publications

Evolution of Sprint Speed in Lacertid Lizards: Morphological, Physiological, and Behavioral Covariation

Evolution of Sprint Speed in Lacertid Lizards: Morphological, Physiological, and Behavioral Covariation

Thermal constraints of refuge use by Schreiber's green lizards, Lacerta schreiberi

Disponibilidad y uso de recursos tróficos por Lacerta schreiberi y Podarcis bocagei en simpatría en una localidad de la Cordillera Cantábrica, España

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