Publications

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immune response of lizards and rodents to larval ixodes scapularis (acari: ixodidae).the house mouse (laboratory strain), mus musculus (l.), the cotton mouse, peromyscus gossypinus (leconte), the broad-headed skink, eumeces laticeps (schneider), and the guinea pig, cavia porcellus (l.), were successively infested five times with larvae of the blacklegged tick, ixodes scapularis say. tick feeding success, engorgement weight, and subsequent molting success were measured after each infestation. a greater percentage of ticks (p less than 0.05) fed on m. musculus and e. laticeps than ...19921404256
conspecific odor detection by the male broad-headed skink, eumeces laticeps: effects of sex and site of odor source and of male reproductive condition.olfactory stimuli are sufficient for detection and discrimination of sex of conspecific lizards by the male broad-headed skink, eumeces laticeps, a member of a large group of lizards with pronounced chemosensory abilities, the autarchoglossa. the capacity of male broad-headed skinks to detect conspecific odors was assessed by measuring tongue extrusion rates in response to odor stimuli presented on moist cotton applicators. tongue-flick rates of postreproductive males were significantly higher f ...19846736892
effects of estrogen and male head coloration on chemosensory investigation of female cloacal pheromones by male broad-headed skinks (eumeces laticeps).indirect experimental evidence suggests that pheromone production and responsiveness to pheromones in a lizard, the broad-headed skink (eumeces laticeps), are regulated by sex steroid hormones. for study of estrogenic effects on female pheromone levels, tongue flicking by males was recorded in response to chemical samples from the female cloaca, the secretion site of the female sex pheromone. cloacal chemicals from estrogen-treated females elicited higher tongue flick rates by all males than sam ...19958623024
seasonal activity and host associations of ixodes scapularis (acari: ixodidae) in southeastern missouri.based on tick collections recovered from wild vertebrates and by dragging, the seasonal occurrence of adult blacklegged ticks, ixodes scapularis say, extended from october through may in southeastern missouri. adult activity was bimodal with the higher peak occurring in november followed by a lower peak in february. the activity of immature i. scapularis had the general pattern of that found in the northeast where lyme disease is hyperendemic, with larval activity (july) peaking after that of ny ...199910593072
parasitism of lizards by immature stages of the blacklegged tick, ixodes scapularis (acari, ixodidae).from 1982-1985 and 1993-1999, a total of 309 individual reptiles, mostly lizards and snakes, belonging to 12 species (american alligator, six lizard species, five snake species) was captured on st. catherine's island, liberty county, georgia, usa, and examined for ticks. three lizard species, the broad-headed skink eumeces laticeps, southeastern 5-lined skink eumeces inexpectatus, and eastern glass lizard ophisaurus ventralis, were severely infested with larvae and nymphs of the blacklegged tick ...200212537298
interspecific differences in metabolic rate and metabolic temperature sensitivity create distinct thermal ecological niches in lizards (plestiodon).three congeneric lizards from the southeastern united states (plestiodon fasciatus, p. inexpectatus, and p. laticeps) exhibit a unique nested distribution. all three skink species inhabit the us southeast, but two extend northward to central ohio (p. fasciatus and p. laticeps) and p. fasciatus extends well into canada. distinct interspecific differences in microhabitat selection and behavior are associated with the cooler temperatures of the more northern ranges. we hypothesized that interspecif ...201627760215
elevation in tongue-flick rate after biting prey in the broad-headed skink,eumeces laticeps.a postbite elevation in tongue-flicking (petf) rate occurs in adult male broad-headed skinks,eumeces laticeps. males having bitten neonatal mice showed significantly higher tongue-flicking rates in the 2 min following experimental removal of the prey than did males in several control conditions. in a second experiment designed to separate the effects of tactile and chemical stimulation of the oral cavity during biting, males tongue-flicked at significantly higher rates in response to swabs beari ...199224254949
induction of sexual receptivity in the female broad-headed skink, eumeces laticeps, by estradiol-17 beta.sexual receptivity in the female scincid lizard eumeces laticeps occurs naturally only during the spring breeding season, which is also when maximal follicular development occurs. the presumption that high estrogen levels are coincidentally present and the need for a reliable method of inducing sexual receptivity for behavioral studies prompted tests of the hypothesis that estrogen induces sexual behavior. a series of experiments established that estradiol-17 beta induces sexual behavior. a seri ...19863721415
deferred agonistic behavior in a long-lived scincid lizard eumeces laticeps : field and laboratory data on the roles of body size and residence in agonistic strategy.a laboratory experiment with the broad-headed skink (eumeces laticeps) involving staged agonistic encounters demonstrates that larger males have an advantage over smaller ones in agonistic bouts. field data on head wounds produced by intraspecific fighting during the breeding season show a much higher frequency of new wounds among males over 100 mm in snout-vent-length than in smaller males. the significant difference in new-wound frequency strongly suggests avoidance of fights by the small male ...198728311124
the sertoli cell membrane body in the skink.the structure of the sertoli cell and its physical relationship with the germ cells was studied in laboratory maintained skinks, eumeces laticeps (schneider) in january, and september, corresponding to the periods of prenuptial and postnuptial spermatogenesis respectively. light micrographs obtained using 1 micron thick plastic sections, show the sertoli cell to have a large polymorphic nucleus located in the basal portion of the cell, and a darkly staining juxtanuclear body. in ultrathin sectio ...19921589875
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