Citations Only: Recent submissions
Now showing items 621-640 of 990
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Response to simultaneous dehydration and thermal stress in three species of Puerto Rican frogs
(Springer: Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology, 1984-11)The response to simultaneous temperature and dehydration stress was examined in three species of Puerto Rican frogs. Eleutherodactylus antillensis is found primarily in hot, arid grasslands at low altitudes. Eleutherodactylus ... -
Post-metamorphic change in activity metabolism of anurans in relation to life history
(Springer: Oecologia, 1984-12)Newly-metamorphosed individuals of some species of frogs and toads differ from adults in behavior, ecology, and physiology. These differences may be related to broader patterns of the life histories of different species ... -
Energy costs of subduing and swallowing prey for a lizard
(The Ecological Society of America: Ecology, 1985-10)We measured the oxygen consumption (aerobic energy cost) and lactic acid production (anaerobic energy cost) of scincid lizards, Chalcides ocellatus, eating domestic crickets. Aerobic metabolism accounted for 90% or more ... -
The effect of rattlesnake venom on digestion of prey
(Elsevier: Toxicon, 1979)Rattlesnake venom injected into live mice before they were swallowed by non-venomous snakes speeded the process of digestion. This effect of venom was more pronounced when digestion was tested at 15°C than at 25°C. The ... -
Acid precipitation and reproductive success of ambystoma salamanders
(Springer: Water, Air and Soil Pollution, 1977-03): The two species of mole salamander that occur in the Ithaca, New York, region (Ambystoma maculatum and A. jeffersonianum) breed in temporary ponds that are formed by accumulation of melted snow and spring rains. Water ... -
Blood oxygen transport and delivery in reptiles
(Oxford University Press: American Zoologist, 1980)Cenozoic reptiles are characterized by physiological morphological and ecological systems with low energy requirements compared to those of mammals. Ectothermy and low resting rates of metabolism are the primary physiological ... -
Internal fertilization in an oviparous frog
(American Association for the Advancement of Science: Science, 1981-04)Eleutherodactylus coqui, an oviparous frog, undergoes internal fertilization. If this mode of fertilization occurs in other species of anurans, interpretations of anuran reproductive strategies based on the assumption of ... -
Ecological correlates of anuran exercise physiology
(Springer: Oecologia, 1982-01)Studies of exercise physiology of anuran amphibians have led to the suggestion that there is a dichotomy between species that depend upon movement to escape from predators and species that utilize static defenses. This ... -
Activity metabolism of the toad (Bufo americanus): Ecological consequences of ontogenetic change
(Springer: Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology, 1981-06)Following metamorphosis, juvenile toads form dense, heliothermic aggregations on the margins of the ponds from which they emerge. After a period of growth and development, during which body mass increases ten-fold, the ... -
Metabolic correlates of anuran behavior
(Oxford University Press: American Zoologist, 1985)Frogs exhibit extensive diversity in their repertoires of social, reproductive, defensive, and predatory behavior, and in the metabolic processes that support these activities. Three aspects of anuran biology (foraging ... -
Water balance of terrestrial anuran (Eleutherodactylus Coqui) eggs: importance of parental care
(The Ecological Society of America: Ecology, 1984-02)The terrestrial eggs of the coqui of Puerto Rico are brooded almost continuously by the male parent from the time of oviposition until the fully metamorphosed hatchlings emerge from the eggs 15-20 d later. The gelatinous ... -
Acid precipitation and embryonic mortality of spotted salamanders, Ambystoma maculatum
(American Association for the Advancement of Science: Science, 1976-04-02)Spotted salamanders breed in temporary pools formed in early spring by melted snow and rain. Many of these pools reflect the low pH of precipitation in the northeastern United States. Egg mortality is low (less than 1 ... -
Physiological basis of habitat partitioning in Jamaican Eleutherodactylus
(Springer: Oecologia, 1977-12)Rate of evaporation, resistance to drying, temperature selection, and critical thermal maximum were measured for Jamaican Eleutherodactylus acclimated to 20° C and a 12:12 L:D photoperiod. Two introduced species, E. ... -
Ontogenetic change in blood oxygen capacity and maximum activity in garter snakes (Thamnophis sirtalis)
(Springer: Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology, 1977-01)There is an ontogenetic increase in the time that garter snakes (Thamnophis s. sirtalis) can maintain maximum activity at 25°C. Newborn snakes are exhausted by 3–5 min of activity while adults can be active for 20–25 min. ... -
Mimicry of vertebrates: are the rules different?
(University of Chicago Press: American Naturalist, 1988-06)Examples of mimicry among vertebrates are numerically fewer than examples involving insects. The relatively small number of species of vertebrates, compared with the number of species of insects, probably explains some of ... -
The ecological cost of morphological specialization: feeding by a fossorial lizard
(Springer: Oecologia, 1987-08)Head size and shape of reptiles may reflect selection for multiple uses. For example, sexual selection for large head size may enhance feeding efficiency. In contrast, morphological characteristics of the heads of fossorial ... -
Diploid and tetraploid grey treefrogs (Hyla chrysoscelis and Hyla versicolor) have similar metabolic rates
(Elsevier: Comparative Biology and Physiology A, 1985)We measured oxygen consumption of the diploid frog Hyla chrysoscelis and its recently evolved tetraploid cryptic species Hyla versicolor at rest and during forced locomotory exercise. We also measured whole-body lactic ... -
Ontogenetic change in molecular and functional properties of blood of garter snakes, Thamnophis sirtalis
(Wiley: Journal of Experimental Zoology, 1977-07)At birth the blood of garter snakes (Thamnophis sirtalis) has high oxygen affinity (P50 at 25°C and pH 7.2 = 21 mm Hg), low hematocrit (14%), and a high proportion of inactive hemoglobin (44%). Growth of the snakes is ... -
Population density of tropical forest frogs: relation to retreat sites
(American Association for the Advancement of Science: Science, 1983)The forest frog Eleutherodactylus coqui defends specific sites for retreats and nests in the Luquillo Forest, Puerto Rico. The hypothesis that shortages of nest and retreat sites limit population size was tested by placing ... -
The Advantages of ectothermy for tetrapods
(University of Chicago Press: American Naturalist, 1980-01)The way of life of amphibians and reptiles, in contrast to that of birds and mammals, is based on low energy flow. Many of the morphological and physiological characteristics of ectothermal tetrapods that are normally ...