We orally inoculated Rana catesbeiana tadpoles (n=23) and metamorphs (n=24) to test their suitability as hosts for Escherichia coli O157:H7. Tadpoles were housed in flowthrough aquaria and did not become infected. Metamorphs were housed in stagnant aquaria, and 54% tested positive through 14 days postinoculation, suggesting that they are suitable hosts for E. coli O157:H7.

Abstract Animals with biphasic lifecycles often inhabit different visual environments across ontogeny. Many frogs and toads (Amphibia: Anura) have free-living aquatic larvae (tadpoles) that metamorphose into adults a range of terrestrial environments. Ecological differences influence eye size species, but these relationships not yet been explored life stages in an ontogenetic allometric context...

Studies on life cycles and epizootiology of North American frog bladder flukes indicate that adult frogs become infected predominantly by ingesting tadpoles or other frogs that serve as second intermediate hosts for gorgoderid metacercariae. Other studies have indicated that newly metamorphosed frogs are rarely infected with these parasites because they are gape-limited predators that cannot fe...

Animals may overcome the challenges of temperature instability through behavioural and physiological mechanisms in response to short- and long-term temperature changes. When ectotherms face the challenge of large diel temperature fluctuations, one strategy may be to reduce the thermal sensitivity of key traits in order to maintain performance across the range of temperatures experienced. Additi...

Many animals respond to predation risk by altering their morphology, behavior, or life-history. We know a great deal about the cues prey respond to and the changes to prey that can be induced by predation risk, but less is known about how plastic responses to predators may be affected by separate plastic responses occurring earlier in life, particularly during the embryonic period. Embryos of a...

Declining wetland areas cause many amphibian species to breed inside stormwater ponds (SWPs), which have been constructed alongside major roads collect and retain polluted road runoff water. However, the suitability of such artificial as a breeding habitat for amphibians remains unclear. Recently, study found very low survival rate European green toad tadpoles (Bufotes viridis) SWPs, presumably...

A bstract The tadpole conjecture proposes that complex structure moduli stabilisation by fluxes have low charge can be realised only at special points in space, leading generically to (large) gauge symmetries. Here we provide an exhaustive survey of the symmetries arising F-theory flux compactifications on products attractive K3 surfaces, with fully stabilised. We compute minimal rank left-over...

A characteristic feature of the obligatory control of amphibian metamorphosis by thyroid hormones is the early acquisition of response of tadpole tissues to these hormones well before the latter are secreted, with 'exponentially' increasing hormonal sensitivity upon the onset of metamorphosis. We have therefore analyzed the expression of the two thyroid hormone receptor genes (TR alpha and beta...

Habitat selection has long been a central theme in ecology and historically considered both physiological responses ecological factors affecting species establishment. Investigating habitat patterns at different scales can provide important information on the relative roles of environmental influencing organisms’ abilities to use their surrounding habitat. This work aimed investigating which de...