Effects of arginine vasotocin on water balance of three leiopelmatid frogs

Cree, Alison

doi:10.1016/0016-6480(88)90156-6

Cited by 21 publications

(7 citation statements)

References 33 publications

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“…comm.). In addition, this frog species has high moisture requirements (Cree 1988). Our results show that frog-occupied sites had slightly higher relative humidity than unoccupied sites (64.8 and 61.4%, respectively).…”

Section: Relationship Between Frog Distribution and Environmental Chamentioning

confidence: 59%

Habitat-use model for the New Zealand endemic frog Leiopelma hochstetteri

Nájera-Hillman

O’Shea

Breen

et al. 2009

Endang. Species. Res.

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Leiopelma hochstetteri is the most widespread and abundant endemic frog species in New Zealand, although it now survives only in spatially fragmented populations throughout the North Island of New Zealand and the Great Barrier Island of northeastern New Zealand. The species is known to occur in wet areas adjacent to shaded streams in forested catchments; however, no quantitative ecological data exist to enable characterisation of its habitat. In the present study, novel data on the current distribution and habitat requirements of this species are reported for 1 population in the Waitakere Ranges, northwestern New Zealand, which is considered as a conservation management unit for the species. Frogs were found within most streams surveyed (68.2%). Statistical modelling demonstrates that frogs most likely occur in small, erosive streams with coarse substrates and cold waters, surrounded by mature or undisturbed riparian vegetation. Anthropogenic activities such as clearing or logging are identified as threats to this frog species.

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Section: Relationship Between Frog Distribution and Environmental Chamentioning

confidence: 59%

Habitat-use model for the New Zealand endemic frog Leiopelma hochstetteri

Nájera-Hillman

O’Shea

Breen

et al. 2009

Endang. Species. Res.

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“…AVT exerts diuretic effects through enhancing renal tubular water reabsorption and decreasing glomerular filtration rate in anurans (Cree, 1988;Sawyer and Pang, 1975). We previously reported that the mesonephros became functional a t stage 48 in the larvae of Xenopus laevis when OT-and AVP-positive fibers first appeared in the median eminence, although the pronephros was already functional a t stage 37/38 (Tahara et al, 1993).…”

Section: Ot and A Vp Lmmunoreactivitymentioning

confidence: 96%

Immunohistochemical studies on the development of the hypothalamo‐hyophysial system in Xenopus laevis

1995

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These results suggest the following three chronological steps in the development of hypothalamo-hypophysial systems and their target organs: independent development of target organs at early developmental stages; appearance of hypophysial hormones to control the development of target organs at middle developmental stages; appearance of hypothalamic hormones to control the function or maturation of the hypophysis at late developmental stages.

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“…Currently, there are no data available on the plasma AVT response to water contact after dehydration for terrestrial or desert species. However, the results of in vitro and injection studies indicate that cutaneous responses to AVF treatment vary with the type of environment inhabited by the species; terrestrial species increase cutaneous permeability in response to AVT (Bakker and Bradshaw 1977), while this response is reduced or completely absent in semiaquatic and aquatic species (Bentley 1969a;Cree 1988). There is also evidence that cutaneous responsiveness can vary within species as a function of water balance status and environmental conditions.…”

Section: Introductionmentioning

confidence: 98%

“…Arginine vasotocin (AVT) is thought to be the primary amphibian antidiuretic hormone (Bentley 2002). In amphibians, AVT has been shown to increase skin and bladder permeability as well as reducing urine output (Bentley 1969(i;McClanahan and Baldwin 1969;Baldwin 1974;Yorio and Bentley 1977;Eggena 1987;Cree 1988). Cocooning frogs make a particularly interesting case for the study of AVT because its normal role in regulating cutaneous permeability is nullified by the presence of the cocoon.…”

Section: Introductionmentioning

confidence: 98%

Water Balance and Arginine Vasotocin in the Cocooning FrogCyclorana platycephala(Hylidae)

Cartledge

Withers

Bradshaw

2008

Physiological and Biochemical Zoology

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It is well established that forming a cocoon, for frog species capable of doing so, markedly reduces evaporative water loss; however, the capacity of cocooned frogs to maintain hydration during extended estivation is not well understood. The combined effects of long-term estivation and water loss were examined in the cocoon-forming species Cyclorana platycephala by assessing the hydration state of the frogs throughout a 15-mo estivation period. Frogs lost mass throughout the 15-mo period to a maximum of 36%+/-6.5% of their initial standard mass. Plasma osmolality reached maximal levels by the ninth month of estivation at 487 mOsm kg(-1) and then remained stable to the fifteenth month of estivation. Urine osmolality continued to increase to the fifteenth month of estivation, at which point plasma and urine concentrations were isosmotic. The use of bladder water to counter losses from circulation was indicated by the relatively slow rate of increase in plasma osmolality with mass loss and the progressive increase in urine osmolality. For estivating frogs, evidence was found for a possible threshold relationship between plasma osmolality and plasma arginine vasotocin (AVT) concentration. After estivation, plasma AVT concentrations decreased markedly after 15-mo estivators were placed in water for 2 h, suggesting that high levels of AVT may not be integral to rapid rehydration in this species.

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Effects of arginine vasotocin on water balance of three leiopelmatid frogs

Cited by 21 publications

References 33 publications

Habitat-use model for the New Zealand endemic frog Leiopelma hochstetteri

Habitat-use model for the New Zealand endemic frog Leiopelma hochstetteri

Immunohistochemical studies on the development of the hypothalamo‐hyophysial system in Xenopus laevis

Water Balance and Arginine Vasotocin in the Cocooning FrogCyclorana platycephala(Hylidae)

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