Reduced thermal tolerance in an amphibian treated with melatonin

Erskine, Dale J.; Hutchison, Victor H.

doi:10.1016/0306-4565(82)90043-2

Cited by 20 publications

(8 citation statements)

References 14 publications

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“…Acclimatization is determined by a combination of factors. Thermal tolerances (CT min and CT max ) vary with changes in local weather conditions where amphibians develop (Brattstrom, 1968;Hutchison, 1961;Hutchison and Kosh, 1964;Hutchison and Ferrance, 1970;Rome et al, 2002) and by the physiological condition of the animals (Burke and Pough, 1976;Claussen, 1969;Cupp, 1980;Erskine and Hutchison, 1982). It is likely that the changes in temperature and relative humidity between the dry and wet seasons are the environmental cues stimulating seasonal thermal acclimatization in R. arenarum.…”

Section: Discussionmentioning

confidence: 95%

“…The critical thermal maximum (CT max ) and critical thermal minimum (CT min ) are widely used to define the range of thermal tolerances of animals within their environments (Doughty, 1994;Huey and Stevenson, 1979;Stebbins and Cohen, 1995). In amphibians, thermal tolerances are influenced by hydration (Claussen, 1969;Pough and Wilson, 1970), nutritional status (Cupp, 1980), photoperiod (Hutchison, 1961;Hutchison and Kosh, 1964;Hutchison and Ferrance, 1970), melatonin (Erskine and Hutchison, 1982), and fatigue (Burke and Pough, 1976). Also, daily and seasonal fluctuations in environmental temperatures affect variation in the thermal tolerances of many species of ectotherms (Rome et al, 2002).…”

Section: Introductionmentioning

confidence: 97%

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Seasonal changes in the thermal tolerances of the toad Rhinella arenarum (Bufonidae) in the Monte Desert of Argentina

Sanabria

Quiroga

Martino

2012

Journal of Thermal Biology

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Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 97%

Seasonal changes in the thermal tolerances of the toad Rhinella arenarum (Bufonidae) in the Monte Desert of Argentina

Sanabria

Quiroga

Martino

2012

Journal of Thermal Biology

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“…Such a relationship has, however, not yet been investigated in amphibians. Recently, a role ofmelatonin in thermal selection has been proposed for amphibians (Erskine and Hutchinson, 1982).…”

Section: Discussionmentioning

confidence: 99%

Methoxyindole synthesis in the retina of the frog (rana esculenta) during a diurnal period

Flight

Mans

Balemans

1983

J. Neural Transmission

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In the present study, the synthesis of methoxyindoles in the neural part and in the pigment epithelial layer of the retina of the frog eye was investigated on the basis of naturally occurring substrate at regular intervals during a 24 hour period. Melatonin, 5-methoxytryptophol and 5-methoxyindole acetic acid were synthesized by the neural part of the retina only, while 5-methoxytryptamine and 5-methoxytryptophan were produced by both, the neural part of the retina and the pigment epithelium. The synthesis of melatonin and of 5-methoxytryptamine showed a diurnal rhythmicity. The results obtained clearly indicate that another cell type, i.e. pigment cells, is involved in indole metabolism besides photoreceptor elements. A possible functional relationship between different methoxyindoles and different retino-motor processes in the amphibian eye is discussed.

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“…Various other actions of MEL include its role in regulating circadian activity rhythms, melanosome aggregation, thyroid function and activity, and free-radical scavenging (e.g., Wright et al 1991;Krotewicz et al 1992;Krotewicz and Lewinski 1994;Cagnoli et al 1995;Reiter et al 1995;Hadley 1996;Reiter 1996;Wright et al 1996;Hyde and Underwood 2000). MEL can also modulate an animal's sensitivity to temperature extremes by reducing thermal tolerance (Erskine and Hutchison 1982).…”

Section: Introductionmentioning

confidence: 98%

Melatonin and thermoregulation in ectothermic vertebrates: a review

Lutterschmidt¹,

Lutterschmidt²,

Hutchison³

2003

Can. J. Zool.

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Precise behavioral thermoregulation is well documented in many ectothermic vertebrates. However, many complexities involving the influence of the pineal gland and melatonin (MEL) on thermoregulatory behavior, and thus body temperature (T b ), remain unresolved. Although MEL is commonly considered to decrease T b in both endotherms and ectotherms, several ectothermic species do not modulate T b in response to MEL. Furthermore, it is not yet clear how MEL integrates thermoregulatory behavior with environmental stimuli or how it modulates T b . Some inferences about MEL action in endotherms are not applicable to ectotherms. Changes in ectothermic T b are mediated primarily through behavioral modulation (not physiological modulation as in endotherms). Thus, the most likely mechanism underlying MEL's actions on ectothermic T b is adjustment of the temperature set point in the hypothalamus. We provide a review of the literature addressing the effects of MEL on thermoregulatory behavior in ectothermic vertebrates. We also discuss mechanisms underlying MEL's influence on physiological and behavioral processes in ectotherms and hypotheses regarding interspecific differences in pineal complex and MEL function.Résumé : La thermorégulation comportementale chez les vertébrés ectothermes est un phénomène bien connu. Cependant, des relations complexes concernant l'influence de la glande pinéale et de la mélatonine (MEL) sur le comportement thermorégulateur et, par conséquent, sur la température du corps (T b ), restent à préciser. Bien que MEL soit souvent considérée comme facteur de chute de la température T b , aussi bien chez les endothermes que chez les ectothermes, plusieurs espèces ectothermes ne modifient pas leur température T b en réaction à MEL. De plus, il reste encore à établir comment la mélatonine intègre le comportement thermorégulateur et les stimulus environnementaux et comment elle cause des modulations de la température T b . Certaines conclusions au sujet de l'action de MEL chez les endothermes ne se vérifient pas chez les ectothermes. Les modulations de la température T b chez les ectothernes sont comportementales (pas physiologiques comme chez les endothermes). Le mécanisme qui est le plus susceptible de contrôler l'action de MEL sur la température T b ectothermique consiste donc en un ajustement du réglage de la tempéra-ture dans l'hypothalamus. Nous proposons ici une revue de la littérature sur les effets de MEL sur le comportement themorégulateur des vertébrés ectothermes. Nous examinons les mécanismes qui peuvent être sous-jacents à l'influence qu'exerce MEL sur les processus physiologiques et comportementaux des vertébrés ectothermes et nous discutons des hypothèses expliquant les différences interspécifiques dans le fonctionnement de la glande pinéale et de MEL.[Traduit par la Rédaction] 13 Lutterschmidt et al.

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Reduced thermal tolerance in an amphibian treated with melatonin

Cited by 20 publications

References 14 publications

Seasonal changes in the thermal tolerances of the toad Rhinella arenarum (Bufonidae) in the Monte Desert of Argentina

Seasonal changes in the thermal tolerances of the toad Rhinella arenarum (Bufonidae) in the Monte Desert of Argentina

Methoxyindole synthesis in the retina of the frog (rana esculenta) during a diurnal period

Melatonin and thermoregulation in ectothermic vertebrates: a review

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