Positive Effects of Acclimation Temperature on the Critical Thermal Maxima of Ambystoma mexicanum and Xenopus laevis

Seasonal critical thermal maxima (CTMax) were determined for greenside (Etheostoma blennioides), fantail (Etheostoma flabellare), and rainbow (Etheostoma caeruleum) darters. Mean CTMax values for field-acclimatized greenside darters ranged from 26.2 °C in March to 35.1 °C in September. The values for fantail and rainbow darters were 30.8–36.0 °C (March–July) and 30.0–36.4 °C (April–July), respectively. CTMax values for the three species were significantly correlated (P < 0.05) with field water temperature (greenside darter, r = 0.970; rainbow darter, r = 0.964; fantail darter, r = 0.968). Fish acclimated at 10 and 20 °C in the laboratory exhibited significant seasonal changes in CTMax, with the highest values occurring in the summer. Except for fantail darters tested in summer, the three species showed significant relationships between CTMax and acclimation temperature. Seasonal differences were also observed in the slopes of the relationships between CTMax and acclimation temperature. The highest slopes occurred in spring, autumn, or both. Differences in the tolerance of darters to high temperatures and adjustment of tolerance to high temperature may influence their distributions in streams.

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Binding of adrenergic ligands to liver plasma membrane preparations from the axolotl, Ambystoma mexicanum; the toad, Xenopus laevis; and the australian lungfish, Neoceratodus forsteri

General and Comparative Endocrinology ◽

10.1016/0016-6480(88)90283-3 ◽

1988 ◽

Vol 71 (3) ◽

pp. 524-530 ◽

Cited By ~ 20

Author(s):

P.A. Janssens ◽

J.A. Grigg

Keyword(s):

Plasma Membrane ◽

Xenopus Laevis ◽

Ambystoma Mexicanum ◽

Liver Plasma Membrane ◽

Australian Lungfish

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Aktivität und Isoenzyme der Lactat-Dehydrogenase in Organen vom Amphibien (Xenopus laevis, Ambystoma mexicanum, Triturus alpestris und vulgaris) und der Effekt von Gonadotropininjektion auf das Enzym im Fettkörper des männlichen Krallenfrosches

Hoppe-Seyler´s Zeitschrift für physiologische Chemie ◽

10.1515/bchm2.1975.356.2.1277 ◽

1975 ◽

Vol 356 (2) ◽

pp. 1277-1282 ◽

Cited By ~ 7

Author(s):

Ilse Faulhaber ◽

Luisa Lyra

Keyword(s):

Xenopus Laevis ◽

Ambystoma Mexicanum ◽

Triturus Alpestris

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Vitamin A inhibits amphibian tail regeneration

Canadian Journal of Zoology ◽

10.1139/z87-070 ◽

1987 ◽

Vol 65 (2) ◽

pp. 457-459 ◽

Cited By ~ 10

Author(s):

Steven R. Scadding

Keyword(s):

Retinoic Acid ◽

Vitamin A ◽

Xenopus Laevis ◽

Ambystoma Mexicanum ◽

Complete Inhibition ◽

Notophthalmus Viridescens ◽

Tail Regeneration ◽

Dose Levels ◽

Dose Dependent

The objective of this investigation was to determine what effect vitamin A had on tail regeneration in Notophthalmus viridescens adults, in Ambystoma mexicanum larvae, and in Xenopus laevis tadpoles. Notophthalmus viridescens and Ambystoma mexicanum had their tails amputated and then were treated with retinol palmitate by immersion in concentrations known to cause proximodistal duplications in regenerating limbs. Xenopus laevis tadpoles had their tails amputated and then were treated with either retinol palmitate by immersion, or with retinoic acid administered by implantation of silastin blocks containing retinoic acid. The results ranged from no effect at all at the lower dose levels used, to complete inhibition of tail regeneration at higher dose levels. The degree of inhibition of tail regeneration appeared to be dose dependent. In no case were any duplicated or accessory structures formed analogous to those observed in regenerating limbs. This result suggests that the morphogenetic processes involved in tail regeneration are at least in some ways different from those occurring in limbs, where a similar vitamin A treatment would cause proximodistal duplication or production of accessory limb structures.

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