Effects of an Endocrine Disruptor, Methoxychlor, on the Cutaneous Water Absorption in Japanese Tree-frogs

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概要

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• Global decline of population size and species in amphibians during the last few decades has been discussed among environmentalists and biologists for possible causes [lJ. Although various factors such as chemical or physical agents affecting environmental integrity have been considered as possible casuses for the decline, no decisive evidence has ever appeared [2J. Adult anuran amphibians usually do not drink water orally, but intake it mainly through a part of their ventral skin. We have previously shown that Japanese tree-frogs show sexual dimorphism in water absorption in the ventral skin. We examined the influence of an insecticide, methoxychlor, which has been known as an endodrine disruptor in modifying sexual integrity of animals, on the cutaneous water absorption of Japanese tree-frogs. After being kept for one month in water containing methoxychlor, male tree-frogs showed apparent depression of the cutaneous water absorption rate at concentration of 10-6 M or higher, but the agent had no effects on the females up to 10-5 M. When frogs were brought into a dehydrated environment after being kept in water containing methoxychlor for one month, all animals, males and females, showed a marked depression of the water absorption rate even at a low concentration of 10-9 M. These results suggest one possible reason for the severe decline in the amphibian population during 1960s when the agent had been widely used [3J, may be due to disability of the water absorption caused by the endocrine disruptors.

• 中国学園大学の論文

著者

• Kamishima Yoshihisa

  Department of Human Nutrition, Faculty of Contemporary Life Science, Chugokugakuen University

• Kamishima Yoshihisa

  Department Of Biology Faculty Of Education Okayama University

• Idehara Shigeko

  Department of Science Education, Faculty of Education, Okayama University

• Tsurumi Satomi

  Department of Science Education, Faculty of Education, Okayama University

• Fujimoto Yoshihiro

  Information Education Center of Okayama Prefecture Chugokugakuen University

• Tsurumi Satomi

  Department Of Science Education Faculty Of Education Okayama University

• Idehara Shigeko

  Department Of Science Education Faculty Of Education Okayama University

関連論文

• EXPRESSION OF ESTROGEN RECEPTOR ISOFORMS IN THE PITUITARY GLANDS OF DIABETIC MICE(Endocrinology,Abstracts of papers presented at the 76^ Annual Meeting of the Zoological Society of Japan)
• EXPRESSION OF ESTROGEN RECEPTOR mRNAs IN THE MOUSE PITUITARY GLANDS
• Angiotensin II Suppresses Water Absorption Through the Ventral Skin of Japanese Tree-Frogs in vitro.
• REGULATION OF EXPRESSION OF GH RECEPTOR mRNA IN THE MOUSE ANTERIOR PITUITARY GLAND(Endocrinology,Abstracts of papers presented at the 75^ Annual Meeting of the Zoological Society of Japan)
• Role of Symbiotic Algae on Gemmule Germination of a Freshwater Sponge, Radiospongilla cerebellata
• Effects of an Endocrine Disruptor, Methoxychlor, on the Cutaneous Water Absorption in Japanese Tree-frogs
• Role of Symbiotic Algae in Hatching of Gemmules of the Freshwater Sponge, Rndiospongilla cerebellata : Developmental Biology
• Electron Microscopic Study on the Integument of the Echinoid,Diadema setosum
• Regulation of Water Permeability of the Skin of the Treefrog, Hyla arborea japonica : Physiology
• Color Expression on Dorsal Skin of Japanese Tree Frogs
• CHROMATOPHORE PATTERN ON INTEGUMENT OF THE JAPANESE TREEFROG, Hyla arborea japonica.(Physiology)Proceedings of the Sixty-Third Annual Meeting of the Zoologiacal Socistry of Japan
• Organization and development of reflecting platelets in iridophores of the giant clam, Tridacna crocea Lamarck : Developmental Biology

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