Several Biochemical Alterations from Larval to Adult Types are Independent on Morphological Metamorphosis in a Salamander, Hynobius retardatus

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Biochemical transitions from larval to adult types, such as changes in hemoglobin subunits and pattern of excretion of nitrogen wastes, were studied during ontogeny of a salamander, Hynobius retardatus, which had been reported to show neotenic reproduction. A transition of hemoglobin subunits in normally metamorphosing and metamorphosed, and T_4-induced precociously metamorphosed H. retardatus was analyzed using SDS-PAGE. The transition of hemoglobin subunits from larval to adult types occurred on the same time schedule in both normally metamorphosing and precociously metamorphosed animals. A changeover from ammonotelism to ureotelism was analyzed by determining amounts of ammonia and urea excreted from normal and metamorphosis-arrested animals. A basic changeover from ammonotelism to ureotlism also occurred even in metamorphosis-arrested, aquatic larvae, on the similar time schedule in normally metamorphosing and metamorphosed animals. Because the transition of hemoglobin subunits in the metamorphosis-arrested larvae has been reported to occur on the same time schedule as in the controls, it is concluded that either transitions of hemoglobin subunits from larval to adult or pattern of nitrogen excretion from ammonotelism to ureotelism are independent on the morphological metamorphosis in H. retardatus. The substantial separation of biochemical "metamorphosis" from morphological metamorphosis will explain a possible cause of neoteny which has been reported in this species.
社団法人日本動物学会の論文
1994-08-15

Several Biochemical Alterations from Larval to Adult Types are Independent on Morphological Metamorphosis in a Salamander, Hynobius retardatus

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