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What is Lamprey Metamorphosis about?

Among vertebrates, true metamorphosis is restricted to amphibians, two groups of bony fishes, and lampreys. This chapter provides a comprehensive review of the ecology, morphology, physiology, and molecular biology of lamprey metamorphosis. The lamprey life cycle includes an embryonic period, a larval period ending with metamorphosis, a parasitic or non-parasitic juvenile period, and an adult reproductive period. Lamprey metamorphosis is influenced by endogenous and exogenous factors, most significantly a rise in spring water temperature, the accumulation of sufficient lipid reserves for the non-trophic metamorphic phase, and thyroid hormones. In lampreys, thyroid hormones appear to have a dual role, whereby high levels promote larval growth and a subsequent sharp decline is important for development and metamorphosis. As with other true metamorphoses, dramatic biochemical, cellular, and morphological changes occur during lamprey metamorphosis. The external changes are striking and include the development of an oral (suctorial) disc and eyes, restructuring of the branchial region, and changes in the fins and body coloration. Internal changes include major modifications to the diges

Author

Richard G. Manzon; John H. Youson; John A. Holmes

Publisher

Springer Netherlands

Published

2014

Language

EN

ISBN

9789401793063

Subjects

Agriculture, Science, Nature