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Mechanisms of Life History EvolutionThe Genetics and Physiology of Life History Traits and Trade-Offs$
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Thomas Flatt and Andreas Heyland

Print publication date: 2011

Print ISBN-13: 9780199568765

Published to Oxford Scholarship Online: December 2013

DOI: 10.1093/acprof:oso/9780199568765.001.0001

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Hormone regulation and the evolution of frog metamorphic diversity

Hormone regulation and the evolution of frog metamorphic diversity

Chapter 7 Hormone regulation and the evolution of frog metamorphic diversity
Mechanisms of Life History Evolution

Daniel R. Buchholz

Christine L. Moskalik

Saurabh S. Kulkarni

Amy R. Hollar

Allison Ng

Oxford University Press

A vast body of work exists on the hormonal regulation of frog metamorphosis, and a non-intersecting set of literature describes the large diversity and evolution of frog reproductive modes. Uniting these topics to understand the developmental basis for tadpole life history evolution is the exciting task of the future. The larval period in frogs is diverse and exhibits dramatic dependence on endocrine regulation, thereby providing an excellent opportunity to examine the role hormones play in the evolution of life history diversity. Tadpole life history diversity includes presence or absence of a free-swimming tadpole, larval period duration, and order of tissue transformation (heterochrony). These traits are all determined or affected by the thyroid hormone (TH), indicating that evolutionary changes in hormonal control underlie species diversity in tadpole life history traits. This chapter uses knowledge of mechanisms of tissue response to TH from model species in order to shed light on potential sites of evolutionary change in TH physiology that may underlie life history differences among species.

Keywords:   thyroid hormone, peripheral control, central control, thyroid hormone receptor, metamorphosis, tadpoles, neoteny, frog

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