PUBLICATION

Thyroid hormone modulation during zebrafish development recapitulates evolved diversity in danionin jaw protrusion mechanics

Authors
Galindo, D., Sweet, E., DeLeon, Z., Wagner, M., DeLeon, A., Carter, C., McMenamin, S.K., Cooper, W.J.
ID
ZDB-PUB-190803-17
Date
2019
Source
Evolution & development   21(5): 231-246 (Journal)
Registered Authors
McMenamin, Sarah, Sweet, Elly
Keywords
functional morphology of feeding, metamorphosis, skull
MeSH Terms
  • Animals
  • Biological Evolution
  • Biomechanical Phenomena
  • Feeding Behavior
  • Jaw/physiology*
  • Maxillofacial Development/physiology
  • Thyroid Hormones/metabolism*
  • Zebrafish/growth & development
  • Zebrafish/physiology*
PubMed
31374588 Full text @ Evol. Dev.
Abstract
Protrusile jaws are a highly useful innovation that has been linked to extensive diversification in fish feeding ecology. Jaw protrusion can enhance the performance of multiple functions, such as suction production and capturing elusive prey. Identifying the developmental factors that alter protrusion ability will improve our understanding of fish diversification. In the zebrafish protrusion arises postmetamorphosis. Fish metamorphosis typically includes significant changes in trophic morphology, accompanies a shift in feeding niche and coincides with increased thyroid hormone production. We tested whether thyroid hormone affects the development of zebrafish feeding mechanics. We found that it affected all developmental stages examined, but that effects were most pronounced after metamorphosis. Thyroid hormone levels affected the development of jaw morphology, feeding mechanics, shape variation, and cranial ossification. Adult zebrafish utilize protrusile jaws, but an absence of thyroid hormone impaired development of the premaxillary bone, which is critical to jaw protrusion. Premaxillae from early juvenile zebrafish and hypothyroid adult zebrafish resemble those from adults in the genera Danionella, Devario, and Microdevario that show little to no jaw protrusion. Our findings suggest that evolutionary changes in how the developing skulls of danionin minnows respond to thyroid hormone may have promoted diversification into different feeding niches.
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Errata and Notes