Journal Article
Differences in developmental potential predict the contrasting patterns of dental diversification in characiform and cypriniform fishes
Jandzik, D. and Stock, D.W.
Record Number:
5205
Year:
2021
Journal:
Proceedings of the Royal Society B
Volume:
228: 2020.2205
Abstract:
Morphological diversification during adaptive radiation may depend on
factors external or internal to the lineage. We provide evidence for the
latter in characiform fishes (tetras and piranhas), which exhibit extensive
dental diversity. Phylogenetic character mapping supported regain of lost
teeth as contributing to this diversity. To test for latent potential for dentition
that would facilitate its evolutionary expansion, we overexpressed a tooth
initiation signal, the tumour necrosis factor pathway ligand ectodysplasin,
in a model characiform, the Mexican tetra (Astyanax mexicanus). This
manipulation resulted in extensive ectopic dentition, in contrast with its previously
reported limited effect in the zebrafish (Danio rerio). Tooth location in
the order Cypriniformes, to which the zebrafish belongs, is much more
restricted than in characiforms, a pattern that may be explained by differences
in the retention of ancestral developmental potential. Our results
suggest that differences in evolvability between lineages may lead to
contrasting patterns of diversification.
Times Cited:
1
Relevent Species: