Article (Scientific journals)
Microstructural and compositional variation in pacu and piranha teeth related to diet specialization (Teleostei: Serrasalmidae)
Delaunois, Yann; Huby, Alessia; Malherbe, Cédric et al.
2020In Journal of Structural Biology, 210, p. 107509
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Keywords :
Cuticle; Enameloid; Ion substitution; Iron concentration; Biomineral; Pigmented teeth
Abstract :
[en] In any vertebrate group, tooth shape is known to fit with a biological function related to diet. However, little is known about the relationships between diet and tooth microstructure and composition in teleost fishes. In this work, we describe the external morphology, internal microstructure and elemental composition of the oral teeth of three representative species of the family Serrasalmidae having different feeding habits (herbivorous vs. omnivorous vs. carnivorous). We used backscattered-electron imaging and low vacuum environmental scanning electron microscope to compare the organization and mineralization of tooth layers as well as energy dispersive X-ray microanalysis and Raman microspectrometry to investigate the elemental composition, Ca/P ratio and mineralogy of the most superficial layers. Oral teeth of each serrasalmid species have the same internal orga- nization based on five distinctive layers (i.e. pulp, dentine, inner enameloid, outer enameloid and cuticle) but the general tooth morphology is different according to diet. Microstructural and compositional variation of the cuticle and iron-enrichment of superficial layers were highlighted between herbivorous and carnivorous species. Iron is more concentrated in teeth of the herbivorous species where it is associated with a thicker cuticle ex- plaining the more intense red-pigmentation of the cutting edges of oral teeth. The iron-enrichment is interpreted as a substitution of Ca by Fe in the hydroxyapatite. These traits are discussed in the light of the evolutionary history of the family. Further considerations and hypotheses about the formation and origin of the mineralized tooth layers and especially the iron-rich superficial layers in teleost fishes are suggested.
Research center :
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège
Laboratoire de Morphologie Fonctionnelle et Evolutive
Disciplines :
Life sciences: Multidisciplinary, general & others
Zoology
Author, co-author :
Delaunois, Yann   ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Morphologie fonctionnelle et évolutive
Huby, Alessia   ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Morphologie fonctionnelle et évolutive
Malherbe, Cédric ;  Université de Liège - ULiège > Département de chimie (sciences) > Chimie analytique inorganique
Eppe, Gauthier  ;  Université de Liège - ULiège > Département de chimie (sciences) > Chimie analytique inorganique
Parmentier, Eric  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Morphologie fonctionnelle et évolutive
Compère, Philippe ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Morphologie fonctionnelle et évolutive
 These authors have contributed equally to this work.
Language :
English
Title :
Microstructural and compositional variation in pacu and piranha teeth related to diet specialization (Teleostei: Serrasalmidae)
Publication date :
April 2020
Journal title :
Journal of Structural Biology
ISSN :
1047-8477
eISSN :
1095-8657
Publisher :
Elsevier, Atlanta, United States - California
Volume :
210
Pages :
107509
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 06 July 2020

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