EdenteV2, France, Analysis, bibRecord, 000491

Comparative study of lower pharyngeal jaw structure in two phenotypes of Astatoreochromis alluaudi (teleostei: Cichlidae)

Identifieur interne : 000491 ( France/Analysis ); précédent : 000490; suivant : 000492

Comparative study of lower pharyngeal jaw structure in two phenotypes of Astatoreochromis alluaudi (teleostei: Cichlidae)

Auteurs : A. Huysseune [Belgique] ; J. Sire [France] ; F. J. Meunier [France]

Source :

Journal of Morphology [ 0362-2525 ] ; 1994-07.

RBID : ISTEX:8B36A4733F0B15794E245059680D94B69111416A

English descriptors

Abstract

The potentially molluscivorous East‐African cichlid Astatoreochromis alluaudi is known to exhibit phenotypic plasticity in its pharyngeal jaw apparatus. We examined wild‐caught (snail‐eating) fish and specimens experimentally reared on soft food for differences in bone structure in their lower pharyngeal jaw (LPJ). The LPJ is built up of two halves, each of which consists of four structural units: a bony dentigerous, sutural and cortical plate, surrounding a medullary cavity containing sparse bone. Histomorphometric data and associated statistical analysis on serial microradiographs through the posterior third region of the LPJ, where crushing forces are assumed to be the highest, reveal differing growth trajectories: (1) compensating for fish size (standard length) the LPJ grows to a significantly larger size and volume in snail‐eating specimens, (2) all structural units distinguished contribute to the volume increase of the LPJ in the hard versus the soft phenotype, and (3) the bone volume fraction in each of the units keeps pace with the growth of the unit proper, indicating that porosity does not change on one growth trajectory or from one phenotype to another. In addition, morphological observations show in hard food specimens: (1) the development of a structurally different bony layer along the inner side of the cortical plate, and (2) a reinforcement of the medullary cavity in the form of oriented trabeculae. Both are interpreted as a consolidation of the medullary cavity to resist the compressive forces exerted when hard food particles (mollusc shells) are crushed. © 1994 Wiley‐Liss, Inc.

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https://api.istex.fr/document/8B36A4733F0B15794E245059680D94B69111416A/fulltext/pdf

DOI: 10.1002/jmor.1052210103

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<term>Area measurements</term>
<term>Astatoreochromis</term>
<term>Astatoreochromis alluaudi</term>
<term>Astutoreochromis alluaudi</term>
<term>Attachment bone</term>
<term>Bone structure</term>
<term>Bone surface</term>
<term>Bone volume fractions</term>
<term>Bony units</term>
<term>Cancellous</term>
<term>Cancellous bone</term>
<term>Cichlasoma</term>
<term>Cichlid</term>
<term>Cichlid fishes</term>
<term>Cichlid pharyngeal</term>
<term>Cichlidae</term>
<term>Cortical</term>
<term>Cortical plate</term>
<term>Cortical plates</term>
<term>Cortical trabeculae</term>
<term>Dentigerous</term>
<term>Dentigerous plate</term>
<term>Dorsal</term>
<term>Dorsal surface</term>
<term>Fish size</term>
<term>Functional teeth</term>
<term>Greenwood</term>
<term>Ground sections</term>
<term>Hard food</term>
<term>Hard food phenotype</term>
<term>Hard food specimen</term>
<term>Hard food specimens</term>
<term>Hoogerhoud</term>
<term>Huysseune</term>
<term>Hwsseune</term>
<term>Image analysis</term>
<term>Kornfield</term>
<term>Lake victoria</term>
<term>Larger size</term>
<term>Lower pharyngeal</term>
<term>Medullary</term>
<term>Medullary cavity</term>
<term>Medullary trabeculae</term>
<term>Microradiographs</term>
<term>Outer layer</term>
<term>Pharyngeal</term>
<term>Pharyngeal jaws</term>
<term>Phenotype</term>
<term>Phenotypic plasticity</term>
<term>Pisces</term>
<term>Replacement teeth</term>
<term>Resorption</term>
<term>Soft food</term>
<term>Soft food specimen</term>
<term>Soft food specimens</term>
<term>Standard length</term>
<term>Statistical analysis</term>
<term>Structural units</term>
<term>Sutural</term>
<term>Sutural plate</term>
<term>Sutural plates</term>
<term>Suture</term>
<term>Trabecula</term>
<term>Transverse ground section</term>
<term>Volume increase</term>
<term>Witte</term>
<term>Zool</term>
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<term>Area measurements</term>
<term>Astatoreochromis</term>
<term>Astatoreochromis alluaudi</term>
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<front><div type="abstract" xml:lang="en">The potentially molluscivorous East‐African cichlid Astatoreochromis alluaudi is known to exhibit phenotypic plasticity in its pharyngeal jaw apparatus. We examined wild‐caught (snail‐eating) fish and specimens experimentally reared on soft food for differences in bone structure in their lower pharyngeal jaw (LPJ). The LPJ is built up of two halves, each of which consists of four structural units: a bony dentigerous, sutural and cortical plate, surrounding a medullary cavity containing sparse bone. Histomorphometric data and associated statistical analysis on serial microradiographs through the posterior third region of the LPJ, where crushing forces are assumed to be the highest, reveal differing growth trajectories: (1) compensating for fish size (standard length) the LPJ grows to a significantly larger size and volume in snail‐eating specimens, (2) all structural units distinguished contribute to the volume increase of the LPJ in the hard versus the soft phenotype, and (3) the bone volume fraction in each of the units keeps pace with the growth of the unit proper, indicating that porosity does not change on one growth trajectory or from one phenotype to another. In addition, morphological observations show in hard food specimens: (1) the development of a structurally different bony layer along the inner side of the cortical plate, and (2) a reinforcement of the medullary cavity in the form of oriented trabeculae. Both are interpreted as a consolidation of the medullary cavity to resist the compressive forces exerted when hard food particles (mollusc shells) are crushed. © 1994 Wiley‐Liss, Inc.</div>
</front>
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Comparative study of lower pharyngeal jaw structure in two phenotypes of Astatoreochromis alluaudi (teleostei: Cichlidae)

Comparative study of lower pharyngeal jaw structure in two phenotypes of Astatoreochromis alluaudi (teleostei: Cichlidae)

Source :

English descriptors

Abstract

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