Hard prey, soft jaws and the ontogeny of feeding mechanics in the spotted ratfish Hydrolagus colliei
The spotted ratfish Hydrolagus colliei is a holocephalan fish that consumes hard prey (durophagy) but lacks many morphological characters associated with durophagy in other cartilaginous fishes. We investigated its feeding biomechanics and biting performance to determine whether it can generate bite...
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ftpubmed:oai:pubmedcentral.nih.gov:2607471 2023-05-15T18:51:07+02:00 Hard prey, soft jaws and the ontogeny of feeding mechanics in the spotted ratfish Hydrolagus colliei Huber, Daniel R Dean, Mason N Summers, Adam P 2008-01-30 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2607471 http://www.ncbi.nlm.nih.gov/pubmed/18238758 https://doi.org/10.1098/rsif.2007.1325 en eng The Royal Society http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2607471 http://www.ncbi.nlm.nih.gov/pubmed/18238758 http://dx.doi.org/10.1098/rsif.2007.1325 © 2008 The Royal Society Research Article Text 2008 ftpubmed https://doi.org/10.1098/rsif.2007.1325 2013-09-02T09:03:11Z The spotted ratfish Hydrolagus colliei is a holocephalan fish that consumes hard prey (durophagy) but lacks many morphological characters associated with durophagy in other cartilaginous fishes. We investigated its feeding biomechanics and biting performance to determine whether it can generate bite forces comparable with other durophagous elasmobranchs, how biting performance changes over ontogeny (21–44 cm SL) and whether biomechanical modelling can accurately predict feeding performance in holocephalans. Hydrolagus colliei can generate absolute and mass-specific bite forces comparable with other durophagous elasmobranchs (anterior=104 N, posterior=191 N) and has the highest jaw leverage of any cartilaginous fish studied. Modelling indicated that cranial geometry stabilizes the jaw joint by equitably distributing forces throughout the feeding mechanism and that positive allometry of bite force is due to hyperallometric mechanical advantage. However, bite forces measured through tetanic stimulation of the adductor musculature increased isometrically. The jaw adductors of H. colliei fatigued more rapidly than those of the piscivorous spiny dogfish Squalus acanthias as well. The feeding mechanism of H. colliei is a volume-constrained system in which negative allometry of cranial dimensions leaves relatively less room for musculature. Jaw adductor force, however, is maintained through ontogenetic changes in muscle architecture. Text spiny dogfish Squalus acanthias PubMed Central (PMC) Journal of The Royal Society Interface 5 25 941 953 |
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Research Article Huber, Daniel R Dean, Mason N Summers, Adam P Hard prey, soft jaws and the ontogeny of feeding mechanics in the spotted ratfish Hydrolagus colliei |
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Research Article |
description |
The spotted ratfish Hydrolagus colliei is a holocephalan fish that consumes hard prey (durophagy) but lacks many morphological characters associated with durophagy in other cartilaginous fishes. We investigated its feeding biomechanics and biting performance to determine whether it can generate bite forces comparable with other durophagous elasmobranchs, how biting performance changes over ontogeny (21–44 cm SL) and whether biomechanical modelling can accurately predict feeding performance in holocephalans. Hydrolagus colliei can generate absolute and mass-specific bite forces comparable with other durophagous elasmobranchs (anterior=104 N, posterior=191 N) and has the highest jaw leverage of any cartilaginous fish studied. Modelling indicated that cranial geometry stabilizes the jaw joint by equitably distributing forces throughout the feeding mechanism and that positive allometry of bite force is due to hyperallometric mechanical advantage. However, bite forces measured through tetanic stimulation of the adductor musculature increased isometrically. The jaw adductors of H. colliei fatigued more rapidly than those of the piscivorous spiny dogfish Squalus acanthias as well. The feeding mechanism of H. colliei is a volume-constrained system in which negative allometry of cranial dimensions leaves relatively less room for musculature. Jaw adductor force, however, is maintained through ontogenetic changes in muscle architecture. |
format |
Text |
author |
Huber, Daniel R Dean, Mason N Summers, Adam P |
author_facet |
Huber, Daniel R Dean, Mason N Summers, Adam P |
author_sort |
Huber, Daniel R |
title |
Hard prey, soft jaws and the ontogeny of feeding mechanics in the spotted ratfish Hydrolagus colliei |
title_short |
Hard prey, soft jaws and the ontogeny of feeding mechanics in the spotted ratfish Hydrolagus colliei |
title_full |
Hard prey, soft jaws and the ontogeny of feeding mechanics in the spotted ratfish Hydrolagus colliei |
title_fullStr |
Hard prey, soft jaws and the ontogeny of feeding mechanics in the spotted ratfish Hydrolagus colliei |
title_full_unstemmed |
Hard prey, soft jaws and the ontogeny of feeding mechanics in the spotted ratfish Hydrolagus colliei |
title_sort |
hard prey, soft jaws and the ontogeny of feeding mechanics in the spotted ratfish hydrolagus colliei |
publisher |
The Royal Society |
publishDate |
2008 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2607471 http://www.ncbi.nlm.nih.gov/pubmed/18238758 https://doi.org/10.1098/rsif.2007.1325 |
genre |
spiny dogfish Squalus acanthias |
genre_facet |
spiny dogfish Squalus acanthias |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2607471 http://www.ncbi.nlm.nih.gov/pubmed/18238758 http://dx.doi.org/10.1098/rsif.2007.1325 |
op_rights |
© 2008 The Royal Society |
op_doi |
https://doi.org/10.1098/rsif.2007.1325 |
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Journal of The Royal Society Interface |
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5 |
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25 |
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941 |
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953 |
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1766244912412491776 |