Functional morphology of the cranio-mandibular complex of the Guira cuckoo (Aves)

The cranio-mandibular complex is an important structure involved in food capture and processing. Its morphology is related to the nature of the food item. Jaw muscles enable the motion of this complex and their study is essential for functional and evolutionary analysis. The present study compares a...

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Guardado en:
Detalles Bibliográficos
Publicado: 2018
Materias:
bite force
Cuculiformes
ecomorphology
Guira guira
mandibular muscles
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03622525_v279_n6_p780_Pestoni
http://hdl.handle.net/20.500.12110/paper_03622525_v279_n6_p780_Pestoni
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_03622525_v279_n6_p780_Pestoni
record_format dspace
spelling paper:paper_03622525_v279_n6_p780_Pestoni2023-06-08T15:35:06Z Functional morphology of the cranio-mandibular complex of the Guira cuckoo (Aves) bite force Cuculiformes ecomorphology Guira guira mandibular muscles The cranio-mandibular complex is an important structure involved in food capture and processing. Its morphology is related to the nature of the food item. Jaw muscles enable the motion of this complex and their study is essential for functional and evolutionary analysis. The present study compares available behavioral and dietary data obtained from the literature with novel results from functional morphological analyses of the cranio-mandibular complex of the Guira cuckoo (Guira guira) to understand its relationship with the zoophagous trophic habit of this species. The bite force was estimated based on muscle dissections, measurements of the physiological cross-sectional area, and biomechanical modeling of the skull. The results were compared with the available functional morphological data for other birds. The standardized bite force of G. guira is higher than predicted for exclusively zoophagous birds, but lower than for granivorous and/or omnivorous birds. Guira guira possesses the generalized jaw muscular system of neognathous birds, but some features can be related to its trophic habit. The external adductor muscles act mainly during food item processing and multiple aspects of this muscle group are interpreted to increase bite force, that is, their high values of muscle mass, their mechanical advantage (MA), and their perpendicular orientation when the beak is closed. The m. depressor mandibulae and the m. pterygoideus dorsalis et ventralis are interpreted to prioritize speed of action (low MA values), being most important during prey capture. The supposed ecological significance of these traits is the potential to widen the range of prey size that can be processed and the possibility of rapidly capturing agile prey through changes in the leverage of the muscles involved in opening and closing of the bill. This contributes to the trophic versatility of the species and its ability to thrive in different habitats, including urban areas. © 2018 Wiley Periodicals, Inc. 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03622525_v279_n6_p780_Pestoni http://hdl.handle.net/20.500.12110/paper_03622525_v279_n6_p780_Pestoni
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic bite force
Cuculiformes
ecomorphology
Guira guira
mandibular muscles
spellingShingle bite force
Cuculiformes
ecomorphology
Guira guira
mandibular muscles
Functional morphology of the cranio-mandibular complex of the Guira cuckoo (Aves)
topic_facet bite force
Cuculiformes
ecomorphology
Guira guira
mandibular muscles
description The cranio-mandibular complex is an important structure involved in food capture and processing. Its morphology is related to the nature of the food item. Jaw muscles enable the motion of this complex and their study is essential for functional and evolutionary analysis. The present study compares available behavioral and dietary data obtained from the literature with novel results from functional morphological analyses of the cranio-mandibular complex of the Guira cuckoo (Guira guira) to understand its relationship with the zoophagous trophic habit of this species. The bite force was estimated based on muscle dissections, measurements of the physiological cross-sectional area, and biomechanical modeling of the skull. The results were compared with the available functional morphological data for other birds. The standardized bite force of G. guira is higher than predicted for exclusively zoophagous birds, but lower than for granivorous and/or omnivorous birds. Guira guira possesses the generalized jaw muscular system of neognathous birds, but some features can be related to its trophic habit. The external adductor muscles act mainly during food item processing and multiple aspects of this muscle group are interpreted to increase bite force, that is, their high values of muscle mass, their mechanical advantage (MA), and their perpendicular orientation when the beak is closed. The m. depressor mandibulae and the m. pterygoideus dorsalis et ventralis are interpreted to prioritize speed of action (low MA values), being most important during prey capture. The supposed ecological significance of these traits is the potential to widen the range of prey size that can be processed and the possibility of rapidly capturing agile prey through changes in the leverage of the muscles involved in opening and closing of the bill. This contributes to the trophic versatility of the species and its ability to thrive in different habitats, including urban areas. © 2018 Wiley Periodicals, Inc.
title Functional morphology of the cranio-mandibular complex of the Guira cuckoo (Aves)
title_short Functional morphology of the cranio-mandibular complex of the Guira cuckoo (Aves)
title_full Functional morphology of the cranio-mandibular complex of the Guira cuckoo (Aves)
title_fullStr Functional morphology of the cranio-mandibular complex of the Guira cuckoo (Aves)
title_full_unstemmed Functional morphology of the cranio-mandibular complex of the Guira cuckoo (Aves)
title_sort functional morphology of the cranio-mandibular complex of the guira cuckoo (aves)
publishDate 2018
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03622525_v279_n6_p780_Pestoni
http://hdl.handle.net/20.500.12110/paper_03622525_v279_n6_p780_Pestoni
_version_ 1768546117011636224

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