Development of limb bone laminarity in the homing pigeon (Columba livia)
| Autor: | Raffi Ourfalian, Rylee S. McGuire, Kelly Ezell, Andrew H. Lee |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Altriciality genetic structures lcsh:Medicine Biology 010603 evolutionary biology 01 natural sciences Pigeon General Biochemistry Genetics and Molecular Biology Homing pigeon 03 medical and health sciences medicine Positive allometry Torsional rigidity 030304 developmental biology 0303 health sciences Limb bone Link function General Neuroscience Homing (biology) lcsh:R General Medicine Anatomy Flight adaptation Osteon Polar section modulus medicine.anatomical_structure Limb bones Cortical bone General Agricultural and Biological Sciences |
| Zdroj: | PeerJ, Vol 8, p e9878 (2020) |
| ISSN: | 2167-8359 |
| Popis: | BackgroundBirds show adaptations in limb bone shape that are associated with resisting locomotor loads. Whether comparable adaptations occur in the microstructure of avian cortical bone is less clear. One proposed microstructural adaptation is laminar bone in which the proportion of circumferentially-oriented vascular canals (i.e., laminarity) is large. Previous work on adult birds shows elevated laminarity in specific limb elements of some taxa, presumably to resist torsion-induced shear strain during locomotion. However, more recent analyses using improved measurements in adult birds and bats reveal lower laminarity than expected in bones associated with torsional loading. Even so, there may still be support for the resistance hypothesis if laminarity increases with growth and locomotor maturation.MethodsHere, we tested that hypothesis using a growth series of 17 homing pigeons (15–563 g). Torsional rigidity and laminarity of limb bones were measured from histological sections sampled from midshaft. Ontogenetic trends in laminarity were assessed using principal component analysis to reduce dimensionality followed by beta regression with a logit link function.ResultsWe found that torsional rigidity of limb bones increases disproportionately with growth, consistent with rapid structural compensation associated with locomotor maturation. However, laminarity decreases with maturity, weakening the hypothesis that high laminarity is a flight adaptation at least in the pigeon. Instead, the histological results suggest that low laminarity, specifically the relative proportion of longitudinal canals aligned with peak principal strains, may better reflect the loading history of a bone. |
| Databáze: | OpenAIRE |
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