Bone microstructure and bone mineral density are not systemically different in Antarctic icefishes and related Antarctic notothenioids
| Autor: | Oghenevwogaga J. Atake, Thomas Desvignes, Katie Ovens, David M. L. Cooper, Isaac V. Pratt, Amir M. Ashique, B. Frank Eames, Ruiyi Guo, John H. Postlethwait, H. William Detrich |
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| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
Histology Zoology Antarctic Regions Chaenocephalus aceratus 010603 evolutionary biology 01 natural sciences notothenioid 03 medical and health sciences Bone Density Swim bladder Animals 14. Life underwater Molecular Biology Ecology Evolution Behavior and Systematics 030304 developmental biology bone microstructure Bone mineral 0303 health sciences Original Paper biology Antarctic icefish Champsocephalus micro‐CT Fishes Cell Biology Comparative anatomy biology.organism_classification Skeleton (computer programming) Channichthyidae Original Papers Perciformes skeletal evolution comparative anatomy Anatomy bone mineral density Heterochrony Developmental Biology |
| Zdroj: | Journal of Anatomy |
| ISSN: | 1469-7580 |
| Popis: | Ancestors of the Antarctic icefishes (family Channichthyidae) were benthic and had no swim bladder, making it energetically expensive to rise from the ocean floor. To exploit the water column, benthopelagic icefishes were hypothesized to have evolved a skeleton with “reduced bone,” which gross anatomical data supported. Here, we tested the hypothesis that changes to icefish bones also occurred below the level of gross anatomy. Histology and micro‐CT imaging of representative craniofacial bones (i.e., ceratohyal, frontal, dentary, and articular) of extant Antarctic fish species specifically evaluated two features that might cause the appearance of “reduced bone”: bone microstructure (e.g., bone volume fraction and structure linear density) and bone mineral density (BMD, or mass of mineral per volume of bone). Measures of bone microstructure were not consistently different in bones from the icefishes Chaenocephalus aceratus and Champsocephalus gunnari, compared to the related benthic notothenioids Notothenia coriiceps and Gobionotothen gibberifrons. Some quantitative measures, such as bone volume fraction and structure linear density, were significantly increased in some icefish bones compared to homologous bones of non‐icefish. However, such differences were rare, and no microstructural measures were consistently different in icefishes across all bones and species analyzed. Furthermore, BMD was similar among homologous bones of icefish and non‐icefish Antarctic notothenioids. In summary, “reduced bone” in icefishes was not due to systemic changes in bone microstructure or BMD, raising the prospect that “reduced bone” in icefish occurs only at the gross anatomic level (i.e., smaller or fewer bones). Given that icefishes exhibit delayed skeletal development compared to non‐icefish Antarctic fishes, combining these phenotypic data with genomic data might clarify genetic changes driving skeletal heterochrony. Antarctic icefishes are amazing examples of evolutionary adaptation. Here, we show quantitatively that icefish skeletons did not change bone microstructure or bone mineral density, relative to closely related fish species. |
| Databáze: | OpenAIRE |
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