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Traits such as skeletal morphology and ecologically linked behaviors denote swimming activity; trade-offs in flexibility and rigidity along the vertebral column determine patterns of caudal oscillation. Here, we categorized 10 species of cetaceans (families Delphinidae and Kogiidae; N = 21 animals) into functional groups based on vertebral centra morphology, swimming speeds, diving behavior, and inferred swimming patterns. We quantified trabecular bone mechanical properties (yield strength, apparent stiffness, and resilience) among functional groups and regions of the vertebral column (thoracic, lumbar, and caudal). We extracted 6 mm3 samples from vertebral bodies and tested them in compression in 3 orientations (rostrocaudal, dorsoventral, and mediolateral) at 2 mm min\u22121. Overall, bone from the pre-fluke\/fluke boundary had the greatest yield strength and resilience, indicating that the greatest forces are translated to the tail during caudal oscillatory swimming. Group 1, composed of 5 shallow-diving delphinid species, had the greatest vertebral trabecular bone yield strength, apparent stiffness, and resilience of all functional groups. Conversely, Group 3, composed of 2 deep-diving kogiid species, had the least strong, stiff, and resilient bone, while Group 2 (3 deep-diving delphinid species) exhibited intermediate values. These data suggest that species that incorporate prolonged glides during deep descents in the water column actively swim less, and place relatively smaller loads on their vertebral columns, compared with species that execute shallower dives. We found that cetacean vertebral trabecular bone properties differed from the properties of terrestrial mammals; for every given bone strength, cetacean bone was less stiff by comparison. This relative lack of material rigidity within vertebral bone may be attributed to the non-weight-bearing locomotor modes of fully aquatic mammals.<\/jats:p>","DOI":"10.1093\/iob\/obab036","type":"journal-article","created":{"date-parts":[[2022,1,11]],"date-time":"2022-01-11T21:41:47Z","timestamp":1641937307000},"source":"Crossref","is-referenced-by-count":2,"title":["Vertebral Trabecular Bone Mechanical Properties Vary Among Functional Groups of Cetaceans"],"prefix":"10.1093","volume":"4","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1759-0604","authenticated-orcid":false,"given":"D N","family":"Ingle","sequence":"first","affiliation":[{"name":"Department of Biological Sciences, Florida Atlantic University, 777 Glades Road, Boca Raton, FL 33431, USA"},{"name":"Department of Marine Biology, Texas A&M University at Galveston, 200 Seawolf Parkway, Galveston, TX 77554, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3622-7114","authenticated-orcid":false,"given":"M E","family":"Porter","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences, Florida Atlantic University, 777 Glades Road, Boca Raton, FL 33431, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2022,1,7]]},"reference":[{"key":"2022021110132155800_bib1","first-page":"1","article-title":"Dependence of anisotropy of human lumbar vertebral trabecular bone on quantitative computed tomography-based apparent density","volume":"136","author":"Aiyanger","year":"2014","journal-title":"J Biomech Eng"},{"key":"2022021110132155800_bib2","doi-asserted-by":"crossref","first-page":"152","DOI":"10.1111\/j.1748-7692.2004.tb01146.x","article-title":"Composition of a school of Risso's dolphins, Grampus 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