Stroke frequency, but not swimming speed, is related to body size in free-ranging seabirds, pinnipeds and cetaceans
Electronic Supplementary Material 1: A small insects move its wings invisibly fast, while a large bird (Wandering albatross at Kerguelen Island, Indian Ocean) flaps its wings slowly (1.743Mb)
Miller, Patrick J. O.
Ponganis, Paul J.
Costa, Daniel P.
Shapiro, Ari D.
MetadataShow full item record
It is obvious, at least qualitatively, that small animals move their locomotory apparatus faster than large animals: small insects move their wings invisibly fast, while large birds flap their wings slowly. However, quantitative observations have been difficult to obtain from free-ranging swimming animals. We surveyed the swimming behaviour of animals ranging from 0.5kg seabirds to 30000kg sperm whales using animal-borne accelerometers. Dominant stroke cycle frequencies of swimming specialist seabirds and marine mammals were proportional to mass−0.29 (R2=0.99, n=17 groups), while propulsive swimming speeds of 1–2ms−1 were independent of body size. This scaling relationship, obtained from breath-hold divers expected to swim optimally to conserve oxygen, does not agree with recent theoretical predictions for optimal swimming. Seabirds that use their wings for both swimming and flying stroked at a lower frequency than other swimming specialists of the same size, suggesting a morphological trade-off with wing size and stroke frequency representing a compromise. In contrast, foot-propelled diving birds such as shags had similar stroke frequencies as other swimming specialists. These results suggest that muscle characteristics may constrain swimming during cruising travel, with convergence among diving specialists in the proportions and contraction rates of propulsive muscles.
© 2007 Author et al. This is an EXiS Open Choice article distributed under the terms of the Creative Commons license version 2.5. The definitive version was published in Proceedings of the Royal Society B: Biological Sciences 274 (2007): 471-477, doi:10.1098/rspb.2006.0005.
The following license files are associated with this item:
Except where otherwise noted, this item's license is described as http://creativecommons.org/licenses/by/3.0/
Showing items related by title, author, creator and subject.
Shapiro, Ari D. (Acoustical Society of America, 2006-09)Animal signature vocalizations that are distinctive at the individual or group level can facilitate recognition between conspecifics and re-establish contact with an animal that has become separated from its associates. ...
Caller sex and orientation influence spectral characteristics of “two-voice” stereotyped calls produced by free-ranging killer whales Miller, Patrick J. O.; Samarra, Filipa I. P.; Perthuison, Aurelie D. (Acoustical Society of America, 2007-06)This study investigates how particular received spectral characteristics of stereotyped calls of sexually dimorphic adult killer whales may be influenced by caller sex, orientation, and range. Calls were ascribed to ...
Dietz, Rune; Shapiro, Ari D.; Bakhtiari, Mehdi; Orr, Jack; Tyack, Peter L.; Richard, Pierre; Eskesen, Ida Gronborg; Marshall, Greg (BioMed Central, 2007-11-19)Free-ranging narwhals (Monodon monoceros) were instrumented in Admiralty Inlet, Canada with both satellite tags to study migration and stock separation and short-term, high-resolution digital archival tags to explore diving ...