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:
Showing items related by title, author, creator and subject.
Orchestration : the movement and vocal behavior of free-ranging Norwegian killer whales (Orcinus orca) Shapiro, Ari D. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2008-06)Studying the social and cultural transmission of behavior among animals helps to identify patterns of interaction and information content flowing between individuals. Killer whales are likely to acquire traits culturally ...
Acoustic playback experiments to study behavioral responses of free-ranging marine animals to anthropogenic sound Tyack, Peter L. (Inter-Research, 2009-12-03)Growing concern about the effects of anthropogenic sound on marine life has highlighted the need for empirical methods to study behavioral responses of marine animals to specific acoustic exposures. Some effects have been ...
Development and functions of signature whistles of free-ranging bottlenose dolphins, Tursiops truncatus Sayigh, Laela S. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1992-09)This thesis presents data on the development and functions of individually distinctive signature whistles of free-ranging bottlenose dolphins, Tursiops tnmcatus. Research was conducted at a study site near Sarasota, ...