Buoyant balaenids: the ups and downs of buoyancy in right whales.

Journal Article (Journal Article)

A variety of marine mammal species have been shown to conserve energy by using negative buoyancy to power prolonged descent glides during dives. A new non-invasive tag attached to North Atlantic right whales recorded swim stroke from changes in pitch angle derived from a three-axis accelerometer. These results show that right whales are positively buoyant near the surface, a finding that has significant implications for both energetics and management. Some of the most powerful fluke strokes observed in tagged right whales occur as they counteract this buoyancy as they start a dive. By contrast, right whales use positive buoyancy to power glides during ascent. Right whales appear to use their positive buoyancy for more efficient swimming and diving. However, this buoyancy may pose added risks of vessel collision. Such collisions are the primary source of anthropogenic mortality for North Atlantic right whales, whose population is critically endangered and declining. Buoyancy may impede diving responses to oncoming vessels and right whales may have a reduced ability to manoeuvre during free ascents. These risk factors can inform efforts to avoid collisions.

Full Text

Duke Authors

Cited Authors

  • Nowacek, DP; Johnson, MP; Tyack, PL; Shorter, KA; McLellan, WA; Pabst, DA

Published Date

  • September 2001

Published In

Volume / Issue

  • 268 / 1478

Start / End Page

  • 1811 - 1816

PubMed ID

  • 11522200

Pubmed Central ID

  • PMC1088813

Electronic International Standard Serial Number (EISSN)

  • 1471-2954

International Standard Serial Number (ISSN)

  • 0962-8452

Digital Object Identifier (DOI)

  • 10.1098/rspb.2001.1730


  • eng