Swim speed, behavior, and movement of North Atlantic right whales (Eubalaena glacialis) in coastal waters of northeastern Florida, USA

PLoS One. 2013;8(1):e54340. doi: 10.1371/journal.pone.0054340. Epub 2013 Jan 10.

Abstract

In a portion of the coastal waters of northeastern Florida, North Atlantic right whales (Eubalaena glacialis) occur close to shore from December through March. These waters are included within the designated critical habitat for right whales. Data on swim speed, behavior, and direction of movement--with photo-identification of individual whales--were gathered by a volunteer sighting network working alongside experienced scientists and supplemented by aerial observations. In seven years (2001-2007), 109 tracking periods or "follows" were conducted on right whales during 600 hours of observation from shore-based observers. The whales were categorized as mother-calf pairs, singles and non-mother-calf pairs, and groups of 3 or more individuals. Sample size and amount of information obtained was largest for mother-calf pairs. Swim speeds varied within and across observation periods, individuals, and categories. One category, singles and non mother-calf pairs, was significantly different from the other two--and had the largest variability and the fastest swim speeds. Median swim speed for all categories was 1.3 km/h (0.7 kn), with examples that suggest swim speeds differ between within-habitat movement and migration-mode travel. Within-habitat right whales often travel back-and-forth in a north-south, along-coast, direction, which may cause an individual to pass by a given point on several occasions, potentially increasing anthropogenic risk exposure (e.g., vessel collision, fishing gear entanglement, harassment). At times, mothers and calves engaged in lengthy stationary periods (up to 7.5 h) that included rest, nursing, and play. These mother-calf interactions have implications for communication, learning, and survival. Overall, these behaviors are relevant to population status, distribution, calving success, correlation to environmental parameters, survey efficacy, and human-impacts mitigation. These observations contribute important parameters to conservation biology, predictive modeling, and management. However, while we often search for predictions, patterns, and means, the message here is also about variability and the behavioral characteristics of individual whales.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.
  • Comment

MeSH terms

  • Animal Migration / physiology*
  • Animals
  • Behavior, Animal / physiology*
  • Environment
  • Florida
  • Humans
  • Swimming / physiology*
  • Whales / physiology*

Grants and funding

Program support was provided by the U.S. Army Corps of Engineers, Harbor Branch Oceanographic Institute at Florida Atlantic University and the Protect Florida Whales License Plate Fund, Lastinger Family Foundation, Sea World & Busch Gardens Conservation Fund, Catto Charitable Foundation, Friends of the GTM Reserve, Georgia Aquarium Research Fund, Ginn Championship Golf Tournament, Charles R. Bush Charitable Fund, Albert E. and Birdie W. Einstein Fund, Jacoby Development, Inc., Disney Worldwide Conservation Fund, Canaveral Port Authority, IBM International Foundation, Bank of America Foundation; and individual donors M. R. Adair, M. J. Haverstick, and H. P. Richter. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.