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Marine Biology

, Volume 156, Issue 12, pp 2631–2640 | Cite as

Sighting characteristics and photo-identification of Cuvier’s beaked whales (Ziphius cavirostris) near San Clemente Island, California: a key area for beaked whales and the military?

  • Erin A. FalconeEmail author
  • Gregory S. Schorr
  • Annie B. Douglas
  • John Calambokidis
  • Elizabeth Henderson
  • Megan F. McKenna
  • John Hildebrand
  • David Moretti
Original Paper

Abstract

The relationship between beaked whales and certain anthropogenic sounds remains poorly understood and of great interest. Although Cuvier’s beaked whales (Ziphius cavirostris) are widely distributed, little is known of their behavior and population structure throughout much of their range. We conducted a series of five combined visual-acoustic marine mammal surveys from 2006 to 2008 in the southern San Nicolas Basin, a site of frequent naval activity off the southern California coast, west of San Clemente Island. The study area was defined by a 1,800 km2 array of 88 bottom-mounted hydrophones at depths up to 1,850 m. The array was used to vector visual observers toward vocalizing marine mammal species. Thirty-seven groups of Cuvier’s beaked whales were encountered during the study period. The overall encounter rate was one group for every 21.0 h of survey effort, and was as high as one group per 10.2 h of effort during the October 2007 survey. Whales were encountered in the deepest portion of the study area, at a mean bottom depth of 1,580 m (SD 138). The average group size was 3.8 individuals (SD 2.4), which was higher than has been reported from other studies of this species. Twenty-four groups were observed over multiple surfacings (median = 4 surfacings, range 2–15). The mean encounter duration of extended sightings was 104 min (SD 98, range 12–466 min) and the mean distance moved over the course of sightings was 1.66 km (SD 1.56, range 0.08–6.65 km). Temporal surfacing patterns during extended encounters were similar to dive behavior described from Cuvier’s beaked whales carrying time-depth recording tags. Seventy-eight photographic identifications were made of 58 unique individuals, for an overall resighting rate of 0.26. Whales were sighted on up to 4 days, with duration from first to last sighting spanning 2–79 days. For those whales sighted on subsequent days, the mean distance between subsequent sightings was 8.6 km (SD 7.9). Individuals resighted over 2–3 days were usually in association with previous group members. Approximately one-third of groups contained more than one adult male, and many of the repeated associations involved adult males. These observations suggest the basin west of San Clemente Island may be an important region for Cuvier’s beaked whales, and also one which affords an unusual opportunity to collect detailed data on this species. Given its status as an active military range, it can also provide the ability to monitor the behavior of individuals in the presence of naval sonar, a critical step in the management of this and other beaked whale populations worldwide.

Keywords

Hydrophone Beaked Whale Southern California Bight Sighting Condition Sighting Rate 

Notes

Acknowledgments

Data were collected under NMFS permit number 540–1811. Work was supported by funding from the US Navy N45 program. We wish to acknowledge Tarry Rago, Ron Morissey, Nancy DiMarzio, Susan Jarvis, Erin Oleson, Greg Campbell and Melissa Soldevilla for their role in remote acoustic monitoring. We wish to thank Captain Richard Vullo and the crew of the Sproul. We gratefully acknowledge the assistance of Jennifer Quan, Sara Blakeslee, Judd McGhee, Daniel Webster, Jeff Jacobsen, Bethany Diehl, Ilana Berry, Lillian Luce, Daniel Laggner, Greg Campbell, and Dave Weller during field data collection. Dean Yamashita, D. J. Pascua, Heidi Nevitt and numerous other personnel on San Clemente Island and at the Range Operations Center on North Island, San Diego provided essential logistical and technical support during surveys. Megan Ferguson and Damon Holzer assisted with GIS analyses. Thanks are due to Robin Baird, Gretchen Steiger, Phil Clapham, and three anonymous reviewers for their comments on early versions of this text.

Open Access

This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.

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Copyright information

© The Author(s) 2009

Open AccessThis is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License (https://doi.org/creativecommons.org/licenses/by-nc/2.0), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.

Authors and Affiliations

  • Erin A. Falcone
    • 1
    Email author
  • Gregory S. Schorr
    • 1
  • Annie B. Douglas
    • 1
  • John Calambokidis
    • 1
  • Elizabeth Henderson
    • 2
  • Megan F. McKenna
    • 2
  • John Hildebrand
    • 2
  • David Moretti
    • 3
  1. 1.Cascadia Research CollectiveOlympiaUSA
  2. 2.Scripps Institution of OceanographyLa JollaUSA
  3. 3.NAVSEA Division NewportNewportUSA

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