Trophic Levels of North Pacific Humpback Whales (Megaptera novaeangliae) Through Analysis of Stable Isotopes: Implications on Prey and Resource Quality

Authors

Briana H. Witteveen, University of Central Florida; University of Alaska - Fairbanks
Graham A. J. Worthy, University of Central Florida
Kate M. Wynne, University of Alaska - Fairbanks
Amy Hirons, Nova Southeastern UniversityFollow
Alexander G. Andrews III, National Oceanic and Atmospheric Administration
Russell W. Markel, University of British Columbia - Canada

Document Type

Article

Publication Title

Aquatic Mammals

ISSN

0167-5427

Publication Date

2011

Keywords

North Pacific, Prey quality, Stable isotopes, Trophic level, Humpback whales, Megaptera novaeangliae

Abstract

Trophic levels of 1,105 humpback whales from six geographically and isotopically distinct North Pacific feeding groups were calculated using δ¹⁵N of humpback whales and regional primary consumers. The overall mean trophic level for North Pacific humpback whales was 3.6 ± 0.02, indicating a diet of both fish and zooplankton, and, thus, supporting assumptions of humpback whales as generalist predators. The highest mean trophic level was calculated for the north Gulf of Alaska group (4.0 ± 0.03), while the lowest was found for the Russian and the western Aleutian Islands group (3.3 ± 0.08). Differences in mean trophic levels suggest that feeding groups differ in the proportion of fish and zooplankton in their diets.

DOI

10.1578/AM.37.2.2011.101

Volume

37

Issue

2

First Page

101

Last Page

110

Additional Comments

NOAA grant #: NA16FX1270

NSUWorks Citation

Briana H. Witteveen, Graham A. J. Worthy, Kate M. Wynne, Amy Hirons, Alexander G. Andrews III, and Russell W. Markel. 2011. Trophic Levels of North Pacific Humpback Whales (Megaptera novaeangliae) Through Analysis of Stable Isotopes: Implications on Prey and Resource Quality .Aquatic Mammals , (2) : 101 -110. https://nsuworks.nova.edu/occ_facarticles/775.