MEPS 453:249-261 (2012)  -  DOI: https://doi.org/10.3354/meps09613

Abundance of humpback whales in Oceania using photo-identification and microsatellite genotyping

Rochelle Constantine1,*, Jennifer A. Jackson, Debbie Steel, C. Scott Baker, Lyndon Brooks, Daniel Burns, Phillip Clapham, Nan Hauser, Bénédicte Madon, David Mattila, Marc Oremus, Michael Poole, Jooke Robbins, Kirsten Thompson, Claire Garrigue

1School of Biological Sciences, University of Auckland, Auckland 1142, New Zealand
*Email:
Co-author addresses are given in the Supplement at www.int-res.com/articles/suppl/m453p249_supp.pdf

ABSTRACT: Estimating the abundance of long-lived, migratory animals is challenging but essential for managing populations. We provide the first abundance estimates of endangered humpback whales Megaptera novaeangliae from their breeding grounds in Oceania, South Pacific. Using fluke photo-identification (1999−2004, n = 660 individuals) and microsatellite genotypes (1999−2005, n = 840 individuals), we estimated abundance with open capture-recapture statistical models. Total Oceania abundance and trends were estimated from 4 primary and 5 secondary sampling sites across the region. Sex-specific genotype data enabled us to account for the difference in capturability of males and females, by doubling male-specific estimates of abundance derived from genotypes. Abundance estimates were congruent between primary- and secondary-region data sets, suggesting that the primary regions are representative of all Oceania. The best estimate of total abundance was 4329 whales (3345−5313) in 2005, from a sex-specific POPAN super-population model, which includes resident whales and those migrating through the surveyed areas. A doubled-male POPAN abundance estimate from 2003 (n = 2941, 95% CI = 1648−4234) was considered the most plausible for the 4 primary survey areas and was similar to the 2003 doubled-male estimate derived from Pradel capture probabilities (n = 2952, 95% CI = 2043−4325). Our results confirm that Oceania is the least abundant humpback whale breeding population in the southern hemisphere. Pradel models showed no significant trend in abundance, which contradicts the recovery seen in most other populations throughout the world. Thus we suggest that the whales in this area warrant continued study and management attention.


KEY WORDS: Megaptera novaeangliae · South Pacific · Capture-recapture · Genotyping · Endangered species


Full text in pdf format
Supplementary material 
Cite this article as: Constantine R, Jackson JA, Steel D, Baker CS and others (2012) Abundance of humpback whales in Oceania using photo-identification and microsatellite genotyping. Mar Ecol Prog Ser 453:249-261. https://doi.org/10.3354/meps09613

Export citation
Mail this link - Contents Mailing Lists - RSS
- -