Demographic and physiological signals of reproductive events in humpback whales on a southwest pacific breeding ground
Date
18/06/2024Author
Grant ID
RF\ERE\210306
UF160081
OS001021
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Show full item recordAbstract
The field of marine mammal conservation has dramatically benefited from the rapid advancement of methods to assess the reproductive physiology of individuals and populations from steroid hormones isolated from minimally invasive skin-blubber biopsy samples. Historically, this vital information was only available from complete anatomical and physiological investigations of samples collected during commercial or indigenous whaling. Humpback whales (Megaptera novaeangliae) are a migratory, cosmopolitan species that reproduce in warm, low-latitude breeding grounds. New Caledonia is seasonally visited by a small breeding sub-stock of humpback whales, forming part of the endangered Oceania subpopulation. To better understand the demographic and seasonal patterns of reproductive physiology in humpback whales, we quantified baseline measurements of reproductive hormones (progesterone – P4, testosterone - T, and 17β-estradiol – E2) using an extensive archive of skin-blubber biopsy samples collected from female humpback whales in New Caledonia waters between 2016-2019 (n = 194). We observed significant differences in the P4, T, and E2 concentrations across different demographic groups of female humpback whales, and we described some of the first evidence of the endocrine patterns of estrus in live free-ranging baleen whales. This study is fundamental in its methodological approach to a wild species that has a global distribution, with seasonally distinct life histories. This information will assist in monitoring, managing, and conserving this population as global ecological changes continue to occur unhindered.
Citation
Pallin , L , Garrigue , C , Kellar , N , Baker , C , Bonneville , C , Derville , S , Garland , E C , Steel , D & Friedlaender , A 2024 , ' Demographic and physiological signals of reproductive events in humpback whales on a southwest pacific breeding ground ' , Conservation Physiology , vol. 12 , no. 1 , coae038 . https://doi.org/10.1093/conphys/coae038
Publication
Conservation Physiology
Status
Peer reviewed
ISSN
2051-1434Type
Journal article
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