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Melica, V., S., Atkinson, J., Calambokidis, D., Gendron, A., Lang & J., Scordino (2022). Naturally stressed? Glucocorticoid profiles in blubber of blue and gray whales in response to life history parameters. Marine Mammal Science. 38(4): 1524-1548. DOI: 10.1111/mms.12954.

Naturally stressed? Glucocorticoid profiles in blubber of blue and gray whales in response to life history parameters

Valentina Melica 1, Shannon Atkinson 1, John Calambokidis 2, Diane Gendron 3, Aimee Lang 4 y Jonathan Scordino 5

1 Fisheries Department, College of Fisheries and Ocean Sciences, University of Alaska Fairbanks, Juneau, Alaska
2 Cascadia Research, Olympia, Washington
3 Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas, Pesquerias y Biologia Marina
4 Ocean Associates Inc., on contract to NOAA Southwest Fisheries Science Center, La Jolla, California
5 Marine Mammal Program, Makah Fisheries Management, Neah Bay, Washington
The goal of the present study was to carry out a thoroughmethodological validation and describe baseline profiles forglucocorticoid hormones (cortisol and corticosterone) inblubber from blue (n = 77) and gray (n = 103) whales fromthe eastern North Pacific Ocean. For each species, we modelledcortisol and corticosterone concentrations in responseto life history parameters (age, sex, reproductive status) andseason or geographic location. In blue whales, cortisol concentrationsdid not vary significantly by age class, sex, orreproductive status, whereas corticosterone was significantlylower in immature than in adult females (p < .001). Ingray whales, cortisol concentrations were significantlyhigher in lactating whales (p < .05), while corticosteronewas significantly different between females and males(p = .001) and elevated in calves (p = .003). In gray whales,corticosterone concentrations were significantly lower inmales sampled later in the year (August to November) comparedto both sexes sampled between March and August(p = .05), but no seasonal trend occurred in blue whales.Our results indicate that glucocorticoid actions varybetween species and sex in large whales. Analysis of multiplehormones improves our understanding of the physiologyof maintaining metabolic homeostasis or coping withchronic stressors.

Palabras clave: blue whale, corticosterone, cortisol, gray whale, metabolic; biomarkers, stress

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