Tracking Whale Metabolism Through Time: T3 and Corticosterone in Bowhead Baleen
A new study led by Justine Hudson of Fisheries and Oceans Canada explored how thyroid hormones and stress hormones interact across decades of a whale’s life using baleen as a biological timeline. Each baleen plate records years of hormone data, providing a unique window into long-term trends in whale metabolism, stress, and reproduction.
A Multi-Year Hormone Analysis in Bowhead Whales
Researchers analyzed baleen from eight male bowhead whales, each representing up to 22 years of continuous growth. Using the Arbor Assays Triiodothyronine (T3) ELISA Kit (K056) and Corticosterone Multi-Format ELISA Kit (K014), the team measured T3 and corticosterone (CORT) levels in serial samples along the baleen plates. Testosterone and nitrogen isotope (δ15N) data from the same whales provided additional context for reproductive cycles and diet.
Long-Term Hormone Records Reveal Unexpected Patterns in Whale Physiology
Contrary to expectations, T3 levels did not show consistent seasonal fluctuations that would reflect changes in migration, feeding, or reproduction. Instead, T3 concentrations were strongly and positively correlated with CORT across all individuals, regardless of season. This finding suggests that metabolic rate may be linked to physical or environmental stressors rather than predictable seasonal rhythms.
The results, published in General and Comparative Endocrinology, challenge the traditional assumption that thyroid and stress hormones act inversely under metabolic strain. In these bowhead whales, higher T3 appeared to accompany elevated CORT, indicating that physiological stress may also drive metabolic upregulation, perhaps to meet increased energetic demands.
This work builds on the research of Dr. Kathleen Hunt of George Mason University, a leading expert in whale endocrinology and a frequent collaborator on baleen-based hormone studies, including this study. Dr. Hunt’s lab has pioneered techniques for using baleen to reconstruct lifetime hormone histories, transforming how scientists assess stress, reproduction, and metabolism in large whales.
👉 Watch our conversation with Dr. Hunt on whale baleen endocrinology
Rethinking Energy and Stress in Marine Giants
Research using diverse tissues expands our understanding of thyroid regulation in large marine mammals. By leveraging baleen as a longitudinal record, Hudson’s team demonstrated that T3 can reflect chronic physiological patterns over decades, offering a powerful tool for assessing whale health and ecosystem change.
The results also highlight how stress physiology in marine species may differ fundamentally from terrestrial mammals—underscoring the value of long-term, noninvasive endocrine sampling for conservation physiology.
Why Researchers Choose Arbor Assays Kits
- Validated across species and sample types for robust, reproducible results.
- High sensitivity and accuracy, trusted by conservation endocrinologists worldwide.
- Flexible formats suitable for diverse matrices—from baleen and feathers to serum and feces.
- Backed by a growing body of peer-reviewed research, advancing wildlife and ecological science.
Ready to research? Explore more publications using Arbor Assays kits in our Publication Portal.
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In StockCorticosterone Multi-Format ELISA Kit
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