Chum salmon migrating upriver accommodate to environmental temperatures through metabolic compensation
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- Takaaki K. Abe
- Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, Chiba 277-8564, Japan
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- Takashi Kitagawa
- Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, Chiba 277-8564, Japan
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- Yuya Makiguchi
- College of Bioresource Science, Nihon University, 1866 Fujisawa, Kanagawa 252-0880, Japan
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- Katsufumi Sato
- Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, Chiba 277-8564, Japan
説明
<jats:p>Ectotherms adjust their thermal performances to various thermal ranges by altering their metabolic rates. These metabolic adjustments involve plastic and/or genetic traits and pathways depend on species-specific ecological contexts. Chum salmon (Oncorhynchus keta Walbaum) are ecologically unique among the Pacific salmonids, as early-run and late-run populations are commonly observed in every part of their range. In the Sanriku coastal area, Japan, early-run adults experience high water temperatures (12–24°C) during their migration, compared with the late-run adults (4–15°C), suggesting that the two populations might have different thermal performances. Here, we found population-specific differences in the thermal sensitivities of metabolic rates (resting metabolic rate, RMR, and maximum (aerobic) metabolic rate, MMR) and critical temperature maxima. Then, using these parameters, we estimated thermal performance curves of absolute aerobic scope (AAS). The populations had different thermal performance curves of AAS, and in both populations high values of AAS were maintained throughout the range of ecologically relevant temperatures. However, the populations did not vary substantially in the peak (AAS at optimal temperature, ToptAAS) or breadth (width of sub-optimal temperature range) of the performance curves. The AAS curve of early-run fish was shifted approximately 3°C higher than that of late-run fish. Furthermore, when the data for RMR and MMR were aligned to the thermal differences from ToptAAS, it became clear that the populations did not differ in the temperature dependence of their metabolic traits. Our results indicate that chum salmon thermally accommodate through compensatory alterations in metabolic rates. Our results imply that metabolic plasticity and/or the effect of genetic variance on plasticity might play a pivotal role in their thermal accommodation.</jats:p>
収録刊行物
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- Journal of Experimental Biology
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Journal of Experimental Biology 222 jeb186189-, 2019-01-01
The Company of Biologists
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キーワード
詳細情報 詳細情報について
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- CRID
- 1360567186934310912
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- ISSN
- 14779145
- 00220949
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- データソース種別
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- Crossref
- KAKEN