Tytuł
Continuous growth through winter correlates with increased resting metabolic rate but does not affect daily energy budgets due to torpor use
Autorzy
[ 1 ] Pracownia Technik Molekularnych i Biometrycznych, Muzeum i Instytut Zoologii PAN | [ P ] pracownik
Dyscyplina naukowa (Ustawa 2.0)
Rok publikacji
2021
Opublikowano w
Typ artykułu
artykuł naukowy
Język publikacji
angielski
Streszczenie
EN Small mammals that are specialists in homeothermic thermoregulation reduce their self-maintenance costs of normothermy to survive the winter. By contrast, heterothermic ones that are considered generalists in thermoregulation can lower energy expenditure by entering torpor. It is well known that different species vary the use of their strategies to cope with harsh winters in temperate zones; however, little is still known about the intraspecific variation within populations and the associated external and internal factors. We hypothesized that yellow-necked mice Apodemus flavicollis decrease their resting metabolic rate (RMR) from autumn to winter, and then increase it during spring. However, since the alternative for seasonal reduction of RMR could be the development of heterothermy, we also considered the use of this strategy. We measured body mass (mb), RMR, and body temperature (Tb) of mice during two consecutive years. In the first year, mice decreased whole animal RMR in winter, but did not do so in the second year. All mice entered torpor during the second winter, whereas only a few did so during the first one. Mice showed a continuous increase of mb, which was steepest during the second year. The relationship between RMR and mb varied among seasons and years most likely due to different mouse development stages. The mb gain at the individual level was correlated positively with RMR and heterothermy. This indicates that high metabolism in winter supports the growth of smaller animals, which use torpor as a compensatory mechanism. Isotope composition of mice hair suggests that in the first year they fed mainly on seeds, while in the second, they likely consumed significant amounts of less digestible herbs. The study suggests that the use of specialist or generalist thermoregulatory strategies can differ with environmental variation and associated differences in developmental processes.
Strony (od-do)
131 - 145
Typ licencji
CC BY (uznanie autorstwa)
Wersja tekstu w otwartym dostępie
oryginalna wersja autorska
Data udostępnienia
04.2021
Czas udostępnienia publikacji w sposób otwarty
w momencie opublikowania
Punktacja Ministerstwa / czasopismo
100
Punktacja Ministerstwa / czasopismo w ewaluacji 2017-2021
100
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