Daily torpor in Campbell's hamster (Phodopus campbelli Thomas, 1905): proximate factors and ultimate fitness consequences

Khrushchova, A.M.; Vasilieva, N.Y.; Shekarova, O.N.; Vasilieva, N.A.; Rogovin, K.A.

Авторы: Khrushchova A.M., Vasilieva N.Yu, Shekarova O.N., Vasilieva N.A., Rogovin K.A.
Журнал: Russian journal of theriology
Том: 22
Номер: 1
Год издания: 2023
Издательство: KMK Scientific Press
Местоположение издательства: Moscow, Russia (Federation)
Первая страница: 32
Последняя страница: 43
DOI: 10.15298/rusjtheriol.22.1.04
Аннотация: In 68 pairs of Campbell’s hamster (Phodopus campbelli Thomas, 1905) caged outdoors,under natural day length and temperature, we considered ambient temperatures, body mass and its changeas proximate factors of torpor bouts. The ultimate effects of daily torpor were assessed by the mortality ofanimals and the number of litters born. Both sexes showed daily torpor irregularly from November 2010 toJanuary 2011 with a maximum in December; 37% of males and 39% of females did not show any torporat all. There was no link between torpor episodes and low ambient temperatures during the whole winter,when considering the total winter period, however, we did find a significant link between ambient temperature and torpor use in December. Daily torpor in Campbell’s hamsters we studied seems not to be anobligate, strictly deterministic physiological response to critical body condition when the body reserves areclose to exhaustion. Among males, we observed a tendency towards a positive correlation of the number oftorpor bouts on the initial body mass in September. The body mass loss from September to December waspositively correlated to September’s body mass. Torpor pattern did not affect the hamsters’ survival and thenumber of litters born. We conclude that our results do not indicate daily torpor in Campbell’s hamster asan obligate life history adaptation, which should unconditionally enhance ultimate fitness consequences.
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Daily torpor in Campbell's hamster (Phodopus campbelli Thomas, 1905): proximate factors and ultimate fitness consequencesстатья

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