My son kicks off the covers. Yet my daughter wants a thicker duvet. My husband wants the air conditioner, and I want it off. It seems that men and women really do feel differences in temperature. A new study believes that the answer is evolutionary.
Researchers at Tel Aviv University’s School of Zoology offer a new evolutionary explanation for the familiar scenario in which women bring a sweater into work, while their male counterparts feel comfortable wearing short sleeves in an air-conditioned office. The researchers concluded that this phenomenon is not unique to humans, with many male species of endotherms (birds and mammals) preferring a cooler temperature than the females.
The researchers: “We propose that males and females feel temperature differently. This is a built-in evolutionary difference between the heat-sensing systems of the two sexes, which is related, among other things, to the reproduction process and caring for offspring.”
The study was led by Dr. Eran Levin and Dr. Tali Magory Cohen from the School of Zoology and the Steinhardt Museum of Natural History at Tel Aviv University, Yosef Kiat from the University of Haifa, and Dr. Haggai Sharon, a pain specialist from Tel Aviv University’s Sackler Faculty of Medicine and the Tel Aviv Sourasky Tel Aviv Medical Center (Ichilov Hospital). The article was published in the Journal Global Ecology and Biogeography.
Dr. Levin and Dr. Magory Cohen say the bottom line is, going back to the human realm, “we can say that this difference in thermal sensation did not come about so that we could argue with our partners over the air conditioning, but rather the opposite: it is meant to make the couple take some distance from each other so that each individual can enjoy some peace and quiet.
“The phenomenon can also be linked to sociological phenomena observed in many animals and even in humans, in a mixed environment of females and males: females tend to have much more physical contact between themselves, whereas males maintain more distance and shy away from contact with each other.”
The new study included an in-depth statistical and spatial analysis of the distribution of dozens of bird and bat species living in Israel, along with a comprehensive review of the international research literature on the subject. Dr. Levin, who among other things studies the physiology and behavior of bats, noted in his previous studies that during the breeding season males and females tend to segregate, with the males inhabiting cooler areas.
For example, entire colonies in caves on the slopes of Mount Hermon are composed of only males during the breeding season, while in the warmer area of the Sea of Galilee there are mainly females, who give birth and raise their pups there. It was this phenomenon that aroused his curiosity.
Moreover, a study of the research literature reveals several examples of a similar phenomenon being observed in many species of birds and mammals.
In migratory bird species, males spend the winter in colder areas than females (it should be noted that in birds, the segregation between the sexes takes place outside of the breeding season, since the males participate in the raising of the chicks). Amongst many mammals, even in species that live in pairs or in mixed groups all their lives, the males prefer shade whereas the females prefer sunlight, or the males ascend to the peaks of mountains while the females remain in the valleys.
The reasoning behind the choice of birds and bats for the study is the fact that they fly and are therefore highly mobile, and the researchers hypothesized that the spatial separation between the sexes – sometimes extending to different climatic zones – would be particularly clear in these groups. Israel’s significant climate diversity allowed them to study individual animals of the same species that live in very different climatic conditions.
The findings of the study clearly demonstrated that males prefer a lower temperature than females, and that this preference leads to a separation between the sexes at certain periods during the breeding cycles, when the males and females do not need, and may even interfere, with each other.
Dr. Levin: “Our study has shown that the phenomenon is not unique to humans; among many species of birds and mammals, females prefer a warmer environment than males, and at certain times these preferences cause segregation between the two species.”
Dr. Magory Cohen notes that this difference has a number of evolutionary explanations. First, the separation between males and females reduces competition over resources in the environment, and keeps away males who may be aggressive and endanger the babies. Furthermore, many female mammals must protect their offspring at a stage when they are not yet able to regulate their body temperature on their own, so they developed a preference for a relatively warm climate.