Research shows day length impacts development of hamsters at UiT The Arctic University of Norway

Recent research from UiT The Arctic University of Norway indicates that the length of the day can significantly affect the development of hamsters.

The study focused on sensory cells in the Siberian dwarf hamster’s brain, specifically in the hypothalamus, which regulates vital bodily functions such as temperature, hunger, thirst, sleep, growth, and reproduction. Researchers simulated summer and winter day lengths, as well as durations typical of spring and autumn, to observe changes in survival strategies among hamster offspring.

In September, researcher Vebjørn Jacobsen Melum placed second in the national finals of the Forsker Grand Prix, where he discussed the development of juvenile hamsters.

The findings revealed that sensory cells detect whether nights are long or short, relaying this information to other brain control centers. Hamsters born during summer day lengths develop quickly and reach puberty sooner, showing that they receive numerous signals indicating high energy availability. Conversely, winter-born hamsters grow more slowly, delaying puberty to conserve energy. While summer-born hamsters typically reproduce two months after birth, those born in October may defer reproduction until the following March.

Melum, who collaborates with researchers from the University of Strasbourg, noted similar changes in sensory cells in golden hamsters. He emphasized that fundamental research is essential for a deeper understanding of how mammals utilize light for adaptations like winter fur and reproduction, suggesting that insights gained could inform how species adapt to climate change. Melum is also considering whether these findings might apply to other species, as his research includes a focus on different animals, such as grouse.