Termites show us something fascinating about monogamy: it can lead to unexpected changes, like the loss of tails in their sperm. A recent study found that this happened due to a lack of competition among male sperm, as these insects became long-term partners.
According to Nathan Lo, an evolutionary biologist at the University of Sydney, “This work shows that understanding social evolution isn’t just about gaining new traits. Sometimes, it’s about what evolution lets go.” As termites shifted to a strictly monogamous lifestyle, the pressure to maintain traits for sperm mobility faded away.
The study also highlights that termites evolved from solitary cockroaches that adapted to a wood-based diet. As they specialized in this low-nutrient food, their DNA also changed. Surprisingly, termites have fewer genes related to metabolism, digestion, and reproduction compared to cockroaches. Lo points out, “The surprising result is that termites increased their social complexity by losing genetic complexity.”
Interestingly, the timing of energy metabolism genes is crucial in determining whether a termite will become a worker or a king/queen. Larvae that get enough food develop faster and become workers, while those with less food grow more slowly and may eventually reproduce—often with close relatives.
These insights show how termites manage to build and sustain efficient societies through intricate food-sharing systems. Monogamy and the close relationships in termite colonies seem key to their social structure. It’s a unique example of how different life forms adapt their social systems, though it might not be a model for mammals to follow.
For more details on this research, see the original publication in Science.
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