African cuckoo finches pay genetic price for egg mimicry deception
Researchers at Boston University found that African cuckoo finches suffer hidden genetic costs while evolving better egg disguises to trick other birds.
Egg mimicry triggers evolutionary arms race
African cuckoo finch mothers lay eggs in the nests of prinias and cisticolas to avoid raising their own young. Host birds often reject these foreign eggs, forcing the finches to evolve better color patterns and speckling over many generations. This constant pressure creates an ongoing conflict between the deceptive parents and the vigilant hosts.
Harmful mutations hitchhike with good genes
The study published in Nature Ecology & Evolution suggests that strong selection for egg mimicry reduces genetic mixing during reproduction. Without normal recombination, harmful mutations become linked to beneficial traits and are dragged along through the population. Scientists led by Michael Sorenson suspect this process causes a hidden genetic burden for the deceptive species.
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