Passion Flower Butterfly Lives Long Thanks to Secret Diet and a Pinch of Genetics

The passion flower butterfly boasts an exceptionally long lifespan, with some individuals living up to 348 days – a stark contrast to the mere 14 days of its close relative, Dione juno. This remarkable longevity, a difference of 25 times, has long puzzled biologists, as such extreme variations are rare within closely related animal groups.

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So extreme a difference in lifespan within a closely related group is not seen anywhere else in the animal kingdom.

A key characteristic of these Heliconius butterflies is their adult diet. Unlike their relatives, they supplement their nectar intake with pollen, which they collect on their proboscis. They slowly digest this pollen, extracting essential amino acids. The partially digested residue is then discarded for a fresh portion.

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Is such a diet the secret recipe for a long life?

While this unique pollen-inclusive diet contributes to their extended lifespan, it's not the sole reason. Research from the University of Bristol indicates that even without pollen, Heliconius butterflies exhibit signs of delayed aging, such as maintained grip strength. This suggests that their extended lifespan is also deeply rooted in their genetic makeup.

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Researchers from the University of Bristol showed that a pollen diet does indeed contribute to the lifespan of the Heliconius butterfly, but that this is not the whole story.