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No one has filmed lice mating before, I guarantee you that," said Villa. They were flummoxed until an undergraduate researcher brought a heating pad into the lab for her sore back.

It gave Villa an idea. Turns out that for feather lice, a hot pad tuned to a bird's core temperature is where the magic happens.

What we didn't know, and what came out of this study, is that because of the way that the lice mate, adapting to a new host by changing size has this massive automatic effect on reproduction.

The study experimentally demonstrates ecological speciation, a concept first championed by Charles Darwin. Different populations of the same species locally adapt to their environments, and those adaptations can cause reproductive isolation and eventually, lead to the origin of a new species.

But they are always taking recently evolved species or populations that have already diverged and trying to understand why they're no longer reproductively compatible," said Dale Clayton, professor of biology and co-author of the study.

That's the new piece of this. The paper was published in the Proceedings of the National Academy of Sciences of the United States of America on June 10, Different-sized pigeons have different-sized lice; in most cases, the bigger the pigeon, the bigger their lice.

In , Clayton led a study that found that birds' preening drives this pattern. Feathers consist of ridges, called barbs, that create tiny gaps known as the interbarb space.

It's the pigeon's blind spot—lice wedge in their long, slender bodies to escape deadly beaks. When big lice crawl on smaller feathers, they stick out of the space and birds pick them off.

So it's good to be small, right? Not quite. In , this same research group found that bigger female lice lay more eggs.

Evolutionary winners fall into a sweet spot—they're just small enough to squeeze into the interbarb space, but big enough to outbreed smaller neighbors.

But preening puts the breaks on getting too big. There's a sweet spot," said Villa. The experimental change in size is heritable— the biologists showed that big parents had big offspring and small parents had small offspring, regardless of the size of the birds on which they were mating.

The parasitic lice populations adapted quickly. This pattern informs more than just this system. That's true for trees with parasitic insects, for fleas on animals, for ticks on mammals—it's true for life," Bush continued.

It happens everywhere. Part of what we're doing is trying to figure out that pattern. The researchers are the first to capture how feather lice mate.

By understanding the mechanics of lice sex, they saw what works, and what fails. In short—size matters. This dimorphism between the two sexes is critical for reproduction.

Males have thick antenna to cling to females during copulation. They approach the female from behind, slide underneath her and curl the tip of their abdomen while holding her thorax.

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Lice Sex
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Ninris · 06.01.2021 um 16:02

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