As if surviving at the bottom of a lake or stream, passing through two dozen or more life stages (instars), shedding their skin each time wasn’t enough, mayfly nymphs eventually rise to the surface and shed their skin one last time, emerging as winged adults. Having dodged all manner of fishes on the way, they breathe air for the first time and then fly off into it, also for the first time. Bypassing the traditional insect pupal stage, one morning a nymph is eating algae off a sunken log and that evening it’s flying for its life, trying to get to a bush or a tree before the birds and the bats can get it.
I wonder if mayfly nymphs realize what’s coming and how their lives will change. Would they do anything different?
Mayflies rest and get their bearings after their initial, panicky flight. One might think they’d be hungry after all they’ve been through, but it just doesn’t matter; they have no working mouth parts and couldn’t eat if they wanted to.
Even after a complete change of form and relocation to another world, mayflies are still not mature. They shed their skin one more time, trading their dull, lightly fringed wings for shiny ones that sparkle like crystal, sometimes changing the color of their bodies, even to the point of becoming nearly transparent. Plus, their sex organs function! All grown up and decked out in new duds, now it’s time to get it on. Continue reading