How Do Insects Survive the Winter?

How Do Insects Survive the Winter?

♪ INTRO ♪ Unlike us lucky endotherms, insects can’t regulate their own body temperatures. They’re at the mercy of their environment. So when cold winter arrives, how do they keep from freezing? They basically have three choices: They can leave for warmer places, they can wait it out, or they can kick the bucket. Just like some birds, there are a few insects, like dragonflies or butterflies, that fly south for the winter. The most famous of these has got to be the monarch butterfly. There’s a population that normally lives in the northern U.S. and Canada, but spends the winter in the balmy mountain forests of Mexico. Of course, many insects have shorter lives than birds. So, a special migratory generation of the monarchs flies south thousands of miles to Mexico without reproducing, but it takes four or five generations to make the trip back north. If an insect can’t leave when winter arrives, option number two is to hunker down and wait for things to warm up again. Insects like ladybugs, emerald ash borers, and mourning cloak butterflies burrow into soil or leaf litter for warmth. There, these adult insects enter a kind of hibernation called diapause, thanks to hormones triggered by the shorter days and cooler temperatures of autumn. Their metabolic rates drop dramatically, so they don’t need as much food, and some species even pump their tissues full of alcohols that act as a natural antifreeze. Basically, these chemicals lower the freezing point inside their cells, which prevents damaging ice crystals from forming. Now, plenty of insects, like crickets and grasshoppers, just throw in the towel when the temperature drops. The adults die off after reproducing in the fall, and the next generation spends the winter as dormant eggs or larvae. These babies are usually pretty well equipped for survival. Eggs and larvae can enter diapause just like adults can, and some get extra help from their doomed parents. Praying mantises, for example, envelop their eggs in a foam-like protective protein case. These days, climate change is messing with the overwintering strategies of some insects. And it’s even letting some less cold-tolerant species venture farther north. Which… usually isn’t so great. Like, thanks to milder winters, the mountain pine beetle has been expanding its range and killing vast swaths of trees in western North America. So when it gets cold out, do you put on a coat and keep trucking? Curl up under a blanket with hot chocolate until spring? Or do you make like a monarch and head for the tropics? Whatever your way of dealing, spare a thought for the insects that make it work without central heating, just with some clever adaptations. Thanks to Patreon patron Zach Lerman for asking, and thanks to all of our patrons who keep these answers coming. If you’d like to submit questions to be
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15 thoughts on “How Do Insects Survive the Winter?”

  1. As long as Canada suffers, I'm okay with global warming. Hopefully everyone living on coastal cities will drown :3

  2. In Michigan we are getting more wolf spiders, and recluse spiders. I grew up in Alabama for 18 yrs and I've been in Michigan since 2011. I've noticed more Sumac is growing as well as ragweed. Different plants are growing.

  3. Trying to understand about bird migration and availability of insects and the need to get vitamin d from the Sun. It has to be all related but not sure if anyone has connected the dots yet.

  4. Oh god you have no idea how much this helps me thank you so much. I was searching Diapause and watching videos about it, but they just kept feeding me the same hard to understand textbook definitions over and over, which didn't really explain WHAT exactly this thing is. So this helped me immensely. Thank you very much! 😀

  5. I can´t even watch a video about how bugs survive the winter without the comment section is filled with political comments

  6. Thanks for getting straight to the point instead of making an 8 minute video ain’t nobody got time for. For that I’ll subscribe

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