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TL; DR: they found that mosquitoes survived through the dry-season (previous theory was that they were migrating from a humid region). The researchers are makin
by mrpopo 4y ago
TL; DR: they found that mosquitoes survived through the dry-season (previous theory was that they were migrating from a humid region). The researchers are making the supposition that the mosquitoes achieved this by entering "aestivation". Would be very interested to see what an aestivating mosquito would look like.
Edit: more reading about this.
The paper in question: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7449266/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7449266/
A paper from 2010 by the same authors already demonstrating mosquito persistance through another marking method : https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2929058/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2929058/
The 2010 paper goes into more details about evidence and counter-evidence for the aestivation theory.
- deleted 4y ago[deleted]
- msrenee 4y ago>Would be very interested to see what an aestivating mosquito would look like. Not very exciting, I would imagine. They probably just lay there. Jokes aside, this is a super interesting finding if that turns out to be what's going on.
- cowpig 4y agoIn a related question, I've always wondered how Mosquitoes survive winters. Where I live the winters are very cold, with entire months deep in the negatives. All water freezes. Would entering a state of torpor be a sufficient explanation for surviving winter? Would they need some other mechanism for surviving frost?
- ramraj07 4y agoDoesn’t that question apply to pretty much all insects? I thought the answer is they are buried deep or preserved in small amounts of water that doesn’t freeze (water never freezes all the way through).
- Liquix 4y agoCertain amphibians (i.e. tree frogs) have a "natural anti-freeze" compound in their blood. This allows them to hibernate through 20°F freezes - without any cell walls rupturing due to ice spikes - and just thaw back out in the spring. Perhaps parent comment was wondering if a special subspecies of mosquito or mutation was capable of the same?
- peteradio 4y agoWho says they survive cold winter climates? They die out in colder climates and migrate back from temperate climates. Mosquitos may not be killed by frost, but frost is a layered phenomenon, a hard freeze definitely kills them.
- lazide 4y agoI’m pretty sure that the mosquitos that show up almost instantly when things thaw in Alaska and Canada aren’t migrating from warmer climates. That would be pretty impressive, but no way do they move that fast.
- Huh1337 4y agoNot impossible - things in Alaska and Canada thaw as the last, so the mosquitos could be already on their way long before the thawing there began. However what I think is happening is that their eggs are what survives of them, and they hatch out quickly.
- vraid 4y agoThey can be very easy to miss as most of them piggyback on the great swarms of flying spiders, centipedes, and trees migrating north each year to repopulate the barren wastelands after the great freeze has killed all but the warm-blooded lifeforms.
- naravara 4y agoI have to imagine a non-trivial number of them survive in areas with human settlements. Maybe they start getting more active when it warms up.
- lazide 4y agoProbably not - they’re far worse where there aren’t humans for hundreds of miles. Mosquitos in the tundra are insane [https://www.nationalgeographic.com/animals/article/150915-Arctic-mosquito-warming-caribou-Greenland-climate-CO2 https://www.nationalgeographic.com/animals/article/150915-Ar...]
- poulpy123 4y agoI would expect the mosquitoes to die but their eggs to survive until warm enough
- stevenwoo 4y agoThe latest Frozen Planet series shows a queen bee surviving winter in Siberian forest by digging down into earth and awakening in the spring thaw so other insects can do something like this or use eggs to do it.
- akiselev 4y agoA very common adaptation among insects is producing large amounts of polyhydroxy alcohols like glycerol in the hemolymph that acts as anti-freeze or cryoprotectant depending on the species.
- jokoon 4y agoI think eggs can survive below zero temperature, but not longer than 6 months. In regions that are too cold, mosquitoes will just not thrive. Increase the average temperature of one degrees and a lot of regions will welcome mosquitoes.
- soperj 4y agoThis can't be true. I lived on the Canadian Prairies, where it was normally below freezing for 6 months every single year, and below minus 40 for several weeks at a time, and yet there were tons of mosquitoes every summer.
- Huh1337 4y agoBelow freezing air, but it's not freezing just few centimeters underground or underwater.
- jokoon 4y agothis gives enough time for the eggs to hibernate and hatch. for the eggs to die, there must be a lukewarm summer, and a long winter. beyond that, it's also about averages.
- soperj 4y agoI remember having snow on the ground every October, and it never leaving before April. I also remember having snow on the ground one year on my first day of school in August. They get hot summers though. Contrast that with the coast, when it's lukewarm summers, and barely a day with snow each year (lots of rain) but there are barely any mosquitoes.
- creato 4y agoNot only do they survive, it seems like the worst mosquitoes I experience are in areas with spring snowmelt in progress, even when there is no obvious standing water anywhere nearby.
- hammock 4y agoLots of bugs survive dry periods by basically becoming inactive. Ticks do it too