What does genetics say about a severe population bottleneck in our ancestor's history?

Has there ever been a severe population bottleneck in our history so much so that the entire homo population was reduced to a single couple? (Atleast within the past 1 million years).Does genetics completely rule out such a bottleneck within the past one million years?

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πŸ“…︎ Jan 16 2022
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15,000 years ago, the maned wolf species suffered a genetic bottleneck not because of a massive culling of the population, but simply because one wolf was too chad and tall
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πŸ‘€︎ u/Kanatama
πŸ“…︎ Jan 13 2022
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TIL that the largest volcanic eruption in the last 25 million years happened at the site of Lake Toba, in Indonesia, about 70k years ago. It caused a decade long global volcanic winter, and might have even caused a population bottleneck and reduced the global human population to less than 10,000 en.wikipedia.org/wiki/Tob…
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πŸ‘€︎ u/GibraltarofIce
πŸ“…︎ Jun 23 2021
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TIL of the Genetic Bottleneck Theory. Around 75,000 years ago, a supereruption occurred at Lake Toba in Sumatra, Indonesia. This resulted in the early human population to drop to 3k-10k unique genetic individuals. en.wikipedia.org/wiki/Tob…
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πŸ‘€︎ u/UtMan88
πŸ“…︎ Dec 10 2020
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The Toba catastrophe theory, proposes that a bottleneck of the human population 75,000 years ago, severely reduced the species genetic diversity. If this is true how would we be different today if it never occurred?
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πŸ‘€︎ u/beta_nerd
πŸ“…︎ Jan 26 2021
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How good is the evidence for a critical human population bottleneck in our past?
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πŸ‘€︎ u/gangofminotaurs
πŸ“…︎ Nov 09 2020
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TIL that approximately 10% of the small Micronesian atoll of Pingelap's inhabitants are afflicted with total color blindness. This is due in part to a population bottleneck caused by a typhoon and ensuing famine in the 1770s which killed all but twenty islanders. 0.003% of people have it in the US. en.wikipedia.org/wiki/Pin…
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πŸ“…︎ Nov 19 2019
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How does this "Mitochondrial Eve" thing work? Did humanity really population-bottleneck to a single female at one point in time?

So, every single living human being today, can have their lineage traced back to a Mitochondrial Eve. How does that even work? Did we really come that close to extinction that at some point, there was only one female human on the entire planet whose descendants didn't die out before making contact with others?

That's some cosmic horror level stuff right there. Every other pocket of human population dying, only the children of one woman living on... Holy crap...

Shouldn't this show some lower than normal genetic diversity tho? I heard cheetahs have debilitatingly low genetic dieversity due to a bottleneck in their population thousands of years ago... yet I never heard of humans having such.

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πŸ‘€︎ u/Doveen
πŸ“…︎ Sep 09 2019
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TIL about the Toba Catastrophe - the theory that 75,000 years ago, a massive volcano eruption reduced the human population to 3000, causing a genetic bottleneck that has reduced the genetic diversity in humans today. en.wikipedia.org/wiki/Tob…
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πŸ‘€︎ u/DreamHeist
πŸ“…︎ Jun 02 2018
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TIL The Toba Super-eruption was a supervolcanic eruption that occurred 75,000 years ago. It has been suggested this caused a volcanic winter lasting 6-10 years. The genetic bottleneck theory says the world population declined to 1,000-10,000 breeding pairs which we are all descended from. en.wikipedia.org/wiki/Tob…
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πŸ‘€︎ u/amansaggu26
πŸ“…︎ Apr 04 2019
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(Spoilers Extended) The coming winter as Westeros population-bottleneck moment

GRRM has promised that things start dying in winter. I expect that means that multiple people but more important houses will die out completely, in a kind of turning-point moment of Westerosi history.

The Freys are likely candidates. Even though Walder is a randy old goat with many kids, the foreshadowing (not to mention Arya's show plot) is strong that they will all be ended by Lady Stoneheart or similar.

Roose, Walda and Ramsay also seem endangered.

Some houses that might not be killed to a person would still be severely weakened and die out over the long term simply because they lack a stronghold, armies, wealth and strong heirs. For example, House Darklyn was ended in the immediate wake of the Defiance of Duskendale, but House Hollard hung on for another few years, but only in the form of Ser Dontos.

Which houses do you think will be exterminated wholly in the Long Night or so severely weakened that they don't recover?

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πŸ‘€︎ u/median401k
πŸ“…︎ Sep 22 2018
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TIL Lake Toba is the largest volcanic eruption to have happened in the last 25 million years, and was believed to have killed most of the human race at the time, causing a population bottleneck which affects genetic diversity to this day. en.wikipedia.org/wiki/Lak…
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πŸ“…︎ Apr 15 2017
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TIL 1 in 10 inhabitants on the island of Pingelap is color blind due to a 'population bottleneck' in 1775 after a catastrophic typhoon swept through the remote island leaving only 20 survivors. One of the survivors was King Nanmwarki Mwanenihsed, patient 0 with the rare Achromatopsia gene. en.wikipedia.org/wiki/Pin…
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πŸ‘€︎ u/KarlOveKnau
πŸ“…︎ Aug 10 2017
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Man-made environment has created an artificial ecosystem, which dramatically altered how people communicate with each other. The population is declining in developed countries, so in this artificially created population bottleneck, will human population increase nonstop some point in the future?

Technological development and industrial progress have significantly altered the physical environment in which people live. With increased access to phones, computers, television, Youtube, and other forms of communication media, humans are becoming increasingly connected, though with it comes increased demands for higher education, more adequate housing, better food quality, and steady careers or higher-paying jobs. All this increases the pressure for starting families later, and having fewer children. This results in a population bottleneck, where many developed countries face decreasing fertility (that is having less than two children on average, which is below the population replacement level). However, at some point in the future, as people balance life, family, and work, the population will likely increase once more, and keep on increasing.

How likely is this future, without human cloning, or robots replacing humans? Thank you for your interest, and please share your opinions or thoughts.

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πŸ‘€︎ u/Sparkykun
πŸ“…︎ Jan 08 2019
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Genomic evidence for two phylogenetic species and long-term population bottlenecks in red pandas advances.sciencemag.org/c…
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πŸ‘€︎ u/NoelleWilliams
πŸ“…︎ Feb 27 2020
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What do we now think caused the bottleneck in the human population ~70,000 years ago, if not the Lake Toba explosion?

I read that recent evidence suggests that the global effects of the Lake Toba eruption were not actually as huge as previously thought, and it is unlikely that this was the cause for the bottleneck in human population around that time. If the eruption wasn't the cause, what was?

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πŸ‘€︎ u/Kriegersahn
πŸ“…︎ Dec 06 2019
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Cool animation that depicts the migration of humans over the continents during the last 150.000 years, including a population bottleneck of just 15.000 we non-Africans probably all originate from. bradshawfoundation.com/jo…
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πŸ‘€︎ u/MrTulip
πŸ“…︎ May 15 2010
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If humanity had no population bottleneck, what would humans look like today?

Hello! I am a trained cultural anthropologist and I’ve always been fascinated with biodiversity especially how it relates to humankind. I am hoping to get opinions from some physical anthropologists on how humans may look today if we did not have a population bottleneck 50,000-100,000 years ago!

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πŸ‘€︎ u/Idiotgirlfriend
πŸ“…︎ May 14 2018
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[BottleneckDarkFuturology]Part 1. How the population bottleneck will manifest.. Part 1.. Rapid cascading food lock-out from synchronous production shocks.

you probably need a PC and Reddit Enhancement Suite (RES) to view all these embedded charts. TLDR at bottom

Six countries, the United States, China, Brazil, Argentina, Ukraine, and France, collectively account for

73% of global food production and

####93% of total exports,

The number of countries dependent on trade for net imports of food is increasing. It is not uncommon for exporting countries to impose restrictions like export taxes or export embargoes on agricultural commodities sold to other countries.

Restrictions become increasingly common when world shortages and high prices exist. These policies are meant to discourage exports and keep food within the surplus country for domestic consumers in order to maintain social stability.

Essentially, the restrictions mean that β€œour citizens eat first, if there is anything left over, your citizens can buy some.” and in some cases β€œOur citizens eat first and we will be storing the rest to buffer against potential supply shocks next year in order to maintain social stability”

https://imgur.com/5e4Hmbu On the other side of the spectrum some countries adherence to extremist political-economic ideologies such as neoliberalism make it unlikely for elites to allow trade restrictions. This creates a situation where exports continue to flow towards wealth while the internal underclasses are priced out of the food market and suffer malnutrition or starvation. There is no shortage of historical precedents for this scenario. The above chart shows just one example of a die off while food was being exported, the Irish great hunger. . The higher percent your income spent on food the lower your capacity to absorb higher food costs.

>When the potato blight destroyed their source of sustenance, the poorest – like the nearly 1 billion starving in the world today – had no purchasing power in the market for food. Throughout the five-year famine, Ireland was a large exporter of meat, dairy products, grain,peas, beans, onions, rabbits, salmon, oysters, herring, lard, honey.480,827 swine and 186,483 cows in 1846 alone, in "Black 47" calve export increased 33% from the previous year. 822,681 gallons of butter exported from during nine months of the worst year. In the twelve months following the second failure of the potato crop, 4,000 horses and ponies were exported. The export of bacon and ham increased. In total, over three million live animals were exported from Ireland between 1846-50, more than the n

... keep reading on reddit ➑

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πŸ‘€︎ u/MakeTotalDestr0i
πŸ“…︎ Sep 06 2018
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When Mt. Toba Erupted 75,000 years ago, it's posited that only a tiny fragment of humanity survived the global volcanic winter- a population bottleneck from which we're all descended en.wikipedia.org/wiki/Tob…
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πŸ“…︎ Aug 03 2018
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Standing on the shoulder of the central hospital. My current ps4 city, finally got around to working out how to share images. Population 6762, traffic at 91%, aiming for a grid with multiple simple highway junctions (previous cities were too reliant on bottlenecks).
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πŸ‘€︎ u/JamesDustjacket
πŸ“…︎ Feb 10 2019
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The district attorneys for both Philadelphia and Delaware County talked Friday about thinning the jail and prison populations in light of COVID-19. One issue that is causing a bottleneck is the offenders who are eligible for parole but can't get processed out because the courts were halted. 6abc.com/area-officials-w…
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πŸ‘€︎ u/Whey-Men
πŸ“…︎ Mar 28 2020
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Rising seas could result in 2 billion refugees by 2100. About one-fifth of the world’s population could become climate change refugees due to rising ocean levels. Those who once lived on coastlines will face displacement and resettlement bottlenecks as they seek habitable places inland. news.cornell.edu/stories/…
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πŸ‘€︎ u/drewiepoodle
πŸ“…︎ Jun 20 2017
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What is a reproductive bottleneck (based on Y chromosome sequencing) ? How is it possible that between 8,000 and 4,000 years ago, the effective breeding population of women was 17 times that of men.

I read this in a serious anthropology article, but am not myself an anthropologist. By breeding population, I assume one means between the age of 12 and 50? I assume that Y chromosome sampling is a way to determine if a bone fragment (or other type of fragment) comes from a male. thanks very much in advance for your time and help.

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πŸ‘€︎ u/Dorindon
πŸ“…︎ Feb 02 2017
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Question about the world-wide diaspora of homo sapiens since the bottleneck of the population around 70,000-100,000 years ago...

Can anyone refer me to a good source for the current estimates for the world-wide diaspora of homo sapiens since the bottleneck of the population around 70,000-100,000 years ago? I’m interested in things like estimated population size/growth over time, who went where when, etc. Thanks.

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πŸ‘€︎ u/nomenmeum
πŸ“…︎ Jan 26 2018
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Volcanic Winter, Population Bottlenecks, and Human Evolution - Stanley H. Ambrose, University of Illinois (2015) Toba erupted about 70k years ago and produced many climatic effects. It might also be responsible for the human bottleneck when only about 5000 breeding females were alive. youtube.com/watch?v=Nj1ds…
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πŸ‘€︎ u/alllie
πŸ“…︎ Jun 17 2019
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"'Magic number' for space pioneers calculated". For a viable human population, you need at least 160 people, preferably young childless couples, of varying genetic backgrounds, and genetically screened to avoid lethal recessives. (Note: Posted for collapse/species bottleneck talk, not space travel.) newscientist.com/article/…
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πŸ‘€︎ u/hillsfar
πŸ“…︎ Nov 29 2016
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Volcanic Winter, Population Bottlenecks, and Human Evolution - Stanley H. Ambrose, University of Illinois (2015) Toba erupted about 70k years ago and produced many climatic effects. It might also be responsible for the human bottleneck when only about 5000 breeding females were alive. youtube.com/watch?v=Nj1ds…
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πŸ‘€︎ u/alllie
πŸ“…︎ Jun 17 2019
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Richard Buggs - Email to Dennis Venema about human population bottlenecks richardbuggs.com/email-to…
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πŸ‘€︎ u/lapapinton
πŸ“…︎ Oct 06 2017
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AskScience: I know that somewhere on the web exists an animation/short movie that depicts the migration of humans over the continents with arrows snaking over a worldmap, including a population bottleneck. I can't find it. Can you help me out?
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πŸ‘€︎ u/MrTulip
πŸ“…︎ May 15 2010
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TIL: The massive Mt. Toba eruption 75,000 years ago may have reduced human populations to merely a few thousand, causing a genetic bottleneck. en.wikipedia.org/wiki/Tob…
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πŸ“…︎ Mar 09 2017
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"maximum pressure on nature occurs this century as human population peaks, after which a declining human population will supposedly ease that pressure.Conservation is to help as much of nature as possible squeeze through this population bottleneck.But what if the human species continues to multiply? theguardian.com/environme…
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πŸ‘€︎ u/MakeTotalDestr0i
πŸ“…︎ Jan 28 2019
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Stanley H. Ambrose - Volcanic Winter, Population Bottlenecks, and Human Evolution (2015) How most humans outside of Africa went through a population bottleneck and most humans outside of Africa evolved from East Africans. youtube.com/watch?v=Nj1ds…
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πŸ‘€︎ u/alllie
πŸ“…︎ Jan 21 2019
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TIL scientists are working on methods to introduce species diversity into the black-footed ferret population, after a 1981 bottleneck when there were only 18 in the world zooborns.com/zooborns/201…
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πŸ‘€︎ u/drproximo
πŸ“…︎ Aug 04 2016
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Late Pleistocene human population bottlenecks, volcanic winter, and differentiation of modern humans .pdf pdfs.semanticscholar.org/…
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πŸ‘€︎ u/MakeTotalDestr0i
πŸ“…︎ Feb 05 2019
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Population bottlenecks

So I've seen memes floating around boasting how genetic studies on population bottlenecks have disproven Adam & Eve. I've been trying to find said studies but have come up short and could only find the book "Adam and the genome". Can anyone provide some links?

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πŸ‘€︎ u/fattony2121
πŸ“…︎ Mar 14 2018
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[BottleneckDarkFuturology]. How the population bottleneck will manifest.. Part 1.. Rapid cascading food lock-out from synchronous production shocks. β€’ r/BottleNeck reddit.com/r/BottleNeck/c…
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πŸ‘€︎ u/MakeTotalDestr0i
πŸ“…︎ Sep 06 2018
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Population bottleneck wikipedia en.wikipedia.org/wiki/Pop…
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πŸ‘€︎ u/MakeTotalDestr0i
πŸ“…︎ Aug 01 2018
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How does this "Mitochondrial Eve" thing work? Did humanity really population-bottleneck to a single female at one point in time?

So, every single living human being today, can have their lineage traced back to a Mitochondrial Eve. How does that even work? Did we really come that close to extinction that at some point, there was only one female human on the entire planet whose descendants didn't die out before making contact with others?

That's some cosmic horror level stuff right there. Every other pocket of human population dying, only the children of one woman living on... Holy crap...

Shouldn't this show some lower than normal genetic diversity tho? I heard cheetahs have debilitatingly low genetic dieversity due to a bottleneck in their population thousands of years ago... yet I never heard of humans having such.

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πŸ‘€︎ u/Doveen
πŸ“…︎ Sep 09 2019
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