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Thread: First Mass Extinction

  1. #1 First Mass Extinction 
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    I want to post about the first known mass extinction (you know, the one before the dinosaurs that wiped out about 90% of all life), but I really don't know that much about it. In fact, I don't even know the name, era of when it happened, or even the proof that it did happen. So can someone tell me or show me a good article about this mass extinction? Thanks!


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  3. #2  
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    The first extinction event took place not long after the cambrian explosion...

    There have been several extinction events. The one you're thinking of is called the K-T extinction event and took place about 65 and a half million years ago or so.

    http://en.wikipedia.org/wiki/Extinction_event
    http://en.wikipedia.org/wiki/Cretace...tinction_event

    Oops. No. You meant the big one before the dinosaurs.
    http://en.wikipedia.org/wiki/Permian...tinction_event


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  4. #3  
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    Ahh, Permian, that's it. Thanks for finding that on Wikipedia for me.
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  5. #4  
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    lol our human species have been through a mass extinction lol but we still survive today
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    We're going through one right now.

    http://en.wikipedia.org/wiki/Holocene_extinction_event
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    O.o u mean that if human over populate we will have a mass extinction because of starvation? o.O
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    From Wikipedia:

    The Holocene extinction event is a name customarily given to the widespread, ongoing mass extinction of species during the modern Holocene epoch. The extinctions vary from mammoths to dodos, to countless species in the rainforest dying every year. Because the rate of this extinction event appears to be much more rapid than the "Big Five" mass extinctions, it is also known as the Sixth Extinction. Since 1500 AD, 698 extinctions have been documented by the International Union for Conservation of Nature and Natural Resources[1]. However, since most extinctions are likely to go undocumented, scientists estimate that during the last century, between 20,000 and two million species have become extinct, but the precise total cannot be determined more accurately within the limits of present knowledge. The high estimates rely upon an annual loss of up to 140,000 species per year (based on Species-area theory)[2].

    In broad usage, the Holocene extinction event includes the remarkable disappearance of large mammals, known as megafauna, by the end of the last ice age 9,000 to 13,000 years ago. Such disappearances have been considered as either a response to climate change, a result of the proliferation of modern humans, or both. These extinctions, occurring near the Pleistocene / Holocene boundary, are sometimes referred to as the Pleistocene extinction event or Ice Age extinction event. However the Holocene extinction event continues through the events of the past several millenia and includes the present time.

    The observed rate of extinction has accelerated dramatically in the last 50 years, to a pace which appears to be greater than the rate seen during the Big Five. There is no general agreement on whether to consider more recent extinctions as a distinct event or merely part of a single escalating process. Only during these most recent parts of the extinction have plants also suffered large losses. Overall, the Holocene extinction event is most significantly characterised by the presence of man-made driving factors and its very short geological timescale (tens to thousands of years) compared to most other extinction events.



    We've weathered rather well so far. We are a rather adaptive species as is evidenced by our vast change in lifestyle over the past several million years, but are we adaptive enough?

    Time will tell.
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  9. #8  
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    that thing about mass extinction caused by humans is debated. also we havent experienced a mass extinction, the alst one were 65 million years ago, long before us.

    we humans will cause some species to die out, its normalspecies comes and species goes. We have never had such biodevirity as we do today. So we can kill alot before its significanly small. watch bullshit and they explain it way good.
    I am zelos. Destroyer of planets, exterminator of life, conquerer of worlds. I have come to rule this uiniverse. And there is nothing u pathetic biengs can do to stop me

    On the eighth day Zelos said: 'Let there be darkness,' and the light was never again seen.

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    that thing about mass extinction caused by humans is debated.
    Of course it is.

    Couple of things.

    First. It's not necessarily caused by humans (although humans would most certainly have played a part in the acceleration of the trend over recent years.

    It's unlikely that humans caused the extinction of the megafauna. The more likely culprit is climate change. But, humans did stress the already taxed species. Driving the final nail in the coffin. Perhaps.

    Second. From wikipedia: "A 1998 survey by the American Museum of Natural History found that 70% of biologists view the present era as part of a mass extinction event, the fastest to have ever occurred."

    Sure it's debatable, but the thing is that species are dying off on a large scale and have been doing so for quite some time. Why? Many reasons. Man is behind some of them. But, more to the point, these reasons are behind man...

    Man emerged from the last ice age with a new vigor. Man has been able to adapt to the changing climate as not all animals have been able to.

    The climate continues to change even today and its debatable just how much of this is attributable to man's actions and how much is the natural cycle of world climate change.

    The causes are debatable. The end result is not.
    The world's climate has been on the move for the last several millenia. Not all animals are able to cope.

    Also, consider the pollution of ecosystems by introduction of alien species, this has caused innumerable species deaths as well.


    I think the numbers are a bit high up there. 2 million species gone extinct in the last century. Pshaw.

    Even considering that more species are disappearing than are being counted, this is nothing compared to the species that have gone extinct in the past and have never been counted.

    I wonder what the ratio is between known species now and past? Do we know more about the present state of the ecosystems or the past? Is the fossil record stronger than the living one?

    Questions without answers, really.
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    i agree. How can they say like 120000 per year when they esimate there is atleast several million ones we dont know off?

    also, most of them will be insects. and those are fast in getting new speceis, like one disaphere and its quickly filled by insects
    I am zelos. Destroyer of planets, exterminator of life, conquerer of worlds. I have come to rule this uiniverse. And there is nothing u pathetic biengs can do to stop me

    On the eighth day Zelos said: 'Let there be darkness,' and the light was never again seen.

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  12. #11  
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    I would be interested to see a photograph of a bucket of sand you have your head buried in. :wink:
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    me? im not burried in any sand. Its simply so that scientists have also predicted like 1% is gone in 100 years. wow what a mass extinction . Most is insects, most will be replaced by insects. species dieng is natural. and also if we died out species owuld die out. they are depended on us even if we dont take care of them.
    I am zelos. Destroyer of planets, exterminator of life, conquerer of worlds. I have come to rule this uiniverse. And there is nothing u pathetic biengs can do to stop me

    On the eighth day Zelos said: 'Let there be darkness,' and the light was never again seen.

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  14. #13  
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    It's important to realize that extinction events take place in geologic age. Millions of years. Not centuries.
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    It's important to realize that extinction events take place in geologic age. Millions of years. Not centuries.
    Centuries + all of the time they already existed
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  16. #15  
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    Quote Originally Posted by Zelos
    me? im not burried in any sand. Its simply so that scientists have also predicted like 1% is gone in 100 years. wow what a mass extinction . Most is insects, most will be replaced by insects. species dieng is natural. and also if we died out species owuld die out. they are depended on us even if we dont take care of them.
    Sorry, Zelos but you are talking utter crap. We have lost one hell of a lot more than 1% of species in 100 years. We are losing at a dramatic rate.

    The total Holocene extinction places it - as is noted in the links - as the most rapid extinction event ever. 75% of biologists consider that it is a mass extinction event. (The bulk of the rest consider it significant.)
    You appear to be speaking from a standpoint of opinion, with no consideration of any facts whatsoever. Please study this issue properly before responding with a glib, inaccurate reply.
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    75% is alot, have never seen it. Opholite what proof do we humans have that a mass extinction is happening now? and then i want proof that is in no way coincidental

    That species dies isnt proof in itself, species dis all the time to be replaced by other specieses
    I am zelos. Destroyer of planets, exterminator of life, conquerer of worlds. I have come to rule this uiniverse. And there is nothing u pathetic biengs can do to stop me

    On the eighth day Zelos said: 'Let there be darkness,' and the light was never again seen.

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  18. #17  
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    Zelos, just google current mass extinction. I'm not doing your work for you.
    Please list ten of the new species that have replaced the thousands that have disappeared.
    Please learn to read, absorb and understand. Stop shooting from the hip.
    Where have I said that man was responsible? I am simply stating the clearly observed fact - we are in the midst of a mass die off. Period. End of story. Accept it, or just keep that bucket of sand handy.
    You don't have the excuse that lackadaisical does of being trapped within the constraints of an fundmentalist religion, nevertheless you appear to be trapped in something just as dangerous.
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  19. #18  
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    Ophiolite. Dont insult me. as a moderator you arent making a very good exemple.

    But i can agree on thou that there is a higher rate of extinction. But we can never be sure its mass extinction wich will result in 50%> loss of life. But we have the greatest biodiversity than any era before us.

    Its natural with mass extinctions once in a while. pecies comes species goes. Why try to stop the inevdible? We wont succed anyhow. Species will die, a mass extinction will happen. And life will go on with new forms after.

    Like the borg would have said it: "Resistence is futile"

    Also Ophiolite. I have seen this kind of argument bieng used by enviormentalists, tree huggers etc. Im familiar with that they use missleading info to make people support them. So im very sceptic to this. I acctualy saw on a tv dokumentary about eniormentalists.
    Enviormentalist: "We are going to lose 50% of all species in the next 50 years"
    Scientsit: "There is no shred of evidence supporting that statement. our latest prediction predict a loss of 1% in the next 100 years"
    He had been a former eniormentalist. and to be honest, i think that statement is much more probible than 50% in 50years
    I am zelos. Destroyer of planets, exterminator of life, conquerer of worlds. I have come to rule this uiniverse. And there is nothing u pathetic biengs can do to stop me

    On the eighth day Zelos said: 'Let there be darkness,' and the light was never again seen.

    The king of posting
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  20. #19  
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    Quote Originally Posted by Zelos
    Ophiolite. Dont insult me. as a moderator you arent making a very good exemple.
    Please identify a single insult in any of my posts to you. I am making observations, each of which is readily demonstrable.
    Quote Originally Posted by Zelos
    But i can agree on thou that there is a higher rate of extinction. But we can never be sure its mass extinction wich will result in 50%> loss of life. But we have the greatest biodiversity than any era before us.
    So you wish to wait until we tip over the 50% mark before you are ready to call it a mass extinction? I dare say if you fell out of an aeroplane at 2000' without a parachute, over a concrete runway, you would say "Well, I don't see how you can call this a fatal fall. I am still alive."
    At least you have finally acknowledged that there is a high extinction level. That is some progress. Please go away and study the facts. If you consider it to be insulting to be told you need to do this, when it is self evident that you do, then I am at a loss. Would you like me to compliment you on the depth of your knowledge on this topic, when you do not have any such depth. You appear to be basing your beliefs on inherent scepticism of 'treehuggers' and something you saw on a documentary.

    The facts are out there. Go and read them. Go and study them. I am not saying their is a mass extinction event. Biologists, zoolologists, botanists, palaeontologists, globally are saying there is a mass extinction event.
    The fact that the onset of this extinction event coincides with the rise of man; that the acceleration of the extinction coincides with the expansion of man; these are suggestive associations. But they are independent of the underlying fact that a mass extinction event is in progess.

    By the way, where did you acquire the idea that we have more biodiversity today than at any time in the past?
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  21. #20  
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    So you wish to wait until we tip over the 50% mark before you are ready to call it a mass extinction? I dare say if you fell out of an aeroplane at 2000' without a parachute, over a concrete runway, you would say "Well, I don't see how you can call this a fatal fall. I am still alive."
    humorus, and i see your point.

    At least you have finally acknowledged that there is a high extinction level. That is some progress.
    for your information, i can be damn stuborn about me bieng right, but if i am over shredded with evidence i stop. or atleast partly.

    If you consider it to be insulting to be told you need to do this, when it is self evident that you do, then I am at a loss.
    thats not it, look further down in the post.


    You appear to be basing your beliefs on inherent scepticism of 'treehuggers' and something you saw on a documentary
    well, i hate treehuggers, damn treehuggers. And what they said on the dokumentary were quite convincing, but of course they could be wrong.

    Biologists, zoolologists, botanists, palaeontologists, globally are saying there is a mass extinction event.
    this is a rather split subject, soem say some doesnt. what i know off its not like a great majority on either side.

    By the way, where did you acquire the idea that we have more biodiversity today than at any time in the past?
    wikipedia
    http://en.wikipedia.org/wiki/Biodiversity
    http://en.wikipedia.org/wiki/Image:P...odiversity.png
    this diagram shows a greater amount of species today than ever before, of course it could simply be that we havent found all species of the past yet. but still it seems logical we should have more.

    Please identify a single insult in any of my posts to you. I am making observations, each of which is readily demonstrable.
    i consider a comparison of me and lackdasial a direct insult. He is stuborn and wont change and is just stupid. Im stuborn but is willing to agree on any evidence if its overwhelmingly against my current knowledge/idea. But bieng told to look it further up do i not take as a insult
    I am zelos. Destroyer of planets, exterminator of life, conquerer of worlds. I have come to rule this uiniverse. And there is nothing u pathetic biengs can do to stop me

    On the eighth day Zelos said: 'Let there be darkness,' and the light was never again seen.

    The king of posting
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  22. #21  
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    Quote Originally Posted by Zelos
    i consider a comparison of me and lackdasial a direct insult.
    Ah, well you mayhave a point there, but I can't fully agree to that without it indirectly insulting lackadaisical. :?
    However, the comparison did at least (apparently) have its intended effect of shocking you awake! :wink:
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  23. #22  
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    "WAHT"->"DAMN IT"->"REVENGE"


    Ah, well you mayhave a point there, but I can't fully agree to that without it indirectly insulting lackadaisical.
    youre right there
    I am zelos. Destroyer of planets, exterminator of life, conquerer of worlds. I have come to rule this uiniverse. And there is nothing u pathetic biengs can do to stop me

    On the eighth day Zelos said: 'Let there be darkness,' and the light was never again seen.

    The king of posting
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  24. #23  
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    i dont know ... will one day human race will be exctinct?
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  25. #24  
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    depend on what we do. we stay here. most likly. if we leave earth. most likly not. then we will probebly change appherens(right?) throu genetic manipulation or natural evolution

    atleast this is how i think it would go
    I am zelos. Destroyer of planets, exterminator of life, conquerer of worlds. I have come to rule this uiniverse. And there is nothing u pathetic biengs can do to stop me

    On the eighth day Zelos said: 'Let there be darkness,' and the light was never again seen.

    The king of posting
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