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Ecological Succession

Added Mar 28, 2014 •

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Highsmith Aniston and in this podcast I'm going to talk about ecological succession what is simply a series of events by which life comes back in so what am I talking about well look here we got a picture of a forest that this is a year after the forest fire until you can see a lot of a charred burnt trunk it's a basically a photographer came here and he came here once a year to the same place and took searching for the year one to be year 2 Destiny year 3 year for  demure so basically you want me to see is Life coming back and changes taking place and that is called succession and it tends to occur at connectable rate in the number of predictable species in the basically succession we could break into two different parts the first one is called primary succession succession occurs when you have bare rock in other ones when there's no soil left and put you look at this lava flow basically the lava flow down here you can see when it cut a footpath here but basically Life is starting to come back like can't grow out here for the most part because there's no soil there we can't have plants that start to grow their so we have to have a rosin with that wind and rain and eventually we have soil and then we can start up plants come back another sample of primary succession is right here Intermountain Helens the day before it exploded **** exploded it looked his Clinic of it until here in Montana we had about that much **** everywhere just came from the top of this mountain is it exploded well this is the primary succession cuz there's no soil left it's all gone it's in Montana not in Washington since a basically sleep after we establish itself because this is a picture of Mount Saint Helens now a few years ago so this is on this kind of down this room up here what had happened a series of events by which light has come back now if you compare this to that Estonian Forest you can see that it's because we had to go all the way down to the Rock great example of this is the island of surtsey until I think this is a 1962 all the sudden off the coast of Iceland volcano in a brand new island shows up in a minute 30 which is some Norse god and so basically what scientists decided to do to not go there a few scientists will go there every year it's basically the study how life comes back until you can see all this vegetation on this island and there's in weathering going on images of just a regular Island really not that old answer the cool thing is they can see what species are showing up first it didn't take long for vascular how to show up and make inhabit get dinner while lot of them are blown by the wind or carried by birds or float there since it's pretty cool but all of that again is secondary succession in this is a gorgeous picture that was taken here in Montana during a forest fire secondary succession occurs when you have some kind of disturbance but the will still remain the burning fires that something that's really common in the mountains and so you can see this LG or after that fires in Yellowstone Park and there's no but what you should know is it the soil is sitting there and life is ready to come back it's basically this is what Yellowstone Park look like a few years later and then looks like gnats what were some of the first organisms to come in when we called eating Pioneer organism and Pioneer organisms are going to be organisms that tend to make their morning by coming into an area after there's a disturbance in the two examples in Montana one would be Lupin Lupin is going to be a flower it's actually a legume related to a ping what a nice about looping is that it can fix nitrogen has bacteria that live on the truth and they can actually take nitrogen in the air and return it to the soil then another example D Blackpool Hines Lodgepole Pine are really skinny and long Conifer trees that we have here in Montana and basically what they do is they have two different cone there certain cones that they use your the year to reproduce but they also have these really waxy water culture rottenstone and then they never open left there's a fire there's a fire than open up and then their fees will come back it's a basically Lodgepole Pine have evolved the way to be a pioneer species to come in now eventually as that for starts to develop going to be replaced by more climax DC and so that's another term that I just that's called the climax climax and basically what's going to happen after succession so on this side will have a disturbance organ of a disturbance so what are some disturbances we could have fire or human disturbances or like a tsunami on a really cool disturbances after Chernobyl melt down there all humans had to leave until it's a wild kind of a land but basically life can come back and how does it come back will look look at the chart which is great to be like a bear bear rocks going to be the first thing that you have and you matter bear rock is going to drop off at vegetation of course Chris to come in next will then we can have moss in grass is come why don't they right away well what time do you have to have weathering rain wind soil and then they can come back they just have a huge amount of grasses both you think about it as the other species start to take off their going to be taller than those grasses they're going to start to take the sunlight from there will be replaced by other species which is eventually we're going to have some small wooden plan and then we're going to have some trees to be like The Logical Pine and eventually we have to so what happens if Anjali everything kind of levels off and then we have these Climax and he's at the end does it stay like that forever well it depends so if you're like a redwood tree you're big enough this fire sweeping through an area is not going to affect you but most PCS are going to be killed by a disturbance and then that whole process Joker against the what is succession is the series of steps by which light comes back remember there's primary secondary primary no soil secondary soil

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Ecological Succession

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