Ecological Succession: Nature’s Great Grit


Captioning is on! To turn off, click the CC button at bottom right. Follow the amoebas on Twitter (@amoebasisters) and Facebook! We love Disney movies and we have to say—Lion
King is one of our favorites. And like a lot of Disney movies, it has a happy ending. We’re
not going to give spoilers just in case you are one of the few people left in the world
that hasn’t seen the Lion King— go see it —but at the end of Lion King, you start
to see all this life growing back. The sun comes out and all these plants start growing.
Happy music plays. The animals that had disappeared start to come back! I never really understood
where they went but…they come back! And being a biology teacher, everything is
destined to have a biology reference. So here’s what it reminds me of: ecological succession.
Although, the movie is kind of like ultra fast impossible ecological succession. It’s
not that fast in real life. Most dictionaries define succession as the
following of one person or thing after another in an order or sequence. Well ecological succession
is that but in terms of ecology. Ecological succession is a process—over time— of
organisms in an ecological community. What’s a community? Well in ecology, we have different levels
of organization. We have a living organism as our first level. A hippo for example. Then
we have a population, which is when you have the same species of an organism in a given
area. For example, a population of hippos. Same species so that’s one population. Then
we have a community. A community includes many populations living together in a particular
area. So now we have hippos, lions, giraffes, and don’t forget plants because those are
populations too. Trees and…shrubs. All of this together is a community. That’s where
we are going to focus for succession. There are more levels beyond the community level,
but this is our focus right now. There are two types of succession that we
will talk about. One is called primary succession. In primary succession, the area this is happening
in is brand new—well in the sense that you’re usually talking about an area that doesn’t
have any soil. So this usually has to be a special circumstance. An example could be
a volcano lava flow that now has left this new area with no soil present. Usually you
have a pioneer species, which is a name for the species that colonize first. It sounds
exciting…pioneer species in primary succession can be organisms like lichen. Who doesn’t
like lichen? Ha…if you are unsure about what lichen is…google it! It’s very likely
you’ve seen lichen before. Moss is another potential pioneer. After pioneer species colonize
the area, they slowly break down rock into smaller, more plant friendly substrate—and
over time, contributing more organic matter in newly formed soil which will support plants.
Small vascular plants like grasses and plants that you might consider “weeds” can come
in. Shrubs can follow. Then trees. Animals can move into the area. How long this takes
can vary…but it’s often hundreds of years before you get a climax community going.
And if you’re wondering—why this sequence? Why doesn’t it just stop with grass? Well,
keep in mind that as other plants come in…bigger plants…you are going to see more competition
for space and resources. Think about how it would be by the time trees come in! Trees
are going to block some of the light that small plants underneath them may be dependent
on. As new larger plant species come in, this competition brings about a new order. And
if you are wondering—where did these plants even come from? Well there are so many ways
that seeds can be dispersed—wind, water, animals. Check out our plant reproduction
video for more information about how these plants could have actually come into the area. Now for secondary succession. Similar to primary
succession, it follows a typical ecological sequence. With secondary succession—I like
to think second—because it’s like a “coming back again a second time.” What I mean by
that is usually you’re talking about an area that once had plants and animals and
a full ecological community going on. But then we had a disturbance…an ecological
disturbance…like a forest fire, a flood, a tornado. Actually it doesn’t have to be
a natural disaster—human activity can be involved with secondary succession. Regardless
of the type of event, in secondary succession, the soil is still there and that’s kind
of the big key point here, because your pioneer species will actually have soil to grow in.
That means your pioneer species in secondary succession will often be small plants as there
is already soil present. Secondary succession will then follow a similar sequence to primary
succession after that point. Since secondary succession involves soil already being available,
it is more likely to be a faster process than primary succession. An important thing to remember about ecological
succession is that it really shows the diversity of organisms—the sequence we had talked
about— in an ecological community over a period of time. Usually a long period of time.
Ecological succession, over time, can support an ecological community that continues to
increase in biodiversity. And, biodiversity is a beautiful thing. That’s it for the
amoeba sisters and we remind you to stay curious!

Comments 100

  • Disleiked for not enuf quikscoping

  • Watching this in pollard

  • could you make a video about sexual and asexual reproduction in cells

  • Oh my gosh!
    This helped a lot with my project, and it's extremely kawaii and fun to watch!

  • WHAT IS THIS NIGHTMARE

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  • wow! this is so helpful! thank you so much!

  • Animals rock

  • so even its lava Life can evolve from there too??
    Thats Real Magic by God I guess 3

  • For clarification, and since you are Disney fans, have you seen the Disney version of THE HUNCHBACK OF NOTRE DAME at any point? GREAT MOVIE!!!

  • Hey! i dont know if u already have, but can u make a video about symbiosis

  • Guess what…

    you have failed this city

  • Native plants help the environment. I showed that in my short documentary, "Diane's Prairie," at https://www.youtube.com/watch?v=BAGQ7sppeL4

  • My teachers have always used your videos to teach in class ever since 6th grade.. I'm now in high school and they're STILL using your videos! I really love your videos because they're educational and VERY entertaining! I subscribed to you just to see the humor in every video and educate myself even though I don't necessarily have to :3 you both are really great and I love your videos!! Good job and hopefully you'll keep making more!

  • sucCESSion

  • funny animation!

  • I LOVE LICHEN!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

  • I haven't seen the Lion King. Somehow, I know the entire story. Thank you, world. ^^

  • Haha "Vive La Trees" XD

  • Really cool even though imma a kid dont tell anyone about dis comment……. cool video

  • Can you make a video on biotic and abiotic factors?

  • LOVE THIS

  • The purple Amoeba sister's face on 2:56 got me.

  • Amazing video, it taught me a lot about Ecology.

  • @amoebasisters u r doing a great job by clearing up our doubts…..
    loved ur videos 😚😚😚😚😚

  • Like a Moss…

  • I love your videos im studding for my tests and you helped me all the way thank you

  • I hate heartless humans…

    Does anyone only see humans and no humanity??

  • stop just please stop my eyes

  • 誰か日本語字幕を頼む。

  • This is a really good resource to use for high schoolers. Thank you.

  • I hate science

  • shoutout to my biology teacher…take some notes honey😏

  • I'm happy that the world has good teachers like you! 😃
    Love from India ❤

  • anybody know how to train a horse in minecraft!?

  • I hate thes videos

  • I thought they all died, and went to the place where people that don't see the classics go

  • Good videos but the teacher still doesn't know how to teach in an engaging and interesting way. Therefore i still cant learn anything

  • Shoutout to Vannoy’s class!!!

  • Very cute video…… With lot of animation…. Very helpful ….. Make learning easy….. 😍😍😍

  • those 88 nerds still not get it.

  • READY TO GET TRIGGERD

    Read More

  • Shoutout to my science teacher

    with a sub today😑

  • A baby could sleep listening to her explain this… That was amazing…

  • can an Avatar Unlock a rinnegan?

  • Vary Gud vi deo

  • dislicked cuase my teachare give me 18 vidoes ot wetche and these one of thsoo…

  • Boiiiiiiiii

  • Lichen Moss

  • Watching this from science class

  • Oh my gosh your videos are incredibly cute. I am having to do my high school biology course over the summer and am so glad I have these videos to help me!! You guys are awesome!!

  • Amoeba queen

  • Finest explanation

  • you need a better mic, the voice recording clicks get me very distracted

  • I love you’re videos so much

  • The videos are so nice but the worksheets are kinda difficult

  • Good job on the eaditing of the video!

  • I was huns in our school play and like ima girl so everyone gushed over how cute it was lol

  • Anyone have mr Torres I need the answers

  • i love the lion king

  • This is why i use adblock plus

  • I love Lion King!

  • Like if your from grundys class

  • I Love This Video
    Click her – #SEEO. CLASSES

  • I hate this.

  • love this video

  • I think I died a little while watching this.

  • My teacher showed me this in science😀

  • Dat face doe on 2:53

  • Well kinda nice

  • Anyone watching in 2019?

  • dont press read more

    l

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  • sub to pewds plz

  • make a video of fortnite you bot ski

  • what up

  • yeah boi

  • looks like plant is dabbing at 5:16

  • Whyyy is this a thing

  • I don’t like watching amoeba sisters but my school forces us

  • I hate lion king tho😂

  • Am I the only adult that loves 'amoeba sisters' because of their animation?

  • Soggy

  • We want… a shrubbery!!!

  • These videos are so helpful for biology! Thank you so much for making them, they help me so much in school

  • 3 minutes in and I'm really 'lichen' this video!

  • 2:27 Childhood in a nutshell

  • Im going use this in classroom

  • hi people in bio class

  • One thing I have learned after watching this video is we have to explain as well as show some clips like she did. Its so easy to learn and hopefully I might not forget it.😁 tq ma'am for the video. I got exam tomorrow so came here searching for a good video and it really help me out. Tq once again.

  • Who’s here from bio class?

  • Got a final in 35 minutes so

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