Population Ecology

Logistic Growth Video - • Logistic Growth
012 - Population Ecology
In this video Paul Andersen explains how population ecology studies the density, distribution, size, sex ration, and age structure of populations. Intrinsic growth rate and exponential growth calculations are included along with a discussion of logistic growth. K-selected and r-selected species are explained along with survivorship curves.
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Intro
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Artist: CosmicD
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Creative Commons Atribution License
Outro
Title: String Theory
Artist: Herman Jolly
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All of the images are licensed under creative commons and public domain licensing:
Agriculture, U. S. Department of. Whooping Crane in Flight in Texas. USDA Photo by John Noll., March 18, 2011. Flickr: 20110214-USDA-JN-0001. commons.wikimedia.org/wiki/Fi....
“Bird on Branch - Free Animals Icons.” Flaticon. Accessed September 15, 2015. www.flaticon.com/free-icon/bird-on-branch_61289.
“Canada Lynx.” Wikipedia, the Free Encyclopedia, July 25, 2015. en.wikipedia.org/w/index.php?....
Headquarters, U. S. Fish and Wildlife Service. Adult Whooping Crane (Grus Americana) with Chick., February 23, 2012. Adult Whooping Crane and Chick. commons.wikimedia.org/wiki/Fi....
Husthwaite, Ray. English: Survivorship Curves, 23 April 09. Own work (Original text: I created this work entirely by myself.). commons.wikimedia.org/wiki/Fi....
Karine, Gill-Weir. “The Whooping Cranes: Survivors Against All Odds,” n.d. www.prairiefirenewspaper.com/2....
Robertson, D. Gordon E. English: Snowshoe Hare (Lepus Americanus), White Morph, Shirleys Bay, Ottawa, Ontario, Canada, January 21, 2013. Own work. commons.wikimedia.org/wiki/Fi....
Sasata. English: The Whooping Crane, Grus Americana at the Calgary Zoo., September 11, 2010. Own work. commons.wikimedia.org/wiki/Fi....
“Standing Up Man - Free People Icons.” Flaticon. Accessed September 15, 2015. www.flaticon.com/free-icon/standing-up-man-_10522.
“Tree Silhouette - Free Nature Icons.” Flaticon. Accessed September 15, 2015. www.flaticon.com/free-icon/tree-silhouette_46564.
“Turtle Shape - Free Animals Icons.” Flaticon. Accessed September 15, 2015. www.flaticon.com/free-icon/turtle-shape_47331.

[@aysalasaysalas8040]

I was NOT ready for those rabbits to burst up in flames

[@joeyama2259]

same

[@blokshredder1276]

same

[@skylerbrooks2911]

😭🤣🤣🤣🤣

[@chanlu4602]

You're like a father to me

[@hamedhosseini4938]

lol

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Better to say "You're like a father figure to me"

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Chan Lu true

[@kurimiaisukurimu]

Biologically no

[@Sofia-es9de]

you're like a teacher to me

[@plasmasheep4098]

I don't comment too often, but thank you Mr. Anderson. People and educators like you help the world so much, and just having one good teacher ins something can provide a spark of interest in a topic for many students. Almost anyone can have a great teacher in their lives thanks to someone like you and it's just great. thanks

[@michelleross1205]

Last minute cramming for a bio final and this was so useful!

[@t4y_b0t]

How did you do?

[@oliviajanusz8671]

Excellent run down on all of the concepts that I teach for Population Ecology for my year 10s and year 12s! I love how you just get to the point and tie everything together so well!

[@heatherhaas5736]

Thank you for these awesome videos. I am not sure if my students love them but they are a true treasure for a teacher. Used them for supplement lectures when I was on maternity leave. Great teaching!

[@eloymarcelo2578]

Thank you very much Mr. Anderson - Bozeman Science, for the videos you've shared here in TH-cam. I used those as references as part of my online class instruction and helped me explain the concept of topics that I discuss with the class. I never re-posted your video as not to infringe copyright. Thank you very much, the student understood the topics easy-peasy.

[@walruswithebola1199]

My AP bio teacher is clueless and legitimately doesn't understand a lot of material she gives us, so a friend of mine who had the class recommended me to you. I am now more confident in getting an A, thank you sir.

[@Adsmcv]

Thank you Bozeman! That was an awesome video and really accessible. I'm going to recommend it to my classmates.

[@amberreid1049]

You saved my life 😭 king of teaching!

[@dahabohussien7184]

What a great teacher, you are born to do this! God bless you!

[@000Shaihulud666]

Thanks, Teach! I'm just an average guy trying to learn what the "rules for life on earth" are. This was helpful

[@neelams_alchemy]

thank you, so clear, and yet detailed. awesome work, keep it up!!

[@kacey_donner]

That was so helpful. Thank you for the free education. Much needed.

[@rongsrongs7438]

doing my teaching practicals, and this gave me a full proper lesson.... thank you

[@sheydsgn]

Intrinsic Growth Rate. Slay!
👏Thank you, teacher!

[@dereklang3335]

Who else had to read this for science class?

[@ricky-leedaniels9051]

Thanks, this was really helpful. Concise and informative. Hope we see more of your videos on ecology.

[@francissape1838]

Thank you for this sir. Finally found an excellent reliable source. God bless you.

[@ameeraamoora]

mr.anderson saves me when I'm last minute cramming for AP bio tests!!!! THANKS MR.ANDERSON

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I find all of the videos helpful and interesting. Thanks in advance for making more

[@kinzeesh]

Thank you for your information!! I really appreciate it!!
Right now processing A LOT of information at once, and so might have to rewatch more than once to fully absorb because you gave A LOT to process, very concisely.
But I hope you continue to make these videos accessible to people because I believe we all should know, as part of deeply knowing ourselves and where we fit into the world, with deep consideration.
Thank you!! 🌞💖

[@kendo512]

These are really good supplements to uni lectures. Thanks

[@idria2736]

I'd lke to transfer my professors salary, house, and car to this man.

[@john3006in]

Thanks Mr Anderson, ur a wonderful teacher.

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[@mus1307]

so well expained thanks to the cool animated drawings and a structured tree to understand. Thanks a lot =)

[@Jader7777]

So well put, thank you so much for this video!

[@hannahoconnor4083]

not normally a big fan bc I'm from england so normally your vids sort of apply to my work but not a lot, but this was amazing! So so helpful.

[@matthewzuelke6721]

10:17 people die at the end of their lives. Insightful 👏

[@glaucusyellow]

I know 😭

[@jujujoestar9882]

No shit Sherlock

[@howardtian3345]

I loooove this guy, his videos do help me a lot!

[@calebmolenda9588]

Lol I like how you made this amazing concise video then at the end say "hope that made sense!"

[@JosephChalamanda-zt3gk]

It's really awesome i had some difficulties on understanding population ecology but now its walk over

[@MichaelClark-fp4hd]

Hey Mr. Anderson, this is the most video like ever

[@409raul]

this is was so awesome. keep it coming!

[@mjapanyishengoma1764]

thank you for a wonderful presentation. I have learned and enjoyed the video.

[@milkman9314]

I did learn from this video. i really appreciate it. these videos help me in my school

[@brandonworthn]

Shoutout anyone watching this for ENVR SCIENCE from GC 🥳🥳

[@WolMaror-wi5ly]

Thank you so much indeed, this video has helped me a lot.

[@debanjansarkar]

So nicely explained. Thanks!!

[@venkataramana3304]

Wonderful and easily understood video sir. Lot of thanks

[@1chaitanyakapoor]

Good Stuff ! Thank you for making these videos

[@underthibo9354]

you just saved my exam, this is all i needed to pass my exam and got an A on my exam, thank you so much!

[@chasej1456]

Haha I could stop going to class way better than my hour long lectures! Thank you!!

[@CleverGrace]

thanks alot MR. this was really helpful

[@Dr_Ali.Aljboury]

Thank you very much
It's damn amazing explanation and he makes, you learn so fast

[@francila09]

Thank you so much!!! This was very helpful! :)

[@livingonmars6405]

omg thank you! so needed!

[@shalinirajakaruna3615]

Awesome explanation!

[@Magic_beans_]

I remember when I first learned this back in the 90s. We were still under the sway of “The Population Bomb” and similar fretting about overpopulation. In my high school class the teacher showed the k chart and the r chart, and next to that the human population, leaving us to draw the “obvious” conclusion. A few of us contested, as you did here, that the sigmoid also looks exponential for a while.

[@justastrawberrymonst]

Thank you for the video! It's funny you posted it and I have an AP bio quiz on this later today lol

[@letslearntogether879]

Sir Thank you so much you cleared my all confusion.....

[@RooralAUS]

Very helpful and educational thank you!

[@Jonasgirl156]

Super helpful! Thank you!

[@Ribstugs94]

clearly explained!! thank you

[@rashmibhattacherjee1818]

Too awesome sir 🙏🏻👏🏻

[@vidya.v]

Thank you! That really helped.

[@jeanettequintero2313]

Thank you! You’re the best

[@dahliashahbuddin5501]

Fantastic! thank you sir❤

[@Sulovesu11]

thank you so much! very helpful

[@farahliana807]

Thanks sir, I have final test this afternoon!

[@dontxarebear8683]

Freshman in highschool taking a APES unit test covering the Cycles,Ecology, and Evolution and this guy taught me Ecology in 12 minutes then I could by myself in 3 hours THANK YOU XDXDXD

[@muskduh]

Thanks for the video

[@user-uw4go6vz4n]

You are awasom.
Thanks!

[@pragatinanda37]

Thanks... It's helped a lot.

[@GCanasValle]

Great job!!! With a touch of drama, for example with the rabbits in flames, that hit the spot in the audience.

[@johntindell9591]

thank you so much

[@lynxbay403]

Thanks for the video. Needed it for science. 😀

[@1adamgarcia2003]

Excellent, thank you.

[@bryanttokarz5965]

great vid bro!!!!

[@vanglearnstocan6149]

Mr Anderson saving my useless bren cell once more

[@vanglearnstocan6149]

Wow I can't believe this just one week ago we're now into ecosystems as a complex system it's killing me

[@toastermax1]

Thank you very much!!

[@margytyler9039]

Yep still useful studying for my Ecology exam eeekkkkk.... thank you

[@zumana59]

thanks that was really helpful

[@johntindell9591]

Very helpful thank you.

[@beckywalton359]

Hi, this is a really helpful video. I followed it all really well, but can you just explain why r = 0.5 in the exponential growth example?

[@Dante-dq7ye]

Thank you so much :D

[@Aj-jw9jk]

that was really helpful

[@johntindell9591]

Thank you so much

[@philiciaharding8408]

Thanks very much sir

[@linusshanley9949]

When a population reaches its carrying capacity growth levels off, using the term limiting factors and what you know about limiting factors explain how this might occur within a population of field mice.

[@cristobalgarces1675]

How are we supposed to do the population growth stuff without a calculator. This is almost the only thing I cannot do in AP Environmental Science.

[@subshomegreenhiskills]

You are always given tables, which you can use to input r and t

[@annem7262]

thank you

[@TeaCupLady]

Thanks so much

[@ganeshsavanur9541]

Thank you soo much

[@alangamer2017]

Thanks so much man

[@biowallahmvsir8783]

Nicely explain concept of biotic potential exhibited by Different species populations ...thank

[@eshachatterjee6454]

IT WAS REALLY HELPFUL FOR MY UPCOMING ZOOLOGY EXAM. AFTER A LOT OF DAY I COMMENTED ON SOMEBODY'S VIDEO, THIS LECTURE WAS REALLY AMAZING.

[@abhishekbhardwaj1901]

It was much helpful 👏👏👏

[@user-nl5yt1rq9x]

Nice sir... doubts are cleared

[@mediumbug]

Thank you!!

[@owengeier7770]

so helpful.

[@abdulraheemanumah7731]

This man is brilliant

[@allisonbenjamin6020]

This guy is such a chad. Best bio teacher ever

[@rinanalu8787]

Correct me if I am wrong but I think that the sea turtles should be a type 3 since most of their young die at the beginning of their lifetime when making their way from the sand into the water.

[@calebmolenda9588]

I would confer.

[@tylersickler7672]

Yes, but if they survive, they go on to live very long lives! Like humans.

[@vibatkevin]

You are in fact correct. The mortality rate for a sea turtle in their juvenile years is higher, than that of after they have become an adult.

[@karanbisht248]

this is a survivor ship curve and what you are talking is about are mortality curves. sure many juveniles will die but the no of survivors in that population will not go down as the adults have very long life. so we get the type 1 curve

[@siobhanbradley9244]

Bit late to this but sea turtles have a type 3 survivorship curve. Not a type 1. Out of all the individuals born in turtle populations only a small percentage of them survive to adulthood, but when they do they have a very low mortality rate when they are adults. Humans have very low mortality rates their entire lives, most babies born today survive to adulthood and with increasingly better healthcare adults live until very old age

[@user-bz8nm6eb6g]

Thanks!

[@amiradarwish8917]

Thanks alot of ♥️

[@IAKhan-km4ph]

very nice

[@madhumitashindhe8987]

namastey sir ... thank you so much ...

[@coeworld7344]

Nice guru g 🙏🏻

[@alisonbresnahan9561]

Why does the exponential growth equation (Nt=N0e^rt) produce a different population size at a given time than what a spreadsheet produces? If I create a spreadsheet like you did in the other video with the rabbit population, and use an r value of 0.25, my calculations derived from adding the population increase to the population at a given time matches the spreadsheet values exactly. However, when I use the growth rate value of 0.25 and put it into the exponential growth equation (above), a different value is produced. For example, at t=4, the two values produced are 19.53(using the equation) and 21.53(using the spreadsheet or just adding the population increase from t=3).