Biotic and Abiotic Factors

020 - Biotic and Abiotic Factors
Paul Andersen differentiates between biotic and abiotic factors. He explains how both abiotic and biotic factors can affect organisms at the level of the cell, the population and even the ecosystem. The complexities of biofilms, predator-prey relationships, and food webs are given as illustrative examples.
Do you speak another language? Help me translate my videos:
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All of the images are licensed under creative commons and public domain licensing:
"File:American Beaver.jpg." Wikipedia, the Free Encyclopedia. Accessed November 18, 2013. en.wikipedia.org/wiki/File:Ame....
"File:Biofilm.jpg." Wikipedia, the Free Encyclopedia. Accessed November 18, 2013. en.wikipedia.org/wiki/File:Bio....
"File:Canadian Lynx by Keith Williams.jpg." Wikipedia, the Free Encyclopedia. Accessed November 18, 2013. en.wikipedia.org/wiki/File:Can....
"File:Fuzzy Freddy.jpg." Wikipedia, the Free Encyclopedia. Accessed November 18, 2013. en.wikipedia.org/wiki/File:Fuz....
"File:Mandibulartori02-04-06.jpg." Wikipedia, the Free Encyclopedia. Accessed November 18, 2013. en.wikipedia.org/wiki/File:Man....
"File:Mauna Loa Carbon Dioxide Apr2013.svg." Wikipedia, the Free Encyclopedia. Accessed November 18, 2013. en.wikipedia.org/wiki/File:Mau....
"File:OPAL TERRACE with Elks.jpg." Wikipedia, the Free Encyclopedia. Accessed November 18, 2013. en.wikipedia.org/wiki/File:OPA....
"File:Reintroduced Wolves Being Carried to Acclimation Pens, Yellowstone National Park, January, 1995.jpg." Wikipedia, the Free Encyclopedia. Accessed November 18, 2013. en.wikipedia.org/wiki/File:Rei....
"File:Salix Alba Leaves.jpg." Wikipedia, the Free Encyclopedia. Accessed November 18, 2013. en.wikipedia.org/wiki/File:Sal....
"File:Snowbowlaspens.jpg." Wikipedia, the Free Encyclopedia, November 17, 2013. en.wikipedia.org/w/index.php?t....
Intro Music Atribution
Title: I4dsong_loop_main.wav
Artist: CosmicD
Link to sound: www.freesound.org/people/Cosmi...
Creative Commons Atribution License

[@lexrunner408]

This man is the guru of the ap biology community

[@sierralobo7163]

Thank you Mr.Andersen! You're the main person A.P. Biology class goes to for help. Your videos are amazing and easy to understand.

[@reetta1142]

We have been watching these videos in a Finnish upper secondary school on two biology courses which we're able to take in English. The videos have helped a lot not just with learning about the different aspects of biology but also with the learning of the different biological concepts (in English) and how to use them to explain these things in English. Thank you for these videos!

[@almoststatic6294]

Our class teacher referred us to this video in our lesson to make notes, and I'm not complaining. This is a great video and covers everything I need to know in a great deal of depth, especially since I am a triple science student, this really has helped me. Please keep doing what you're doing; it does have an affect on us and it doesn't go unnoticed.

[@Sweetcupcakes23]

one of the best teachers so farr!!!!! thank u so much

[@Neeboopsh]

as always, fabulous work mister anderson

[@Okaygrandma]

Thank you for this video it helped me alot with my studies

[@cristinalaskar8829]

Thank you for this!! So... How do we alter the biofilm scenarios, say in one's mouth? I know some folks who cannot figure out their sinusitis situation!!! I'd love to be able to share - specifically something natural! Though, I'll figure out the natural if you tell me how to affect the biofilm...

[@TheSalHanen]

Like the other dude said "your just explained that to me in a way I can understand" that was awesome man.

[@gigibunny]

you just taught me so much! You have no idea ! i felt like my biology professor was teaching us all this in a very indirect way and I couldn't understand it but you just made something that was so abstract to me concrete ;p thank youuuuu !!!!

[@mastaan2301]

it's be nice if he could summarize the lesson at the end because i use his videos to write notes and study but i cant write down everything he says. i seem to have trouble finding the key points....

[@thespeedyyoshi]

Part of it is just developing the skill of summarizing. It takes time.

[@javierhenderson3543]

haha

[@songnghi1315]

Masta An yeah me too

[@wynniel2891]

thanks so much!!!

[@DeathThemself]

Brilliant! Thank you so much!

[@mohammadasim1761]

Very nice

[@eazyninja6190]

Wow such good vid

[@nvmsviewsofyouth]

Can you tell me what programs/applications you used to shoot this video? Thanks so much!

[@RotatingMagnetGuy]

Welp I guess it's time to go brush my teeth now *shudders*

[@Rosaliepayne]

He is a lifesaver :)

[@greciagarcia5016]

On what app did you do the video?

[@lmaoghost4932]

Try paint tool sai or ibisPaint

[@Zinckanator]

3:27 ew that nasty stuff is on our teeth.

[@AmirAlamara]

why did the elk population go up if wolves are feeding off of them?

[@diaverna]

Amir Alamara Ikr, but maybe they started mating more or something.

[@TwoAwesomePeopleTAP]

Amir Alamara I think it'd likely be a combo of multiple things. - As lotus said previously, it seems possible that the elk reproduced more to counter the increased mortality from predation. - they likely decreased in number at first, then once natural selection allowed those that had traits better suited for an environment with predators to start increasing in frequency by reproducing successfully, the elk population increased until the wolves adapted to counter the elks' traits. Examples: better antlers or hooves to defend with, faster metabolism, legs a better length to flee; a lack of evolutionary pressure from predation meant that, once predation DID start anew, some of the traits present would be detrimental to survival and selected out, so the population would (mostly) expand from the now-fit traits. - as mentioned above, there was likely a decline in elk population at first. This would have allowed the previously-dwindling populations of the elks' food to recover, and the elk population would increase again as its food sources did. Hope this was insightful! - gryphongirl

[@javierhenderson3543]

Since the wolf population decreased, the elk population increased. It seems that he messed up on his wording.

[@msmcmuffin586]

HI NARA!!

[@knepsis]

same here

[@JaZzieL0]

No entiendo nada pero tengo que verlo...

[@noobyrice2346]

this is cool 😃😃😃

[@Smitty231009]

Where can I find the video worksheets?

[@lorcresiakonopasek9793]

The petraphyde forest is scared solid? ي

[@kenzy_2289]

when everyone is commenting about AP bio but your AP environmental science teacher sent you

[@mattelumacas8129]

Do you have a math lesson?

[@grotch9257]

Watchin this in AP bio rn I hate my life

[@SamWor]

mr cantrells class where you at

[@user-oh5tm8qo4m]

o_o

[@user-oh5tm8qo4m]

@Aaliyah Aiken no, not even a little

[@abelilas6835]

Great

[@whiteoakpublishing]

Great video...except isn't it pronounced "coyote" with a hard 'E' sound at the end?

[@cherrybomb2015]

this is such an old comment, but coyote has a variation of pronunciations depending on the region!

[@AlwaysLoudAA]

Mrs. Huisinga's class! What UP!?!

[@Tundratiesfishingco]

lynx don't just feed on hares. There feed on rodents, too.

[@prestonnguyen572]

you spelled Barro* wrong dawg....

[@jellyfish5725]

bro has been mewing since 2011😍😍😍

[@lillyious]

thxs

[@xiiixiiih.16]

🍎

[@Sp0okeh]

gud vid

[@kevinfeng6700]

Kai-yotes

[@KiiDSkiiLLz]

Mrs.Wisneski class anyone

[@brutty100]

Mrs Browns class mang

[@KarliG1998]

omg i understand now...

[@calebbalcita6568]

In Northern North America lol.

[@abelilas6835]

Mr Dwyer

[@SNORLAXisBAWS]

hey preston who do you think i am

[@pigopal3]

zannotti

[@adiamondprincess]

@Loai Hosheshi lol

[@linjas123]

63 Days!

[@lorcresiakonopasek9793]

Pollyanna are so cute , but how can we get them to somewhere safe?

[@lorcresiakonopasek9793]

Every life and UN life you explain are so cute. Are they dropping off because there eating each other

[@user-ii1vj3uv3p]

How many people are watching this video just because of their biology class?

[@guoxin3153]

middle school because of my science class

[@songnghi1315]

Oh me haha, i have a biology class online today and my teacher required us to watch this.

[@MetalManWario]

watching dis for class ahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhggggggggggggggaaaaaaahhhhhhhhhhh >:| stop babbaling already

[@Okaygrandma]

You are all so little minded and immature. As if anything you say matters lol this video is educational

This video is inaccurate when describing the main diet of Gray Wolves and contributing to the spread of misinformation, which in turn leads to an imbalance in ecosystems. The main diet of Gray Wolves is in fact, not cattle, but their natural food source, elk, among other mammals. By suggesting that Gray Wolves feed mainly on cattle you are emboldening individuals to kill wolves when wolves are desperately needed in our ecosystems. The reality is that wolves have a minimal impact on the cattle industry, but the industry continues to insist otherwise despite evidence to the contrary. If you are going to make videos, please try to ensure they are factually correct.

[@noah_a_j4615]

Bruh global warming increases and decreases across years lmao this guy is a teacher?

[@Stevester117]

MS. BRYSON'S CLASS!!!!!!

[@jenniferhulak1614]

Liberal.