Population Ecology: The Texas Mosquito Mystery - Crash Course Ecology #2

[@147258GS]

Dude keep this up. I'm loving this. I'm 51 and just started to get really interested in science since high school. Your comedic, rapid, informative style is a winner!

[@adamkazmar8629]

bro u r 2 old to be on youtube

[@ok-qc5ry]

That Kazmar Kid That Kazmar Kid Bro, he just wants to learn

[@delphineandsophie445]

yeah its awesome that he spends time watching these videos to learn rather than being annoying to other people in the comments

[@jimsupelana4957]

Glenn Sharp thats my dad 😊😊

[@PajamaJazama]

Good for you mate. I hope I'm as willing to learn at your age

[@fixiesandrainbows]

It really hit home when he said the human growth curve will slow down due to something like a pandemic 😭

[@thomasg690]

Nobody: People in the comment section: mY tEaChEr mAdE mE wAtCh tHiS

[@aquasparx4015]

same

[@gilbbyoutdoors]

I'm watching this to learn on my own. Yes I'm a geek 😤😤😂

[@tayk-47usa41]

im watching for fun

[@lydmonkey4593]

@@gilbbyoutdoors same! well kind of. I was never told to watch this instead of read an article.

[@kseriousr]

@@gilbbyoutdoors Got my degree three years ago, finally learned that learning is fun, so here I am 😅

[@tessa4181]

7 years ago: “Something always knocks the population back down. Could be food scarcity or an epidemic” May 2020: coronavirus PANDEMIC

[@aidengamingyt5688]

Yes.

[@aidengamingyt5688]

If your watching in quarantine, This guy has kids now...

[@wvnderlust4930]

If you’re here from biology hello 🥺

[@angie-bj3kz]

yoongimuch yup👋🏽👋🏽

[@kenken3147]

hi

[@jillianj1639]

Waddup

[@taiheidoma2063]

Hello

[@enriquechaveste4840]

F

[@taylorfrench6722]

Population Ecology: The Texas Mosquito Mystery - Crash Course Ecology #2 NOTES 1: What is Ecology? 1.1: Ecology zooms out on the Earth as opposed to individual bodies 1.2: Population ecology is the study of how groups within a species live within an area 1.3: Community ecology is the study of how different species live in an area 1.4: Ecosystem ecology is the study of how all things coexist within an ecosystem 2: Intro to Population Ecology 2.1: Focusing on the 2012 West Nile Virus outbreak in Dallas, there was more than a tenfold increase in cases of West Nile Virus between 2011 and 2012 2.1.1: This was the result of a population explosion of mosquitoes, carriers of West Nile Virus, in 2011 2.2: Population ecology explains the specifics of the outbreak, such as why it happened at that time and place 3: Fundamentals of Population Ecology 3.1: A population is a group of one species who interact regularly 3.2: Population density, or the size of the population in a given space, affects how often individuals come in contact with each other 3.3: Population density increases when individuals are born or immigrate to the area and decreases due to deaths and emigrations out of the region 3.4: Additionally, the dispersion of these individuals as it’s important to know how close they actually are as opposed to an average which assumes they are equally spaced out 3.5: Fecundity, or the number of offspring an individual can have in a lifetime, make a huge difference in population growth 3.5.1: Mosquitoes can have thousands of offspring in two weeks while other animals have them less common 4: Limiting Factors of Population Growth 4.1: Population can’t grow infinitely, and rarely even reaches a full potential 4.2: Limiting factors are deduced by finding what a species needs to survive and determining whether or not it exists in sufficient quantities for growth 4.3: In Dallas, there are a lot of options for mosquito food, and it is extremely warm, especially during a heatwave in the summer of 2012 and a relatively warm 2011-2012 winter 4.3.1: Additionally, mating options were plentiful and a drought allowed mosquitoes to lay eggs in static water 5: Density Dependent and Independent Factors 5.1: Dependent and Independent Factors affect a species’ carrying capacity, the number of individuals a habitat can sustain with its’ available resources 5.2: Density Dependent Factors are determined by a population’s density 5.2.1: A population may not have enough food, water, and space to accommodate everyone, or a predator population explodes, keeping the prey population in check 5.2.2: Population density also affects damage done by disease as a population living in close quarters is more likely to spread the disease 5.3: Density Independent Factors are unaffected by population density 5.3.1: Natural or man-made disasters can devastate populations regardless of size 5.3.2: Even minor weather events like an above-average number of thunderstorms or a slightly cooler winter may also damage a population if eggs are disturbed 5.4: There are so many different factors that could lead to a population reaching carrying capacity 6: Calculating Growth 6.1: Exponential growth is common in ecological situations as species grow by multiplication 6.1.1: It’s important to note that, while population increases rapidly, something will cause growth to stop and possibly reverse 6.2: Logistic growth occurs when a population grows when constrained by its habitat 6.2.1: Logistic growth often shows a population growing exponentially until reaching carrying capacity, then plateauing 6.3: To calculate growth, first subtract the number of deaths from the number of births (if there are more deaths than births, this will be negative). Then, divide this value by the initial size of the population 6.4: While this number may appear large, note the exponential nature of the growth

[@TheBirdiebnd]

Hank, I would just like to say that as an Ecologist I would like to say that your videos, although simplified immensely, is a great way to introduce people I know (who are not scientists) to my field. Also, it is an amazing tool when teaching, especially since I teach non-biology majors at a university. Thank you for your hard work and nicely done videos!!!!

[@krybski]

Thank you so much for doing ecology. I feel that in school, unless you're really a hardcore biology major, they tend to focus on microbiology (which can be a lot of memorization and regurgitation as opposed to excitedly learning about life). Ecology is much more brain-friendly and allows us to think over not only the world, but our place in it.

[@simbasaru]

This is sooooo helpful for a review for exams or tests, i highly recommend everyone to watch crash course after studying a topic!! THANKS FOR HELPING ME GET A'S IN MY COURSES. Also, Physics crash course is seriously needed!! D;

[@jcvg2006]

Hank! I'm in an ecology class right now and we're talking about population ecology...you are a lot more entertaining and easier to understand than my professor. Thanks! :)

[@anon9359]

A lot of classmates in my school complain that this guy, and his brother talk too fast, but I think the pacing is perfect. Absolutely love these nerds.

[@nemodot]

Hank, you should do a crash course on biochemistry, taking on a wide variety of topics like inmunology, microbiology, physio-pathology, celular biology, food science, toxicology, and so on.

[@shelbykitchin]

So distracted by the fact that he was writing backwards like it was completely normal...

[@kevvie]

+Shelby Kitchin dude why can't you think that they filmed it first then make that specific part left side right and right side left

[@child9125]

+Jiung Choi Well yeah sure we can think that BUT what if he did write backwards with so much ease?? You don't know what's in his big bag of skills.

[@kevvie]

+Pippa Peep (Pippy) okay whatevs

[@alphaxwest]

+Shelby Kitchin IKR he was writing like he was born doing it!

[@13fisherman2007]

+Shelby Kitchin or it was a mirror

[@TheFireflyGrave]

'The Mating Cloud' sounds like a good name for a nightclub. Or maybe not.

[@smoothdoge9184]

TheFireflyGrave lmao

[@Nowayitsmycookie]

I'm studying environmental science and ecology at university right now, so this was a lovely reminder that yes, I do remember the fundamentals of ecology and yes, I am in the right program for me. So thanks!

[@tigermiep]

really impressed with Hank's ability to write backwards on the screen.

[@PenguinToad]

8:56 This guy saw the future with that guess of a "epidemic" .

[@StephenCook628]

I love that straight away you're into "BOOM - why the heck does anyone even care?", and actually giving an answer. Rather than the standard high-school answer of "BECAUSE EXAMS"

[@jaelynb9991]

who else is watching this for online school? lol

[@joshn0524]

me

[@stormentdark1434]

unfortunately me

[@isaiah9501]

im here proving my mom that i can learn more from youtube than those shitty DepEd Commons

[@wildmansam1]

yes. if u dont edit the comment to say "whos gay"

[@brysxn_c4541]

me kms

[@purple8990]

Hello, fellow classmates, and welcome to your homework.

[@snowflakebuttonsworld9268]

Who else can’t find the answers to their biology?

[@risajohnson5648]

rightlike one my questions is dispersion has to do with g blank a blank like what

[@snowflakebuttonsworld9268]

Maddy Household it’s stupid. I would just copy the question into google.

[@risajohnson5648]

@@snowflakebuttonsworld9268 i tried coundnt find it

[@xavigolden8287]

Exam? Exam.

[@yasminakatebi9265]

Okay?okay.

[@convergentseries3508]

Yes. Yes.

[@Wavgu]

knowledge ? knowledge.

[@novathemagus3740]

What? What.

[@joyenahamid5745]

JINX? JINX.

[@follypotter6918]

This would have been helpful when studying for the test I took today. Oh well. You and your brother have successfully helped me get through (almost) the first semester of AP Biology and AP World history. Thank you SO much.

[@thomafred]

Was about time you included some math in Crash Course. A lot of the topics discussed in crash course have some distant mathematical connection, but this one was more direct. I wish for more!

[@Official_Doge]

You guys should do an AP environmental science crash course videos. It would be amazing

[@FreeParameter]

"Hank Green the science meme"

[@thatonewhovian9758]

I love crash course so much. Hank is so easy to understand and has helped me through so much schoolwork. He's just awesome :)

[@fefalim13]

Really good summary to my exam tomorrow! Also, I realized I have a crush on Hank.

[@kamakazibob]

I find it amusing how I find the same amount of insight/time in these videos than I do during my graduate level environmental science classes. Good job Crash Course!

[@verdatum]

Anyone ever notice that when Hank needs to write something out on our screen, the part in his hair changes to the other side? ;-)

[@EstebanLau]

+verdatum and that his birthmark on his neck changes the side.

[@loganl3746]

And here I thought he was just really good at writing backwards. Good catch! And smart idea on the team's part for thinking of doing that

[@TVLovepuppet]

Such a relief to have that effect explained!

[@sweetom888]

Logan L it would have been smarter for the whole episode to be flipped. But then we wouldn't have learned as much :)

[@lucasakers4011]

I wish they would do a unit on geology

[@ccello6295]

Lucas Akers with video on the hydrosphere/hydrology 😍😍😍

[@RafaelSantos-ic9ht]

if someone is a homie answer these questions for me thank you 1. Define population ecology. 2. Define population. 3. Discuss how the following factors affect population. a. Density -include immigration, emigration, births (natality) and deaths (mortality) b. Dispersion c. Population growth - include a definition of fecundity. 4. What are limiting factors? What is the difference between density dependent and density independent? 5. Define carrying capacity. What factors affect it? 6. What is the difference between exponential growth and logistic growth?

[@skyeye21]

Why am I now just finding this channel?!?! Its so awesome and educational!!!

[@thatinsidejoke]

Im glad i can say im studying for my final by watching you tube!

[@ChesterZoda]

Economics is a MUST. John was a pro (according to him) in his younger years. Physics and Chemistry you can easily watch other vids... but economics... surprisingly there are not that much well-made vids. We need you guys Crashcourse. To make ECONOMICS!!!!!!!

[@nishantkr911]

Keep it up Hank Green, your teaching style is awesome. Hope, you will continue to teach us more and more...........:)

[@katjnz]

1 minute in. The geography geek in me is very, very, very happy this course is happening.

[@anjaligonuguntla1088]

This isn't fast at all. Hank does an amazing job. I get so much info in such little time. Keep on keeping on, Hank! Lets keep that mosquito population to a minimum! XD

[@bluejedi723]

I passed my college ecology class because of Hank. Thank you for saving my life!

[@steakismeat177]

I remember this. The winter didnt kill as many mosquitoes as normal. I'm from dallas.

[@katalinaalvarez1663]

1. What is the study of how individual groups within a species interact? __________________________________ 2. A group of individuals of one species who interact regularly is a ______________________________________. 3. ______________________ is how many offspring an individual can have in a lifetime. 4. A mosquito can have _____________________________ offspring in its lifetime. 5. ______________________________ factors keep population growth in check. 6. What limiting factors were removed for Dallas area mosquitoes? ____________________________________ 9. List some density dependent limitations: _________________________________________________________ 10. List some density independent limitations: ______________________________________________________ 11. Humans have been on an exponential growth curve since __________________________________________. 12. The leveling out of the logistic growth graph is almost always caused by a _____________________________. 13. Write the equation for the population growth rate, making sure to identify the variables. 14. Calculate the population growth rate of a rabbit population (1500 individuals) where there are 300 new births each year and 120 deaths? I know someone’s got the answers 🙃

[@Urbanfour]

The ironic part about Chernobyl is that the lack of a human population in the restricted zone has actually counteracted the radiation in the area to the point that many species have flourished and some have even returned.

[@sarahwitney6751]

I actually really like the lack of math in most of the videos. I feel like it really helps to understand the overall concept as a story, and then the math makes more sense later because i know what the numbers mean. It would be cool if there was like a link to a math worksheet in the description or something though, but I feel like I remember it better when it's in story form. Anyway, thanks so much!

[@lavidawithjoey]

I'm very grateful for amazing resources like these

[@khaiderickmafa296]

10years later and still relevant. Thank you

[@bethomas1837]

Your crash courses are helping me not fail aha

[@harvardlawfan]

yesssss! my bio teacher sent me here to watch something for class and i was worried it was going to be boring but then it's HANK!!

[@lucythelulu135]

AP Human Geography test tomorrow..... Time to cram the nerd fighter way!

[@JacksHacks2012]

We are very trusting in the consistent quality of Hanks videos, and if it ends up disappointing us, we will change our vote accordingly.

[@imainternetexplorer5227]

“Wake up” Me: No

[@BadSeedGames]

I just gotta say, You have the catchiest intro song i've ever heard on KZbin (even to the point of it getting stuck in my head.)

[@rafaelximenes6550]

I think Hank forgot to add the immigration and subtract the emmigrations, on the equation. That's important.

[@ragnkja]

Maybe he assumed they would be pretty much equal?

[@gumbydance]

I like that you focused on an example to explain the concept.

[@Sporkredfox]

Crash course differential equations!!! It would be so helpful for all of this

[@monicaa57]

I don't watch every video from channels I'm subscribed to, but when I saw "Texas Mosquito Mystery", how could I resist?

[@xavierhughes5522]

Welp... exam tomorrow... here we go...

[@prefectdreyfus]

This is exactly the topic I've been researching for my lab report on mountain pine beetle in British Columbia.

[@patriciamcgeorge2575]

Watching this now during the corona outbreak

[@madelinegourley6947]

Patricia McGeorge same

[@Deathbydorfattack]

The fun thing with exponential curves is that they don't usually come with tops. Unless you factor in all the deaths by starvation, then you get an asymptote (bit where the curve stops going up) as human death by starvation matches population growth, and we reach our carrying capacity.

[@GermaphobeMusic]

1:01 when apple removes the headphone jack

[@metalElvalover]

I'm a Dallas area human. A co-worker of mine claimed (in the wake of this outbreak) that there were 2million people in Texas. There are in fact more than 25.6million. Around 6-7million in DFW alone. I personally actually got a record low of mosquito bites this summer (0). But these reports however were rather worrisome. Every time I got some random bump and a sniffle I thought "Oh god! West Nile strikes again!" Luckily, being a nerd, I stayed inside and therefor safe.

[@lydmonkey4593]

5:03 It would be wierd if humans did that. Girl: walks into dude cloud Also Girl: walks out with boyfriend

[@clicktheyellowbox]

You just summed up the last 3 weeks of my bio class.

[@jasonnolan6080]

I fucking love science

[@flubs2298]

I LOVE FUCKING SCIENCE!

[@KhanaHatake]

If Hank makes a video over Thanksgiving week, Crash Course Ecology will have caught up with my AP Environmental Science class, making test reviews so much easier!!

[@joshbennema]

1:01 me, when a new subject in school is introduced

[@sammyfreakshere]

I think it's fascinating how Hank (and Co.) make an awesome video with a lot of really interesting and easy understandable stuff and everyone plays Sherlock Holmes to find out if Hank is a backwards writing lefty or if they used a mirroring for that shot...

[@HockeyChamp3]

"Busting through a brick wall like the Kool-Aid man"

[@AddisonReece]

!!!!!!!!!!!!!!!! Wow... I do believe you just covered half my semester in ecology... in 12 mins... with the same exact examples.... (mind blown)

[@gilbbyoutdoors]

This guy just predicted Corona look at 8:45

[@shadebug]

Changing hair direction was the easy bit; moving his birthmark and shirt pocket was badass

[@dustinheese]

"I have good friends that are vertebrates in Dallas. You might even be able to suck their blood."

[@mizsparrow]

because he is freaking awesome, and we need all the Hank we can get.

[@daviddelgado9928]

Who else knocked out watching this 😭

[@CosmicIX]

These videos are very helpful to build basic concepts of many fields. Thank you.

[@slimshady-eg1vg]

Exam? EXAM!? (big Draco voice)

[@kdkorz10211]

ABSOLUTELY ON CRASHCOURSE ECON! With big picture stuff like the housing bubble and some practical family-type economics stuff would be great, too.

[@richrso5347]

10:40 this dude trying to rap😂

[@rayamoooooo685]

Yo

[@antihax91]

11 minutes of crash course, and 53 seconds of static is still worth a like.

[@JuiceMonkey1221]

Yea! Let's go Dallas!

[@blatchrose]

Hey John the question I was hoping you would address is: do mosquitos carrying the west nile virus pass it on to their unborn children? Do they contaminate the stagnant water pools? Or are their children born west nile free

[@VR-dq3ew]

Nice Shirt. That is my contribution.

[@WutLawl]

biogeography test tomorrow. pointless for pharmacy major skills but youtube + crash course is my life essence right now

[@danw2011]

impressive backwards writing!

[@kroee]

it is known that backwards writing also causes the mole on you neck to move to the other side, and your wedding ring to switch hands. the image is reversed

[@datweirdkid3200]

He is writing backwards bcuz if he wasn't writing backwards then we would've seen it backwards. Do u understand :)

[@InterferenceProject]

Hi Hank, just would like to throw in that there is also physiological ecology (dealing with individual organisms and how their physiology and their environment interact) and biosphere ecology (dealing with relationships between global-scale climates and the distribution of organisms)

[@datweirdkid3200]

I killed a mosquito while watching this video XD

[@thomasrocha4891]

As a resident of the Dallas area, I would like to know if you think that the population growth of the mosquitoes had anything to do with the the year 2011, because, while 2012 was unseasonably warm and dry, it actually was a relief compared to the record-breaking summer of 2011. Or did this all have more to do with our very warm winter and spring?

[@VR-dq3ew]

He's writing all of that backwards lol

[@johnmeadow1426]

no, they just reversed the picture. the mole on the left side of his neck is on the right and his hair is combed the other way.

[@VR-dq3ew]

Whoops!

[@charlieyon8642]

Sean Pratt oh yeah, i see that

[@VR-dq3ew]

I feel stoopz

[@VR-dq3ew]

#Feelingdumbsince2014

[@CromlechDolmen]

He's not actually writing backwards, it's either that the video was flipped during editing or it's a mirror. If you want proof go to an early part of the video, say 0:06 notice that the left half of his shirt overlaps over the right half of his shirt (at the button/seam area), now go to the part where he's writing backwards, say 10:15 notice now that the right half of his shirt overlaps over the left half of his shirt.

[@ladycee5656]

It's hard to focus when i find him attractive. :/

[@ladycee5656]

i hope Hank won't see this comment. .__. keep it a secret

[@icap.7166]

+Ladycee me af

[@yasminakatebi9265]

Well,why?i don't see any specific attractive feature in him.i only see a guy which his mind is really grown up.so much growth.but nothin else.

[@pranaylotey774]

+Yasmina Katebi u are the most arrogant person in the internet

[@yasminakatebi9265]

+P.DiddyLancealot i can't understand why u said that.i just said my idea.he's not hot.he's not some thing u should pray to or anything else,hes a great human being.but mentally.not physically.i just expressed my idea.i do not see any reason for ur aggression.i was just curious to know,whats attractive in him,so i could see him hot too. Chill out,why people on youtube usually get aggressive and offend each other for no specific reason??

[@EmperorDex13]

Overall, Crash Course has some great videos on many school topics. They really help! Especially the science ones!

[@PINGPONGROCKSBRAH]

BY THOR'S HAMMER!

[@shoodilydoodily]

I hate to be the bubble-burster here, but you can see the mole on Hank's neck change sides at 9:46. Although I am quite impressed by his ability to change words to numbers just by pointing and saying "BLINK" ;)

[@karanbirsingh3338]

I bet i get top comment

[@SuperNumber420]

no you won't

[@karanbirsingh3338]

fourPOdimethylT yea i will

[@SuperNumber420]

1

[@LangeE612]

Yes, like Thomas Malthus stated at the end of the 18th century, human population growth will always reach a limit where there is not enough land to feed them all, leading to war over the scarce resources and hunger which makes people more vulnerable to diseases. And of course war, hunger and disease reinforce each other

[@georgerickard5509]

that hum when the subtitles come up is pretty annoying

[@mrturtleguy23]

I'm loving Ecology. I'm really excited for next weeks Episode. Thankyou crashcourse :D

[@seanradley3677]

Hello I just wanted to say that this has helped me because I am eco leader and this has really helped thanks hank!

[@EricMyungjinChung]

Thanks for including some math. I know its tough to understand sometimes, but I think it's important for people to see some math while learning.