100 Replies to “Energy Flow in Ecosystems

  1. So can we conclude that if the human population becomes vegetarian then as secondary consumers (rather than tertiary) there will be more energy to sustain a growing world populations?

  2. Why do biologists have to give these really important chemicals such gayass names as ATP or whatever… You know if it was a story, or an mmorpg, or a religion they'd call it something cool like life-essence or carnanimus, or mana.

  3. Just a simple question. Why do some animals, such as birds and alligators, help each other by the bird cleaning the alligators teeth and the alligator not eating the bird? I never understood that.

  4. That was helpful. I have few questions though i would like to know more about urban ecology or may be urban ecosystem

  5. 2:30 This one took me a good minute to sort out for myself even though it took you only 7 seconds to say it. "Misconception"? I think you mean "Something not often known." You use that word but immediately go on to explain the right idea, which is exclusively the opposite of a misconception. You might understand my confusion? As a listener, when I hear a setup like "One misconception is," I expect the misconception to be stated, and a correction to be stated. It's subconscious.

    Maybe I'm nitpicking, but this has the potential to be a problem.
    The change in subject came as a surprise. I felt like I was left with a cliffhanger, so my attention was adrift as the lecture continued.
    Many listeners may smooth over their critical thinking when they hear something that dissonant. I mean that they may just make an arbitrary decision on the fly as to what you meant without stopping to think so they won't miss anything. I wonder if a significant fraction of listeners will remember plants as NOT doing cell respiration since that's what anticipation would first determine.

    Thanks for following up with the clarifying sentence at 2:33 or I would have been misinformed rather than momentarily confused.

  6. Dude! Maybe slow down a bit or give us the same meds you are taking? What about the energy of geothermal? It is quite small compared to the chemical energy and our sun but does it not make contributions worth mentioning? Thanks for the video. Well done and appreciated.

  7. A real quick thing I want to add, the energy pyramid. There is a role of the 2nd law of thermodynamics, "energy does not diminish, but the ability to use it does." Something like that, that's why you see only 10% of the energy being passed down, due to respiration taking most of it and keep in mind of that law.

  8. For all those people complaining about how he was going too fast, there is a pause button guys! I paused the video a few times myself

  9. If the pyramid of biomass in aquatic ecosystem is inverted then how can higher tropic level organisms get the energy if only 10% is sent in higher tropic level. PLEASE HELP!

  10. If you think he is going too fast, then you are just too slow to process what he is talking about.

  11. I have a Biology test next Tuesday, and you summed up all the 9th grade 3rd season material that is included in this test, I understand everything now 😀 thx

  12. At 4:06 you talk about total productivity by ecosystem. What are your resources please? Google hasn't yielded very good results for me.

    Also, do you know of any data on efficiency of ecosystems? E.g. the desert might be less productive (lower volume of digestible calories) than the forest, but it could be more efficient than the forest at producing those calories.

    Lastly, "cultivated land" is an average. It fails to distinguish between types of cultivated lands. In some deserts ponds made by drilling into an aquifer attracts animals, which then thrive.

  13. You really are such a good teacher. Clear, pleasant and good at using models and examples that are easy to understand. Great job!

  14. That was helpful. When you say that there is a common misconception that plants respire, do you mean it is a misconception that plants respire with byproducts of CO2 and H2O? Because later on in the video, you said plants use about 60% of energy through respiration.

  15. Can some one answers my question please if the primary producers aka plants have the most energy how come they have less calories than tertiary consumers? My theory is that these animals are constantly eating therefore they create their fat reserves piling up energy aka calories

  16. this helps sooooooooo much
    College senior level ecology is harder than i thought. i was hoping it would be like animal planet lol

  17. Wow! The Video Help me a lot sir . Thanks for making an Perfect video for me cause I have an Lesson relate to this in my Biology book . Thanks for this Video .

  18. Thanks man. For the people who are complaining its too fast, just turn on subtitles and turn the video speed down to like 0.75 or 0.5. Jeez like srsly guys. Stop being so bloodsucking.

  19. I shall bet that if Alexander Graham Bell, Wright Brothers, and Edison to name just a couple would have a very hard time with ecosystems just look what they did 1 person did for mankind benefit. No structures at all.

  20. whhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhy is this guy so booooooooooooooooooooooooooooooooooooooooooooooooring

  21. for ayone at k12 who needs the times for the questions here u go. 0:20 , 0:51
    1:03 2:19 3:13 3:36 4:53 5:23 5:43 6:31 . hope this helps 🙂

  22. Wait i have a question. So we have the 10 percent law by leinderman…so as there is a 10% loss of energy along the trophic level…so vegeterians more energy efficient than non vegeterians ? So is it better to be a vegeterian ?

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