Loading presentation...

Present Remotely

Send the link below via email or IM

Copy

Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

DeleteCancel

Make your likes visible on Facebook?

Connect your Facebook account to Prezi and let your likes appear on your timeline.
You can change this under Settings & Account at any time.

No, thanks

04.08 Food Webs

No description
by

lauren briley

on 3 December 2013

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of 04.08 Food Webs

On the diagram below, what percentage of energy (from the choices in blue on the left) is transferred from a producer to a:

(A) secondary consumer, (B) tertiary consumer, (C) quaternary consumer?
Not all adults feed at a high tropic level. Whale sharks (50 ft) are the largest fish and feed on plankton and small fish, while Great White sharks (20 ft) are the largest carnivorous fish and feed on sea lions, seals and large fish. Blue whales (100 ft) are the largest whale and feed primarily on plankton and krill, while the Sperm whale (45 ft) is the largest carnivorous whale feeding on fish and very large squid.
(a) How does the location of each animal's position in relation to the producers contribute to their size? Be sure to look at the food chain and the amount of energy that is being transferred between the levels.
(b) Why do you suppose the plankton feeders are able to attain such large sizes compared to the carnivores?
Image by Tom Mooring
04.08 Food Webs
Lauren Briley

Why is it beneficial that many predatory fish have larval and juvenile stages that feed at a low tropic level, while the adults feed at a tertiary or quaternary tropic level?
Look at the quote from Rachel Carson on the first page. What do you think the quote means? Use some of the terms we have covered regarding the topic of food webs in your one to two paragraph explanation.
The producer takes 100% from the sun, and gives 10% percent of that to the primary consumer (10%), first we have to be clear on the fact that as we go higher the amount of energy derived is lesser, so the secondary consumer would take 1% of the producers energy, the tertiary would take 0.1% and the quaternary would take 0.01%.
The literal meaning of this quote from Rachel Carson is self-evident. More important, however, is the fact that she was (and still is) absolutely right about it. In this quote, Rachael Carson is describing the harmonious inter-relationship between the planets, the earth and the species found there on.

I think few people disagree intellectually with this, but fewer still live their lives with a full and accepting appreciation of its truth. If we lived as if we fully understood and embraced this truth, we would do far less harm to each other and to the planet, because we would see that, sooner or later, harm to other people and things ultimately results in harm to ourselves.
By having them feed at different tropic levels they are not competing for the same foods. The foods the adults eat are not the foods the juvenile eats so they are not intruding and competing against each other. That separation in tropic levels assists in the survival of the juveniles to the adult stage.
Think about land animals for a bit of comparison.
The large browsers, say an Elephant, travels how far for food for a day, and expends how much energy to get it.
The Carnivorous/or omnivorous animals have to spend how much energy to get their food?
There are some other factors relating to marine mammals, and their tropic needs as far as energy and body temp issues, so this will have some impact on the total caloric intake needed to run their body "furnace". There may be more food energy pound for pound in a carnivore's meal, but the offset in energy needed to catch it.
The plankton eaters may be big but that is why they are big so that they can consume more to grow. the carnivores though, are smaller so that they could be faster to catch their meal. (B)

(A) Whales though, are very large and cannot be very close to the shore so that is why they can barely be seen from the beach.
sharks though, are smaller and can get in and out of the shore because they are more flexible and faster.
Directions
Use the information above to answer the following questions.

On the diagram below, what percentage of energy (from the choices in blue on the left) is transferred from a producer to a: (A) secondary consumer, (B) tertiary consumer, (C) quaternary consumer?




Look at the quote from Rachel Carson on the first page. What do you think the quote means? Use some of the terms we have covered regarding the topic of food webs in your one to two paragraph explanation.

Why is it beneficial that many predatory fish have larval and juvenile stages that feed at a low trophic level, while the adults feed at a tertiary or quaternary trophic level?

Not all adults feed at a high trophic level. Whale sharks (50 ft) are the largest fish and feed on plankton and small fish, while Great White sharks (20 ft) are the largest carnivorous fish and feed on sea lions, seals and large fish. Blue whales (100 ft) are the largest whale and feed primarily on plankton and krill, while the Sperm whale (45 ft) is the largest carnivorous whale feeding on fish and very large squid.
(a) How does the location of each animal's position in relation to the producers contribute to their size? Be sure to look at the food chain and the amount of energy that is being transferred between the levels.
(b) Why do you suppose the plankton feeders are able to attain such large sizes compared to the carnivores?
Full transcript