Respuesta :
The trophic web is the transference of energy through different trophic levels. TL1) algae, seaweed /TL2) urchins, abalone, snails, crabs / TL3) sea-stars, otter, fish /TL4) octopus, sea lions /TL5) orca / Detritivore) cucumbers.
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The trophic web is a relationship process between different organisms, through which occurs transference of energy.
The ones placed at lower levels pass energy to the ones at the higher levels.
Organisms at each level feed on the preceding one and become food for the next one.
• The first link corresponds to a producer organism -autotroph-.
• The following links are the consumers -heterotrophs-: herbivores and carnivores.
• The last links are the decomposers that degrade organic matter from dead organisms.
As it is a web, all organisms are equilibrated until a change occurs.
When the change affects any of the involved links, there can be a cascade effect on the web.
A change in a link population size (increasing or decreasing) will affect the superior links and the immediately anterior link.
Trophic pyramid:
The trophic web can be represented as a pyramid.
The base of the pyramid is always composed of producers, followed by primary consumers, secondary, tertiary, and so on.
Outside the pyramid and closing the cycle, we can find decomposers and detritivorous.
Now, to complete the trophic pyramid, let us analyse information provided by the statement.
We will see who feeds on who.
- seaweeds and single-celled algae ⇒ photosynthetic organisms
- sea urchins, abalone, snails, and crabs ⇒ feed on photosynthetic organisms
- Sea stars ⇒ prey on urchins, abalone, snails
- Octopus ⇒ eat crabs, fish, and sea stars
- Otters and small fish ⇒ eat urchins, abalone, snails, and crabs
- Sea lions and harbor seals ⇒ feed on fishes
- Orcas and sharks ⇒ feed on otters, fishes, dolphins, sea lions, seals
- Sea cucumbers ⇒ eat dead organic matter
The options to complete the pyramid are snail, abalone, orca, otter, single-celled algae, urchin, small fishes, seaweed, crabs, sea lion, cucumber, octopus, and sea-star.
According to the analysis we did before about who feeds on who, we will complete the pyramid.
- Producers TL1 ⇒ seaweeds and single-celled algae
- Primary consumers TL2 ⇒ sea urchins, abalone, snails, and crabs
- Secondary consumer TL3 ⇒ Sea-stars, Otters and small fish
- Tertiary consumer TL4 ⇒ Octopus, Sea lions
- Quaternary consumer TL5 ⇒ Orca
- Decomposer/Detritivore ⇒ Sea cucumbers
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