To solve this problem, we need to trace the flow of energy in the food web. A food chain always starts with a producer (an organism that makes its own food, usually plants or algae) and ends with a top predator (an animal that is not eaten by anything else in this specific diagram). The arrows show the direction the energy moves: from the thing being eaten to the thing that eats it.
Step 1: Identify the Producers and Top Predators
*
Producers: Looking at the bottom of the diagram, we see
Algae,
Seaweed, and
Phytoplankton. These are the starting points for all chains.
*
Top Predators: Looking at the top and sides, we see animals that have arrows pointing to them but no arrows pointing away from them (meaning nothing eats them in this picture). These are the
Shark,
Sea Lion, and
Killer Whale.
Step 2: Trace Chain 1 (Ending with the Shark)
Let's find a path that leads to the Shark.
1. Start at
Algae.
2. Follow the arrow to
Shrimp (Shrimp eat Algae).
3. Follow the arrow to
Squid (Squid eat Shrimp).
4. Follow the arrow to
Shark (Sharks eat Squid).
* *Chain:* Algae → Shrimp → Squid → Shark
Step 3: Trace Chain 2 (Ending with the Sea Lion)
Let's find a path that leads to the Sea Lion.
1. Start at
Seaweed.
2. Follow the arrow to
Sea Urchin (Sea Urchins eat Seaweed).
3. Follow the arrow to
Sea Otter (Sea Otters eat Sea Urchins).
4. Follow the arrow to
Sea Lion (Sea Lions eat Sea Otters).
* *Chain:* Seaweed → Sea Urchin → Sea Otter → Sea Lion
Step 4: Trace Chain 3 (Another path to the Shark)
Let's try a different route involving Phytoplankton.
1. Start at
Phytoplankton.
2. Follow the arrow to
Krill (Krill eat Phytoplankton).
3. Follow the arrow to
Fish (Fish eat Krill).
4. Follow the arrow to
Shark (Sharks eat Fish).
* *Chain:* Phytoplankton → Krill → Fish → Shark
Step 5: Trace Chain 4 (Ending with the Killer Whale)
Let's find a path that leads to the Killer Whale.
1. Start at
Algae.
2. Follow the arrow to
Shrimp.
3. Follow the arrow to
Fish (Fish eat Shrimp).
4. Follow the arrow to
Killer Whale (Killer Whales eat Fish).
* *Chain:* Algae → Shrimp → Fish → Killer Whale
*(Note: There are other possible combinations, such as Seaweed → Crab → Octopus → Killer Whale, but the four listed above are clear examples found directly in the diagram.)*
Final Answer:
1.
Chain 1: Algae → Shrimp → Squid → Shark
2.
Chain 2: Seaweed → Sea Urchin → Sea Otter → Sea Lion
3.
Chain 3: Phytoplankton → Krill → Fish → Shark
4.
Chain 4: Algae → Shrimp → Fish → Killer Whale
Parent Tip: Review the logic above to help your child master the concept of aquatic ecosystems worksheet.
