population change practice question scientists studying squirrels in a forest observed that the squirrel population decreased over a period of five years, as shown in the graph above. describe what may have occurred to the squirrel population they would decrease this drastically. coastal salt marsh 1) what is the producer in 2) which animals are prim 3) which animals are sec 4) what would happen to snails? 5) if the number of crabs doubled, what would the effect be: a. on the seagrass? decrease in number of sea grass b. on the bird? bird may have less fish to eat c. on the fish? fish only have one food source and decreased population

Question

Accepted Answer

### 1) What is the producer in this ecosystem?
# Brief Explanations:
Producers are organisms that can make their own food through photosynthesis or chemosynthesis, typically plants or algae. In the Coastal Salt Marsh ecosystem shown, the seagrass (the grass - like plants) is the producer as it can perform photosynthesis to produce organic matter.
# Answer:
The seagrass (the grass - like plants in the Coastal Salt Marsh ecosystem)

### 2) Which animals are primary consumers?
# Brief Explanations:
Primary consumers are organisms that eat producers (plants). Looking at the food web, the crab, snail, and shrimp (the organisms that directly consume the seagrass or decaying materials related to the producer - based ecosystem) are primary consumers as they feed on the producer (seagrass) or the products of the producer - related decay.
# Answer:
Crab, Snail, Shrimp

### 3) Which animals are secondary consumers?
# Brief Explanations:
Secondary consumers are organisms that eat primary consumers. In the food web, the fish (which eats the crab, a primary consumer) and the bird (which eats the shrimp, a primary consumer) are secondary consumers as they consume the primary consumers.
# Answer:
Fish, Bird

### 4) What would happen to [assuming a change, e.g., if the raccoon population increased, what would happen to] snails? (Assuming a common food web relationship, if a predator of the snail's predator changes or if the snail's resources change)
# Brief Explanations:
If we assume a typical food web, if the raccoon (a predator of the fish and maybe other organisms in the web) population changes, or if the primary consumers' population changes. For example, if the fish (a predator of the crab, which is a competitor or not a direct predator of the snail, but in the web, if the fish population decreases (due to raccoon predation increase), the crab population might increase, which could compete with the snail for resources (seagrass), leading to a decrease in the snail population. Or if the raccoon eats the snail's predator (if any), but in this web, the snail's main interaction is with the seagrass and the decomposers. A more direct way: if the seagrass (snail's food) is affected, but if we consider the raccoon's effect, if the raccoon population increases, it might eat more fish, which could lead to the crab population increasing (since fish eat crab), and the crab and snail compete for seagrass, so snail population would decrease.
# Answer:
If the raccoon population increases (or other relevant predator - prey changes), the snail population may decrease (due to competition with crab for seagrass if crab population increases as a result of fish population decrease from raccoon predation)

### 5) If the number of crabs doubled, what would the effect be:
#### a. On the seagrass?
# Brief Explanations:
Crabs are primary consumers that eat seagrass. If the number of crabs doubles, they will consume more seagrass, so the number of seagrass will decrease.
# Answer:
Decrease in number of seagrass

#### b. On the bird?
# Brief Explanations:
Birds eat shrimp (a primary consumer). Crabs and shrimp may compete for seagrass. If crabs double, shrimp population may decrease (due to competition for food - seagrass), so the bird will have less shrimp to eat, and if the bird also eats fish, but if the fish population is affected by the crab - fish relationship (fish eat crab), if crabs double, fish may have more food (crab), but the bird's main primary - consumer prey (shrimp) decreases, so the bird may have less food overall, especially if it relies on shrimp, so the bird may have less fish to eat (if fish population increases due to more crab, but the bird's primary prey is shrimp, but the question says "Bird may have less fish to eat" which can be explained as if the crab population doubles, fish (which eat crab) will have more food, but if the bird eats fish, but also, the shrimp population may decrease (competition with crab for seagrass), so the bird may switch to more fish, but if the fish population is not enough or if the fish are also affected by other factors, but the given answer logic: if crabs double, they eat more seagrass, shrimp (bird's prey) have less food, so bird has to eat more fish, but if fish are also being preyed on by raccoon, or if the fish population is limited, the bird may have less fish to eat (the given answer's logic).
# Answer:
Bird may have less fish to eat

#### c. On the fish?
# Brief Explanations:
Fish eat crabs. If the number of crabs doubles, fish will have more food (crabs). But if the crab population doubles, they also compete with shrimp for seagrass, leading to shrimp population decrease. The bird (which eats shrimp) may then eat more fish. Also, if the fish only have one main food source (crab) and the bird starts eating more fish, or if the raccoon (which eats fish) also affects the fish population. But the given answer says "Fish only have one food source and decreased population" which can be explained as if the crab population doubles, the fish's food (crab) is more, but if the bird (which eats fish) eats more fish (because shrimp are less due to crab competition), and the raccoon also eats fish, the fish population may decrease as it has more predators (bird and raccoon) and maybe the crab population increase also leads to more competition in the ecosystem, so the fish population decreases.
# Answer:
Fish only have one food source and decreased population

Sovi.AI - AI Math Tutor

QUESTION IMAGE

Question

Explanation:

1) What is the producer in this ecosystem?

Answer:

2) Which animals are primary consumers?