Question

1. 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

Explanation:

To determine the effect of doubling the number of crabs, we analyze the food web relationships. Crabs likely feed on organisms that interact with seagrass, fish, or birds. If crabs double, their prey (e.g., herbivores of seagrass, or organisms fish/birds eat) would be affected. For seagrass (option a), if crabs eat herbivores of seagrass, more crabs could reduce herbivores, increasing seagrass (not decreasing), so a is wrong. For birds (option b), if crabs compete with fish (bird's prey) or eat fish, more crabs could reduce fish, leading to birds having less fish to eat. For fish (option c), fish usually have multiple food sources, so "only one food source" is unlikely. Thus, b is the most logical as more crabs could impact fish populations (bird's prey), reducing fish available for birds.

Answer:

b. On the bird? Bird may have less fish to eat