Question

Select all the correct answers. An invasive fish species was accidentally introduced into a river. At first, it experienced a sudden surge in its population. Then it experienced a steady decline. Which statements give plausible reasons for this trend?
It became prey to certain organisms in the river.
It lacked adaptations suitable for that particular ecosystem.
It had no predators in its new environment.
It had few organisms to compete with for resources.

Answer 1

A and C I think that is the correct answer.

Answer 2

Answer: It became prey to certain organisms in the river.

It lacked adaptations suitable for that particular ecosystem.

Explanation:

An invasive species is the one which when introduced either accidentally or intentionally to a new ecosystem is capable of causing damage to the native species. Invasive species compete with the members of the native species for resources.

In the given situation, the population of the invasive species increased intially but decline later. This occurred due to two reasons.

1. It became prey to certain organisms in the river. : The invasive species could be used as a food by certain predatory species already present in the river.

2. It lacked adaptations suitable for that particular ecosystem.: Being new to the river ecosystem the invasive species could have adapted as adaptation favours the survival of the organism in unfavorable condition. This resulted in decline of the invasive species population.