Question

the sunfish population in a local lake was monitored over several years. graph: population density (y - axis) vs time (x - axis), with a horizontal line labeled carrying capacity and a curve rising to near the line, then a peak at point x, followed by fluctuations what limiting factor is most likely responsible for the change occurring at point x in the graph?
options:
decreased predator population
increased water levels
increased sunlight availability
decreased food supply

Explanation:

1. Analyze each option:

• "Decreased predator population" would likely allow the sunfish population to increase, not cause a decline at Point X.
• "Increased water levels" is a favorable abiotic factor that would generally support population growth, not a decline.
• "Increased sunlight availability" is also a favorable factor for aquatic ecosystems (e.g., for photosynthesis supporting food chains) and would not cause a population drop.
• "Decreased food supply" is a limiting factor. When food becomes scarce, the population can't be sustained at the previous level, leading to a decline, which matches the drop at Point X after approaching carrying capacity.

Answer:

decreased food supply