Question

primary producers: phytoplankton, submerged aquatic vegetation (sav), vegetation
herbivores: zooplankton, benthic invertebrates
primary consumers: small planktivorous fish, bivalves, herbivorous ducks
secondary consumers: gulls and terns, wading birds, large piscivorous fish, sea ducks, tundra swan, geese and mute swans
options:

• the small fish and wading birds would be affected.
• only the small fish would be affected.
• the small fish, bivalves, and invertebrates would be affected.
• the entire food web would be affected.

Explanation:

In a food web, all organisms are interconnected. If a part of the food web (like a producer or consumer) is affected, it impacts the entire web because species depend on each other for energy (food). For example, if phytoplankton (a primary producer) declines, zooplankton (herbivore) that eat it decline, then small planktivorous fish (primary consumer) that eat zooplankton decline, and so on up the web. So any disruption at one level ripples through all levels, affecting the entire food web.

Answer:

The entire food web would be affected.