Question

case study
the green river valley
the green river valley is home to a diverse ecosystem, including fish, amphibians, birds, small mammals, and a variety of plants. over the past decade, a new factory was built upstream, and chemical runoff began entering the river.
as a result:

• some fish populations declined sharply.
• frogs and other amphibians became less common.
• certain plants near the riverbank died off.
• birds and mammals that relied on fish or plants as food began moving away.

local scientists studied the area and found that the decline in one species caused a chain reaction, affecting multiple organisms and altering the structure of the ecosystem.
the community is now debating whether to implement stricter regulations to reduce pollution and restore the river ecosystem.
8 explain how the disruption in the green river valley ecosystem shows the importance of protecting biodiversity. include at least one example of how the loss of a single species affected other parts of the ecosystem.

Explanation:

1. Start by defining the role of biodiversity in ecosystem balance.
2. Analyze the case: identify the pollution - caused species loss (fish) and its ripple effects on other organisms (amphibians, birds, mammals, plants).
3. Explain the “chain reaction” (trophic cascade) to show how one species’ loss disrupts the ecosystem.
4. Conclude by linking this to the importance of protecting biodiversity to prevent such disruptions.

Answer:

To explain the importance of protecting biodiversity using the Green River Valley ecosystem disruption:

Biodiversity is crucial as each species plays a role in maintaining ecosystem balance. In the Green River Valley, the factory’s chemical runoff disrupted the ecosystem. For example, when fish populations declined (due to pollution), frogs (that rely on similar aquatic resources or fish as part of their food web/habitat) became less common. Birds and mammals that depended on fish for food or plants (which died due to pollution) for shelter/ food also suffered, with some moving away. This shows a “trophic cascade” or chain reaction: the loss of fish (a single species) triggered declines in amphibians, birds, mammals, and plant - dependent organisms. If biodiversity was protected (e.g., by preventing pollution), this chain reaction could be avoided, as each species’ presence supports the survival of others and the overall ecosystem structure (like nutrient cycling, food web stability, and habitat integrity).