A river flows into a lake. A community builds a dam to divert the river for crop irrigation use before it reaches the lake. Which describes a way in which biodiversity in the lake will be directly affected by this change? Select one:

The size of the lake will increase, attracting more organisms who rely on it as a water source.

Nutrient levels in the lake will increase, encouraging the growth of new plants.

With less water flowing into the lake, the water temperature increases. Some species are unable to survive in the warmer water.

Diverting the river will introduce new, invasive species into the lake.

With less water flowing into the lake, the water temperature increases. Some species are unable to survive in the warmer water.

Explanation:

Biodiversity of a lake is dependent on the flows from rivers. The health of the biota of the lake would be greatly affected when there is reduced flow of water from the river as a result of diversion into dams for agriculture purpose.

The major impact reduced water flow will have on the biota of the lake is that many species that cannot tolerate draught as a result of increase in water temperature caused by reduced flow of water, would eventually become extinct. The biota of the lake would diminish or decline.