When river water temperature rises above 35°C, the most likely outcome is a decrease in the dissolved oxygen levels in the water. This occurs because as water temperature increases, its capacity to hold dissolved gases like oxygen decreases. This reduction in dissolved oxygen can have detrimental effects on aquatic life such as fish and other organisms that rely on oxygen for survival.
Here are the possible outcomes when river water temperature rises above 35°C:
1. The dissolved oxygen levels will decrease: This can lead to hypoxia, a condition where there is an insufficient amount of oxygen in the water to support aquatic life, ultimately resulting in fish kills and disruptions to the aquatic ecosystem.
2. The water may become polluted: High temperatures can accelerate the growth of harmful bacteria and algae, leading to water pollution. This pollution can further degrade water quality and harm aquatic organisms.
3. There will be negative health effects on wildlife: The decrease in dissolved oxygen levels and potential pollution can harm wildlife, leading to population declines and disruptions in the food chain within the ecosystem.
4. There may be decreased evaporation from the river: While increased temperatures can enhance evaporation rates, other factors such as humidity and wind conditions also play a role in evaporation. Therefore, the effect of increased water temperature on evaporation can vary depending on these additional factors.
In summary, when river water temperature exceeds 35°C, it is crucial to monitor the dissolved oxygen levels, water quality, and the health of wildlife to mitigate potential negative impacts on the ecosystem.
