Which of the following best explains how current and oxygen content affect the biodiversity of streams and rivers?

• A. High current and low oxygen content increase biodiversity by favoring only fast-swimming species.
• B. Low current and low oxygen content increase biodiversity by reducing competition among species.
• C. High current and high oxygen content generally increase biodiversity by supporting a wider range of aquatic organisms.
• D. Biodiversity in streams and rivers is unaffected by current or oxygen content.

Answer: (C)

Verified step by step guidance

1. Understand the concept of biodiversity: Biodiversity refers to the variety of life forms in a given ecosystem, including different species of plants, animals, and microorganisms. In aquatic ecosystems, factors like current and oxygen content play a significant role in determining biodiversity.
2. Analyze the role of oxygen content: Oxygen is essential for the survival of most aquatic organisms. High oxygen levels support a greater variety of species, including those with higher metabolic demands, as it ensures sufficient oxygen for respiration.
3. Examine the impact of current: High current in streams and rivers can help maintain oxygen levels by promoting aeration (mixing of oxygen into the water). It also prevents the accumulation of pollutants and sediments, creating a healthier environment for aquatic organisms.
4. Combine the effects of high current and high oxygen content: Together, these factors create favorable conditions for a wide range of aquatic organisms, including both fast-swimming species and those that rely on stable oxygen levels. This leads to increased biodiversity.
5. Conclude that biodiversity is influenced by environmental factors: High current and high oxygen content generally increase biodiversity by supporting a wider range of aquatic organisms, as opposed to low current or low oxygen content, which may limit the variety of species that can thrive.