[Campbell Biology P.1232] The text poses the question, "How might the importance of various a... | Practice Question

The text poses the question, "How might the importance of various abiotic factors differ for aquatic and terrestrial ecosystems?" Considering the types of abiotic factors listed in Figure 52.18 and general ecological principles, which of the following statements is most likely true regarding this difference?

  • A: Salinity and oxygen levels are generally more critical abiotic factors in terrestrial ecosystems than in aquatic ones.
  • B: Temperature fluctuations are typically less extreme in aquatic environments than in terrestrial environments, making temperature a less variable limiting factor.
  • C: Light penetration is consistently uniform and abundant throughout aquatic ecosystems, unlike in terrestrial environments where it varies.
  • D: Soil structure and fire regimes are universally more dominant limiting factors in aquatic ecosystems than in terrestrial ones.

Explanation

Water has a high specific heat capacity, meaning it heats up and cools down more slowly than air or land. This property buffers temperature changes in aquatic environments, leading to less extreme temperature fluctuations compared to terrestrial environments. Salinity and oxygen are highly critical in aquatic systems, while soil structure and fire are primarily terrestrial factors. Light penetration in water decreases significantly with depth.