An Ecosystem Has Very High Productivity, Abundant Rain, and Long

question 209

Multiple Choice

An ecosystem has very high productivity, abundant rain, and long growing seasons with relatively high temperatures.Strands in its food webs have no more than three or four trophic levels.Which of these factors is least likely to affect the number of trophic levels in the food web?

• A) Energy is lost at every trophic level, so the web can only support a limited number of levels.
• B) Top predators limit the number of trophic levels because they have no predators.
• C) Humans control all major food webs and maintain the number of levels by predation.
• D) Having fewer levels makes it easier for a web to recover after a disturbance.
• E) The presence of omnivores limits NPP and possibly the number of trophic levels.

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