Efficiency of energy transfers in aquatic ecosystems is...

Efficiency of energy transfers in aquatic ecosystems is typically higher than in land ecosystems because ____________.
a. aquatic food webs include more endotherms
b. algae do not make lignin
c. primary production cannot occur in water
d. all of the above

Key Concepts

Energy Transfer Efficiency

This refers to the percentage of energy that is transferred from one trophic level to the next in an ecosystem. It is influenced by factors such as the digestibility of primary producers and the metabolic rates of consumers, and it plays a critical role in determining the structure and productivity of both aquatic and terrestrial food webs.

Aquatic vs Terrestrial Food Webs

Food webs in aquatic ecosystems often exhibit higher energy transfer efficiencies compared to terrestrial ones. This is largely because primary producers in aquatic systems, such as algae, generally have simpler structures and fewer chemical defenses, making them more digestible for consumers than complex terrestrial plants.

Lignin in Terrestrial Plants

Lignin is a complex organic polymer found in the cell walls of terrestrial vascular plants. It provides structural support and protection but also reduces the digestibility of plant material for herbivores, leading to lower energy transfer efficiencies in terrestrial food webs.

Algae Composition

Algae, which are the primary producers in many aquatic ecosystems, lack lignin. This absence contributes to their higher digestibility and allows for more efficient energy transfer from primary producers to consumers in aquatic food webs.

Transcript

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