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Difficulty: MediumEcology and Environment

In an open ocean food chain, microscopic phytoplankton are consumed by zooplankton, which are then eaten by juvenile herring. Which trophic role do the juvenile herring fulfill in this marine ecosystem?

  1. A
    Primary producer
  2. B
    Primary consumer
  3. Secondary consumerAnswer
  4. D
    Tertiary consumer

Answer

Secondary consumer
In this ecological chain, phytoplankton serve as autotrophic primary producers and zooplankton function as herbivorous primary consumers. Because juvenile herring prey directly upon the primary consumers, their ecological classification is secondary consumer.

Step-by-Step Solution

1
Identify the primary producer and primary consumer in the described chain.
Phytoplankton capture sunlight as primary producers, and zooplankton graze on them as primary consumers.
Classifying the initial trophic tiers establishes the baseline structure of the energy flow.
2
Determine the trophic level of the juvenile herring based on their diet.
Since juvenile herring consume the herbivorous zooplankton (primary consumers), they occupy the secondary consumer level.
Organisms that feed directly on primary consumers are categorized as secondary consumers.

Key Concept

Trophic levels and energy flow in marine ecosystems
Estimated Time:45s
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Topics

Ecology and Environment

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