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Food Web

ecology

Definition

A food web describes the network of feeding relationships in an ecosystem. In the Southern Ocean, penguins occupy a mid-trophic-level position: they consume krill, fish, and squid while being preyed upon by leopard seals, orcas, and skuas. Penguins transfer energy from productive lower trophic levels to top predators, making them indicator species for overall ecosystem health. When penguin populations decline, it often signals broader disruptions in the food web, such as krill shortages or fish stock collapses.

Related Terms

Krill

Krill are small, shrimp-like crustaceans (order Euphausiacea) that form the dietary backbone of many penguin species, particularly in Antarctic and sub-Antarctic waters.

Pelagic

Pelagic refers to the open ocean environment, far from shore and the sea floor.

Upwelling

Upwelling is an oceanographic process in which cold, nutrient-rich water rises from the deep ocean to the surface, typically driven by wind patterns or the shape of the coastline.

Frequently Asked Questions

What does food web mean in penguin biology?

A food web describes the network of feeding relationships in an ecosystem. In the Southern Ocean, penguins occupy a mid-trophic-level position: they consume krill, fish, and squid while being preyed upon by leopard seals, orcas, and skuas. Penguins transfer energy from productive lower trophic levels to top predators, making them indicator species for overall ecosystem health. When penguin populations decline, it often signals broader disruptions in the food web, such as krill shortages or fish stock collapses.

Keep learning

Glossary entries define the language. FAQ answers common questions; guides carry the longer Survival Lab arguments.

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Where this definition comes from

Reference bodies behind the ecology terminology. Links last checked August 5, 2026.