Head to head
Antarctic Scallop vs Antarctic Krill
Antarctic Scallop
VS Antarctic Krill
Both invertebrates are filter feeders of the Southern Ocean, but they could hardly differ more in lifespan, abundance, or ecological role.
| Antarctic Scallop | Antarctic Krill | |
|---|---|---|
| Scientific name | Adamussium colbecki | Euphausia superba |
| Classification | A bivalve mollusc | A shrimp-like crustacean |
| Lifespan | Many decades | Much shorter, with individuals able to shrink to save energy |
| Feeding style | Filters particles from surrounding seawater | Filters phytoplankton and grazes sea-ice algae |
| Ecological role | Part of seafloor invertebrate communities | The central link in the Southern Ocean food web |
| Conservation status | Least Concern | Not Evaluated |
| Population trend | Unknown | Decreasing in parts of its range |
| Habitat | Ocean, polar | Ocean, polar |
Antarctic Scallop vs Antarctic Krill: common questions
Which one lives longer?
The Antarctic scallop lives far longer, capable of surviving for many decades, compared with Antarctic krill's much shorter individual lifespan.
Which one plays the bigger role in the Southern Ocean food web?
Antarctic krill plays the far larger role, forming the biomass base that feeds whales, seals, penguins, and countless other predators, while the Antarctic scallop remains a more localised part of seafloor communities.
Are both filter feeders?
Yes, both species filter tiny food particles from the surrounding water, though the Antarctic scallop feeds on general organic matter while Antarctic krill specialises in phytoplankton and sea-ice algae.