The supergiant amphipod Alicella gigantea may inhabit over half of the world's oceans
1School of Biological Sciences, The University of Western Australia, Perth, Western Australia, Australia.
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Summary
The deep-sea amphipod Alicella gigantea, once thought rare, is now known to be widely distributed across 59% of the world's oceans. This supergiant amphipod inhabits abyssal and hadal zones, challenging previous assumptions about its rarity.
Area of Science:
- Marine Biology
- Deep-Sea Ecology
- Genetics
Background:
- Alicella gigantea, the world's largest amphipod, inhabits abyssal and hadal zones.
- Historically considered rare due to infrequent sampling and limited genetic data.
- Previous studies suggested low population densities and limited distribution.
Purpose of the Study:
- To reassess the distribution and rarity of Alicella gigantea.
- To investigate the species' population dynamics and global range.
- To explore the historical distribution of A. gigantea throughout geological time.
Main Methods:
- Compiled 195 records of A. gigantea from 75 global locations.
- Analyzed DNA sequences from two mitochondrial genes (16S, COI) and one nuclear gene (28S).
- Examined distribution patterns across all oceans.
Main Results:
- A. gigantea occupies approximately 59% of the world's oceans.
- The species is widely distributed, contrary to previous assumptions of rarity.
- Genetic analysis supports a broad geographic range.
Conclusions:
- Alicella gigantea is not a rare species but a widely distributed deep-sea amphipod.
- The species possesses an exceptional global range, inhabiting vast deep-sea areas.
- Further research on deep-sea biodiversity is warranted given the extensive range of A. gigantea.