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Marine biodiversity: Gone with the wind?
Ira Maegele1, Pawel Burkhardt1
1Michael Sars Centre, University of Bergen, Bergen, Norway.
Current Biology : CB
|August 5, 2025
Summary
The Portuguese man-o-war, Physalia, is not one species but several distinct lineages. Ocean currents and wind create barriers, impacting marine connectivity and challenging previous assumptions.
Area of Science:
- Marine Biology
- Genomics
- Oceanography
Background:
- The Portuguese man-o'-war (Physalia) was historically considered a single, widespread species.
- Previous research lacked comprehensive data on its genetic diversity and population structure.
Purpose of the Study:
- To investigate the taxonomic status of the Portuguese man-o'-war (Physalia).
- To determine if Physalia represents a single species or multiple distinct lineages.
- To understand the role of oceanographic factors in shaping marine organism distribution.
Main Methods:
- Genomic analysis of Physalia specimens.
- Morphological examination of collected samples.
- Analysis of ocean current and wind pattern data.
Main Results:
- Evidence reveals multiple distinct lineages within the genus Physalia.
- Genomic and morphological data support the existence of separate evolutionary paths.
- Ocean currents and wind patterns act as significant barriers to dispersal, influencing genetic divergence.
Conclusions:
- The Portuguese man-o'-war is a species complex, not a single cosmopolitan entity.
- Geographic barriers formed by ocean dynamics play a crucial role in speciation.
- This finding necessitates a re-evaluation of marine connectivity and species distribution models.
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