Population genomics of a sailing siphonophore reveals genetic structure in the open ocean
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View abstract on PubMed
Summary
This summary is machine-generated.The study reveals that the man-o-war (Physalia) is not a single global population but comprises at least four distinct species. These species show significant genetic structure, challenging previous assumptions about open ocean mixing.
Area Of Science
- Marine Biology
- Genomics
- Citizen Science
Background
- The open ocean is considered a highly connected environment, with organisms hypothesized to form massive, well-mixed populations.
- The man-o'-war (Physalia) uses its float and crest for long-distance dispersal, making it a model for studying open ocean population connectivity.
Purpose Of The Study
- To test the hypothesis of a single, panmictic (globally mixed) Physalia population.
- To identify and delineate distinct species within the Physalia genus using genetic and morphological data.
- To investigate population structure and connectivity in relation to oceanographic factors.
Main Methods
- Whole-genome sequencing of 151 Physalia samples.
- Analysis of thousands of citizen-science images from iNaturalist.org to identify morphologies and distributions.
- Ocean circulation modeling to correlate population structure with environmental factors.
Main Results
- Genomic data revealed five distinct lineages, indicating strong reproductive isolation despite overlapping ranges.
- Morphological analysis identified four recognizable forms, linked to four of the genetic lineages.
- Significant population structure was observed within species, aligning with regional ocean currents and winds.
- At least four Physalia species were identified, including a newly described species, Physalia minuta.
Conclusions
- The hypothesis of a single, panmictic Physalia population is rejected.
- Physalia comprises at least four distinct species with significant regional population structure.
- Ocean currents and winds play a crucial role in partitioning genetic variation even in highly mobile marine species.
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