期刊
MOLECULAR ECOLOGY
卷 30, 期 4, 页码 1042-1052出版社
WILEY
DOI: 10.1111/mec.15771
关键词
bacteria; crustaceans; fisheries management; microbial biology; population dynamics
资金
- Australian Antarctic Science Program [AAS-4015, 4313]
- Bioplatforms Industry Access Voucher
- Australia Research Council Discovery Early Career Researcher Award [DE180100828]
- Early Postdoc Mobility fellowship from the Swiss National Science Foundation [P2EZP3_162241]
- Australian Research Council [DE180100828] Funding Source: Australian Research Council
- Swiss National Science Foundation (SNF) [P2EZP3_162241] Funding Source: Swiss National Science Foundation (SNF)
The study found that the bacterial epibiont communities associated with Antarctic krill exhibit spatial structuring, mainly driven by distance rather than environmental factors, especially for strongly krill-associated bacteria. The turnover of bacterial communities is influenced by bacterial dispersal limitation, which increases with geographic distance. Additionally, physical isolation can cause krill-associated bacterial communities to diverge, as shown by divergent epibiont communities generated from a single krill swarm split between aquarium tanks under near-identical conditions.
Antarctic krill (Euphausia superba) are amongst the most abundant animals on Earth, with a circumpolar distribution in the Southern Ocean. Genetic and genomic studies have failed to detect any population structure for the species, suggesting a single panmictic population. However, the hyper-abundance of krill slows the rate of genetic differentiation, masking potential underlying structure. Here we use high-throughput sequencing of bacterial 16S rRNA genes to show that krill bacterial epibiont communities exhibit spatial structuring, driven mainly by distance rather than environmental factors, especially for strongly krill-associated bacteria. Estimating the ecological processes driving bacterial community turnover indicated this was driven by bacterial dispersal limitation increasing with geographic distance. Furthermore, divergent epibiont communities generated from a single krill swarm split between aquarium tanks under near-identical conditions suggests physical isolation in itself can cause krill-associated bacterial communities to diverge. Our findings show that Antarctic krill-associated bacterial communities are geographically structured, in direct contrast with the lack of structure observed for krill genetic and genomic data.
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