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Genetic diversity of Ponto-Caspian amphipods throughout the invaded Baltic and native NW Black Sea donor ranges: does introduction mode matter?

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Abstract

The SE Baltic region harbors a diverse assemblage of alien amphipods of Ponto-Caspian origin. The composition of this fauna was shaped by three invasion waves: (1) pre-twentieth century dispersals via watershed-connecting canals, (2) deliberate introductions in the 1960s, and (3) last decade dispersals via shipping and existing canals. Given this complex history, we test whether genetic diversity (mitochondrial COI and nuclear OPS) differs between the native and invaded ranges and between the deliberately introduced species and the ones that dispersed on their own. We find that in the native range the two species groups exhibited similar COI diversity, while OPS diversity was higher in the deliberately introduced species. In the invaded range, COI diversity significantly decreased in all species, but more so in the self-dispersed group. No change in OPS diversity was detected among ranges. Mitochondrial diversity was more structured geographically in the native range, and the dominant invasive haplotypes were detected in the native populations of all but one species, further highlighting the utility of this marker in tracing invasion sources. Our comparative approach provides important insight into the inter-range genetic diversity of Ponto-Caspian invaders, highlighting the role of introduction mode.

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Data availability

The DNA sequences generated during this study are available in GenBank (COI: OQ788623-OQ788975, OPS: OQ813899-OQ81405, 28S: OQ801263-OQ801288).

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Acknowledgements

We thank Jūratė Lesutienė and Gintautas Vaitonis for help during the fieldwork in Ukraine in 2012. This study was supported by the Research Council of Lithuania (Contract No. S-MIP-20-26). Sampling in Ukraine in 2012 was supported by a grant from the Research Council of Lithuania (Contract No. LEK-10/2012). HM was supported by the ALLEA “European Funds for Displaced Scientists” (EFDS) (Contract No. EFDS-FL1-27).

Funding

This study was funded by the Research Council of Lithuania (Contract No. S-MIP-20-26). Sampling in Ukraine in 2012 was supported by a grant from the Research Council of Lithuania (Contract No. LEK-10/2012). HM was supported by the ALLEA “European Funds for Displaced Scientists” (EFDS) (Contract No. EFDS-FL1-27).

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Predictions and residuals of the LMEMs for the COI (top) and OPS (bottom) marker diversity metrics (see Table 3 for model effects tests). Metric abbreviations: Hn – haplotype number, Hd – haplotype diversity, Pi – nucleotide diversity, K – average number of nucleotide differences. Thick lines represent estimated means. Significant multiple comparisons are indicated by thin connecting lines of different patterns, absence indicating results with P > 0.05

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List of sampling localities and associated information is provided in Table S1

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Copilaş-Ciocianu, D., Šidagytė-Copilas, E., Son, M.O. et al. Genetic diversity of Ponto-Caspian amphipods throughout the invaded Baltic and native NW Black Sea donor ranges: does introduction mode matter?. Hydrobiologia 850, 3061–3076 (2023). https://doi.org/10.1007/s10750-023-05230-6

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  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s10750-023-05230-6

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