期刊
EVOLUTIONARY APPLICATIONS
卷 13, 期 8, 页码 1854-1867出版社
WILEY
DOI: 10.1111/eva.12932
关键词
Irish Sea; larval dispersal; particle tracking; population connectivity; RADseq; redundancy analysis
资金
- Interreg Ireland-Wales Programme ISPP
- Bluefish projects
- Interreg Atlantic Area Programme Cockles project
- SUSFISH project
- Welsh Government
- Higher Education Funding Council for Wales
- Welsh European Funding Office
- European Regional Development Fund Convergence Programme
- Aberystwyth University
Population dynamics of marine species that are sessile as adults are driven by oceanographic dispersal of larvae from spawning to nursery grounds. This is mediated by life-history traits such as the timing and frequency of spawning, larval behaviour and duration, and settlement success. Here, we use 1725 single nucleotide polymorphisms (SNPs) to study the fine-scale spatial genetic structure in the commercially important cockle species Cerastoderma edule and compare it to environmental variables and current-mediated larval dispersal within a modelling framework. Hydrodynamic modelling employing the NEMO Atlantic Margin Model (AMM15) was used to simulate larval transport and estimate connectivity between populations during spawning months (April-September), factoring in larval duration and interannual variability of ocean currents. Results at neutral loci reveal the existence of three separate genetic clusters (mean F-ST = 0.021) within a relatively fine spatial scale in the north-west Atlantic. Environmental association analysis indicates that oceanographic currents and geographic proximity explain over 20% of the variance observed at neutral loci, while genetic variance (71%) at outlier loci was explained by sea surface temperature extremes. These results fill an important knowledge gap in the management of a commercially important and overexploited species, bringing us closer to understanding the role of larval dispersal in connecting populations at a fine geographic scale.
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