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<p>Recruitment in marine invertebrates with planktonic larvae, such as mussels <i>Mytilus</i> spp., is influenced by a complex interplay of environmental, ecological, and genetic factors. In the subarctic White Sea, recent climate-driven shifts in temperature and seasonality may affect spawning phenology, larval duration, and settlement patterns, ultimately impacting larval survival, post-settlement mortality, and genetic composition of populations. This study investigates the temporal patterns of <i>Mytilus</i> larval abundance and settlement on suspended substrates, with a focus on genetic variation among cohorts. We tested two hypotheses: (1) settlement occurs in multiple waves driven by genetically distinct larval cohorts, and (2) post-settlement selection shapes genetic structure of spat over time. Planktonic sampling revealed a single pronounced peak of veliger and pediveliger larvae, followed by a major spatfall in July. Contrary to expectations, no secondary peaks were observed, indicating a synchronized spawning event. Genetic analysis confirmed the presence of <i>M. edulis</i>, <i>M. trossulus</i>, and their hybrids among settlers. Post-settlement selection significantly altered species composition, with <i>M. trossulus</i> dominating at 0.5&#xa0;m depth, while <i>M. edulis</i> prevailed at 2.5&#xa0;m, likely due to selective predation by seastars <i>Asterias rubens</i>. These findings reveal the central role of post-settlement ecological filtering in shaping genetic diversity and species composition in mixed <i>Mytilus</i> populations in a subarctic White Sea. The study provides new insights into recruitment processes and population resilience of <i>Mytilus</i> spp. in rapidly changing high-latitude environments.</p>

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Synchronized settlement and post-settlement selection shape genetic structure of Mytilus spp. in the Subarctic White Sea

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Alexey Sukhotin,
  • Lyudmila Flyachinskaya,
  • Julia Marchenko,
  • Evgeny Genelt-Yanovskiy,
  • Peter Lezin,
  • Vyacheslav Khalaman

摘要

Recruitment in marine invertebrates with planktonic larvae, such as mussels Mytilus spp., is influenced by a complex interplay of environmental, ecological, and genetic factors. In the subarctic White Sea, recent climate-driven shifts in temperature and seasonality may affect spawning phenology, larval duration, and settlement patterns, ultimately impacting larval survival, post-settlement mortality, and genetic composition of populations. This study investigates the temporal patterns of Mytilus larval abundance and settlement on suspended substrates, with a focus on genetic variation among cohorts. We tested two hypotheses: (1) settlement occurs in multiple waves driven by genetically distinct larval cohorts, and (2) post-settlement selection shapes genetic structure of spat over time. Planktonic sampling revealed a single pronounced peak of veliger and pediveliger larvae, followed by a major spatfall in July. Contrary to expectations, no secondary peaks were observed, indicating a synchronized spawning event. Genetic analysis confirmed the presence of M. edulis, M. trossulus, and their hybrids among settlers. Post-settlement selection significantly altered species composition, with M. trossulus dominating at 0.5 m depth, while M. edulis prevailed at 2.5 m, likely due to selective predation by seastars Asterias rubens. These findings reveal the central role of post-settlement ecological filtering in shaping genetic diversity and species composition in mixed Mytilus populations in a subarctic White Sea. The study provides new insights into recruitment processes and population resilience of Mytilus spp. in rapidly changing high-latitude environments.