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<p>Accelerated human-driven sedimentation is a significant stressor for bivalves and has been implicated in the lack of recruitment and recovery of New Zealand green-lipped mussels (<i>Perna canaliculus</i>). In June 2024, the short-term effects of sediment burial on juvenile green-lipped mussel behaviour, growth, and survival were assessed. Juvenile mussels (1.4 ± 0.01&#xa0;mm shell length) provided by SpatNZ Ltd were buried with a 1&#xa0;mm layer of &lt; 63&#xa0;μm silt–clay sediment for 4–8 days. Mussel crawling behaviour, growth, and survival were compared with non-buried control mussels. Movement away from the starting position was more common in smaller mussels, and very few left the sediment substrate (5%) in either treatment. Sediment burial impacted the ability of mussels to grow, with significantly lower mean growth in the buried mussels (1.90 ± 0.02&#xa0;mm) compared with non-buried mussels (2.10 ± 0.02&#xa0;mm) after 8 days. On average, the burial-related mortality of juvenile mussels reached 41.5 ± 3.2% after only 4 days in the burial treatment, significantly higher than in the control (32.5 ± 2.2%). Overall, the mortality was more pronounced among smaller mussels, a difference that increased with burial duration. This study demonstrates that juvenile green-lipped mussels are intolerant of high-sediment environments relative to other bivalves, which may help explain the low settlement and recruitment currently observed in coastal New Zealand.</p>

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The effects of sudden sediment burial on juvenile green-lipped mussels

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月11日

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  • Brandy S. Biggar,
  • Andrew Jeffs,
  • Jenny R. Hillman

摘要

Accelerated human-driven sedimentation is a significant stressor for bivalves and has been implicated in the lack of recruitment and recovery of New Zealand green-lipped mussels (Perna canaliculus). In June 2024, the short-term effects of sediment burial on juvenile green-lipped mussel behaviour, growth, and survival were assessed. Juvenile mussels (1.4 ± 0.01 mm shell length) provided by SpatNZ Ltd were buried with a 1 mm layer of < 63 μm silt–clay sediment for 4–8 days. Mussel crawling behaviour, growth, and survival were compared with non-buried control mussels. Movement away from the starting position was more common in smaller mussels, and very few left the sediment substrate (5%) in either treatment. Sediment burial impacted the ability of mussels to grow, with significantly lower mean growth in the buried mussels (1.90 ± 0.02 mm) compared with non-buried mussels (2.10 ± 0.02 mm) after 8 days. On average, the burial-related mortality of juvenile mussels reached 41.5 ± 3.2% after only 4 days in the burial treatment, significantly higher than in the control (32.5 ± 2.2%). Overall, the mortality was more pronounced among smaller mussels, a difference that increased with burial duration. This study demonstrates that juvenile green-lipped mussels are intolerant of high-sediment environments relative to other bivalves, which may help explain the low settlement and recruitment currently observed in coastal New Zealand.