Cribrononion gnythosuturatum is a widely distributed benthic foraminifer. However, its adaptability to salinity changes is still poorly understood. To investigate the response of C. gnythosuturatum to salinity changes, sediment samples were collected from an intertidal zone of the Yellow Sea and cultured at 13 salinity gradients from 0 to 60 psu for 10 weeks. The results of the culture experiments were analyzed using morphological and eDNA methods. The results showed that extremely high tests broken rate at low salinities (<15 psu). Under high salinities (>50 psu), the stained protoplasm was concentrated in the center of the chambers. Meanwhile, both morphological and eDNA metabarcoding results showed that under abnormal salinity conditions (15–25 psu or 40–50 psu), the abundance, relative abundance and growth rate of C. gnythosuturatum reached the maximum value, while the tests were well preserved. This study reveals the mechanism by which C. gnythosuturatum is used as a salinity indicator for paleoenvironments.

中文翻译：

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底栖有孔虫 Cribrononion gnythosuturatum 的盐度指示通过 eDNA 宏条形码和形态学方法揭示


Cribrononion gnythosuturatum 是一种分布广泛的底栖有孔虫。然而，人们对它对盐度变化的适应性仍然知之甚少。为了研究 C. gnythosuturatum 对盐度变化的响应，从黄海的潮间带收集了沉积物样本，并在 0 到 60 psu 的 13 个盐度梯度下培养 10 周。使用形态学和 eDNA 方法分析培养实验的结果。结果表明，在低盐度 （<15 psu） 下，极高的检测破损率。在高盐度 （>50 psu） 下，染色的原生质集中在腔室的中心。同时，形态学和 eDNA 宏条形码结果显示，在异常盐度条件下 （15–25 psu 或 40–50 psu），C. gnythosuturatum 的丰度、相对丰度和生长速率达到最大值，同时测试保存完好。这项研究揭示了 C. gnythosuturatum 被用作古环境盐度指标的机制。