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在有限的营养和光线供应下,沿盐度梯度的植物浮游生物固态度

Iris D S Orizar¹, Sonja I Repetti¹, Aleksandra M Lewandowska¹

¹Tvärminne Zoological Station, Faculty of Biological and Environmental Sciences, University of Helsinki, J.A. Palmenin 260, 10900 Hanko, Finland.

Journal of plankton research

|August 2, 2024

概括

盐度的增加增加在沿海植物浮游生物中增加了有机碳颗粒,占主导地位的藻物种调节了整体产量. 低位压力对初级生产和元素比率产生重大影响.

科学领域:

海洋生态海洋生态学
生物地质化学生物地质化学
植物浮游生物生理学

背景情况:

气候变暖改变了沿海盐度和营养素的可用性.
这些变化影响了植物浮游生物的元素固态度 (碳,,).
了解这些影响对于预测生态系统反应至关重要.

研究的目的:

调查盐度压力和营养物质的可用性如何影响植物浮游生物固体测量.
为了确定不同盐度对混合植物浮游生物群落的影响.
确定驱动社区级响应的关键物种.

主要方法:

在不同的光线,营养和盐度条件下化10种植物浮游生物多种植.
测量有机碳颗粒 (POC), (N), (P),叶绿素a和物种丰度.
对植物浮游生物元素组成和社区结构转移的分析.

主要成果:

植物浮游生物多种植园积累了更多的POC随着盐度的增加,由占主导地位的藻Phaeodactylum tricornutum驱动.
低度条件 (低盐度) 导致POC降低,C:N和C:P比率发生变化,表明初级生产减少.
物种组成因盐度而异,有些物种在营养不足的情况下壮成长.

结论:

盐度是植物浮游生物在沿海生态系统中POC积累和石化学的关键驱动因素.
主导的藻物种充当基础物种,控制整个社区的POC.
植物浮游生物对盐度变化的反应对碳循环在不断变化的沿海环境中具有重大影响.

关键词:

波罗的海波罗的海波罗的海碳的积累碳的积累.环境过环境过器植物浮游生物体石化测量石化测量盐度盐度盐度盐度盐度

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