The species richness and community composition of the diatom communities were studied in the Baltic Sea, Northern Europe, to enhance knowledge about the diversity of these organisms in a brackish water ecosystem. Many organisms in the Baltic Sea have been studied extensively, but studies investigating littoral diatoms are scarce. The goal of this study was to examine the importance of climatic, spatial and water physicochemical variables as drivers of epilithic diatoms in the Gulf of Finland and the Gulf of Bothnia. The variation in species richness was best explained by pH, total phosphorus and total nitrogen. Redundancy Analysis indicated that the most important factors correlating with species composition were air temperature, silicon, total phosphorus, water temperature, salinity and pH. Variation Partitioning showed that the species composition was mostly affected by climatic and spatial variables, whereas physicochemical variables had little impact. However, the strongest factor was the combined influence of climatic, spatial and physicochemical variables. The results suggest that diatom species richness in the northern Baltic Sea is primarily regulated by local factors, while climatic and spatial variables have little impact on richness. Species composition is mostly affected by climatic and spatial variables. We conclude that understanding the distribution patterns of Baltic Sea diatoms requires the inclusion of climatic, spatial and water chemistry variables.

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波罗的海沿气候，空间和理化变量分布的上石硅藻分布模式

在北欧的波罗的海研究了硅藻群落的物种丰富度和群落组成，以增强对咸淡水生态系统中这些生物多样性的认识。波罗的海的许多生物已经得到了广泛的研究，但是研究沿海硅藻的研究却很少。这项研究的目的是研究气候，空间和水的物理化学变量在芬兰湾和博特尼亚湾中作为表观硅藻的驱动因素的重要性。物种丰富度的变化最好用pH，总磷和总氮来解释。冗余分析表明，与物种组成相关的最重要因素是气温，硅，总磷，水温，盐度和pH。变异划分表明，物种组成主要受气候和空间变量的影响，而理化变量的影响很小。但是，最主要的因素是气候，空间和物理化学变量的综合影响。结果表明，波罗的海北部硅藻的物种丰富度主要受当地因素的影响，而气候和空间变量对物种丰富度的影响很小。物种组成主要受气候和空间变量的影响。我们得出的结论是，了解波罗的海硅藻的分布模式需要包括气候，空间和水化学变量。最强的因素是气候，空间和物理化学变量的综合影响。结果表明，波罗的海北部硅藻的物种丰富度主要受当地因素的影响，而气候和空间变量对物种丰富度的影响很小。物种组成主要受气候和空间变量的影响。我们得出的结论是，了解波罗的海硅藻的分布模式需要包括气候，空间和水化学变量。最强的因素是气候，空间和物理化学变量的综合影响。结果表明，波罗的海北部硅藻的物种丰富度主要受当地因素的影响，而气候和空间变量对物种丰富度的影响很小。物种组成主要受气候和空间变量的影响。我们得出的结论是，了解波罗的海硅藻的分布方式需要包括气候，空间和水化学变量。