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Phytoplankton trends in the Baltic Sea

机译:波罗的海的浮游植物趋势

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摘要

Monitoring data of phytoplankton abundance and biomass (1979-1999) and Chl. a (1979-2000) from surface samples (0-10m) of the Kattegat, Belt Sea and Baltic proper were investigated for long-term trends. The Mann―Kendall test as well as the LOESS smoother was applied for three taxonomic groups in spring, summer and autumn separately. Chl. a trends were analysed by linear regression. Downward trends were found for diatoms in spring and summer whereas dinoflagellates generally increased in the Baltic proper but decreased in the Kattegat. In autumn, diatoms increased at some stations. For cyano-bacleria, downward trends were detected mainly in the Kattegat/Belt Sea area. Chl. a concentrations showed a general decrease in the Kattegat/Belt Sea area but an increase in the Baltic proper. Observed changes in trends during the two decades might indicate shifts in the ecosystem.
机译:浮游植物丰度和生物量的监测数据(1979-1999年)和Chl。考察了Kattegat,贝尔特海和波罗的海的地表样品(0-10m)的a(1979-2000)的长期趋势。分别在春季,夏季和秋季将Mann-Kendall测试以及LOESS平滑器应用于三个分类组。 Chl。通过线性回归分析趋势。在春季和夏季发现硅藻呈下降趋势,而在波罗的海地区硅藻鞭毛通常增加,但在Kattegat则减少。秋季,一些站点的硅藻增加。对于蓝藻,主要在卡特加特海峡/海带海域发现下降趋势。 Chl。浓度显示,Kattegat / Belt海域总体减少,但波罗的海自然体增加。在过去的二十年中观察到的趋势变化可能表明生态系统发生了变化。

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