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on species composition and abundance. Species marked with * are potentially toxic or harmful. The Skagerrak Å17 (open Skagerrak) 8th of November The phytoplankton diversity was high whereas the total cell numbers were low. Several species more associated with the North Sea was found such as Proboscia Last updated: Nov 26, 2021

present. The integrated chlorophyll concentrations, 0-10 and 10-20 m, were within normal for this month. Phytoplankton analysis and text Ann-Turi Skjevik and Maria Karlberg Figure 2. The large diatoms Coscinodiscus centralis (left) and Chaetoceros castracanei (right) were quite numerous in the Baltic Sea Last updated: Nov 05, 2021

genus Tripos. This genus was especially common in the fluorescense peaks found at several stations along the Å-transect and at Å17 Tripos macroceros dominated. Baltic Sea Small sporadic aggregations were already seen in the Sound. In the southwestern parts of the Baltic proper grains were noted in the Last updated: Jul 19, 2021

cells from various phytoplankton groups were abundant in the Baltic Sea samples; Arrow Monoraphidium sp., arrowhead Pyramimonas sp. and star Pseudanabaena sp. Photo Ann-Turi Skjevik. Phytoplankton analysis and text Ann-Turi Skjevik and Marie Johansen 4Selection of observed species Anholt E Anholt E N14 Last updated: Sep 10, 2021

The cell concentrations were low at all stations in the Baltic Sea and at the Swedish west coast except at Å17 in the Skagerrak. The species diversity was relatively high at the Swedish west coast and low in the Baltic Sea. The integrated (0-20 m) chlorophyll a concentrations were within normal at Last updated: Apr 23, 2014

found in the North Sea were found. The integrated (0-20 m) chlorophyll concentrations were above normal at N14 Falkenberg and at both stations in the Skagerrak for this month. The integrated (0-10 m) chlorophyll concentrations that coincide with the depth of the hose samples were above what is normal at Last updated: Nov 04, 2020

. The smaller cells had a dominance of Eutreptiella spp. No results of chlorophyll were available for this station. Figure 2 Spring bloom dominated by the diatom Skeletonema marinoi was observed in the southwestern Baltic Sea. Photo M. Johansen. Figure 3 A few filaments of the cyanobacteria Last updated: Apr 06, 2021

The phytoplankton diversity and total cell numbers were relatively low as can be expected for the season. The only exception was Å17 that had quite high biodiversity. Diatoms dominated at all stations except at Släggö where dinoflagellates were more abundant. Overall the diatom Pseudo Last updated: Dec 01, 2020

Tripos. This genus was especially common in the fluorescens peaks found at about 20m at a couple of stat-ions. Baltic Sea No large surface accumulations were noted in the south of the Baltic. The wind and waves kept the filaments disper-sed in the watercolumn. The small grains of aggregations that were Last updated: Jul 19, 2021

Both the species diversity and total cell numbers were higher at Släggö (coastal station) than at Å17 (outer sea) at the time of sampling. Diatoms dominated at both stations and predominantly Guinardia flaccida was found. This species also dominated in the fluorescence peaks that were sampled. The Last updated: Jun 22, 2020