In order to understand the influence of summer conditions (extended daylight, warmer temperature, increased meltwater, increased suspended load and nutrient chemistry) on the distribution of phytoplankton (diatoms & flagellates) and picoplankton community in the surface waters off Svalbard, samples were collected from 6 locations around Svalbard onboard National Geographic Explorer vessel. Additionally, satellite data was obtained for surface temperature, chlorophyll a (chl a) and total suspended mass (TSM). Stations Gnålodden (S1), Bellsund (S4), Open Ocean (S5), and Magdalenefjorden (S6) were along the western coast while stations Storfjorden (S2) and Western Storfjorden (S3) were on the eastern side of Svalbard and open to Barents Sea.

Phytoplankton abundance ranged from 4 to 49 × 10³ cells L⁻¹ and were dominated by dinoflagellates such as Perdinium, Protoperidinium, Dynophysis, Gyrodinium, Gymnodinium and Torodinium species while diatoms (Navicula) were found only in colder polar waters (S5 and 6). Flowcytometry data showed the predominance of Synechococcus sp. and its abundance varied from 0.8 × 10⁵ cells L⁻¹ (S5) to 4.3 × 10⁵ cells L⁻¹ (S4). The distribution of Synechococcus was positively correlated to nitrate (r = 0.838) and chl a (r = 0.915) while phytoplankton abundance had no correlation with chl a or nitrate. A weak positive linear relation between Synechococcus and TSM suggests that melting of glaciers and influx of land run-off may be playing some role in increasing the picoplankton load in these waters. The predominance of mixotrophic dinoflagellates alongwith ciliates like Strombidium in these waters suggests that grazing of picoplankton as well as bacteria might fuel their carbon demand. Our data reflected post-spring bloom conditions wherein Synechococcus were the dominant primary producers and microbial loop might play an important role in sustaining the mixotroph population.

为了了解夏季条件（延长日光、温度升高、融水增加、悬浮负荷增加和营养化学）对斯瓦尔巴群岛近海地表水中浮游植物（硅藻和鞭毛虫）和微型浮游生物群落分布的影响，从斯瓦尔巴群岛周围的 6 个地点在国家地理探险家船上。此外，对于表面温度下获得卫星数据，叶绿素一个（CHL一个）和总悬挂质量（TSM）。Gnålodden (S1)、Bellsund (S4)、Open Ocean (S5) 和 Magdalenefjorden (S6) 站位于西海岸，而 Storfjorden (S2) 和 Western Storfjorden (S3) 站位于斯瓦尔巴群岛的东侧，向巴伦支群岛开放海。

浮游植物丰度范围为 4 到 49 × 10 ³ 细胞 L ^-1并以鞭毛藻为主，如Perdinium、Protoperidinium、Dynophysis、Gyrodinium、Gymnodinium和Torodinium物种，而硅藻（Navicula）仅在较冷的极地水域（S5 和 6）中发现. 流式细胞术数据显示聚球藻属的优势。其丰度从0.8 × 10 ^{5 个} 细胞L ^-1 (S5) 到4.3 × 10 ^{5 个} 细胞L ^-1 (S4) 不等。分布聚球蓝细菌呈正为硝酸盐（R = 0.838）和CH1相关一(r = 0.915) 而浮游植物丰度与叶绿素a或硝酸盐没有相关性。聚球藻和 TSM之间的弱正线性关系表明冰川融化和陆地径流的流入可能在增加这些水域中的微型浮游生物负荷方面发挥了一定作用。混合营养甲藻非常久远像纤毛虫的优势急游虫在这些水域表明，超微型浮游生物以及细菌的放牧可能助长他们的碳需求。我们的数据反映了春季开花后的条件，其中聚球藻是主要的初级生产者，微生物环可能在维持混合营养种群方面发挥重要作用。