The effect of inter-annual Atlantic water inflow variability on the planktonic protist community structure in the West Spitsbergen waters during the summer

Kubiszyn, A. M.; Piwosz, Kasia; Wiktor, Jozef

doi:10.1093/plankt/fbu044

Cited by 47 publications

(51 citation statements)

References 33 publications

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“…Protist communities have been more frequently investigated during the summer season. Biodiversity seems to be higher in summer, and thus Keck et al (1999) reported 50 taxa, Okolodkov et al (2000) 40, Hop et al (2002) more than 130, Wojciechowska (2005) 39, andKubiszyn et al (2014) 162. Most of the species are of Atlantic and cosmopolitan origin, whereas only 31 (21%) are considered to be Arctic or boreal-Arctic species (Hasle and von Quillfeldt 1996).…”

Section: Primary Producersmentioning

confidence: 99%

Primary producers and production in Hornsund and Kongsfjorden – comparison of two fjord systems

Smoła¹,

Tatarek²,

Wiktor³

et al. 2017

Polish Polar Research

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Hornsund and Kongsfjorden are two similar-sized Arctic fjords on the West coast of Spitsbergen. They are influenced by cold coastal Arctic water (Hornsund) and warmer Atlantic water (Kongsfjorden). Environmental conditions affect the timing, quantity, spatial distribution (horizontal and vertical) of spring and summer blooms of protists as well as the taxonomic composition of those assemblages. Here, we compile published data and unpublished own measurement from the past two decades to compare the environmental factors and primary production in two fjord systems. Kongsfjorden is characterized by a deeper euphotic zone, higher biomass and greater proportion of autotrophic species. Hornsund seems to obtain more nutrients due to the extensive seabird colonies and exhibits higher turbidity compared to Kongsfjorden. The annual primary production in the analysed fjords ranges from 48 g C m -2 y -1 in Kongsfjorden to 216 g C m -2 y -1 in Hornsund, with a dominant component of microplankton (90%) followed by macrophytes and microphytobenthos.

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Section: Primary Producersmentioning

confidence: 99%

Primary producers and production in Hornsund and Kongsfjorden – comparison of two fjord systems

Smoła¹,

Tatarek²,

Wiktor³

et al. 2017

Polish Polar Research

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“…Teleaulax gracilis has only been described recently, with accompanying revision of the genus (Laza-Martínez et al, 2012), and therefore there are no historic records for this species. However, the related species T. acuta, has been reported to form a bloom in an Atlantic-influenced fiord in Svalbard (Kubiszyn et al, 2014). Similarly, among the Archaea, Thaumarchaeota are generally thought of as marine in Arctic estuarine systems (Galand et al, 2008a), and Group I.1a has been reported as the dominant archaeon in first-year sea-ice (Collins et al, 2010).…”

Section: Microbial Community Compositionmentioning

confidence: 99%

Microbial Community Structure and Interannual Change in the Last Epishelf Lake Ecosystem in the North Polar Region

et al. 2017

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Climate warming is proceeding rapidly in the polar regions, posing a threat to ice-dependent ecosystems. Among the most vulnerable are microbial-dominated epishelf lakes, in which surface ice-damming of an embayment causes a freshwater layer to overlie the sea, creating an interface between distinct habitats. We characterized the physicochemical and biotic environment of Milne Fiord epishelf lake (82 • N, Canada) in three successive summers (2010)(2011)(2012), and on one date of profiling (5 July 2011) we collected samples for high through-put amplicon sequencing of variable regions of small subunit rRNA to characterize the microbial community (Eukarya, Bacteria and Archaea). Potentially active water column communities were investigated using reverse-transcribed rRNA, and phytoplankton were further characterized by accessory pigment analysis. Cluster analysis of pigment data showed a demarcation between freshwater and marine communities, which was also evident in the sequence data. The halocline community of Eukarya was more similar to the deeper marine sample than to the freshwater surface community, while the Archaea and Bacteria communities at this interface clustered more with surface communities. In 2012, conductivity-depth profiles indicated shallowing of the freshwater layer and mixing across the halocline, accompanied by lower picocyanobacteria and higher picoeukaryote concentrations. Picocyanobacteria cells were more evenly distributed throughout the water column in 2012, implying partial deep mixing. Several mixotrophic taxa of Eukarya were more abundant in the freshwater layer, where low nutrient concentrations may favor this lifestyle. Unusual features of Milne Fiord microbial communities included benthic taxa not previously reported in marine water columns (notably, the archaeon Halobacteriales), and dominance by taxa that are typically present in sparse concentrations elsewhere: for example, the Chlorophyte group Radicarteria and the betaproteobacterium Rhodoferax.Thaler et al. Microbial Communities in an Ice-Dammed Arctic LakeMilne Fiord epishelf lake is the last known lake of this kind remaining in the Arctic, and the fate of this distinct microbial ecosystem may ultimately depend on the stability of the Milne Fiord ice shelf, which has experienced a negative mass balance over the past half century.

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“…As nitrate and silicic acid were depleted in the surface waters, flagellates and less silicon-requiring algae, such as P. pouchetii, were favoured over diatoms. Similarly, Kubiszyn et al (2014) noted a predominance of dinoflagellates (44%), diatoms (27%) and ciliates (13%) during summer along a longitudinal transect from the open sea to Kongsfjorden, West Svalbard.…”

Section: Summers 2007 and 2013mentioning

confidence: 78%

“…In Hornsund and Kongsfjorden, 109 taxa, 31 genera and 61 species were recorded during summer 2002 (Wiktor & Wojciechowska 2005). However, the number of taxa in Labrador fjords during both summers (90 taxa in 2007 and 101 in 2013) was 2-fold higher than in Kongsfjorden, where a maximum of 51 taxa was reported during summers (Kubiszyn et al 2014.…”

Section: Summers 2007 and 2013mentioning

confidence: 81%

Summer and fall distribution of phytoplankton in relation to environmental variables in Labrador fjords, with special emphasis on Phaeocystis pouchetii

Simo-Matchim¹,

Gosselin²,

Poulin³

et al. 2017

Mar. Ecol. Prog. Ser.

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). In autumn, the community was dominated by unidentified flagellates, prymnesiophytes and diatoms, in various proportions from early to late fall. From a summer situation characterized by stronger stratification, higher incident irradiance and depleted nutrients in surface waters, it evolved to an autumn situation characterized by decreasing air temperature and irradiance associated with an environmental forcing (e.g. weather) allowing cooling and greater vertical mixing of the water column. Combining our observations with those from the literature, we suggest the following annual succession in the Labrador fjord phytoplankton community: (winter) dinoflagellates and small flagellated cells -(spring) Fragilariopsis spp., Chaetoceros spp., Thalassiosira spp. and Phaeocystis pouchetii -(summer) Chaetoceros spp., P. pouchetii and Chrysochromulina spp. -(fall) Gymnodinium/Gyrodinium spp., Chrysochromulina spp. and other flagellates. Overall, the protist richness was 2 times higher in fall than in summer, the highest richness being observed in early fall, with 201 taxonomic entries, 72 genera and 131 species identified.

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The effect of inter-annual Atlantic water inflow variability on the planktonic protist community structure in the West Spitsbergen waters during the summer

Cited by 47 publications

References 33 publications

Primary producers and production in Hornsund and Kongsfjorden – comparison of two fjord systems

Primary producers and production in Hornsund and Kongsfjorden – comparison of two fjord systems

Microbial Community Structure and Interannual Change in the Last Epishelf Lake Ecosystem in the North Polar Region

Summer and fall distribution of phytoplankton in relation to environmental variables in Labrador fjords, with special emphasis on Phaeocystis pouchetii

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