Phytoplankton Composition and Ecological Tolerance of the Autotrophic Picoplankton in Atanasovsko Lake (Black Sea Coastal Lagoon, Bulgaria)

Belkinova, Detelina; Teneva, Ivanka; Basheva, Diyana; Neykov, N.; Moten, Dzhemal; Gecheva, Gana; Аpostolova, Emilia; Naimov, Samir

doi:10.15666/aeer/1902_849866

Cited by 3 publications

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“…Picophytoplankton have been found to be important at extreme and highly variable salinities, e.g. in hypersaline lakes and in the Black Sea (Belkinova et al, 2021; Somogyi et al, 2022) and at intermediate salinities (e.g. 5 - 10 PSU) in estuaries (Wetz et al, 2011), which are somewhat extreme for both freshwater and saltwater inhabitants.…”

Section: Discussionmentioning

confidence: 99%

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Picophytoplankton dominate phytoplankton communities in the Elbe estuary in terms of cell counts

Martens,

Biederbick,

Schaum

2024

Preprint

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Summary(1)Picophytoplankton are important primary producers, but not always adequately recognized, e.g. due to methodological limitations.(2)In this study, we combined flow cytometry and metabarcoding to investigate seasonal and spatial patterns of picophytoplankton abundance and community composition in the Elbe estuary.(3)Picophytoplankton (mostly picoeukaryotes such asMychonastesandMinidiscus)contributed on average 70 % (SD = 14 %) to the total phytoplankton counts. In the summer picocyanobacteria (e.g.Synechococcus) played a more significant role. The contributions of picophytoplankton to the total phytoplankton were particularly high from summer to winter as well as in the mid estuary. However, at salinities of around 10 PSU in the mixing area the proportion of picophytoplankton was comparably low (average 49 %, SD = 13 %).(4)Our results indicate that picophytoplankton prevail in the Elbe estuary year-round with respect to cell counts. Picophytoplankton could occupy important niche positions to maintain primary production under extreme conditions where larger phytoplankton might struggle (e.g. at high or low temperature and high turbidity), and also benefit from high nutrient availability here. However, we did not find evidence that they played a particularly significant role at the salinity interface. Our study highlights the importance of including picophytoplankton when assessing estuarine phytoplankton as has been suggested for other ecosystems such as oceans.

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Section: Discussionmentioning

confidence: 99%

“…Some picophytoplankton have been shown to appear under extreme conditions e.g. at high or varying salinity, turbidity and temperature (Belkinova et al, 2021; Somogyi et al, 2022).…”

Section: Introductionmentioning

confidence: 99%