Seasonal variation in estuarine phytoplankton viability and its relationship with carbon dynamics in the Baltic Sea

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Elovaara, S., Degerlund, M., Franklin, D.J. et al. Seasonal variation in estuarine phytoplankton viability and its relationship with carbon dynamics in the Baltic Sea. Hydrobiologia 847, 2485–2501 (2020).

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Title: Seasonal variation in estuarine phytoplankton viability and its relationship with carbon dynamics in the Baltic Sea
Author: Elovaara, Samu; Degerlund, Maria; Franklin, Daniel J.; Kaartokallio, Hermanni; Tamelander, Tobias
Publisher: Springer Link
Date: 2020
Language: en
Belongs to series: Hydrobiologia 847 11 (2020)
ISSN: 2485-2501
Abstract: Cell death drives the magnitude and community composition of phytoplankton and can result in the conversion of particulate organic carbon to dissolved organic carbon (DOC), thereby affecting carbon cycling in the aquatic food web. We used a membrane integrity probe (Sytox Green) to study the seasonal variation in the percentage of viable cells in the phytoplankton population in an estuary in the northern Baltic Sea for 21 months. The associated dissolved and particulate organic matter concentrations were also studied. The viable fraction of phytoplankton cells varied from < 20% to almost 100%, with an average of 62%. Viability was highest when a single phytoplankton group (diatoms or dinoflagellates) dominated the community. Viability of sinking phytoplankton cells, including some motile species, was in general as high as in surface water. Changes in viability were not closely related to nutrient concentrations, virus-like particle abundance, seawater temperature or salinity. There was a weak but significant negative correlation between viability and DOC, although at this location, the DOC pool was mainly influenced by the inflow of riverine water. This study demonstrates that cell viability, and its relationship with carbon export, is highly variable in the complex microbial populations common within estuarine and coastal marine ecosystems.
Subject: sytox green
cell death
organic matter sedimentation
seasonal variation
estuarine phytoplankton
carbon dynamics
Baltic Sea
dissolved organic carbon
carbon cycling
aquatic food web
membrane integrity probe
nutrient concentration
virus-like particle
seawater temperature
riverine water
carbon export
marine ecosystem
coastal marine ecosystems
Subject (ysa): POC
orgaanisen materian sedimentaatio
hiilen kierto
meren lämpötila
meriveden lämpötila
ekosysteemit (ekologia)
meren ekosysteemi
Pohjoinen Itämeri
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