Seasonality of Coastal Picophytoplankton Growth, Nutrient Limitation, and Biomass Contribution

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Alegria Zufia, JavierLinnéuniversitetet,Institutionen för biologi och miljö (BOM),Ctr Ecol & Evolut Microbial Model Syst EEMiS;MPEA,EcoChange,Linnaeus University, Kalmar, Sweden (author)

Seasonality of Coastal Picophytoplankton Growth, Nutrient Limitation, and Biomass Contribution

Article/chapterEnglish2021

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2021-12-06
Lausanne :Frontiers Media S.A.2021
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LIBRIS-ID:oai:DiVA.org:lnu-109655
https://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-109655URI
https://doi.org/10.3389/fmicb.2021.786590DOI
https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-201820URI
https://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-46472URI

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Language:English
Summary in:English

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Subject category:art swepub-publicationtype

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Picophytoplankton in the Baltic Sea includes the simplest unicellular cyanoprokaryotes (Synechococcus/Cyanobium) and photosynthetic picoeukaryotes (PPE). Picophytoplankton are thought to be a key component of the phytoplankton community, but their seasonal dynamics and relationships with nutrients and temperature are largely unknown. We monitored pico- and larger phytoplankton at a coastal site in Kalmar Sound (K-Station) weekly during 2018. Among the cyanoprokaryotes, phycoerythrin-rich picocyanobacteria (PE-rich) dominated in spring and summer while phycocyanin-rich picocyanobacteria (PC-rich) dominated during autumn. PE-rich and PC-rich abundances peaked during summer (1.1 x 10(5) and 2.0 x 10(5) cells mL(-1)) while PPE reached highest abundances in spring (1.1 x 10(5) cells mL(-1)). PPE was the main contributor to the total phytoplankton biomass (up to 73%). To assess nutrient limitation, bioassays with combinations of nitrogen (NO3 or NH4) and phosphorus additions were performed. PE-rich and PC-rich growth was mainly limited by nitrogen, with a preference for NH4 at >15 degrees C. The three groups had distinct seasonal dynamics and different temperature ranges: 10 degrees C and 17-19 degrees C for PE-rich, 13-16 degrees C for PC-rich and 11-15 degrees C for PPE. We conclude that picophytoplankton contribute significantly to the carbon cycle in the coastal Baltic Sea and underscore the importance of investigating populations to assess the consequences of the combination of high temperature and NH4 in a future climate.

Subject headings and genre

NATURVETENSKAP Biologi Ekologi hsv//swe
NATURAL SCIENCES Biological Sciences Ecology hsv//eng
Synechococcus
picoeukaryotes
phycoerythrin
phycocyanin
Baltic Sea
nitrate
ammonium
temperature
Aquatic Ecology
Akvatisk ekologi

Added entries (persons, corporate bodies, meetings, titles ...)

Farnelid, Hanna,1983-Linnéuniversitetet,Institutionen för biologi och miljö (BOM),Vatten,Ctr Ecol & Evolut Microbial Model Syst EEMiS;MPEA,EcoChange,Linnaeus University, Kalmar, Sweden(Swepub:lnu)efaha (author)
Legrand, Catherine,Professor,1965-Högskolan i Halmstad,Linnéuniversitetet,Institutionen för biologi och miljö (BOM),Vatten,Halmstad University, Sweden,Ctr Ecol & Evolut Microbial Model Syst EEMiS;MPEA,EcoChange,Akademin för företagande, innovation och hållbarhet,Linnaeus University, Kalmar, Sweden(Swepub:hh)catleg (author)
LinnéuniversitetetInstitutionen för biologi och miljö (BOM) (creator_code:org_t)

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In:Frontiers in MicrobiologyLausanne : Frontiers Media S.A.121664-302X

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