Phytoplankton community composition during contrasting winter conditions in a shallow bay in the northern Baltic Sea
During 2019–20, the most severe wintertime marine heatwave since 2000–01 swept through the Baltic Sea. Sea ice was practically non-existent during this time, which is unusual for the northern Baltic Sea. The consequences for the phytoplankton community due to winter-time heatwaves are still unknown....
Main Author: | |
---|---|
Other Authors: | |
Format: | Thesis |
Language: | English |
Published: |
2023
|
Subjects: | |
Online Access: | https://www.doria.fi/handle/10024/188237 |
id |
ftdoria:oai:www.doria.fi:10024/188237 |
---|---|
record_format |
openpolar |
spelling |
ftdoria:oai:www.doria.fi:10024/188237 2024-01-07T09:46:38+01:00 Phytoplankton community composition during contrasting winter conditions in a shallow bay in the northern Baltic Sea Växtplanktonsamhällets sammansättning under motsatta vinterförhållanden i en grund havsvik i norra Östersjön Skrifvars, Amalia Åbo Akademi, Fakulteten för naturvetenskaper och teknik, Miljö- och marinbiologi 2023 47 true https://www.doria.fi/handle/10024/188237 en eng https://www.doria.fi/handle/10024/188237 URN:NBN:fi-fe20231128149646 This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden. Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty. benthic coupling phytoplankton cold-water period sympagic pelagic Baltic Sea spring bloom diatoms dinoflagellates plankton ice cover winter composition (consistency) biomass (ecology) kiselalger dinoflagellater istäcke vinter sammansättning (fysiska egenskaper) biomassa (ekologi) piilevät panssarilevät jääpeite talvi koostumus biomassa (ekologia) 1183 Växtbiologi mikrobiologi virologi Avhandling pro gradu 2023 ftdoria 2023-12-14T00:07:02Z During 2019–20, the most severe wintertime marine heatwave since 2000–01 swept through the Baltic Sea. Sea ice was practically non-existent during this time, which is unusual for the northern Baltic Sea. The consequences for the phytoplankton community due to winter-time heatwaves are still unknown. However, it is likely that not just biomass, but also community composition during winter and subsequent spring are altered. For example, dinoflagellates may receive a head start during spring blooms after warm winters and their relative abundance could increase compared to the abundance of diatoms. During cold winters, sea ice has a strong influence on the pelagic phytoplankton community in spring. Seeding from the ice would give the dominating sympagic phytoplankton group a head start during spring blooms. Dinoflagellate cysts are better at binding carbon than diatom spores. In the long-term dinoflagellates could potentially alleviate eutrophication if they are not resuspended and germinated during cold winters. The aim of the study was to compare the pelagic phytoplankton community during the ice-free cold-water period 2019–20 to the ice-covered cold-water period 2021–22, as well as investigate the potential seeding effect of the sympagic to the pelagic. Sampling occurred in the shallow bay Sjöviken, in the northwest of Åland. Phytoplankton were identified through microscopy using an inverted phase-contrast microscope. Environmental and biotic variables between the two cold-water periods were modelled using a generalized additive model. Total community biomass was significantly higher during 2021–22. Ice cover and a significantly higher total phosphorus concentration in the pelagic during 2021–22 might be the reason for this. The biomass was strongly dominated by dinoflagellates during 2021–22, while the low biomass of 2019–20 consisted of virtually no dinoflagellates. Diatoms dominated during 2019–20. Results are in contradiction to earlier studies, where warmer winters resulted in a dominance of dinoflagellates ... Thesis Sea ice Doria (National Library of Finland) Shallow Bay ENVELOPE(67.467,67.467,-67.817,-67.817) |
institution |
Open Polar |
collection |
Doria (National Library of Finland) |
op_collection_id |
ftdoria |
language |
English |
topic |
benthic coupling phytoplankton cold-water period sympagic pelagic Baltic Sea spring bloom diatoms dinoflagellates plankton ice cover winter composition (consistency) biomass (ecology) kiselalger dinoflagellater istäcke vinter sammansättning (fysiska egenskaper) biomassa (ekologi) piilevät panssarilevät jääpeite talvi koostumus biomassa (ekologia) 1183 Växtbiologi mikrobiologi virologi |
spellingShingle |
benthic coupling phytoplankton cold-water period sympagic pelagic Baltic Sea spring bloom diatoms dinoflagellates plankton ice cover winter composition (consistency) biomass (ecology) kiselalger dinoflagellater istäcke vinter sammansättning (fysiska egenskaper) biomassa (ekologi) piilevät panssarilevät jääpeite talvi koostumus biomassa (ekologia) 1183 Växtbiologi mikrobiologi virologi Skrifvars, Amalia Phytoplankton community composition during contrasting winter conditions in a shallow bay in the northern Baltic Sea |
topic_facet |
benthic coupling phytoplankton cold-water period sympagic pelagic Baltic Sea spring bloom diatoms dinoflagellates plankton ice cover winter composition (consistency) biomass (ecology) kiselalger dinoflagellater istäcke vinter sammansättning (fysiska egenskaper) biomassa (ekologi) piilevät panssarilevät jääpeite talvi koostumus biomassa (ekologia) 1183 Växtbiologi mikrobiologi virologi |
description |
During 2019–20, the most severe wintertime marine heatwave since 2000–01 swept through the Baltic Sea. Sea ice was practically non-existent during this time, which is unusual for the northern Baltic Sea. The consequences for the phytoplankton community due to winter-time heatwaves are still unknown. However, it is likely that not just biomass, but also community composition during winter and subsequent spring are altered. For example, dinoflagellates may receive a head start during spring blooms after warm winters and their relative abundance could increase compared to the abundance of diatoms. During cold winters, sea ice has a strong influence on the pelagic phytoplankton community in spring. Seeding from the ice would give the dominating sympagic phytoplankton group a head start during spring blooms. Dinoflagellate cysts are better at binding carbon than diatom spores. In the long-term dinoflagellates could potentially alleviate eutrophication if they are not resuspended and germinated during cold winters. The aim of the study was to compare the pelagic phytoplankton community during the ice-free cold-water period 2019–20 to the ice-covered cold-water period 2021–22, as well as investigate the potential seeding effect of the sympagic to the pelagic. Sampling occurred in the shallow bay Sjöviken, in the northwest of Åland. Phytoplankton were identified through microscopy using an inverted phase-contrast microscope. Environmental and biotic variables between the two cold-water periods were modelled using a generalized additive model. Total community biomass was significantly higher during 2021–22. Ice cover and a significantly higher total phosphorus concentration in the pelagic during 2021–22 might be the reason for this. The biomass was strongly dominated by dinoflagellates during 2021–22, while the low biomass of 2019–20 consisted of virtually no dinoflagellates. Diatoms dominated during 2019–20. Results are in contradiction to earlier studies, where warmer winters resulted in a dominance of dinoflagellates ... |
author2 |
Åbo Akademi, Fakulteten för naturvetenskaper och teknik, Miljö- och marinbiologi |
format |
Thesis |
author |
Skrifvars, Amalia |
author_facet |
Skrifvars, Amalia |
author_sort |
Skrifvars, Amalia |
title |
Phytoplankton community composition during contrasting winter conditions in a shallow bay in the northern Baltic Sea |
title_short |
Phytoplankton community composition during contrasting winter conditions in a shallow bay in the northern Baltic Sea |
title_full |
Phytoplankton community composition during contrasting winter conditions in a shallow bay in the northern Baltic Sea |
title_fullStr |
Phytoplankton community composition during contrasting winter conditions in a shallow bay in the northern Baltic Sea |
title_full_unstemmed |
Phytoplankton community composition during contrasting winter conditions in a shallow bay in the northern Baltic Sea |
title_sort |
phytoplankton community composition during contrasting winter conditions in a shallow bay in the northern baltic sea |
publishDate |
2023 |
url |
https://www.doria.fi/handle/10024/188237 |
long_lat |
ENVELOPE(67.467,67.467,-67.817,-67.817) |
geographic |
Shallow Bay |
geographic_facet |
Shallow Bay |
genre |
Sea ice |
genre_facet |
Sea ice |
op_relation |
https://www.doria.fi/handle/10024/188237 URN:NBN:fi-fe20231128149646 |
op_rights |
This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden. Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty. |
_version_ |
1787428488448311296 |