scholarly journals Phytoplankton settling quality has a subtle but significant effect on sediment microeukaryotic and bacterial communities

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Séréna Albert ◽  
Per Hedberg ◽  
Nisha H. Motwani ◽  
Sara Sjöling ◽  
Monika Winder ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Bacterial Communities ◽  
Food Resource ◽  
Ecosystem Functions ◽  
Filamentous Cyanobacterium ◽  
The Baltic Sea ◽  
Denitrification Gene ◽  
Phytoplankton Communities ◽  
The Baltic ◽  
And Function

AbstractIn coastal aphotic sediments, organic matter (OM) input from phytoplankton is the primary food resource for benthic organisms. Current observations from temperate ecosystems like the Baltic Sea report a decline in spring bloom diatoms, while summer cyanobacteria blooms are becoming more frequent and intense. These climate-driven changes in phytoplankton communities may in turn have important consequences for benthic biodiversity and ecosystem functions, but such questions are not yet sufficiently explored experimentally. Here, in a 4-week experiment, we investigated the response of microeukaryotic and bacterial communities to different types of OM inputs comprising five ratios of two common phytoplankton species in the Baltic Sea, the diatom Skeletonema marinoi and filamentous cyanobacterium Nodularia spumigena. Metabarcoding analyses on 16S and 18S ribosomal RNA (rRNA) at the experiment termination revealed subtle but significant changes in diversity and community composition of microeukaryotes in response to settling OM quality. Sediment bacteria were less affected, although we observed a clear effect on denitrification gene expression (nirS and nosZ), which was positively correlated with increasing proportions of cyanobacteria. Altogether, these results suggest that future changes in OM input to the seafloor may have important effects on both the composition and function of microbenthic communities.

Comparative analysis of ammonia-oxidizing bacterial communities in two lakes in North Germany and the Baltic Sea

2006 ◽  
Vol 167 (1-4) ◽  
pp. 335-350 ◽  
Author(s):  
Ok-Sun Kim ◽  
Pilar Junier ◽  
Johannes F. Imhoff ◽  
Karl-Paul Witzel
Keyword(s):  
Comparative Analysis ◽  
Baltic Sea ◽  
Bacterial Communities ◽  
The Baltic Sea ◽  
North Germany ◽  
The Baltic

Succession of sea-ice bacterial communities in the Baltic Sea fast ice

Polar Biology ◽  
2008 ◽  
Vol 31 (7) ◽  
pp. 783-793 ◽  
Author(s):  
Hermanni Kaartokallio ◽  
Jaana Tuomainen ◽  
Harri Kuosa ◽  
Jorma Kuparinen ◽  
Pertti J. Martikainen ◽  
...  
Keyword(s):  
Sea Ice ◽  
Baltic Sea ◽  
Bacterial Communities ◽  
The Baltic Sea ◽  
Fast Ice ◽  
The Baltic

scholarly journals Is there a BMAA transfer in the pelagic and benthic food webs in the Baltic Sea?

2018 ◽  
Author(s):  
Nadezda Zguna ◽  
Agnes Karlson ◽  
Leopold L. Ilag ◽  
Andrius Garbaras ◽  
Elena Gorokhova
Keyword(s):  
Baltic Sea ◽  
Food Webs ◽  
Food Chain ◽  
Benthic Invertebrates ◽  
The Baltic Sea ◽  
Phytoplankton Communities ◽  
Benthic Food ◽  
Benthic Food Webs ◽  
The Baltic ◽  
Analytical Approaches

AbstractThe evidence regarding BMAA occurrence in the Baltic Sea is contradictory, with benthic sources appearing to be more important than pelagic ones. The latter is counterintuitive considering that pelagic primary producers, such as diatoms, dinoflagellates, and cyanobacteria, are the only plausible source of this compound in the food webs. To elucidate BMAA distribution in trophic pathways, we analyzed BMAA in the pelagic and benthic food webs sampled in summer 2010 in the Northern Baltic Proper. As potential BMAA sources, phytoplankton communities in early and late summer were used. As pelagic consumers, zooplankton, mysids and zooplanktivorous fish (herring) were used, whereas benthic invertebrates (amphipods, priapulids, polychaetes, and clams) and benthivorous fish (perch and flounder) represented the benthic food chain. To establish the trophic structure of the system, the stable isotope (δ13C and δ15N) composition of its components was determined. Contrary to the reported ubiquitous occurrence of BMAA in the Baltic food webs, only phytoplankton and lower consumers (zooplankton and mysids) of the pelagic food chain tested positive. Given that our analytical approaches were adequate, we conclude that no measurable levels of this compound occurred in the benthic invertebrates and any of the tested fish species in the study area. These findings indicate that widely assumed presence and transfer of BMAA to the top consumers in the food webs of the Baltic Sea and, possibly, other systems remain an open question. More controlled experiments and field observations are needed to understand the transfer and possible transformation of BMAA in the food web under various environmental settings.

scholarly journals Viability of pico- and nanophytoplankton in the Baltic Sea during spring

2019 ◽  
Vol 54 (1) ◽  
pp. 119-135 ◽  
Author(s):  
Mari Vanharanta ◽  
Samu Elovaara ◽  
Daniel J. Franklin ◽  
Kristian Spilling ◽  
Tobias Tamelander
Keyword(s):  
Cell Death ◽  
Cell Viability ◽  
Baltic Sea ◽  
Abiotic Factors ◽  
The Baltic Sea ◽  
Sytox Green ◽  
Species Succession ◽  
Phytoplankton Communities ◽  
Phytoplankton Cell ◽  
The Baltic

Abstract Phytoplankton cell death is an important process in marine food webs, but the viability of natural phytoplankton communities remains unexplored in many ecosystems. In this study, we measured the viability of natural pico- and nanophytoplankton communities in the central and southern parts of the Baltic Sea (55°21′ N, 17°06′ E–60°18′ N, 19°14′ E) during spring (4th–15th April 2016) to assess differences among phytoplankton groups and the potential relationship between cell death and temperature, and inorganic nutrient availability. Cell viability was determined by SYTOX Green cell staining and flow cytometry at a total of 27 stations representing differing hydrographic regimes. Three general groups of phytoplankton (picocyanobacteria, picoeukaryotes, and nanophytoplankton) were identified by cytometry using pigment fluorescence and light scatter characteristics. The picocyanobacteria and picoeukaryotes had significantly higher cell viability than the nanophytoplankton population at all depths throughout the study area. Viability correlated positively with the photosynthetic efficiency (Fv/Fm, maximum quantum yield of photosystem II) as measured on the total phytoplankton community. However, an anticipated correlation with dissolved organic carbon was not observed. We found that the abiotic factors suggested to affect phytoplankton viability in other marine ecosystems were not as important in the Baltic Sea, and other biotic processes, e.g. processes related to species succession could have a more pronounced role.

scholarly journals Bacterioplankton dynamics driven by inter-annual variation in phytoplankton spring bloom communities in the Baltic Sea

2019 ◽  
Author(s):  
María Teresa Camarena-Gómez ◽  
Clara Ruiz-González ◽  
Jonna Piiparinen ◽  
Tobias Lipsewers ◽  
Cristina Sobrino ◽  
...  
Keyword(s):  
Community Structure ◽  
Bacterial Community ◽  
Baltic Sea ◽  
Carbon Cycling ◽  
Bacterial Production ◽  
Bacterial Community Structure ◽  
Spring Bloom ◽  
The Baltic Sea ◽  
The Baltic ◽  
And Function

AbstractIn the Baltic Sea, climate change has caused shifts in the phytoplankton spring bloom communities with co-occurrence of diatoms and dinoflagellates. Such changes likely affect the composition and function of associated bacterioplankton, key members of the carbon cycling, although the actual effects are unknown. To understand how changes in phytoplankton impact on bacterioplankton composition and function, we analysed bacterioplankton communities and their production during different phases of the spring bloom in four consecutive years across the Baltic Sea, and related them to environmental variables. Phytoplankton communities varied largely in composition, modifying the taxonomic structure and richness of the associated bacterioplankton assemblages. In presence of certain diatoms (Achnanthes taeniata, Skeletonema costatum and Chaetoceros spp.), bacterial production and diversity were high and with more relative abundance of Flavobacteriia, Gammaproteobacteria and Betaproteobacteria. This bacterial community structure correlated positively with high diatom biomass and with high bacterial production rates. In contrast, during dinoflagellate-dominated blooms or when the diatom Thalassiosira baltica was abundant, both bacterial production rates and diversity were low, with bacterial communities dominated by SAR11 and Rhodobacteraceae. Our results demonstrate that, changes in the phytoplankton spring bloom will have profound consequences on bacterial community structure and their role in carbon cycling.

Bacterial Diversity and Function in the Baltic Sea with an Emphasis on Cyanobacteria

AMBIO ◽  
2007 ◽  
Vol 36 (2) ◽  
pp. 180-185 ◽  
Author(s):  
Kaarina Sivonen ◽  
Katrianna Halinen ◽  
Leila M. Sihvonen ◽  
Kerttu Koskenniemi ◽  
Hanna Sinkko ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Bacterial Diversity ◽  
The Baltic Sea ◽  
The Baltic ◽  
And Function

scholarly journals Past and Current Trends of Coastal Predatory Fish in the Baltic Sea with a Focus on Perch, Pike, and Pikeperch

Fishes ◽  
2019 ◽  
Vol 4 (1) ◽  
pp. 7 ◽  
Author(s):  
Jens Olsson
Keyword(s):  
Baltic Sea ◽  
Species Interactions ◽  
Current Data ◽  
Predatory Fish ◽  
The Baltic Sea ◽  
Current Trends ◽  
Impacting Factors ◽  
Past Data ◽  
The Baltic ◽  
And Function

Coastal predatory fish are of key importance for the provisioning of ecosystem services in the Baltic Sea. Worldwide, however, there has been a general and sharp decline in predatory fish populations, in turn threatening the viability and function of marine ecosystems. On the basis of the literature, the past (data until the 2000s) and current (data until early and mid 2010s) trends in abundance of coastal predatory fish in the Baltic Sea are reviewed in this paper. Potentially important impacting factors behind the temporal development of the populations and measures to strengthen and restore them are also discussed. Available data from coastal fish monitoring programs suggest a stable or increasing abundance of coastal predatory fish as a functional group and for the species perch in the majority of areas assessed in the Baltic Sea. For pike and pikeperch, data to support assessments is scarce, but suggest substantial declines in the abundance of both species in most assessed areas. The impacting factors behind these patterns vary between species and areas, but include climate, habitat exploitation, fishing, and species-interactions in the coastal food web. Measures to restore and support coastal predatory fish communities should follow an ecosystem-based approach to management and include efforts to regulate fisheries sectors in combination with habitat protection and restoration.

Sign in / Sign up

Export Citation Format

Share Document