Effects of Recreational Boating on Microbial and Meiofauna Diversity in Coastal Shallow Ecosystems of the Baltic Sea

Iburg, Sven; Shen, Dandan; Austin, Åsa N.; Hansen, Joakim P.; Eklöf, Johan; Nascimento, Francisco J. A.

doi:10.1128/msphere.00127-21

Cited by 7 publications

(3 citation statements)

References 106 publications

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“…Within these major groups there were both facultative sediment dwellers as well as those organisms that only spend part of their life cycle in the sediment, e.g., as resting stages ( Fryxell, 1983 ; Lewis et al, 1999 ; McQuoid et al, 2002 ; Ellegaard and Ribeiro, 2018 ). This is in line with other studies demonstrating that eukaryotes in sediments have diverse communities with different dominance patterns, e.g., diatoms, maxillopods, or dinoflagellates ( Salonen et al, 2019 ; Iburg et al, 2021 ; Lalzar et al, 2023 ). The largest phyla and family level community differences between the bays were present in spring and summer with a tendency toward more diatoms in the control bay (∼75% relative abundance), whereas dinoflagellates contributed more to the relative abundance in the heated bay, albeit not significantly.…”

Section: Discussionsupporting

confidence: 93%

Baltic Sea coastal sediment-bound eukaryotes have increased year-round activities under predicted climate change related warming

Li,

Nilsson,

Seidel

et al. 2024

Front. Microbiol.

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Climate change related warming is a serious environmental problem attributed to anthropogenic activities, causing ocean water temperatures to rise in the coastal marine ecosystem since the last century. This particularly affects benthic microbial communities, which are crucial for biogeochemical cycles. While bacterial communities have received considerable scientific attention, the benthic eukaryotic community response to climate change remains relatively overlooked. In this study, sediments were sampled from a heated (average 5°C increase over the whole year for over 50 years) and a control (contemporary conditions) Baltic Sea bay during four different seasons across a year. RNA transcript counts were then used to investigate eukaryotic community changes under long-term warming. The composition of active species in the heated and control bay sediment eukaryotic communities differed, which was mainly attributed to salinity and temperature. The family level RNA transcript alpha diversity in the heated bay was higher during May but lower in November, compared with the control bay, suggesting altered seasonal activity patterns and dynamics. In addition, structures of the active eukaryotic communities varied between the two bays during the same season. Hence, this study revealed that long-term warming can change seasonality in eukaryotic diversity patterns. Relative abundances and transcript expression comparisons between bays suggested that some taxa that now have lower mRNA transcripts numbers could be favored by future warming. Furthermore, long-term warming can lead to a more active metabolism in these communities throughout the year, such as higher transcript numbers associated with diatom energy production and protein synthesis in the heated bay during winter. In all, these data can help predict how future global warming will affect the ecology and metabolism of eukaryotic community in coastal sediments.

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Section: Discussionsupporting

confidence: 93%

Baltic Sea coastal sediment-bound eukaryotes have increased year-round activities under predicted climate change related warming

Li,

Nilsson,

Seidel

et al. 2024

Front. Microbiol.

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“…Burkholderiaceae was the most significant bioindicator taxa identified in this study. Burkholderiaceae are associated with organic contaminants and have been detected in greater abundance in coastal shallow ecosystems such as in the Baltic Sea and south China sea, where they have been partially affected by anthropogenic activities ( Iburg et al, 2021 ; Zhang et al, 2021 ). Some of the sampling locations in this study included continental shelf seas and near coastal estuaries, which could be impacted by pollutants, leading to anthropogenic influences.…”

Section: Discussionmentioning

confidence: 99%

Microbial community structures and important taxa across oxygen gradients in the Andaman Sea and eastern Bay of Bengal epipelagic waters

Guo

Zhang

et al. 2022

Front. Microbiol.

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In oceanic oxygen minimum zones (OMZs), the abundances of aerobic organisms significantly decrease and energy shifts from higher trophic levels to microorganisms, while the microbial communities become critical drivers of marine biogeochemical cycling activities. However, little is known of the microbial ecology of the Andaman Sea and eastern Bay of Bengal (BoB) OMZs. In the present study, a total of 131 samples which from the Andaman Sea and eastern BoB epipelagic waters were analyzed. The microbial community distribution patterns across oxygen gradients, including oxygenic zones (OZs, dissolved oxygen [DO] ≥ 2 mg/L), oxygen limited zones (OLZs, 0.7 mg/L < DO < 2 mg/L), and OMZs (DO ≤ 0.7 mg/L), were investigated. Mantel tests and Spearman’s correlation analysis revealed that DO was the most important driver of microbial community structures among several environmental factors. Microbial diversity, richness, and evenness were highest in the OLZs and lowest in the OZs. The microbial community compositions of OZ and OMZ waters were significantly different. Random forest analysis revealed 24 bioindicator taxa that differentiated OZ, OLZ, and OMZ water communities. These bioindicator taxa included Burkholderiaceae, HOC36, SAR11 Clade IV, Thioglobaceae, Nitrospinaceae, SAR86, and UBA10353. Further, co-occurrence network analysis revealed that SAR202, AEGEAN-169, UBA10353, SAR406, and Rhodobacteraceae were keystone taxa among the entire interaction network of the microbial communities. Functional prediction further indicated that the relative abundances of microbial populations involved in nitrogen and sulfur cycling were higher in OMZs. Several microbial taxa, including the Thioglobaceae, Nitrospinaceae, SAR202, SAR406, WPS-2, UBA10353, and Woeseiaceae, may be involved in nitrogen and/or sulfur cycling, while also contributing to oxygen consumption in these waters. This study consequently provides new insights into the microbial community structures and potentially important taxa that contribute to oxygen consumption in the Andaman Sea and eastern BoB OMZ.

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“…Another interesting result of our study was the positive correlation between meiofauna and the microbial content of the freshwater sources (CLP, TRI, and DIP with TC; OST and CLA with Ec; and CLP with CF and YM) (Table S6), which reflected the preference of these organisms for organic-rich habitats. Microbial and meiofauna abundances and diversities were also reported to respond positively to high levels of organic matter in coastal, shallow ecosystems from the Baltic Sea [109]. The association between the chemical compound diversity in freshwaters and micro-organisms and their potential to decompose plant litter has been previously reported [110], as well as the meiofauna influences on the microbial and organic matter dynamics through consumption and bioturbation [111,112].…”

Section: Meiofaunamentioning

confidence: 79%

The Interplay of Environment and Biota in Assessing the Freshwater Quality in Karst

Borda

Cociuba

Epure³

et al. 2022

Diversity

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Karst aquifers are both a valuable resource for humankind and a habitat for unique biota. The quality of freshwater sources may be easily affected by natural (e.g., geology, climate, and vegetation) and anthropogenic (e.g., agriculture, livestock, and tourism) changes, particularly in karst landscapes with highly vulnerable groundwater reservoirs. We seasonally monitored nine representative freshwater sources (i.e., six springs, a well, a surface stream, and a cave stream resurgence) in the karst system of the Runcuri Plateau (KSRP) (Western Romanian Carpathians) during seven sampling campaigns in 2019–2021. We assessed how these natural and anthropogenic factors influenced the water quality based on the European and national standards for drinking water. The geological structure (i.e., tectonics and lithology) of the KSRP was reassessed, and the environmental variables of the freshwater sites were investigated in order to evaluate their impact on the physicochemical profile, the microbial contamination, and on the meiofauna presence. Multivariate statistics were performed to gain insights into the interplay among all these factors and to evaluate the self-purification capacity of the KSRP for chemical and microbial pollutants. The most relevant drivers shaping the microbial content of the freshwater sources were the altitude of the sampling sites, the normalized difference vegetation index (NDVI), and air temperature, followed by the physicochemical profile of the waters (i.e., calcium hardness, magnesium hardness, nitrites, nitrates, conductivity, phosphates, total dissolved solids, and iron concentrations). The meiofauna presence was influenced mostly by precipitation, air temperature, and NDVI. Our results reflected the effect of the geological structure and environment on water chemistry and biota assemblages. A pollutant attenuation trend was observed in discharging waters, even though the self-purification capacity of the studied karst system was not statistically supported. More investigations are needed to comprehend the processes developed in the black box of the KSRP.

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Effects of Recreational Boating on Microbial and Meiofauna Diversity in Coastal Shallow Ecosystems of the Baltic Sea

Cited by 7 publications

References 106 publications

Baltic Sea coastal sediment-bound eukaryotes have increased year-round activities under predicted climate change related warming

Baltic Sea coastal sediment-bound eukaryotes have increased year-round activities under predicted climate change related warming

Microbial community structures and important taxa across oxygen gradients in the Andaman Sea and eastern Bay of Bengal epipelagic waters

The Interplay of Environment and Biota in Assessing the Freshwater Quality in Karst

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