Predicting the future of coastal marine ecosystems in the rapidly changing Arctic: The potential of palaeoenvironmental records

Heikkilä, Maija; Ribeiro, Sofia; Weckström, Kaarina; Pieńkowski, Anna J.

doi:10.1016/j.ancene.2021.100319

Cited by 13 publications

(8 citation statements)

References 193 publications

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“…17). While freshwater discharge is a source of organic carbon and nutrients that can enhance productivity, the lower salinity of surface waters increases vertical water column stratification 57 . Over the course of the productive season, nutrients may become depleted by the spring/early summer phytoplankton blooms, especially when the water column is strongly stratified by warm sea-surface temperatures and freshwater input.…”

Section: Environmental Preference Of Pelagic Taxa Inferred By Network...mentioning

confidence: 99%

Marine ecosystem shifts with deglacial sea-ice loss inferred from ancient DNA shotgun sequencing

et al. 2023

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Sea ice is a key factor for the functioning and services provided by polar marine ecosystems. However, ecosystem responses to sea-ice loss are largely unknown because time-series data are lacking. Here, we use shotgun metagenomics of marine sedimentary ancient DNA off Kamchatka (Western Bering Sea) covering the last ~20,000 years. We traced shifts from a sea ice-adapted late-glacial ecosystem, characterized by diatoms, copepods, and codfish to an ice-free Holocene characterized by cyanobacteria, salmon, and herring. By providing information about marine ecosystem dynamics across a broad taxonomic spectrum, our data show that ancient DNA will be an important new tool in identifying long-term ecosystem responses to climate transitions for improvements of ocean and cryosphere risk assessments. We conclude that continuing sea-ice decline on the northern Bering Sea shelf might impact on carbon export and disrupt benthic food supply and could allow for a northward expansion of salmon and Pacific herring.

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Section: Environmental Preference Of Pelagic Taxa Inferred By Network...mentioning

confidence: 99%

Marine ecosystem shifts with deglacial sea-ice loss inferred from ancient DNA shotgun sequencing

et al. 2023

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“…With the receding sea ice and shoaling of upper mixed layer, phytoplankton are subjected to increasing levels of UVR, which can negatively affect their growth and productivity [ 12 ]. Such impacts could initiate a cascading effect on the marine food web, considering that phytoplankton are an essential component of marine ecosystems [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Short-term responses of temperate and subarctic marine diatoms to Irgarol 1051 and UV radiation: Insights into temperature interactions

Bi,

Cao,

et al. 2024

PLoS ONE

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Phytoplankton face numerous pressures resulting from chemical and physical stressors, primarily induced by human activities. This study focuses on investigating the interactive effects of widely used antifouling agent Irgarol 1051 and UV radiation on the photo-physiology of marine diatoms from diverse latitudes, within the context of global warming. Our findings clearly shown that both Irgarol and UV radiation have a significant inhibitory impact on the photochemical performance of the three diatoms examined, with Irgarol treatment exhibiting more pronounced effects. In the case of the two temperate zone diatoms, we observed a decrease in the inhibition induced by Irgarol 1051 and UVR as the temperature increased up to 25°C. Similarly, for the subarctic species, an increase in temperature resulted in a reduction in the inhibition caused by Irgarol and UVR. These results suggest that elevated temperatures can mitigate the short-term inhibitory effects of both Irgarol and UVR on diatoms. Furthermore, our data indicate that increased temperature could significantly interact with UVR or Irgarol for temperate diatoms, while this was not the case for cold water diatoms, indicating temperate and subarctic diatoms may respond differentially under global warming.

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“…Sedimentary ancient DNA reveals a remarkable but challenging possibility to investigate long‐term community dynamics (Heikkilä et al., 2022; Zimmermann et al., 2020). DNA requires special environmental conditions for preservation, and DNA becomes degraded and fragmented over time once source organisms are dead (Armbrecht, 2020).…”

Section: Introductionmentioning

confidence: 99%

Glimpse of past dynamics: A new set of phytoplankton primers for sedaDNA

Romahn,

Baranski,

Schmidt

et al. 2024

Environmental DNA

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Sedimentary ancient DNA (sedaDNA) offers an important opportunity for investigating long‐term community dynamics. Nevertheless, sedaDNA is challenging since DNA is degraded and fragmented over time. Of particular interest for such sedaDNA studies are phytoplankton communities, which are sensitive environmental indicators and important producers in aquatic systems. So far, only a few suitable metabarcoding primers for sedaDNA targeting phytoplankton exist. In this study, we introduce new metabarcoding primers targeting cyanobacteria and dinoflagellates. They amplify short, ~200‐bp ribosomal 16S and 18S DNA fragments. We compared these primers against published ones, uncovering distinct communities captured by different primer sets. The newly designed dinoflagellate and cyanobacterial primers revealed unique sets of amplicon sequence variants (ASVs) compared to published primers, highlighting the impact of primer choice on describing community composition. We also explored the effect of amplicon length on metabarcoding success over a sample age. Observed trends suggest that amplification success decreases with longer amplicons, probably as a result of DNA degradation in older sediment samples. Lastly, strong DNA preservation challenges emerged in sediment samples older than 7000 BP, corresponding with oxic phases of the Baltic Sea bottom water. This emphasizes the importance of age, sediment type, and preservation conditions when interpreting sedaDNA results. Despite limitations in temporal resolution, the study shows that sedaDNA‐based fluctuations in the phytoplankton community are consistent with well‐known environmental stages. More research is necessary to understand (1) DNA preservation and its impact on reconstructed communities and (2) impact of abiotic conditions on phytoplankton communities.

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Predicting the future of coastal marine ecosystems in the rapidly changing Arctic: The potential of palaeoenvironmental records

Cited by 13 publications

References 193 publications

Marine ecosystem shifts with deglacial sea-ice loss inferred from ancient DNA shotgun sequencing

Marine ecosystem shifts with deglacial sea-ice loss inferred from ancient DNA shotgun sequencing

Short-term responses of temperate and subarctic marine diatoms to Irgarol 1051 and UV radiation: Insights into temperature interactions

Glimpse of past dynamics: A new set of phytoplankton primers for sedaDNA

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