Climate change amplifies the risk of potentially toxigenic cyanobacteria

Global Change Biology, Journal Year: 2023, Volume and Issue: 29(18), P. 5240 - 5249

Published: July 6, 2023

Abstract Cyanobacterial blooms pose a significant threat to water security, with anthropogenic forcing being implicated as key driver behind the recent upsurge and global expansion of cyanobacteria in modern times. The potential effects land‐use alterations climate change can lead complicated, less‐predictable scenarios cyanobacterial management, especially when forecasting toxin risks. There is growing need for further investigations into specific stressors that stimulate toxins, well resolving uncertainty surrounding historical or contemporary nature cyanobacterial‐associated To address this gap, we employed paleolimnological approach reconstruct abundance microcystin‐producing temperate lakes situated along human impact gradient. We identified breakpoints (i.e., points abrupt change) these time series examined landscape climatic properties on their occurrence. Our findings indicate subject greater influence exhibited an earlier onset biomass by 40 years compared less‐impacted lakes, emerging dominant predictor. Moreover, increased both high‐ low‐impact around 1980s, warming primary driver. chronicle importance increasing risk toxigenic freshwater resources.

Language: Английский

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Environmental filtering governs consistent vertical zonation in sedimentary microbial communities across disconnected mountain lakes

Environmental Microbiology, Journal Year: 2024, Volume and Issue: 26(3)

Published: March 1, 2024

Abstract Subsurface microorganisms make up the majority of Earth's microbial biomass, but ecological processes governing surface communities may not explain community patterns at depth because burial. Depth constrains dispersal and energy availability, when combined with geographic isolation across landscapes, influence assembly. We sequenced 16S rRNA gene bacteria archaea from 48 sediment cores 36 lakes in four disconnected mountain ranges Wyoming, USA used null models to infer assembly depth, spatial isolation, varying environments. Although we expected strong limitations these isolated settings, composition was primarily shaped by environmental selection. Communities consistently shifted domination organisms that degrade organic matter methanogenic, low‐energy adapted taxa deeper zones. Stochastic processes—like limitation—contributed differences among lakes, effects weakened selection ultimately governed subsurface biogeography.

Language: Английский

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Detection of fish sedimentary DNA in aquatic systems: A review of methodological challenges and future opportunities

Environmental DNA, Journal Year: 2023, Volume and Issue: 5(6), P. 1449 - 1472

Published: Aug. 28, 2023

Abstract Environmental DNA studies have proliferated over the last decade, with promising data describing diversity of organisms inhabiting aquatic and terrestrial ecosystems. The recovery present in sediment systems (sedDNA) has provided short‐ long‐term on a wide range biological groups (e.g., photosynthetic organisms, zooplankton species) advanced our understanding how environmental changes affected communities. However, substantial challenges remain for recovering genetic material macro‐organisms fish) from sediments, preventing complete reconstructions past ecosystems, limiting historic, higher trophic level interactions. In this review, we outline biotic abiotic factors affecting production, persistence, transport fish water column to address questions regarding preservation sediment. We identify sources uncertainties around sedDNA arising during workflow. This includes methodological issues related experimental design, extraction procedures, selected molecular method (quantitative PCR, digital metabarcoding, metagenomics). By evaluating previous efforts (published unpublished works) recover signals, provide suggestions future research propose troubleshooting workflows effective detection quantification sedDNA. With further research, use potential be powerful tool inferring presence time reconstructing their population community dynamics.

Language: Английский

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Organic matter content and source is associated with the depth‐dependent distribution of prokaryotes in lake sediments

Freshwater Biology, Journal Year: 2024, Volume and Issue: 69(4), P. 496 - 508

Published: Feb. 8, 2024

Abstract Aquatic sediments harbour a diverse array of microorganisms that drive organic matter recycling, carbon sequestration and greenhouse gases (e.g., CO 2 , CH 4 N O) emissions. Although largely studied in water columns, vertical profiles the diversity composition prokaryotic communities (i.e., Bacteria Archaea) aquatic are still rare. More specifically, much remains to be learnt about their distribution lake how environmental conditions at time burial have impacted composition. We investigated community with 16S rRNA gene quantitative (q)PCR metabarcoding approaches applied 93 sediment layers collected 2‐m‐long core from eutrophic alkaline Lake Chenghai subtropical China. aimed study diversity, structure as well factors influencing it. Bacterial abundance was found decrease depth although richness both bacterial archaeal assemblages slightly increased depth. In terms composition, strongly stratified sediment–depth pattern observed which Proteobacteria, Desulfobacterota, Bacteroidota Verrucomicrobiota dominated inventories surface layers, whereas Chloroflexi, Spirochaetota, Planctomycetota, Crenarchaeota were more abundant deep layers. Organic contents sources identified major shaping community. Overall, our provides new evidence sediment's linked external energy. This complement existing data other systems towards better understanding community's contribution biogeochemical cycle lakes.

Language: Английский

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Exploring the historical presence of kākahi (freshwater mussel) in lakes using sedimentary ancient DNA

Inland Waters, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 42

Published: March 13, 2025

Language: Английский

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Palaeogenomic inference of biodiversity dynamics across Quaternary timescales

Published: March 18, 2025

Language: Английский

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Detection of fish and mussel DNA in lake sediment cores depends on location, species, and molecular method

Environmental DNA, Journal Year: 2023, Volume and Issue: 5(6), P. 1484 - 1504

Published: Sept. 7, 2023

Abstract Environmental DNA provides an opportunity to track long‐term changes in biological communities lake ecosystems but the detection of macroorganisms, such as freshwater fish and mussels, sedimentary (sedDNA) has only been successfully reported a few studies date. Factors low abundance target organisms, sampling location, molecular approach used, quantity may influence detection, though exploring these factors are lacking. In present study, sediment cores were collected from depocenter nearshore site small shallow where some historical survey data was available. extracted core analyzed for Anguilla australis (shortfin eel), Echyridella menziesii (freshwater mussel), Perca fluviatilis (European perch) using droplet digital PCR (ddPCR) general (class Actinopterygii) macroinvertebrates metabarcoding. The surveys (last 20 years) aligned with except lack dieffenbachii (longfin eel) detection. Generalized additive mixed model analysis showed significantly higher detections samples compared core, which is most likely related habitat species. Differential species caused by their ecology locality. ddPCR assays more sensitive (88 ± 3% positive detections) than metabarcoding (48 10%). However, enabled additional Target negatively impacted reduction total concentration older sediments. This research highlights that current techniques used mussel sedDNA can result inconsistent temporal spatial species, especially We recommend methodology interpretation results need be considered context ecology, abundance, concentrations.

Language: Английский

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Using DNA archived in lake sediments to reconstruct past ecosystems

Elsevier eBooks, Journal Year: 2024, Volume and Issue: unknown, P. 673 - 690

Published: Feb. 24, 2024

Language: Английский

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Sedimentary DNA reveals phytoplankton diversity loss in a deep maar lake during the Anthropocene

Limnology and Oceanography, Journal Year: 2024, Volume and Issue: 69(6), P. 1299 - 1315

Published: April 6, 2024

Abstract Anthropogenic‐driven environmental change, including current climate warming, has influenced lake ecosystems globally during the Anthropocene. Phytoplankton are important indicators of changes in lakes and play a fundamental role maintaining functioning stability these ecosystems. However, extent to which phytoplankton were affected by anthropogenic or climatic forces Anthropocene remains unclear. Here, we investigated 160‐yr‐long dynamics community (cyanobacteria eukaryotic microalgae) response forcing Sihailongwan Maar Lake—a candidate for Global boundary Stratotype Section Point demarcation Anthropocene—using DNA metabarcoding traditional paleolimnological approaches. Our results show significant decline diversity an abrupt shift composition around 1950s, corresponding beginning “Great Acceleration” period. Specifically, taxa coexistence patterns, niche differentiation, assembly mechanisms changed significantly after 1950s. Overall, increases air temperature appear be dominant controls reorganization from this deep maar lake. A neutral model suggests that was mainly controlled stochastic processes before 1950s; however, as time progressed, deterministic effects driven global warming increased. The study imply perturbations have led loss further ecological resilience lakes, with likely knock‐on on productivity function

Language: Английский

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Evaluating the use of lake sedimentary DNA in palaeolimnology: A comparison with long‐term microscopy‐based monitoring of the phytoplankton community

Molecular Ecology Resources, Journal Year: 2023, Volume and Issue: 24(2)

Published: Nov. 23, 2023

Abstract Palaeolimnological records provide valuable information about how phytoplankton respond to long‐term drivers of environmental change. Traditional palaeolimnological tools such as microfossils and pigments are restricted taxa that leave sub‐fossil remains, a method can be applied the wider community is required. Sedimentary DNA (sedDNA), extracted from lake sediment cores, shows promise in palaeolimnology, but validation against data monitoring water necessary enable its development reliable record past communities. To address this need, 18S rRNA gene amplicon sequencing was carried out on sediments core collected Esthwaite Water (English Lake District) spanning ~105 years. This sedDNA compared with concurrent microscopy‐based surface water. Broadly comparable trends were observed between datasets, respect diversity relative abundance occurrence chlorophytes, dinoflagellates, ochrophytes bacillariophytes. Up 20% genera successfully captured using both methods, revealed previously undetected phytoplankton. These results suggest used an effective communities, at least over timescales <100 However, substantial proportion identified by microscopy not detected sedDNA, highlighting current limitations technique require further reference database coverage. The taphonomic processes which may affect reliability, extent rate deposition degradation, also research.

Language: Английский

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