Environmental DNA detects biodiversity and ecological features of phytoplankton communities in Mediterranean transitional waters

Scientific Reports, Journal Year: 2023, Volume and Issue: 13(1)

Published: Sept. 14, 2023

Abstract Climate changes and anthropogenic pressures are causing a biodiversity decline in terms of species number genetic diversity, reducing the adaptability evolvability natural communities. Transitional water ecosystems more sensitive to habitat reduction degradation and, thus, exposed declines requiring monitoring programs for their conservation. Environmental DNA (eDNA) metabarcoding represents high-throughput tool assessment that is facilitating data collection monitoring. In this study, we applied, first time, eDNA Mediterranean coastal lagoon assess ecological features eukaryotic phytoplankton We sampled seven different sites amplified extracted with primers targeting variable region 4 (V4) 18S rRNA gene marker. The results demonstrated validity studies provide insights into composition, establish structure spatial variation communities, evaluate its correlation abiotic factors. Finally, distances analysis suggests distribution OTUs, at least Tetraselmis genus, reflects background.

Language: Английский

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Modelling the bottom-up effects of climate change on primary production in the Gulf of St. Lawrence and eastern Scotian Shelf

Frontiers in Marine Science, Journal Year: 2024, Volume and Issue: 11

Published: Aug. 15, 2024

The Gulf of St. Lawrence (GSL), along with the Estuary, is largest estuarine system in North America. It a biologically productive sea and an important fishing ground Canada. objectives this study are to determine how climate changes will affect primary production GSL on eastern Scotian Shelf, drivers changes. We use regional ocean model forced downscaled output Max-Planck Institute Earth System Model net under change scenario Representative Concentration Pathway 8.5 (RCP8.5). Results reveal projected 13.4% decrease annual across over next 70 years. This decline primarily stems from reduced nutrient concentrations upper layer, despite increase nutrients supplied by rivers. Enhanced freshwater influx surface warming contribute heightened stratification, that turn reduce vertical fluxes deeper layers. mechanism affects upwelling nutrient-rich water at head Laurentian Channel Lower leading 22% reduction nitrate flux future. Additionally, masses entering Strait Belle Isle Cabot also reduced. Due declining sea-ice concentration, phytoplankton bloom expected occur between 9 23 days earlier warmer climate, last for up 24 longer, depending subregions, compared historical period (2001-2020). Biological productivity higher trophic levels, thus fisheries productivity, could be negatively impacted RCP8.5 scenario.

Language: Английский

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Phytoplankton Structural and Functional Organization in a Large Lowland Reservoir under the Global Climate Change (Case Study of the Kaniv Reservoir)

Hydrobiological Journal, Journal Year: 2022, Volume and Issue: 58(6), P. 3 - 27

Published: Jan. 1, 2022

The paper deals with the phytoplankton long-term dynamics in a large lowland reservoir under global climate change (case-study of Kaniv Reservoir, Ukraine). field studies were carried out summer seasons two years (2017 and 2019), different temperature deviation from climatic norm. results have been compared retrospective data last century. response to warming comprises: raise total cell count; increase Cyanobacteria biomass their portion community's biomass; dropdown Bacillariophyta changes dominant complex structure; small-sized species portion. percent appeared be most representative indicator change, which is line obtained by other researchers on water reservoirs across globe temperate tropical zone.

Language: Английский

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Organization of planktonic Tintinnina assemblages in the Atlantic Ocean

Frontiers in Marine Science, Journal Year: 2023, Volume and Issue: 10

Published: Feb. 23, 2023

Marine plankton have different biogeographical distribution patterns. However, it is not clear how the entire assemblage composed of these species with distinct Tintinnina (tintinnids) single-celled planktonic protozoa commonly used as model organisms in studies. In this research, we investigated organization assemblages along Atlantic Meridional Transect (AMT) spanning over 90 degrees latitude during 29 th AMT cruise (2019). high frequency occurrence was classified into four biogeographic patterns (equatorial, gyre, frontal, and deep Chl a maximum) according to their vertical horizontal distribution. All falling within each pattern formed sub-assemblage. Equatorial sub-assemblage dominated upper waters equatorial zone gyre centres. frontal sub-assemblages co-dominated zones. Deep Chlorophyll maximum Layer (DCM) DCM waters. Some abundance could be indicator sub-assemblages. The northern southern hemispheres exhibited asymmetry terms composition. latitudinal gradient richness bimodal, which shaped by superposition number latitude. result study contributes understanding subtropical gyres Pacific Indian Ocean. It also valuable for predicting influence global warming on changes richness.

Language: Английский

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Phytoplankton competition and resilience under fluctuating temperature

Ecology and Evolution, Journal Year: 2023, Volume and Issue: 13(3)

Published: March 1, 2023

Abstract Environmental variability is an inherent feature of natural systems which complicates predictions species interactions. Primarily, the complexity in predicting response organisms to environmental fluctuations part because species' responses abiotic factors are non‐linear, even stable conditions. Temperature exerts a major control over phytoplankton growth and physiology, yet influence thermal on competition dynamics largely unknown. To investigate limits coexistence variable environments, mixed cultures with constant abundance ratios marine diatoms, Phaeodactylum tricornutum Thalassiosira pseudonana, were exposed different temperature fluctuation regimes ( n = 17) under high low nitrogen (N) Here we demonstrate that exhibit substantial resilience variability. The time required observe shift ratio decreased increasing fluctuations, but two model N conditions was disrupted only when amplitudes (±8.2°C). limitation caused amplitude for disruption become lower (±5.9°C). Furthermore, once reinstated, differed their ability recover from fluctuations. Our findings suggest despite expectation unequal effect competitors, cycles may reduce rate replacement remain below certain threshold. Beyond these thresholds, competitive exclusion could, however, be accelerated, suggesting aquatic heatwaves availability status likely lead abrupt unpredictable restructuring community composition.

Language: Английский

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Impact of climate change and oligotrophication on quality and quantity of lake primary production: A case study in Lake Biwa

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 927, P. 172266 - 172266

Published: April 5, 2024

Language: Английский

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Interactions between ocean acidification and multiple environmental drivers on the biochemical traits of marine primary producers: A meta-analysis

Marine Environmental Research, Journal Year: 2024, Volume and Issue: 201, P. 106707 - 106707

Published: Aug. 27, 2024

Language: Английский

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Jigsaw puzzle of the interwoven biologically-driven ocean carbon pumps

Progress In Oceanography, Journal Year: 2024, Volume and Issue: unknown, P. 103338 - 103338

Published: Sept. 1, 2024

Language: Английский

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Effects of mixotroph evolution on trophic transfer

Journal of Plankton Research, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 28, 2024

Abstract Plankton form the foundation of marine food webs, playing fundamental roles in mediating trophic transfer and movement organic matter. Increasing ocean temperatures have been documented to drive evolution plankton, resulting changes metabolic traits that can affect transfer. Despite this, there are few direct tests effects such on predator–prey interactions. Here, we used two thermally adapted strains mixotroph (organism combines both heterotrophy autotrophy obtain energy) Ochromonas as prey generalist dinoflagellate predator Oxyrrhis marina quantify how evolved mixotrophs hot cold affects Evolution reduced overall ingestion rates strains, consequently weakening We found variability palatability performance with thermal adaptation between strains. Further, quantified ambient temperature grazing same conditions. led increased but declines clearance rates. Our results for individual, pairwise interactions show climate change alter dynamics planktonic webs implications carbon cycling upper ecosystems.

Language: Английский

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Transcriptomic analysis reveals distinct mechanisms of adaptation of a polar picophytoplankter under ocean acidification conditions

Marine Environmental Research, Journal Year: 2022, Volume and Issue: 182, P. 105782 - 105782

Published: Oct. 19, 2022

Language: Английский

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