Stochastic processes shape microeukaryotic community assembly in a subtropical river across wet and dry seasons

Microbiome, Journal Year: 2019, Volume and Issue: 7(1)

Published: Oct. 22, 2019

Abstract Background The deep mechanisms (deterministic and/or stochastic processes) underlying community assembly are a central challenge in microbial ecology. However, the relative importance of these processes shaping riverine microeukaryotic biogeography is still poorly understood. Here, we compared spatiotemporal and biogeographical patterns using high-throughput sequencing 18S rRNA gene multivariate statistical analyses from subtropical river during wet dry seasons. Results Our results provide first description communities Tingjiang River, largest west Fujian province, southeastern China. showed that microeukaryotes both seasons exhibited contrasting compositions, which might be owing to planktonic having seasonal succession patterns. Further, all components (including total, dominant, always rare, conditionally rare taxa) significant distance-decay pattern seasons, had stronger relationship season, especially for taxa. Although several variables influence on communities, environmental spatial factors minor roles communities. Importantly, were strongly driven by processes, with 89.9%, 88.5%, 89.6% variation explained neutral model wet, dry, respectively. also large fraction across different taxonomic groups levels. Additionally, taxa, above below prediction, ecologically taxonomically distinct groups, interactively structured deterministic processes. Conclusions This study demonstrated sufficient substantial metacommunity hydrographic regimes, thereby providing better understanding patterns, waters.

Language: Английский

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Ecology under lake ice

Ecology Letters, Journal Year: 2016, Volume and Issue: 20(1), P. 98 - 111

Published: Nov. 27, 2016

Abstract Winter conditions are rapidly changing in temperate ecosystems, particularly for those that experience periods of snow and ice cover. Relatively little is known winter ecology these systems, due to a historical research focus on summer ‘growing seasons’. We executed the first global quantitative synthesis under‐ice lake ecology, including 36 abiotic biotic variables from 42 groups 101 lakes, examining seasonal differences connections as well how vary with geophysical factors. Plankton were more abundant under than expected; mean values 43.2% chlorophyll , 15.8% phytoplankton biovolume 25.3% zooplankton density. Dissolved nitrogen concentrations typically higher during winter, exaggerated smaller lakes. Lake size also influenced winter‐summer patterns dissolved organic carbon ( DOC ), At coarse levels taxonomic aggregation, community composition showed few systematic between seasons, although literature suggests frequently lake‐specific, species‐specific, or occur at level functional group. Within subset lakes had longer time series, subsequent some nutrient biomass.

Language: Английский

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Communities and Ecosystems

Springer eBooks, Journal Year: 2023, Volume and Issue: unknown, P. 281 - 333

Published: Jan. 1, 2023

Language: Английский

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The Biology of Lakes and Ponds

Oxford University Press eBooks, Journal Year: 2017, Volume and Issue: unknown

Published: Oct. 19, 2017

Abstract The Biology of Lakes and Ponds focuses on the interactions between abiotic frame, such as turbulence, temperature, pH nutrients, organisms, including with among organisms at individual, population community level. book fills this niche traditional limnology evolutionary ecology by focusing physiological, morphological behavioural adaptations to biotic factors how processes constraints determine structure dynamics lake pond systems. In addition, describes analyses causes consequences human activities freshwater ecosystems covers longstanding environmental threats, eutrophication acidification, well novel biodiversity loss, use everyday chemicals global climate change. However, also signs improvement possibilities restore degraded are discussed provide hope for future generations.

Language: Английский

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Fungi in aquatic ecosystems

Nature Reviews Microbiology, Journal Year: 2019, Volume and Issue: 17(6), P. 339 - 354

Published: March 12, 2019

Language: Английский

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CO2 Removal With Enhanced Weathering and Ocean Alkalinity Enhancement: Potential Risks and Co-benefits for Marine Pelagic Ecosystems

Frontiers in Climate, Journal Year: 2019, Volume and Issue: 1

Published: Oct. 11, 2019

Humankind will need to remove hundreds of gigatons carbon dioxide (CO2) from the atmosphere by end 21st century keep global warming below 2° C within constraints budget. However, so far it is unclear if and how this could be achieved. A widely recognized idea accelerate weathering reactions minerals that consume CO2 when they dissolve. Acceleration realized pulverizing distributing these onto land (termed "enhanced (EW)") or sea "ocean alkalinity enhancement (OAE)") thereby largely increasing their reactive surfaces. desired consumption atmospheric during dissolution would inevitably accompanied a release mineral products (alkalinity, Si, Ca, Mg, Fe, Ni maybe others). Here, we approximate maximum additions assess potential consequences for pelagic communities (mainly primary producers) biogeochemical fluxes control. Based on assessment, tentatively qualify induce positive and/or negative side effects high Ni, intermediate alkalinity, low Ca Mg. perturbation potentials are always higher at hotspots different EW than OAE. Furthermore, ecological/biogeochemical EW/OAE depend used. We hypothesise mainly calcifiers profit in scheme where CaCO3 derivatives used due beneficial changes carbonate chemistry. Figuratively, may turn blue ocean into white(r) ocean. When using silicates, additional Fe benefit silicifiers N2-fixers (cyanobacteria) increase productivity ultimately turning green(er) These considerations call dedicated research risks co-benefits marine other environments. Indeed, both OAE become important tools realize removal planetary scale but associated should revealed before deciding implementation.

Language: Английский

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Plankton dynamics under different climatic conditions in space and time

Freshwater Biology, Journal Year: 2012, Volume and Issue: 58(3), P. 463 - 482

Published: Nov. 23, 2012

Summary 1. Different components of the climate system have been shown to affect temporal dynamics in natural plankton communities on scales varying from days years. The seasonal temperate lake communities, with emphasis both physical and biological forcing factors, were captured 1980s a conceptual framework, Plankton Ecology Group (PEG) model. 2. Taking PEG model as our starting point, we discuss anticipated changes long‐term extend this other regions, particularly polar tropical latitudes. Based improved post‐PEG understanding dynamics, also evaluate role microbial plankton, parasites fish governing distribution. 3. In lakes, there is usually just single peak biomass summer. Lengthening growing season under warmer conditions may lead higher more prolonged phytoplankton productivity. Climate‐induced increases nutrient loading these oligotrophic waters contribute subsequent zooplankton 4. pattern two peaks – spring summer can shift one but longer larger increases, associated populations zooplanktivorous fish. Climate change will exacerbate trends by increasing through increased internal inputs (due warming) catchment (in case precipitation). 5. systems, variability precipitation be an important driver development plankton. Increases intensity reset favour species adapted highly variable environments. existing intense predation zooplankters increase further, resulting perennially low biomass. 6. Bacteria not included original Seasonally, bacteria vary less than often follow its patterns, colder lakes. future warming, greater influx allochthonous carbon obscure pattern. 7. Our analyses indicate that consequences for are, large extent, specific, depending characteristics such food‐web structure loading. Indirect effects direct temperature increase, especially phytoplankton. However, warming general picture emerges bacterivory, cyanobacterial dominance smaller‐bodied are heavily impacted predation.

Language: Английский

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The interaction between cyanobacteria and zooplankton in a more eutrophic world

Harmful Algae, Journal Year: 2016, Volume and Issue: 54, P. 128 - 144

Published: April 1, 2016

Language: Английский

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Cyanobacteria as biological drivers of lake nitrogen and phosphorus cycling

Ecosphere, Journal Year: 2015, Volume and Issue: 6(1), P. 1 - 19

Published: Jan. 1, 2015

Here we draw attention to the potential for pelagic bloom‐forming cyanobacteria have substantial effects on nutrient cycling and ecosystem resilience across a wide range of lakes. Specifically, hypothesize that cyanobacterial blooms can influence lake cycling, resilience, regime shifts by tapping into pools nitrogen (N) phosphorus (P) not usually accessible phytoplankton. The ability many taxa fix dissolved N 2 gas is well‐known source N, but some also access P in sediments bottom waters. Both these nutrients be released water column via leakage or mortality, thereby increasing availability other phytoplankton microbes. Moreover, are restricted high (eutrophic) lakes: occur lakes with low concentrations, suggesting changes mediated could affect gradient concentrations. We used simple model coupled cycles explore dynamics resilience. Consistent our hypothesis, parameters reflecting modification alter number, location, and/or stability equilibria. In particular, demonstrates low‐nutrient conditions facilitate shift high‐nutrient state reducing state. This suggests warrant as drivers transition from low‐nutrient, clear‐water high‐nutrient, turbid‐water regime, prediction particular concern given such reported regions world due part global climate change.

Language: Английский

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Ecological assessments with algae: a review and synthesis

Journal of Phycology, Journal Year: 2014, Volume and Issue: 50(3), P. 437 - 461

Published: April 4, 2014

Algae have been used for a century in environmental assessments of water bodies and are now countries around the world. This review synthesizes recent advances field framework assessment management that can guide design assessments, applications phycology refinements those to better support decisions. critical parts aquatic ecosystems power food webs biogeochemical cycling. also major sources problems threaten many goods services when abundances nuisance toxic taxa high. Thus, algae be indicate ecosystem services, which complements how algal indicators assess levels contaminants habitat alterations (stressors). Understanding managers' use ecology, taxonomy, physiology our research improve its application. Environmental involve characterizing ecological condition diagnosing causes threats services. Recent include site‐specific models account natural variability among habitats estimate effects humans. Relationships between assemblages stressors caused by humans help diagnose establish targets protection restoration. Many responses thresholds particularly important developing stakeholder consensus stressor targets. Future on regional‐scale resilience assemblages, they provide, methods monitoring forecasting change will resource management.

Language: Английский

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