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| Open AccessConsistent stoichiometric long-term relationships between nutrients and chlorophyll-a across shallow lakes
Nutrient limitation is a well-known control of phytoplankton growth, but predicting specific responses in individual lakes based on nutrient data alone has proven challenging. Here, the authors show that long-term signals of chlorophyll-a dynamics in shallow lakes can be captured based on stoichiometric effects of N and P concentrations along a continuum of total N:total P ratios.
- Daniel Graeber
- , Mark J. McCarthy
- & Thomas A. Davidson
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Article
| Open AccessThermal responses of dissolved organic matter under global change
The response of organic molecules to climate change is linked to warming, nutrient loading, and greenhouse gas emissions, according to an indicator developed to quantify the aggregated thermal response of individual organic molecules.
- Ang Hu
- , Kyoung-Soon Jang
- & Jianjun Wang
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Article
| Open AccessEarly warning signals have limited applicability to empirical lake data
Abrupt regime shifts could in theory be predicted from early warning signals. Here, the authors show that true critical transitions are challenging to classify in lake planktonic systems, due to mismatches between trophic levels, and reveal uneven performance of early warning signal detection methods.
- Duncan A. O’Brien
- , Smita Deb
- & Christopher F. Clements
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Article
| Open AccessGenetic erosion reduces biomass temporal stability in wild fish populations
Experimental evidence indicates that genetic diversity can promote biomass stability, but does this process occur in wild populations? Focusing on three freshwater fish species from two river basins in southwestern France, this study shows that the biomass of genetically diversified populations has been more stable in recent decades than populations that have suffered from genetic erosion.
- Jérôme G. Prunier
- , Mathieu Chevalier
- & Simon Blanchet
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Article
| Open AccessSpecies invasiveness and community invasibility of North American freshwater fish fauna revealed via trait-based analysis
Predicting non-native species’ invasiveness and vulnerability of communities to invasions is challenging. Here, the authors show that establishment of non-native freshwater fish species in the US depends on the functional characteristics of both non-native and resident species.
- Guohuan Su
- , Adam Mertel
- & Justin M. Calabrese
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Article
| Open AccessThe color of environmental noise in river networks
The color of environmental noise, or degree of predictability in environmental variation, has important implications for ecosystem conservation and management. This study investigates the patterns and drivers of noise color across the US rivers.
- Tongbi Tu
- , Lise Comte
- & Albert Ruhi
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Article
| Open AccessMetabolic plasticity can amplify ecosystem responses to global warming
Organisms can alter their physiological response to warming. Here, the authors show that the ability to raise metabolic rate following exposure to warming is inverse to body size and provide a mathematical model which estimates that metabolic plasticity could amplify energy flux through ecosystems in response to warming.
- Rebecca L. Kordas
- , Samraat Pawar
- & Eoin J. O’Gorman
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Article
| Open AccessGenomic and metabolic adaptations of biofilms to ecological windows of opportunity in glacier-fed streams
In glacier-fed streams, ecological windows of opportunity allow complex microbial biofilms to develop and transiently form the basis of the food web. Using metagenomics, this study reveals the metabolic strategies and key genomic underpinnings of adaptive traits that enable these biofilms to exploit environmental opportunities.
- Susheel Bhanu Busi
- , Massimo Bourquin
- & Tom J. Battin
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Article
| Open AccessUnexpectedly minor nitrous oxide emissions from fluvial networks draining permafrost catchments of the East Qinghai-Tibet Plateau
Permafrost soils can be substantial sources of nitrous oxide (N2O) to the atmosphere, but no data exist on the N2O footprints of permafrost rivers. Here, the authors show that alpine permafrost rivers are unexpectedly small sources of atmospheric N2O at present.
- Liwei Zhang
- , Sibo Zhang
- & Emily H. Stanley
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Article
| Open AccessThe role of methanotrophy in the microbial carbon metabolism of temperate lakes
Methane metabolism is considered of secondary importance in most lake food webs. Here the authors quantify the contribution of methanotrophs to C cycling in six lakes, finding evidence of a large role of methanotrophs due to their higher specific activity and larger cell size.
- Paula C. J. Reis
- , Shoji D. Thottathil
- & Yves T. Prairie
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Article
| Open AccessGlacier retreat creating new Pacific salmon habitat in western North America
Potential gains in future salmon habitat associated with glacier loss have yet to be quantified. This study projects future gains in Pacific salmon freshwater habitat within western North America by linking a model of glacier mass change for 315 glaciers, forced by five different Global Climate Models, with a simple model of salmon stream habitat potential.
- Kara J. Pitman
- , Jonathan W. Moore
- & Daniel E. Schindler
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Article
| Open AccessForest defoliator outbreaks alter nutrient cycling in northern waters
Defoliating insects disrupt nutrient cycling of boreal catchments by redistributing carbon and nitrogen from forests to lakes. The resulting shift in lake biogeochemistry exceeds broader between-year trends observed across the boreal and north temperate region.
- Samuel G. Woodman
- , Sacha Khoury
- & Andrew J. Tanentzap
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Article
| Open AccessLethal microbial blooms delayed freshwater ecosystem recovery following the end-Permian extinction
Harmful algal and bacterial blooms are increasingly frequent in lakes and rivers. From the Sydney Basin, Australia, this study uses fossil, sedimentary and geochemical data to reveal bloom events following forest ecosystem collapse during the end-Permian event and that blooms have consistently followed warming-related extinction events, inhibiting the recovery of freshwater ecosystems for millennia.
- Chris Mays
- , Stephen McLoughlin
- & Vivi Vajda
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Article
| Open AccessImpacts of detritivore diversity loss on instream decomposition are greatest in the tropics
It is unclear whether stream detritivore diversity enhances decomposition across climates. Here the authors manipulate litter diversity and examine detritivore assemblages in a globally distributed stream litterbag experiment, finding a positive diversity-decomposition relationship stronger in tropical streams, where detritivore diversity is lower.
- Luz Boyero
- , Naiara López-Rojo
- & Catherine M. Yule
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Article
| Open AccessA heterocyte glycolipid-based calibration to reconstruct past continental climate change
Understanding the past is necessary to comprehend Earth’s response to present climate change, but past climate reconstruction is hampered by a lack of temperature proxies. Here the authors develop the HDI26, a proxy using cyanobacterial glycolipids to reconstruct water temperatures of lakes worldwide.
- Thorsten Bauersachs
- , James M. Russell
- & Lorenz Schwark
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Article
| Open AccessReversed evolution of grazer resistance to cyanobacteria
Anthropogenic changes, such as eutrophication from lake pollution, can lead to rapid evolution. Comparing Daphnia resurrected from generations adapted to historical pollution to contemporary, post-cleanup populations finds that Daphnia rapidly reversed their evolved resistance to harmful cyanobacteria.
- Jana Isanta-Navarro
- , Nelson G. Hairston Jr
- & Dominik Martin-Creuzburg
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Article
| Open AccessThreats of global warming to the world’s freshwater fishes
Climate change is a threat to global biodiversity, but the potential effects on freshwater fishes have not been well studied. Here the authors model future flow and water temperature extremes and predict that increases in water temperature in particular will pose serious threats to freshwater fishes
- Valerio Barbarossa
- , Joyce Bosmans
- & Aafke M. Schipper
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Article
| Open AccessConsistent effects of pesticides on community structure and ecosystem function in freshwater systems
The effects of pesticides on individual species could propagate into additional community-wide and ecosystem-level effects. Here the authors use a mesocosm experiment to test how a diverse array of herbicides and insecticides disrupt aquatic community structure and ecosystem function.
- Samantha L. Rumschlag
- , Michael B. Mahon
- & Jason R. Rohr
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Article
| Open AccessGlobal patterns of the leaf economics spectrum in wetlands
Leaf economics spectrum theory has greatly advanced understanding of plant functional ecology, but it is unclear whether its predictions hold in wetland communities. Here, Pan and colleagues analyse leaf economics traits in wetland plants, showing that their trait relationships deviate from fully terrestrial plants, particularly by clustering towards acquisitive plant strategies.
- Yingji Pan
- , Ellen Cieraad
- & Peter M. van Bodegom
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| Open AccessAssessing the response of micro-eukaryotic diversity to the Great Acceleration using lake sedimentary DNA
Sedimentary DNA can be used to infer how organisms responded to changing environmental conditions over millennia. Here, the authors use sedimentary DNA of micro-eukaryotes in low-elevation (human-impacted) and high-elevation (more pristine) lakes to show how human influences have altered lake community composition in the Anthropocene.
- François Keck
- , Laurent Millet
- & Isabelle Domaizon
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Article
| Open AccessEnvironmental DNA allows upscaling spatial patterns of biodiversity in freshwater ecosystems
Biomonitoring via environmental DNA (eDNA) is an important conservation tool for freshwater ecosystems, but this is complicated by eDNA movement downstream. Here, Carraro et al. develop and test an approach to reconstruct high-resolution spatial biodiversity patterns from freshwater eDNA.
- Luca Carraro
- , Elvira Mächler
- & Florian Altermatt
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Article
| Open AccessGainers and losers of surface and terrestrial water resources in China during 1989–2016
The authors of this study compile data on spatial and temporal dynamics of surface water bodies across China, covering a time span from 1989 – 2016. The study describes hot-spot areas with strongly decreasing trends in surface water area and terrestrial water storage in North China and discusses implications of water resources and security in China.
- Xinxin Wang
- , Xiangming Xiao
- & Bo Li
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Article
| Open AccessExtreme rainfall events alter the trophic structure in bromeliad tanks across the Neotropics
The amount and frequency of rainfall structures aquatic food webs. Here the authors show that in tropical tank bromeliads, lower trophic levels are more abundant in stable rainfall conditions, while biomass pyramids are inverted in conditions with periodic droughts.
- Gustavo Q. Romero
- , Nicholas A. C. Marino
- & Diane S. Srivastava
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Article
| Open AccessEffects of climate and land-use changes on fish catches across lakes at a global scale
Lake fisheries are vulnerable to environmental changes. Here, Kao et al. develop a Bayesian networks model to analyze time-series data from 31 major fisheries lake across five continents, showing that fish catches can respond either positively or negatively to climate and land-use changes.
- Yu-Chun Kao
- , Mark W. Rogers
- & Joelle D. Young
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Article
| Open AccessGlobal determinants of freshwater and marine fish genetic diversity
Biogeographic patterns of genetic diversity are poorly documented, especially for fish species. Here the authors show that (mitochondrial) genetic diversity has global spatial organization patterns with different environmental drivers for marine and freshwater fishes, where genetic diversity is only partly congruent with species richness.
- Stéphanie Manel
- , Pierre-Edouard Guerin
- & Loïc Pellissier
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Matters Arising
| Open AccessReply to ‘Pseudoreplication and greenhouse-gas emissions from rivers'
- Sophie A. Comer-Warner
- , Paul Romeijn
- & Stefan Krause
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Matters Arising
| Open AccessPseudoreplication and greenhouse-gas emissions from rivers
- Scott D. Tiegs
- & Thomas Raffel
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Article
| Open AccessDome patterns in pelagic size spectra reveal strong trophic cascades
An important question in ecology is how much species at higher trophic levels affect lower levels through top-down cascades. Here the authors show through analyses of pelagic size spectra that such cascades are strong in freshwater systems and can also arise in nutrient rich marine systems.
- Axel G. Rossberg
- , Ursula Gaedke
- & Pavel Kratina
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Article
| Open AccessWater quality improvements offset the climatic debt for stream macroinvertebrates over twenty years
Both climate change and environmental degradation pose harm to freshwaters. Here the authors find that macroinvertebrate communities in England and Wales maintained equilibrium with the environment from 1991 to 2011, and attribute this to water quality improvements offsetting rising temperatures.
- Ian P. Vaughan
- & Nicholas J. Gotelli
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Article
| Open AccessA diverse suite of pharmaceuticals contaminates stream and riparian food webs
Pharmaceuticals are widespread contaminants in surface waters. Here, Richmond and colleagues show that dozens of pharmaceuticals accumulate in food chains of streams, including in predators in adjacent terrestrial ecosystems.
- Erinn K. Richmond
- , Emma J. Rosi
- & Michael R. Grace
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Correspondence
| Open AccessPremature alarm on the impacts of climate change on Arctic Char in Lake Hazen
- Jean-Sébastien Moore
- , Jacqueline M. Chapman
- & Eric B. Taylor
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Article
| Open AccessDiscovery of a silicate rock-boring organism and macrobioerosion in fresh water
Macrobioerosion, the boring of rock and other hard substrates by living organisms, is used as a marker of marine paleo-environments. Here, Bolotov et al. describe a rock-boring mussel and its associated community from freshwater in Myanmar, demonstrating that macrobioerosion is a wider phenomenon.
- Ivan N. Bolotov
- , Olga V. Aksenova
- & Oleg S. Pokrovsky
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Article
| Open AccessOrganic matter loading by hippopotami causes subsidy overload resulting in downstream hypoxia and fish kills
Hypoxic (low oxygen) water conditions are generally thought to be uncommon in rivers and result from human impacts. However, Dutton and colleagues show here that waste from hippos in the Mara River contributes to frequent hypoxic events, suggesting hypoxia is a natural aspect of this system.
- Christopher L. Dutton
- , Amanda L. Subalusky
- & David M. Post
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Article
| Open AccessContext-dependent interactions and the regulation of species richness in freshwater fish
Species richness patterns are driven by biotic and abiotic factors, the relative strengths of which are unclear. Here, the authors test how species interactions or environmental traits influence fish richness across over 700 Canadian lakes, showing a surprisingly small role of negative interactions.
- Andrew S. MacDougall
- , Eric Harvey
- & Kevin S. McCann
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Article
| Open AccessSimilarity of stream width distributions across headwater systems
The morphology and abundance of streams control the rates of hydraulic and biogeochemical exchange between streams, groundwater and the atmosphere. Here, the authors show that stream hydromorphology is predictable within headwater catchments with implications for stream-atmosphere gas exchange estimates.
- George H. Allen
- , Tamlin M. Pavelsky
- & Colin J. Gleason
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Article
| Open AccessDesigning flows to resolve human and environmental water needs in a dam-regulated river
Human and environmental water needs can come into conflict in dam-regulated river systems. Here, Chen and Olden investigate the potential for the use of fish–flow modeling to make recommendations for the management of native and nonnative fish species whilst providing water for society.
- William Chen
- & Julian D. Olden
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Article
| Open AccessCross continental increase in methane ebullition under climate change
The impacts of climate change on natural methane (CH4) emissions via ebullition are unclear. Here, using published and experimental multi-seasonal CH4 ebullition data, the authors find a strong relationship between CH4 ebullition and temperature across a wide range of freshwater ecosystems globally.
- Ralf C. H. Aben
- , Nathan Barros
- & Sarian Kosten
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Article
| Open AccessEcogenomics of virophages and their giant virus hosts assessed through time series metagenomics
Virophages are recently-identified small viruses that infect larger viruses, yet their diversity and ecological roles are poorly understood. Here, Roux and colleagues present time series metagenomics data revealing new virophage genera and their putative ecological interactions in two freshwater lakes.
- Simon Roux
- , Leong-Keat Chan
- & Matthew B. Sullivan
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Article
| Open AccessPhotochemical alteration of organic carbon draining permafrost soils shifts microbial metabolic pathways and stimulates respiration
The role of dissolved organic carbon (DOC) photo-alteration in the microbial respiration of DOC to CO2 is unclear. Here, the authors show that the impact of this mechanism depends on whether photo-alteration of DOC produces or removes molecules used by native microbial communities prior to light exposure.
- Collin P. Ward
- , Sarah G. Nalven
- & Rose M. Cory
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Article
| Open AccessRegulation of snow-fed rivers affects flow regimes more than climate change
Global warming and hydropower regulations are major threats to future fresh-water availability and biodiversity. Here, the authors show that their impact on flow regime over a large landmass result in similar changes, but hydropower is more critical locally and may have potential for climate adaptation in floodplains.
- B. Arheimer
- , C. Donnelly
- & G. Lindström
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Article
| Open AccessRiver plastic emissions to the world’s oceans
Rivers provide a major pathway for ocean plastic waste, but effective mitigation is dependent on a quantification of active sources. Here, the authors present a global model of riverine plastic inputs, and estimate annual plastic waste of almost 2.5 million tonnes, with 86% sourced from Asia.
- Laurent C. M. Lebreton
- , Joost van der Zwet
- & Julia Reisser
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Article
| Open AccessAncient and methane-derived carbon subsidizes contemporary food webs
Alluvial aquifers of river floodplains support abundant large-bodied consumers despite an absence of light and scarcity of organic carbon. DelVecchia et al. reveal that much of the biomass carbon in these freshwater consumers is ancient and derived from methane.
- Amanda G. DelVecchia
- , Jack A. Stanford
- & Xiaomei Xu
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Article
| Open AccessHypoxia causes transgenerational impairments in reproduction of fish
Hypoxia has diverse effects on aquatic life. Wang et al.show that reproductive defects resulting from hypoxia are epigenetically heritable in Japanese rice fish, and that this intergenerational inheritance is accompanied by differential methylation and gene expression in sperm.
- Simon Yuan Wang
- , Karen Lau
- & Rudolf Shiu-Sun Wu
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Article
| Open AccessEcological responses to experimental glacier-runoff reduction in alpine rivers
Glacier retreat due to climate change can affect the biodiversity and ecosystem function. Here, Cauvy-Fraunié and colleagues manipulated the flow of tropical glacier-fed stream in the Ecuadorian Andes, and show that benthic fauna community composition requires several months before it can recover to the pre-blockade conditions.
- Sophie Cauvy-Fraunié
- , Patricio Andino
- & Olivier Dangles
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Article
| Open AccessLarge increases in carbon burial in northern lakes during the Anthropocene
The rate at which carbon burial has changed in lakes in response to human-induced global change is poorly understood. Here, the authors show that carbon burial has increased significantly in remote northern lakes along with increased nitrogen deposition and warming over the last century.
- Adam J. Heathcote
- , N. John Anderson
- & Paul A. del Giorgio
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Article
| Open AccessTop consumer abundance influences lake methane efflux
How aquatic communities influence biogeochemical cycling is not well understood. Here, Devlin et al.manipulate the abundance of fish in a whole-lake experiment and show that methane efflux is reduced by the presence of top predators, via a trophic cascade from zooplankton to methanotrophic bacteria.
- Shawn P. Devlin
- , Jatta Saarenheimo
- & Roger I. Jones
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Article
| Open AccessFood-web stability signals critical transitions in temperate shallow lakes
How mechanisms underlying food-web stability may influence ecosystem regime shifts is not well understood. Combining food-web and ecosystem modelling, Kuiperet al. show that destabilizing reorganization of a small number of key trophic interactions precede catastrophic changes in shallow lake ecosystems.
- Jan J. Kuiper
- , Cassandra van Altena
- & Wolf M. Mooij
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High rates of anaerobic methane oxidation in freshwater wetlands reduce potential atmospheric methane emissions
Freshwater wetlands are among the largest natural sources of methane to the atmosphere. Here, the authors report rates of anaerobic methane oxidation which rival those in marine environments, highlighting the importance of a long-overlooked anaerobic methane sink.
- K. E. A. Segarra
- , F. Schubotz
- & S. B. Joye
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A freshwater predator hit twice by the effects of warming across trophic levels
Species responses to climatic change are likely to be complex, acting across multiple trophic levels and life stages. Here the authors show that Arctic charr are negatively impacted by trophic mismatches affecting both juveniles and fry, which may be responsible for recent poor catches of this fish.
- Tomas Jonsson
- & Malin Setzer