Limnology

  • Article
    | Open Access

    Anoxic lake sediments are thought to be the major source of the high amount of methane emitted from freshwaters. Here Günthel and colleagues find unexpected quantities of this greenhouse gas are produced in lake surfaces, indicating an overlooked global importance from oxygenated sources.

    • Marco Günthel
    • , Daphne Donis
    • , Georgiy Kirillin
    • , Danny Ionescu
    • , Mina Bizic
    • , Daniel F. McGinnis
    • , Hans-Peter Grossart
    •  & Kam W. Tang
  • Article
    | Open Access

    The variations in overbank flow from rivers onto floodplains from regional to continental scales are understudied. Here, the authors investigate this variation as a function of hydroclimatic parameters and channel size in the conterminous U.S. and find that the timing of floodplain inundation is largely controlled by regional factors, while the frequency, duration and magnitude of these inundations vary consistently with channel size.

    • Durelle T. Scott
    • , Jesus D. Gomez-Velez
    • , C. Nathan Jones
    •  & Judson W. Harvey
  • Article
    | Open Access

    Rivers are thought to be the largest source of the recalcitrant and abundant black carbon in the ocean. Here, Wagner and colleagues find distinct pools of black carbon between rivers and the open ocean, challenging the long-held assumption that marine black carbon is of terrestrial origin.

    • Sasha Wagner
    • , Jay Brandes
    • , Robert G. M. Spencer
    • , Kun Ma
    • , Sarah Z. Rosengard
    • , Jose Mauro S. Moura
    •  & Aron Stubbins
  • Article
    | Open Access

    Freshwater systems are important components of the carbon cycle, but the extent of their role in CO2 fluxes is poorly understood. Here Horgby and colleagues show that mountain streams are a surprisingly large source of CO2 to the atmosphere, with annual emissions that belie their spatial extent.

    • Åsa Horgby
    • , Pier Luigi Segatto
    • , Enrico Bertuzzo
    • , Ronny Lauerwald
    • , Bernhard Lehner
    • , Amber J. Ulseth
    • , Torsten W. Vennemann
    •  & Tom J. Battin
  • Article
    | Open Access

    Diatoms drive biogeochemical cycling of aluminum by incorporating this element into their shells, but this process has not been quantified in freshwater systems. Here the authors quantify diatom-mediated aluminum fluxes in lakes and determine that they rival the aluminum sink in the global ocean.

    • Dong Liu
    • , Peng Yuan
    • , Qian Tian
    • , Hongchang Liu
    • , Liangliang Deng
    • , Yaran Song
    • , Junming Zhou
    • , Dusan Losic
    • , Jieyu Zhou
    • , Hongzhe Song
    • , Haozhe Guo
    •  & Wenxiao Fan
  • Article
    | Open Access

    The Western Siberia Lowland (WSL) is the world’s largest frozen peatland complex, however carbon emissions (CO2+CH4) from lakes in this region remain unknown. Here, the authors sample 76 lakes and show high carbon emissions from lakes across all permafrost zones in the WSL.

    • S. Serikova
    • , O. S. Pokrovsky
    • , H. Laudon
    • , I. V. Krickov
    • , A. G. Lim
    • , R. M. Manasypov
    •  & J. Karlsson
  • Article
    | Open Access

    .Agricultural intensification and a growing human population are likely to increase the eutrophication of lakes and impoundments over the next century.  Here, the authors show that this enhanced eutrophication will substantially increase emissions of methane (+ 30–90%), a potent greenhouse gas, from these systems over the next century.

    • Jake J. Beaulieu
    • , Tonya DelSontro
    •  & John A. Downing
  • Article
    | Open Access

    Permafrost carbon feedback modeling has focused on gradual thaw of near-surface permafrost leading to greenhouse gas emissions that accelerate climate change. Here the authors show that deeper, abrupt thaw beneath lakes will more than double radiative forcing from permafrost-soil carbon fluxes this century.

    • Katey Walter Anthony
    • , Thomas Schneider von Deimling
    • , Ingmar Nitze
    • , Steve Frolking
    • , Abraham Emond
    • , Ronald Daanen
    • , Peter Anthony
    • , Prajna Lindgren
    • , Benjamin Jones
    •  & Guido Grosse
  • Article
    | Open Access

    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
    • , Stephen K. Hamilton
    • , Emma J. Rosi
    •  & David M. Post
  • Article
    | Open Access

    Methane emissions from lakes vary by orders of magnitude, leaving large uncertainty in regional and global carbon budgets. Here the authors show that phenols from forest litter act as a latch to suppress microbial activity and produce over 400-times less methane than the decomposition of aquatic plant litter.

    • E. J. S. Emilson
    • , M. A. Carson
    • , K. M. Yakimovich
    • , H. Osterholz
    • , T. Dittmar
    • , J. M. Gunn
    • , N. C. S. Mykytczuk
    • , N. Basiliko
    •  & A. J. Tanentzap
  • Article
    | Open Access

    The effect of Asian summer monsoon hydrological changes on key biogeochemical processes remains poorly understood. Here, using a suite of biomarkers, the authors reconstruct palaeohydrological conditions during the Holocene and show that the peatland carbon cycle is strongly sensitive to paleohydrological changes.

    • Xianyu Huang
    • , Richard D. Pancost
    • , Jiantao Xue
    • , Yansheng Gu
    • , Richard P. Evershed
    •  & Shucheng Xie
  • Article
    | Open Access

    Arctic ecosystems are at threat due to the rapid nature of climate change and Arctic amplification. Here, the authors show that the watershed of Lake Hazen, the Arctic’s largest lake by volume, has undergone dramatic changes in response to as little as a ~1°C increase in summer air temperatures.

    • Igor Lehnherr
    • , Vincent L. St. Louis
    • , Martin Sharp
    • , Alex S. Gardner
    • , John P. Smol
    • , Sherry L. Schiff
    • , Derek C. G. Muir
    • , Colleen A. Mortimer
    • , Neil Michelutti
    • , Charles Tarnocai
    • , Kyra A. St. Pierre
    • , Craig A. Emmerton
    • , Johan A. Wiklund
    • , Günter Köck
    • , Scott F. Lamoureux
    •  & Charles H. Talbot
  • Article
    | Open Access

    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
    • , Jenny L. McCune
    • , Karin A. Nilsson
    • , Joseph Bennett
    • , Jennifer Firn
    • , Timothy Bartley
    • , James B. Grace
    • , Jocelyn Kelly
    • , Tyler D. Tunney
    • , Bailey McMeans
    • , Shin-Ichiro S. Matsuzaki
    • , Taku Kadoya
    • , Ellen Esch
    • , Kevin Cazelles
    • , Nigel Lester
    •  & Kevin S. McCann
  • Article
    | Open Access

    The magnitude of organic carbon burial in lakes and reservoirs is poorly constrained. Here, using a compilation of modern data from the literature and statistical modeling, the authors estimate a global yearly organic carbon burial of 0.15 Pg C in inland waters, of which 40% is stored in reservoirs.

    • Raquel Mendonça
    • , Roger A. Müller
    • , David Clow
    • , Charles Verpoorter
    • , Peter Raymond
    • , Lars J. Tranvik
    •  & Sebastian Sobek
  • Article
    | Open Access

    The contribution of methane (CH4) produced in oxic freshwaters to the global atmospheric CH4 budget is poorly constrained. Here, using a mass balance and in-situ incubations, the authors show that significant CH4 emissions are supported by CH4 produced in the oxic surface mixed layer in Lake Hallwil.

    • D. Donis
    • , S. Flury
    • , A. Stöckli
    • , J. E. Spangenberg
    • , D. Vachon
    •  & D. F. McGinnis
  • Article
    | Open Access

    The question of how significant barite deposits were able to form from early Earth’s low-sulfate seas remains controversial. Here, the authors show pelagic barite precipitation within a strongly barite-undersaturated ecosystem, highlighting the importance of particle-associated microenvironments.

    • Tristan J. Horner
    • , Helena V. Pryer
    • , Sune G. Nielsen
    • , Peter W. Crockford
    • , Julia M. Gauglitz
    • , Boswell A. Wing
    •  & Richard D. Ricketts
  • Article
    | Open Access

    The impacts of climate change on the Great Lakes’ ecosystems compared to historical records are unclear. Here, using paleolimnological evidence, the authors show that Lake Superior experienced a slow increase in productivity throughout the Holocene, but that this rate has increased in the last century.

    • M. D. O’Beirne
    • , J. P. Werne
    • , R. E. Hecky
    • , T. C. Johnson
    • , S. Katsev
    •  & E. D. Reavie
  • Article
    | Open Access

    Changes in penguin populations on the Antarctic Peninsula in recent decades have been linked to environmental factors such as sea ice. Here, the authors show that penguin colony change on Ardley Island, NW Antarctic Peninsula during the last 8,500 years was primarily driven by volcanic activity.

    • Stephen J. Roberts
    • , Patrick Monien
    • , Louise C. Foster
    • , Julia Loftfield
    • , Emma P. Hocking
    • , Bernhard Schnetger
    • , Emma J. Pearson
    • , Steve Juggins
    • , Peter Fretwell
    • , Louise Ireland
    • , Ryszard Ochyra
    • , Anna R. Haworth
    • , Claire S. Allen
    • , Steven G. Moreton
    • , Sarah J. Davies
    • , Hans-Jürgen Brumsack
    • , Michael J. Bentley
    •  & Dominic A. Hodgson
  • Article
    | Open Access

    Climate change can affect lake water level and nearby landscape. Korosi and colleagues show recent expansion of shallow lakes in the Canadian Northwest Territories is flooding critical habitat for the wood bison, and demonstrate the trickle-down effect of climate change on ecosystem functioning.

    • Jennifer B. Korosi
    • , Joshua R. Thienpont
    • , Michael F. J. Pisaric
    • , Peter deMontigny
    • , Joelle T. Perreault
    • , Jamylynn McDonald
    • , Myrna J. Simpson
    • , Terry Armstrong
    • , Steven V. Kokelj
    • , John P. Smol
    •  & Jules M. Blais
  • Article
    | Open Access

    Neurotoxic methylmercury can be found in high levels in aquatic systems, but the role of organic matter in methylmercury formation is not well understood. Here, Bravoet al. show that plankton-derived organic compounds enhance formation rates in boreal lakes.

    • Andrea G. Bravo
    • , Sylvain Bouchet
    • , Julie Tolu
    • , Erik Björn
    • , Alejandro Mateos-Rivera
    •  & Stefan Bertilsson
  • Article
    | Open Access

    Increased temperature and nutrient pollution are key features of anthropogenic change, but their dual effects on biodiversity remain unclear. Here Wanget al. conduct field experiments at two mountain elevation gradients to show that temperature and nutrients have independent and interactive effects on microbial diversity.

    • Jianjun Wang
    • , Feiyan Pan
    • , Janne Soininen
    • , Jani Heino
    •  & Ji Shen
  • Article
    | Open Access

    Lakes play a key role in our ecosystems and thus it is vital to understand their distribution and volume. Here, the authors present a new global lake database (HydroLAKES) and develop a new geo-statistical model to show global lake area, shoreline length, water volume and hydraulic residence times.

    • Mathis Loïc Messager
    • , Bernhard Lehner
    • , Günther Grill
    • , Irena Nedeva
    •  & Oliver Schmitt
  • Article
    | Open Access

    Due to increasing disturbance of peatlands, Southeast Asian rivers are thought to play a major role in the transfer of CO2to the atmosphere. Here, the authors present data collected from six Indonesian and Malaysian rivers and show that the region is not an outgassing hotspot as previously assumed.

    • Francisca Wit
    • , Denise Müller
    • , Antje Baum
    • , Thorsten Warneke
    • , Widodo Setiyo Pranowo
    • , Moritz Müller
    •  & Tim Rixen