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Ryan Sponseller

@ryansponseller.bsky.social
347 followers 298 following 4 posts

Umeå University (Sweden), Professor of Ecosystem Science

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Reposted by Ryan Sponseller
Amanda Gay DelVecchia @agdelv.bsky.social · 03/09/2026
PhD opportunity! Come study the dark side of streams with us 🌚https://amandadelvecchia.weebly.com/join-the-lab.html Interviews starting soon! (Yes that beautiful place is the study site 😍). @uncgeography.bsky.social
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Dave Hambright @davehambright.bsky.social · 23/08/2026
New in L&O (#ASLO_LO): Trait‐based responses of nitrogen‐fixing cyanobacteria to nitrogen limitation and light availability: Insights from 45 years of monitoring - Facey and Köhler aslopubs.onlinelibrary.wiley.com/doi/full/10.... @aslo.org
aslopubs.onlinelibrary.wiley.com
Trait‐based responses of nitrogen‐fixing cyanobacteria to nitrogen limitation and light availability: Insights from 45 years of monitoring
The degree to which N2-fixation compensates for reduced external nitrogen loading has significant implications for eutrophication recovery. We analyzed 45 years of monitoring data from the shallow, p....
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IceLab @icelabumu.bsky.social · 17/08/2026
Looking for an #interdisciplinary #postdoc in a supportive and intellectually stimulating environment? Look no further! One month left to apply for one of three #postdocfellowship in IceLab - apply by September 17: www.umu.se/en/icelab/ca... #scisky #phdsky #postdocsky #complexsystems
umu.se
Icelab Multidisciplinary Postdoctoral Programme
IceLab supports researchers to launch and land new collaborative projects that cross disciplines by funding a shared multidisciplinary postdoctoral fellow. The fellowship programme is made possible by...
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Andrew Barnes @barnesecodiv.bsky.social · 14/08/2026
Our paper has just been published in the latest issue of @nature.com! We analysed 318 food webs spanning marine, freshwater & soil ecosystems worldwide & found that ecosystem functioning increases consistently with biodiversity across multiple trophic levels. 🌐🧪🕷️🦠🍄🌿 www.nature.com/articles/s41...
nature.com
Food web complexity underlies biodiversity effects on ecosystem functioning - Nature
Analyses of the relationship between taxon richness and multi-trophic ecosystem functioning across marine, lake, stream and soil ecosystems show that food web complexity underlies biodiversity effects...
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Lenka Kuglerová @kuglerovastripe.bsky.social · 22/03/2026
Are you interested in riparian ecosystem science and management? Then join us in July in Kraków for the RIPA-2 conference. Abstract submission closing soon so hurry up! ripa-2.weebly.com
ripa-2.weebly.com
RIPA-2
WHAT IS RIPA-2 CONFERENCE?
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ManzoniLab @manzonilab.bsky.social · 20/03/2026
📢postdoc (18 months renewable) on modeling carbon dynamics in the soil-plant system, with a focus on grasslands emploi.cnrs.fr/Offres/CDD/U...
emploi.cnrs.fr
Portail Emploi CNRS - Job offer - Evaluation of the capacity of soil plant models to simulate carbon stock variations in permanent and temporary grasselands (M/F)
CNRS on the web
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Ryan Sponseller @ryansponseller.bsky.social · 03/03/2026
We are hiring a PhD student at Umeå University to work on GHG dynamics in boreal streams and groundwater. See the following advertisement and reach out with any questions! www.umu.se/en/work-with... @grocherros.bsky.social
umu.se
PhD position in Physical Geography, focusing on greenhouse gas dynamics in streams and groundwater
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Michael J. Gundale @michael-gundale.bsky.social · 18/02/2026
I am really excited to share our new paper, published today in Nature. We show that rising atmospheric CO2 is linked to decling nutrient availability in boreal forest, with implications for the future carbon sink. Kudos to lead author @kelleyrbassett.bsky.social. www.nature.com/articles/s41...
nature.com
Rising atmospheric CO2 reduces nitrogen availability in boreal forests - Nature
Nitrogen isotope tree-ring chronologies show that rising atmospheric CO2 has reduced nitrogen availability in boreal forests in Sweden, suggesting that elevated atmospheric CO2 is causing oligotrophic...
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Li Li (李黎) @lireactivewater.bsky.social · 27/01/2026
Does discharge Q drive chemistry C in intermittent streams? No. They depend more on dry-wet transitions Highly variable CQ at low Q change to consistent CQ at high Q, signalling a switch from a biogeochemistry-driven dry to flow-driven wet state agupubs.onlinelibrary.wiley.com/doi/10.1029/...
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Stefan Hupperts 🌲🍄🦠🏳️‍🌈 @stefhupperts.bsky.social · 04/08/2025
I'm so excited to share our new paper in Global Change Biology: A network of 18 wildfire chronosequences reveals key environmental drivers and knowledge gaps in the boreal nitrogen balance, with @michael-gundale.bsky.social and others. doi.org/10.1111/gcb....
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Scott F Collins @streamnerd.bsky.social · 17/07/2025
Asymmetric competition among stream fishes: Do food web pathways affect competitive outcomes? - George - 2024 - Ecosphere - Wiley Online Library esajournals.onlinelibrary.wiley.com/doi/full/10.... Please check out our paper! Share too! #invasivespecies #ecology #foodweb #conservation
esajournals.onlinelibrary.wiley.com
Asymmetric competition among stream fishes: Do food web pathways affect competitive outcomes?
Limiting resources are often unevenly distributed among competing consumers, as larger, more aggressive, fast growing, early emerging, or rapidly reproducing species disproportionately exploit food o...
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Bob Hilton @profbobhilton.bsky.social · 27/05/2025
New job! Please repost - Post doc @oxuniearthsci.bsky.social on The Security of #CarbonDioxide Drawdown During #EnhancedRockWeathering Does downstream #carbonate formation happen? How? How much? How quick? Apply by 12 June my.corehr.com/pls/uoxrecru...
my.corehr.com
Job Details
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Ben Bond-Lamberty @benbondlamberty.bsky.social · 25/04/2025
Global Soil Methane Uptake Estimated by Scaling Up Local Measurements: Jiang et al. in @globalchangebio.bsky.social onlinelibrary.wiley.com/doi/10.1111/...
onlinelibrary.wiley.com
Global Soil Methane Uptake Estimated by Scaling Up Local Measurements
We develop a data-driven approach to refine this global estimate by incorporating local data of 79,800 flux measurements from 198 sites, this novel approach links the global SMU budget to local SMU f....
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Ryan Sponseller @ryansponseller.bsky.social · 08/04/2025
Last week to apply!
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Nate Jones @floodhydrology.bsky.social · 27/03/2025
Big CONGRATS to @kacizarek.bsky.social!!! Her new paper is out in @agu.org's JGR-B! The paper has a little bit of everything -- N biogeochemistry, intermittent stream hydrology, concentration-connectivity relationships! Check it out here: agupubs.onlinelibrary.wiley.com/doi/full/10....
Conceptual figure illustrating predicted biogeochemical responses to changes in network connectivity and streamflow. (a) At the watershed outlet, we predicted NO3− export would increase in response to increasing watershed‐scale connectivity and streamflow, resulting in an enrichment of NO3− downstream. As watershed‐scale connectivity (active surface drainage network length) and streamflow decrease in the dry‐down, NO3− export will decrease due to N source limitations. (b) Throughout the watershed, we predicted the seasonal dry‐down period to be the greatest potential for denitrification to occur given the availability of both NO3− and dissolved organic carbon, anoxic conditions, and decreased streamflow.
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Tamlin Pavelsky @globalhydro.bsky.social · 19/03/2025
Do you work on lakes globally? Check out what is, to my mind, the most complete global database of lakes (~6M) and associated attributes, newly published in WRR. Also the basis for SWOT lake data. agupubs.onlinelibrary.wiley.com/doi/full/10....
Map of global lake distribution, colored by the number of SWOT overpasses per 21 day cycle. There are many lakes with a high number of SWOT overpasses at high northern latitudes, but there are also tens of thousands to more than a million lakes on every continent. Lakes are graphed by latitude and longitude on the edges of the figure.
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Robert G. Björk @robertgbjork.bsky.social · 15/03/2025
🚨We are hiring🚨ECR with a PhD within 7 years? Tenure track position (akin to Assistant Prof) in Earth and Env Data Science at U of Gothenburg, Sweden. Expertise in remote sensing and machine learning. Work on climate change, Earth systems, biodiversity, #EO, #UAV Deadline May 10 tinyurl.com/58ft38du
tinyurl.com
Associate Senior Lecturer in Earth and Environmental Data Science
Associate Senior Lecturer in Earth and Environmental Data Science At the Department of Earth Sciences, we
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Robert Ladwig @hydrobert.bsky.social · 12/03/2025
Work with me on getting depth-discrete profiles of water quality using high-frequency loggers and microCTD measurements! And then let’s be creative to infer mechanisms that could improve mechanistic modeling.
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Ryan Sponseller @ryansponseller.bsky.social · 05/03/2025
We are hiring a postdoc at Umeå University in aquatic ecosystem ecology. See the link for details! www.umu.se/en/work-with... @grocherros.bsky.social
umu.se
Postdoc (2 years) in aquatic ecosystem ecology
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Ben Bond-Lamberty @benbondlamberty.bsky.social · 24/02/2025
My @pnnl.bsky.social colleague James Stegen leads "Reviews and syntheses: Variable inundation across Earth's terrestrial ecosystems" bg.copernicus.org/articles/22/...
bg.copernicus.org
Reviews and syntheses: Variable inundation across Earth's terrestrial ecosystems
Abstract. The structure, function, and dynamics of Earth's terrestrial ecosystems are profoundly influenced by how often (frequency) and how long (duration) they are inundated with water. A diverse ar...
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AU Freshwater Ecology @freshwaterau.bsky.social · 27/01/2025
If plankton to plants is catastrophic or not time the great tester In our group a highlight has been using long-term monitoring data to test ideas in ecology. Here we asked “does the theory of the alternative stable states in shallow lakes stand the test of time?” doi.org/10.1038/s414...
doi.org
Bimodality and alternative equilibria do not help explain long-term patterns in shallow lake chlorophyll-a - Nature Communications
Shallow lakes have long been considered an example of alternative equilibria in ecological systems. Here, the authors combine empirical data and simulations to show that the relationship of shallow la...
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Gerard Rocher-Ros @grocherros.bsky.social · 24/01/2025
"Abrupt transformation of west Greenland lakes following compound climate extremes associated with atmospheric rivers". This new article in PNAS by Jasmine Saros and colleague Vendy Hazuková is pretty striking www.pnas.org/doi/full/10....
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Jess Corman @limnojess.bsky.social · 23/01/2025
My first post on bsky to announce my first solo author paper is out in @aslo.org L&O Letters. doi.org/10.1002/lol2... Thanks to lots of amazing conversations with collaborators and a call out on that other social media to gather info on lakes, rivers, streams, wetlands, etc with calcium carbonate.
Images of calcium carbonate deposits as travertine, covering leaves, as microbialites, on a macroinvertebrate, as a whiting event in a lake, and as a benthic microbial mat.
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Micael Jonsson @micaeljonsson.bsky.social · 20/01/2025
Does tree presence promote or hamper soil organic matter turnover? Well... both! Read about our exciting results from the treeline ecotone in Abisko, Sweden. #gadgil #priming #litterdecomposition onlinelibrary.wiley.com/doi/epdf/10....
onlinelibrary.wiley.com
Trees First Inhibit Then Promote Litter Decomposition in the Subarctic
You have to enable JavaScript in your browser's settings in order to use the eReader.
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IceLab @icelabumu.bsky.social · 13/01/2025
As of January 1st, Stress Response Modeling at IceLab has officially welcomed @grocherros.bsky.social as a new Assistant professor! Read more about Gerard: www.umu.se/en/feature/r... #complexsystems #ecology #environmentalscience #climatechange #carbonflows
umu.se
From land to sea with a focus on the climate
Gerard Rocher-Ros wants to understand the flow of carbon and nutrients to find solutions to climate change.
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Richard Mason @riccomason.bsky.social · 07/01/2025
We often think of rivers as linear features, but lateral dynamics are just as important and often overlooked! In our paper we present a framework for the study and management of rivers which emphasises lateral connectivity. #floodplainconnectivity #riverrestoration Link to paper shorturl.at/ri3lA
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Nicole Wagner @nicolewagner.bsky.social · 31/12/2024
Check out our new paper in Ecology Letters! We examined how the N-fixing cyanobacteria Dolichospermum's ionome and physiology changed in response to short—and long-term adaptation to different N supplies. Take home: There is a lot more than Fe changing in diazotrophs. doi.org/10.1111/ele....
doi.org
Current and Historical Resource Nitrogen Supply Affects the Eco‐Physiological Traits and the Ionome of a Diazotrophic Cyanobacterium
Diazotrophic cyanobacteria can overcome nitrogen (N)-limitation by fixing atmospheric N2; however, this comes with increased energetic, iron, molybdenum, and boron costs. Here, we examined the change...
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Ryan Sponseller @ryansponseller.bsky.social · 12/12/2024
Nice opportunity here!
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IceLab @icelabumu.bsky.social · 11/12/2024
The sky above Umeå has been colorful lately (when it's not pitch black that is). Everyone in IceLab has seen these. Except the fish. 🐠 They're just doing their regular fishy things.
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Gerard Rocher-Ros @grocherros.bsky.social · 08/12/2024
I am soon recruiting two PhDs and a postdoc, to work on carbon, methane, metabolism in arctic stream networks. Glad to chat potential opportunities during #AGU24 @agu.org ! There is also soon another postdoc position on oxygen responses to peatland restoration with @ryansponseller.bsky.social ⬇️
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Gerard Rocher-Ros @grocherros.bsky.social · 27/11/2024
New article by Rebecca Hale and others in Limnology and Oceanography: "Diel dissolved organic matter patterns reflect spatiotemporally varying sources and transformations along an intermittent stream" aslopubs.onlinelibrary.wiley.com/doi/full/10....
aslopubs.onlinelibrary.wiley.com
Diel dissolved organic matter patterns reflect spatiotemporally varying sources and transformations along an intermittent stream
Stream dissolved organic matter (DOM) is a globally important carbon flux and a locally important control on stream ecosystems, and therefore understanding controls on stream DOM fluxes and dynamics ...
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