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Mark J McCarthy

@mjmcncycle.bsky.social
176 followers 277 following 84 posts

Aquatic nitrogen biogeochemist/ecologist, dad, wine geek, Canadian indie nerd. Trust takes years to build, seconds to break, forever to get back.

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Mark J McCarthy @mjmcncycle.bsky.social · 22/09/2026
Out of curiosity, did you do similar analyses for sediment TN v external N loads?
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Mark J McCarthy @mjmcncycle.bsky.social · 27/08/2026
Moonrise over Lake Balaton on World Lake Day. (TBH I think these "World <insert some random thing here> Days are kinda dumb, but whatever).
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Mark J McCarthy @mjmcncycle.bsky.social · 27/08/2026
Best song most people have never heard?
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Mark J McCarthy @mjmcncycle.bsky.social · 27/08/2026
These emissions are also amplified by excess N, and we also need to improve N management, in addition to P, to help mitigate eutrophication and climate change.
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Mark J McCarthy @mjmcncycle.bsky.social · 27/08/2026
Wizz Air, no-recline seats!! Hallelujah
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Mark J McCarthy @mjmcncycle.bsky.social · 24/08/2026
Hmmmmmmm.....
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Mark J McCarthy @mjmcncycle.bsky.social · 14/08/2026
Hope you'll make it over to the other side of the Baltic (Estonia) on the next trip, Ron!
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Mark J McCarthy @mjmcncycle.bsky.social · 12/08/2026
At least so far, biggest accomplishment of the Lake Balaton project is (possibly?) being able to pronounce the city Székesfehérvár.
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Mark J McCarthy @mjmcncycle.bsky.social · 01/08/2026
The sign is real and has been there for years. Nice try though.
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Mark J McCarthy @mjmcncycle.bsky.social · 01/08/2026
Indeed.
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Mark J McCarthy @mjmcncycle.bsky.social · 30/07/2026
Hungarian wine is totally underrated.
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Mark J McCarthy @mjmcncycle.bsky.social · 29/07/2026
…and they excrete reduced N forms and very labile OM, which help fuel non-N-fixing cyanos making N rich toxins.
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Mark J McCarthy @mjmcncycle.bsky.social · 22/07/2026
That’s the dumbest thing I’ve read today. Remarkably dumb.
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Mark J McCarthy @mjmcncycle.bsky.social · 17/07/2026
These are 'normal' people according to this nazi www.youtube.com/watch?v=DXnH...
youtube.com
Video Of Capitol Riot Shown During First Jan. 6 Committee Hearing
YouTube video by NBC News
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Eliot Higgins @eliothiggins.bsky.social · 08/07/2026
This is like Jeffrey Epstein lecturing us on feminism.
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Mark J McCarthy @mjmcncycle.bsky.social · 06/07/2026
@blauwalg.bsky.social @mairamucci.bsky.social
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Mark J McCarthy @mjmcncycle.bsky.social · 06/07/2026
What's this? A paper on lake restoration that not only acknowledges but also addresses internal sediment N loading? 😱😱😱 What next, external N loading targets for Lake Erie? (Likely not, barring some retirement parties/progress.) www.sciencedirect.com/science/arti...
sciencedirect.com
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Wilhelm Lab at the University of Tennessee @tn-marine-micro.bsky.social · 25/06/2026
We’re hiring! A joint Postdoc at UT Knoxville (Wilhelm & @dtalmy.bsky.social) to study Microcystis, oxidative stress, toxin production, and nutrient selection using lab, field, molecular, and modeling approaches. PhD required. Apply: fa-ewlq-saasfaprod1.fa.ocs.oraclecloud.com/hcmUI/Candid...
fa-ewlq-saasfaprod1.fa.ocs.oraclecloud.com
Post-Doctoral Research Associate: Freshwater Microbial Ecology - UTK
The Wilhelm and Talmy research groups in the Department of Microbiology at the University of Tennessee invites applications for a Postdoctoral Research Fellow to join an interdisciplinary project exam...
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Mark J McCarthy @mjmcncycle.bsky.social · 22/06/2026
Join the club mfer
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Mark J McCarthy @mjmcncycle.bsky.social · 21/06/2026
“The most durable solution…is still to remove the nutrient source and, ideally, remove algal biomass from the water. If you only kill algae in place, some of that biomass can break down and release nutrients back into the water, which means the bloom can return later.” phys.org/news/2026-06...
phys.org
Nanobubbles for algae cleanup: Q&A with researcher Wen Zhang
One of the most powerful environmental cleaning technologies in recent years is too small to see with the naked eye. Nanobubbles—tiny gaseous bubbles with diameters of around 100 nanometers—can clean ...
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Mark J McCarthy @mjmcncycle.bsky.social · 19/06/2026
@drlimnology.bsky.social
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Mark J McCarthy @mjmcncycle.bsky.social · 19/06/2026
It’s Scenedesmus per Euan Reavie, who got a sample.
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Mark J McCarthy @mjmcncycle.bsky.social · 19/06/2026
So the ‘theory’ has some validity, but there are problems (see my comments within the thread), starting with the bloom not being caused by cyanos, and the usual and incorrect ‘dismissal’ of the importance of nitrogen.
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Mark J McCarthy @mjmcncycle.bsky.social · 18/06/2026
One last important point. Treatments like H2O2 are band-aids, not ‘fixes’. Lysed algae cells release all of those nutrients back into the water. My concern would be replacing non-toxic green algae with cyanos using recycled nutrients to make biomass and N-rich toxins.
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Mark J McCarthy @mjmcncycle.bsky.social · 18/06/2026
And, the dominant taxa is Scenedesmus, a green algae (cannot fix atmospheric N), which means that it must make biomass from combined nitrogen. The problem here, among other things ofc, is nutrients, nitrogen and phosphorus...not one or the other, BOTH!
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Mark J McCarthy @mjmcncycle.bsky.social · 18/06/2026
No, not "typically phosphate" or "rarely nitrogen". Both are required to make biomass, and N is just as likely to be 'limiting' (see Elser et al. 2007; Ecology Letters 10). This kind of antiquated approach to aquatic science has severely inhibited progress in mitigating eutrophication globally.
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Mark J McCarthy @mjmcncycle.bsky.social · 05/06/2026
Monochrome lab tape ball from Mars?
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Mark J McCarthy @mjmcncycle.bsky.social · 04/06/2026
Curious whether this is a distributor issue or a Shimadzu issue? Heard anything similar for them in Europe?
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Mark J McCarthy @mjmcncycle.bsky.social · 02/06/2026
Look forward to reading it. I assume that N loading was also reduced (‘nutrient reductions’)…and some would argue that a shift to N fixers is a clear step in the right direction. Keep reducing external loads, and internal/legacy loads will eventually take care of themselves?
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Mark J McCarthy @mjmcncycle.bsky.social · 16/05/2026
Estonian frozen lab ‘making it official’ in Montréal @g-oguz.bsky.social
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Mark J McCarthy @mjmcncycle.bsky.social · 13/05/2026
Honored to be here to celebrate Jim Cotner’s long (and continuing) career.
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Mark J McCarthy @mjmcncycle.bsky.social · 11/05/2026
Back in the old PhD stomping grounds
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Mark J McCarthy @mjmcncycle.bsky.social · 10/05/2026
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Mark J McCarthy @mjmcncycle.bsky.social · 10/05/2026
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Mark J McCarthy @mjmcncycle.bsky.social · 10/05/2026
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Mark J McCarthy @mjmcncycle.bsky.social · 10/05/2026
Saw an excellent show in Kingston pre-ASLO/SIL, Georgia Harmer & Half Moon Run
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Mark J McCarthy @mjmcncycle.bsky.social · 18/04/2026
Lake Balaton vinos - a cab franc port-like dessert wine and a well aged ultra rare white made from a nearly extinct varietal (kéknyelü).
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Mark J McCarthy @mjmcncycle.bsky.social · 13/04/2026
Good timing for my Lake Balaton trip this week....beyond obvious current events, Balaton is (as far as I know) the cradle of 'internal N loading' studies in lakes. Amazing that, 25 years later, 'we' still think internal loads are just for P... onlinelibrary.wiley.com/doi/10.1111/...
onlinelibrary.wiley.com
Nitrogen uptake and the importance of internal nitrogen loading in Lake Balaton
1. The importance of various forms of nitrogen to the nitrogen supply of phytoplankton has been investigated in the mesotrophic eastern and eutrophic western basin of Lake Balaton. </br>2. Uptake rates o...
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Victory L. 🇨🇦🇵🇱🇺🇦🇦🇹🇾🇪 We are All Born Antifacist @victoryrenfrew.bsky.social · 08/04/2026
tiffinohio.net/posts/anti-l... Another republican pedo
tiffinohio.net
Anti-LGBTQ+ Christian author indicted on child sex abuse charges in Ohio
John Kent Tarwater, 55, a Christian author who wrote against LGBTQ+ rights, faces rape and sexual battery charges in Greene County involving victims as young as 10.
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Mark J McCarthy @mjmcncycle.bsky.social · 07/04/2026
Sigh...so close, and yet so far (plus bad timing).
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Mark J McCarthy @mjmcncycle.bsky.social · 01/04/2026
Don’t let anyone fool you about fossil fuels and nuclear. The market is deciding in real time.
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Mark J McCarthy @mjmcncycle.bsky.social · 26/02/2026
I typically receive 5-10 review requests per week. Most can immediately be declined because they do not match my expertise, most others declined due to unreasonable expected turnaround time. I accept 1-2 per month depending on my schedule.
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Mark J McCarthy @mjmcncycle.bsky.social · 17/02/2026
I don't need to be paid or recognized to accept a review. I need journals to better match manuscripts to my expertise (most are not even close) and give me a reasonable amount of time. How about ask me (1) are you interested, and (2) if so, how much time do you need to complete a thorough review?
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Antonio Bonasera @antoniobnsr.bsky.social · 09/02/2026
35001.
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Mark J McCarthy @mjmcncycle.bsky.social · 02/02/2026
Next time you find yourself on this side of the gulf, let me know, and stay warm up there!
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Mark J McCarthy @mjmcncycle.bsky.social · 02/02/2026
Not so far from Tartu if you want to come for a quick visit.
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Anthony Ricciardi @ecoinvasions.bsky.social · 23/01/2026
Greenland, a fragile ecosystem... "A new invasive species in sight!" "Which one?" "A big orange pig!"
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Nicholas Grossman @nicholasgrossman.bsky.social · 19/01/2026
Multi-layered “look what you made me do” lie. Because Norway didn’t give a him prize (it doesn’t decide winners) for ending wars (he didn’t end) the US won’t be peaceful anymore (bombing multiple countries) and will take Greenland (part of Denmark, not Norway) to stop Russia (it’d help Russia).
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Mark J McCarthy @mjmcncycle.bsky.social · 24/12/2025
If you don’t listen to Trad Attack!, you probably should…
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Mark J McCarthy @mjmcncycle.bsky.social · 03/12/2025
Lol. www.sciencedirect.com/science/arti...
sciencedirect.com
RETRACTED: Safety Evaluation and Risk Assessment of the Herbicide Roundup and Its Active Ingredient, Glyphosate, for Humans
This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://www.elsevier.com/locate/withdrawalpolicy)This article has b…
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