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Hannah Holland-Moritz

@hhollandmoritz.bsky.social
770 followers 300 following 34 posts

Microbial ecologist. Modeler. Moonlighting historian & language nerd. Opinions and spelling mistakes are my own. (she/her/hers)

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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 26/03/2025
SoilBioME the amazing team I'm a part of now has socials! We are on LinkedIn www.linkedin.com/company/soil... www.instagram.com/soilbiome/, and Instagram and our BlueSky TBA. Follow us for updates from Serita Frey, @stuartsoil.bsky.social, Jessica Ernakovich, and Alix Contosta's groups.
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 23/02/2025
Both of these have been such easy wins. They will make life easier for me and my labmates and save us so much money in both materials and person-time. These small win-win-wins are what I need right now.
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 23/02/2025
Thing 2: 96-well plate washer Cost: $2 in plastic $15 for a pack of 14 gauge cannulae (not pictured) 20 minutes of my time Commercial cost: $8000
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 23/02/2025
Thing 1: Magnetic bead plate for library prep. Cost: $1.50 for plastic $30 for magnets and their shipping + 20 minutes of my time including: finding the pattern, walking to the maker space, uploading the design, collecting the printed design and putting in the magnets. Commercial cost: $1106.65
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 23/02/2025
One way I'm trying to stay sane in all this madness is small, daily dopamine boosts. In the last 3 weeks it's been making friends with folks at the maker space in the campus building nextdoor and printing small tools for the lab from thingyverse that are normally obscenely expensive.
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 09/02/2025
Finally: This paper would not have been possible without close collaboration (weekly meetings for 4 yrs!) between the co-first authors: Our expertise included metabolism, community ecology, cutting-edge bioinformatics. We had further collaborations with biogeochemists, and ecosystem ecologists.
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 09/02/2025
Ultimately this paper raises important questions for ecology at a time when Anthropocene-Earth faces its most purturbed-state to date: What are the conditions of stability? When do these "stable states in an unstable landscape" hit their tipping points and can we predict it?
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 09/02/2025
And the kicker: Some of those generalists are better indicators of the isotopic composition of methane than methanogens themselves!
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 09/02/2025
We were able to show through multi-layer network modeling that strong subcommunities of generalists helped bouy vulnerable specialists from changing conditions, and possibly also help provide nitrogen sources for them.
A figure from the paper showing a subnetwork of generalists (red) that surround a prominent methanogen (M. Stordalenmirensis - blue). The generalists show persistent correlations to methane composition, in some cases stronger than those of the methanogen itself.
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 09/02/2025
Luckily, because we had so much multi-layered 'omics and biogeochemical data, we were able to tease apart likely reasons for the stability of microbes in each thaw stage habitat: Functional redundancy and possible community 'rescue' through high dispersal rates in a water-logged habitat.
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 09/02/2025
We grappled with the definition of stability, and how and when it applied. We also looked at other long-term studies to try to determine if our findings were unique, or if this was a general rule of microbial communities. (I lean towards the general rule side of the debate).
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 09/02/2025
We took a "leave-no-stone-unturned" approach: looking at organisms, functions, and community organization across multiple levels of granularity to prove to ourselves, beyond a doubt that the communities not only demonstrated resistance to change, but also hints of resilience.
A power-point slide showing two ordination plots with arrows and the title "Across time microbes are resistent to change within habitat". On the left - an ordination showing species composition, on the right, functional capacity of the microbial community. Communities bounce around within the habitat area over time, but do not exceed its bounds. This demonstrates one of the many metrics of stability that we applied in this study.
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 09/02/2025
Next came our hardest tasks yet, 1) proving to ourselves that what we were really seeing was true 'stability' 2) trying to figure out why these communities showed such resistance to change.
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 09/02/2025
You might notice that all of these questions revolved around a constant: change. The one thing we *didn't* expect to see was a stable community. And yet... each line of evidence we looked into, suggested just that. A surprising stability, & resistance to change in the communities in each habitat.
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 09/02/2025
Microbial activity is well-known for being sensitive to to temperature so we wanted to investigate how the changes over 7 years affected the microbial communities in these habitats. How had they changed? Where there any new functions? What processes where shaping their interactions?
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 09/02/2025
Stordalen Mire is underlain by permafrost which thawing rapidly, shifting the landscape from carbon-sink to potential carbon source. This carbon release is mediated by microbes that inhabit the three "canonical" habitats in the Mire that form a permafrost thaw gradient (Palsas -> Bogs -> Fens).
Mean annual temperature at Abisko Sweden over the last 100 years. The temperature starts rising around 1970 and continues to the present day. Soil temperatures at our sampling sites at different depths show significant rise over the 7 years of the study.
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 09/02/2025
I (and most of the first-authors) came late to the game on this data - we stand on the shoulders of 10+ years of giants. Each year a field team from @emerge-bii.bsky.social has painstakingly collected 'omics, biogeochemical, and carbon flux data from Stordalen Mire in Sweden.
Overview figure of the study site, a mire in sweden with two lakes to either side. A boardwalk cuts through with scientific instruments placed along it. Photo credit: Scott SaleskaOverhead shot of two scientists processing a sample core from the peatland. They squat on the side of the boardwalk. One cuts the core with a knife on a cookie sheet, while the other prepares a vial to receive the sample. Pre-labelled vials, a measuring tape, and ethanol and gloves cover the boardwalk. A cooler waits in the upper part of the photo to recieve the sample.
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 09/02/2025
🚨🚨🚨 New pre-print alert: "Stable states in an unstable landscape: microbial resistance at the front line of climate change" doi.org/10.1101/2025... Probably the most complex paper I have ever worked on. It took 4 (!) co-first authors to accomplish and literal years to decipher the story.
doi.org
Stable states in an unstable landscape: microbial resistance at the front line of climate change
Microbiome responses to warming may amplify or ameliorate terrestrial carbon loss and thus are a critical unknown in predicting climate outcomes. We quantified microbial warming response over seven ye...
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 06/02/2025
New Paper Alert: "Permafrost pore structure and its influence on microbial diversity" - Great interdisciplinary and technically challenging paper led by the talented @nate-blais.bsky.social authors.elsevier.com/sd/article/S...
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 13/01/2025
My neighborhood and childhood home. At minute 1:20 in this video. Complete obliteration. youtu.be/_AerpEUm0Wo?...
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 13/01/2025
While your point stands, I want to point out that while it may seem like the same fire, the two fires are distinct, just happening at the same time and nearby. In fact residents of Altadena are feeling like they have to compete for media attention drawn by the more affluent Palisades area.
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 11/01/2025
Absolutely. The only good thing about not being there right now is I can help get information to those who are. (Been listening to the scanner almost non-stop the last 3 days)
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 11/01/2025
I babysat and tutored younger kids on the street. It wasn't an affluent neighborhood (despite what people say about those who live in LA suburbs), its wealth was people and love. This is what I and others who call Altadena home have truly lost. Not just homes, and physical property but community.
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 11/01/2025
stretched a volleyball net across the street. Kids played at each others houses, adults were kind and caring to all the kids on the block.
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 11/01/2025
That neighborhood is still the standard of the community I aspire to live in. We had yearly block parties where neighbors would invade our kitchen for the night, marinating for tomorrow's BBQ - one man volunteered his yard for a bounce house (his kids were grown), and we...
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 11/01/2025
In this picture courtesy of Maxar everything red is unburnt. The neighborhood I lived in? Pretty much dead center in this photo.
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 11/01/2025
The Jewish temple where I went to school and marked milestones of childhood and young adulthood was one of the first structures to go. (They got the people and torahs out though, which is the most important thing, if you're Jewish).
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 11/01/2025
So many memories: The library whose YA, SciFi, and history sections I knew like the back of my hand - destroyed. The Rite Aid we'd walk to to get ice cream to celebrate family wins, also gone.
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 11/01/2025
The neighborhood I grew up is destroyed, every house on the street but one looks like this:
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 11/01/2025
I posted this elsewhere, but not yet here, so for completeness' sake: My childhood home has burned down in the Eaton fire. As have my elementary school and many other places of my childhood. My parents are safe but got out with just two bags of necessities. Feeling lots of things right now.
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 22/04/2024
Happy science moment: I often feel jaded about my future role in academia. But today I looked at a list of ECR's in a field I'm growing into, and was filled excitement and joy at the prospect of getting to work more closely with such awesome and friendly people. Thanks folks, you make it worth it.
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Reposted by Hannah Holland-Moritz
Roland Hatzenpichler @environmicrobio.bsky.social · 16/01/2024
Please share: Are you a data creator/user in #metagenomics or other #omics? We’re working on standards for fair data reuse and would like your feedback. We welcome contributions by scientists from all career stages. 5-min anonymous survey here: tinyurl.com/y5kwytpd
tinyurl.com
Survey: “A roadmap for fair reuse of public microbiome data”
This survey will inform a manuscript titled “A roadmap for fair reuse of public microbiome data”, the abstract of which and core figure (Figure 1) are included below. The manuscript in its current...
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 06/11/2023
How do you spend your Sunday night laundry time? This week, I made a @Toolik-themed palette for R, which @paxrodana modified to make colorblind friendly. See it featured soon in @FMontanoLopez , @paxrodana, and @science_chump papers!
Non-colorblind friendly palette featuring 12 colors permafrost (grey), clay (orange brown), silt (tan-brown), O horizon (deep purple brown), crowberry (violet), arctic blue (ice blue), tundra green (light pale green), peltigera (the green of peltigera lichen), hylocomium splendens (the green of feather moss), arctic sunrise (orangey-yellow), cloudberry (pale orange-red), lingon berry (light burgundy red).Colorblind friendly palette featuring 12 colors permafrost (grey), clay (orange brown), arctic sunrise (warm yellow), O horizon (deep purple brown), crowberry (violet), arctic blue (ice blue), koyukuk river (light turquoise), prudhoe bay (dark turquoise), sphagnum fimbriatum (pale yellow-green, similar to cladonia lichen), cloudberry (pale orange-red), lingon berry (mid burgundy red).
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 30/10/2023
Exciting start to this week's #ACSMTG in St. Louis! Luckily I was up already and working on my talk. (Everyone is fine!) I got to meet some fellow attendees staying in the same building. #networking??
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Hannah Holland-Moritz @hhollandmoritz.bsky.social · 18/10/2023
@adeenaa.bsky.social just joined!
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Reposted by Hannah Holland-Moritz
Sarah Bagby @scbagby.bsky.social · 18/10/2023
Applications for @emerge-bii.bsky.social's 2024 Summer Program are open! Great chance to learn key tools and foundational science for interdisciplinary ecosystem science. Open to all career levels. drive.google.com/file/d/1UsYA...
drive.google.com
EMERGE_Summer_Program_Flyer_2024.pdf
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Reposted by Hannah Holland-Moritz
Allison Horst @allisonhorst.bsky.social · 23/08/2023
Teaching intro data science or stats in environmental sciences / ecology this fall? The lterdatasampler package is now on CRAN, with curated real world datasets from the US Long Term Ecological Research program! Check it out: lter.github.io/lterdatasamp...
A hexagonal design with the words lterdatasampler at the top. Within the border are plants, animals and weather patterns representing the different datasets currently in the package.
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