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Florian Hartig @florianhartig.bsky.social · Jul 14

Our new study “Human and apex predators shape lower trophic levels through top-down control”, led by Ye Htet Lwin and conducted in in Htamanthi Wildlife Sanctuary, northwestern Myanmar, now out in Biological Conservation www.sciencedirect.com/science/arti...

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Florian Hartig @florianhartig.bsky.social · Jul 14

I will soon open up calls for a PhD student (free choice of topic as long as it fits to our group) and a scientific programmer / ecological data scientist. If you know what we are doing and would like to join our team, feel free to get in touch.

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Florian Hartig @florianhartig.bsky.social · Jun 21

Our new article “Advancing general ecosystem models (GEMs): Towards a mechanistic understanding of the biosphere in the light of the Anthropocene” let by Joachim Paul Töpper just out at Ecological Solutions and Evidence dx.doi.org/10.1002/2688...

Advancing general ecosystem models (GEMs): Towards a mechanistic understanding of the biosphere in the light of the Anthropocene

General ecosystem models (GEMs) have been framed as the ‘climate model’ equivalents for nature, but while the latter have been continuously improved and diversified for several decades already, the f...

dx.doi.org

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BSG Göttingen @bsggoettingen.bsky.social · Mar 16

Spannender Artikel (Paywall) von @christianschwaegerl.mastodon.social.ap.brid.gy in der @faznet.bsky.social zur Diskussion über das Insektensterben & die Krefeld-Studie.

U.a. mit Argumenten von @sebseibold.bsky.social @florianhartig.bsky.social & Jens Dauber vom @thuenen.de.

Insektensterben: Warum Studien immer wieder kritisiert werden

An Studien, die nach den Ursachen für das Insektensterben suchen, wird viel Kritik geübt. Wie erklären Forscher, dass es unterschiedlichen Interpretationen gibt - und worin sind sich alle einig?

www.faz.net

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Florian Hartig @florianhartig.bsky.social · Feb 18

I‘ll answer here github.com/florianharti... , feel free to add to the discussion

Support for survival models, in particular Cox PH? · Issue #464 · florianhartig/DHARMa

Via https://bsky.app/profile/staffan.betner.nu/post/3liessyzzqc2z

github.com

Florian Hartig @florianhartig.bsky.social · Dec 12

That being said, I agree that standard S3 functions schools conform to R defaults as far as possible and I’ll have a look at the example you point out … there are a number of other standard S3 functions that we still need to implement

Florian Hartig @florianhartig.bsky.social · Dec 12

Hi Norm, thanks for your comments - if you encounter any bugs or have suggestions for changes, please post them at github.com/citoverse/ci...

Issues · citoverse/cito

Building and Training Neural Networks with an R interface - Issues · citoverse/cito

github.com

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Florian Hartig @florianhartig.bsky.social · Dec 6

deep neural networks in one line of R code, with convenient options for automatic hyperparameter tuning, xAI and bootstrapping.

The current CRAN version supports only fully connected DNNs, but our development version on GitHub also includes CNNs and multi-modal architectures.

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Florian Hartig @florianhartig.bsky.social · Dec 6

Looking for a simple way to do #deeplearning in #Rstats? Check out cito, available on #CRAN via cran.r-project.org/web/packages... and presented in this recent Ecography paper nsojournals.onlinelibrary.wiley.com/doi/full/10....

Cito is an interface to torch for R and supports building and training

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Florian Hartig @florianhartig.bsky.social · Dec 2

Nice! How do you see this in relation to ggeffects?

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Florian Hartig @florianhartig.bsky.social · Nov 25

All details and code in arxiv.org/abs/2411.15105

Is there a robust effect of mainland mutualism rates on species richness of oceanic islands?

In island biogeography, it is widely accepted that species richness on island depends on the area and isolation of the island as well as the species pool on the mainland. Delavaux et al. (2024) sugges...

arxiv.org

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Florian Hartig @florianhartig.bsky.social · Nov 25

But why does the effect appear in the first place? We believe the reason is that as mutualism rates are predicted by latitude, mutualism and latitude are perfectly nonlinear confounded. Using only a linear model, nonlinear effects of latitude create spurious effects of mutualism.

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Florian Hartig @florianhartig.bsky.social · Nov 25

The main issue we see is that the mutualism covariate is not measured, but predicted by a very simple model that only depends on latitude (R2 = 0.14). Predicting mutualism rates with a more precise model (R=0.39) removes any effect of this covariate in the main regression.

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Florian Hartig @florianhartig.bsky.social · Nov 25

In Nature, Delavaux et al., 2024 suggest that species richness on oceanic islands is reduced by mutualism rates on the mainland. In arxiv.org/abs/2411.15105, @maximilianpichler.bsky.social and I had another look at this question and conclude that this effect is likely a statistical artefact.

Is there a robust effect of mainland mutualism rates on species richness of oceanic islands?

In island biogeography, it is widely accepted that species richness on island depends on the area and isolation of the island as well as the species pool on the mainland. Delavaux et al. (2024) sugges...

arxiv.org

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Florian Hartig @florianhartig.bsky.social · Nov 24

Well, I've heard it said that great minds think alike ... ;)

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Florian Hartig @florianhartig.bsky.social · Nov 21

It may be time for a starter pack of ecology starter packs ...

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Florian Hartig @florianhartig.bsky.social · Nov 21

Our study "Analyzing longitudinal trait trajectories using #GWAS identifies genetic variants for kidney function decline" led by Simon Wiegrebe and Iris Heid just published via www.nature.com/articles/s41...

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Florian Hartig @florianhartig.bsky.social · Nov 17

On my way back from a short visit at Uni Birmingham! Thanks Juliano Sarmento Cabral for inviting me!

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Florian Hartig @florianhartig.bsky.social · Nov 8

Our preprint "Calibration, sensitivity and uncertainty analysis of ecological models -- a review" with Anne Malchow now available at doi.org/10.22541/au.... Comments welcome!

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Florian Hartig @florianhartig.bsky.social · Oct 29

DHARMa v0.4.7 #rstats package for #glmm residual diagnostics now available on #CRAN. Among other things, this version includes a new residual test for #phylogenetic correlation, as well as support for the #phylolm package. cran.r-project.org/web/packages...

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Macroecology lab @unipotsdam @zurelllab.bsky.social · Apr 17

New paper on spatiotemporal population dynamics of #RedKite in Switzerland. We inversely fitted #RangeShifter to long-term monitoring data. This hugely reduced prediction #uncertainty. esajournals.onlinelibrary.wiley.com/doi/10.1002/... 1/n

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Maximilian Pichler @maximilianpichler.bsky.social · Apr 11

cito v1.1 #rstats package for deep neural networks (#DL #DNN) (with formula syntax) is now available on #CRAN. New features include likelihoods such as the negative binomial distribution and easy hyperparameter tuning: cran.r-project.org/web/packages...

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Florian Hartig @florianhartig.bsky.social · Feb 28

Our study "Latitudinal patterns in stabilizing density dependence of forest communities" now out in nature.com/articles/s41... . See also tread by first author @lisahuelsmann.bsky.social below

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Florian Hartig @florianhartig.bsky.social · Dec 13

Our new preprint "Environmental DNA captures the internal structure of a pond metacommunity" led by Wang Cai with Maximilian Pichler, Jeremy Biggs, Pascale Nicolet, Naomi Ewald, Richard A. Griffiths, Alex Bush, Mathew A. Leibold, Florian Hartig, Douglas W. Yu www.biorxiv.org/content/10.1...

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Florian Hartig @florianhartig.bsky.social · Dec 11

Rockström et al. 2009 write e.g. "Many subsystems of Earth react in a nonlinear, often abrupt, way, and are particularly sensitive around threshold levels of certain key variables. If these thresholds are crossed, then [...] deleterious or potentially even disastrous consequences for humans"

Florian Hartig @florianhartig.bsky.social · Dec 11

I had always assumed that this is intentional and aims at visualising that "something bad" is going to happen if we transgress the boundary (i.e. societal costs increase nonlinear with the axis displayed here). However, not sure how explicit this was made in the various boundary papers.

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Florian Hartig @florianhartig.bsky.social · Nov 24

For more info on DHARMa, see here cran.r-project.org/package=DHARMa . For more info on our lab, see here uni-regensburg.de/biologie-vor... . A first assessment of applications will be on Dec. 12th, but applications will be considered until the position is filled!