Oskar Hagen, PhD, Biodiversity, Research, Science, Biology, Evolution, Ecology, Macroevolution, Macroecology, Conservation Biology, Computational Biology, Theoretical Biology, Informatics, mechanistic model, modeling, Fireflies, vagalume, Photopollution, Lightpollution, Hermetia, TreeSimGM, GaSM, ETHZ, WSL, UFSCar, Brazil, Switzerland, Hagen, Oskar.


Diga Verzasca vertigo [more]
07:02 PM - 18 Aug, 2018
[FW] PhD level Research Scientist position available @Stanford_ChEMH with a focus on Virology. Please RT. #sciencejobs #virology #research @StanfordBiosci @StanfordMed @AmerSocVirol @BayAreaPostdocs [more]
04:05 PM - 16 Aug, 2018
“Random number generation is too important to be left to chance.” Robert R. Coveyou
02:18 PM - 16 Aug, 2018
Great context and unknown fact: “Brazil remains one of the most dangerous places to be an environmental defender” 😢 [more]
09:10 PM - 15 Aug, 2018
Coding is art! Do you have R? Run this: x <- y <- seq(-4*pi, 4*pi, len = 40) r <- sqrt(outer(x^2, y^2, "+")) for (c in seq(1,20,0.1)) { filled.contour(cos(r^c)*exp(-r/(4.4*pi)),axes=F,color.palette=heat.colors,asp=1, main="#streetparade") Sys.sleep(0.1) }
03:29 PM - 10 Aug, 2018
[FW] Throwback to fieldwork moments in Mayotte (Comoros Archipelago) @CamilleAlbouy @hagen_oskar. Morning calibration of the stereo-camera system before taking 3D measurements of reef fish body shapes across different habitats. #Morphometrics #VidSync @TroutnutDotCom #Seacam [more]
03:19 PM - 10 Aug, 2018
[FW] This pterosaur deserves its own fan club [more]
11:12 PM - 9 Aug, 2018
[RE] @o_eco Está olhando pro lado errado da rua pequeno!
01:55 PM - 9 Aug, 2018
[FW] If you're interested in using the complete ("all-taxon assembled") phylogenies from our recent paper on a latitudinal gradient in fishes, we've updated that set of trees to make them look quite a bit nicer. The improvements are documented on the website: [more]
07:22 PM - 8 Aug, 2018
Paper almost as old as I am. :) Hard substrate communities through the Phanerozoic. #365papers [more]
11:44 AM - 6 Aug, 2018
“spatial context of diversification can provide new insights into the role of ecological limits in driving variation in biodiversity across space, time and clades” [more]
09:25 AM - 1 Aug, 2018
[FW] Open #PhD position in population genetics of tropical reef fishes 🐠 and spatial #biodiversity models [more]
02:18 AM - 1 Aug, 2018
[FW] Ist eine Hochzeit so wichtig, dass man die Umwelt mit einem Flug von Zürich nach Brasilien so massiv belasten darf? Eine Suche nach Antworten von @ConradinZ: [more] [more]
11:51 PM - 30 Jul, 2018
[FW] The smell of the air after a storm is caused by Geosmin: A chemical released by dead soil bacteria. Humans are hyper sensitive to it, capable of detecting at a concentration of 5 parts per trillion. It's theorised in our evolutionary past this helped us seek out water.☔️⛈️
11:46 PM - 30 Jul, 2018
[FW] "The science was poor, but the claims were intriguing. Many journalists gave up the chance to vet information so as not to be late to the story." [more] That basically sums it up: the issue here isn't pre-prints, the issue is a lack of journalistic integrity.
11:43 PM - 30 Jul, 2018
[FW] We have watched Tom drink water out of a pencil holder, and attempt to eat off of our frisbee (we stopped him because we wanted to use it). The point is, no excuses! We have too much #plastic trash. #Reduce and #reuse. #Recycling just isn't enough anymore. [more]
11:42 PM - 30 Jul, 2018
[FW] Enjoy the lunar eclipse tonight, Flat Earthers! [more]
05:22 AM - 28 Jul, 2018
Right on time, while I struggle with GaSM dispersal kernel. How dispersal and environmental heterogeneity influence observed and simulated biodiversity patterns. [more] #365papers
03:28 PM - 26 Jul, 2018
How predictable is evolution? Interesting science blog (resume) of publication. [more]
08:25 AM - 26 Jul, 2018
[FW] Can't wait for this to happen! In only 250 million years our continents will have merged into a single super-continent "Pangaea Proxima". Look at the cute Atlantic! The Himalaya won't be the highest mountain range anymore! Source: [more] [more]
09:43 AM - 24 Jul, 2018
[RE] @tf_rangel @sciencemagazine Great video!!! :)
03:20 PM - 23 Jul, 2018
[FW] Modeling the ecology and evolution of biodiversity: Biogeographical cradles, museums, and graves - Science Magazine [more]
03:05 PM - 23 Jul, 2018
What do we call dispersal and dispersion in ecology? I thought it was a language barrier... interesting 70's point of view. [more]
10:30 AM - 23 Jul, 2018
[RE] @Noguesbravo @Rui_FFF Great study!
02:06 AM - 21 Jul, 2018
Interesting read (at least the very tiny bit I put my eyes on) of William Ophuls “Platus revenge, politics in the age of ecology”. He considers computational models of complex systems as scientific pices of art and not as mathematical demonstrations.
05:45 PM - 19 Jul, 2018


Oskar Hagen

PhD candidate in Environmental Sciences at WSL and ETH Zürich

Areas of Expertise: Environmental Sciences, Conservation Biology and Informatics

Interests: I’m a Swiss-Brazilian citizen with a family divided by the Atlantic, born in Venezuela and raised in the countryside of Brazil. This background suits the nature of my interdisciplinary interests, which also forged an unusual career path. I first studied informatics in a 2 year formal technical education, then I graduated in Conservation Biology in Brazil. Later, I came to Switzerland and pursued my Master in Environmental Sciences at ETH. My master thesis was conducted at the theoretical biology group, with major in Ecology and Evolution at the department of integrative biology. After the Master’s I left Switzerland and worked on public and private sectors. Now I am back in the land as a PhD candidate in landscape ecology.

During my bachelor at UFSCar I collaborated with several research groups and gained experience on teaching, field work, data analysis and population dynamics modelling. At that point, I investigated and quantified the effects of artificial illumination at firefly’s populations. I proposed fireflies as potential flagship species and bioindicators for artificial ilumination once they can be easily spotted at night and are charismatic (a rare characteristic among insects). While monitoring firefly populations in Atlantic rain forests over the years I felt in love with these lightning bugs and became engaged in communicating and tackling Photopollution.

Throughout my Master`s at ETH, I enhanced my mathematical and modelling skills, specifically regarding speciation and extinction processes. We proposed a generalized model and evaluated the effects of different extinction and speciation processes on phylogenetic trees shape, trying to better understand macroevolutionary processes. Our results suggested an age-dependent speciation, and we also briefly discussed motivations and plausible biological implications of our findings. This research project developed to other scientific collaborations towards extinction processes from a conservation and macroevolutionary/paleontological perspective. Yielding a few publications, an R-package TreeSimGM (simulates phylogenies) and the expansion of the software PyRate (estimates macroevolutionary rates from fossil data using a Bayesian framework). These projects strengthened my interest in better understanding biodiversity dynamics and consolidated my interest towards applied ecology and computational biology (still in love with the fireflies though!).

Away from academia, I conducted an internship at the forestry department of the Federal Office for the Environment in Switzerland (BAFU) and worked as a consultant in a conservation project in Laos. The project targeted the implementation of SN-REDD in two national protected areas in the South and was the first public-private partnership in the country. Early 2015 I dove into an insect farm start-up project in Brazil, which is still operational with my partial involvement. Our plans are to reduce waste from other industrial sectors while providing organic fertilizer and alternative protein sources to fish and chicken production. I dream of a more sustainable and environmentally friendly animal feed production in comparison to the current soya and overexploited fishmeal production systems.

Licenses: Car and motorbike (international license); scuba diving (PADI advanced open water).

Hobbies: Photographing, observing nature (e.g. landscapes, wildlife and human beings), playing ukulele, painting/drawing, handcrafting and exploring new technologies.

Current Research

Currently I investigate the role of past environmental conditions and eco-evolutionary feedbacks in shaping biodiversity gradients. For this, I am developing a macroevolutionary computational mechanistic model called GaSM (stands for General Allele Simulation Model) in order to infer biodiversity patterns from historical environmental dynamics and better understand ecological and evolutionar (i.e. speciation and extinction) processes. With GaSM it is possible, for the first time, to test and create new hypothesis under a general framework (i.e. acting mutually at evolutionary and ecological temporal resolution) and quantify processes shaping the biodiversity patterns we observe today. For that I must additionaly compile and recreate paleoenvirolmental conditions as well as obtain empirical species distribution, traits and evolutionary histories. Ultimately, GaSM will inform on the ecosystem responses to global changes, and especially the loss of diversification potential for biodiversity. This may challenge current conservation practice, and move current concepts toward an increased focus on the conservation of evolutionary potential.


Portuguesemother tongue






Formal Education

07.2016 Now

PhD candidate in Environmental Sciences: Landscape Ecology

Swiss Federal Institute for Forest, Snow and Landscape Research, WSL, Switzerland
Swiss Federal Institute of Technology Zürich, ETH, Switzerland

  • Advisor: Prof. Dr. Loïc Pellissier

09.2010 09.2013

Master in Environmental Sciences: Ecology and Evolution

Swiss Federal Institute of Technology Zurich, ETH, Switzerland

03.2006 12.2009

Bachelor in Biology: Conservation Biology

Federal University of São Carlos - campus Sorocaba, UFSCAR, Brazil

01.2005 12.2007

Vocational and Technical Education: Informatics – Communications Networking

SENAI Swiss-Brazilian - Regional Department of São Paulo, SENAI/DR/SP, Brazil

Complementary Formation

03.2010 08.2010

Obligatory Swiss Military Service

Schweizer Armee

  • Function: ABC Korporal
  • Defense of Atomic, Biological and Chemical weapons and formation as Sub-official

01.1999 06.2004

Classical Guitar, Rhythmic and Musical theory

Municipal Music School of Porto Feliz, EMM, Brazil


L Pellissier, P Descombes, O Hagen, L Chalmandrier, G Glauser, A Kergunteuil, E Defossez, S Rasmann (2018) Growth-competition-herbivore resistance trade-offs and the responses of alpine plant communities to climate change. Functional Ecology

O Hagen, T Andermann, TB Quental, A Antonelli, D Silvestro (2017) Estimating age-dependent extinction: contrasting evidence from fossils and phylogenies. Systematic Biology

EO Hagen, O Hagen, JD Ibáñez-Álamo, OL Petchey, KL Evans (2017) Impacts of urban areas and their characteristics on avian functional diversity. Frontiers in Ecology and Evolution

O Hagen, T Stadler (2017) TreeSimGM: Simulating phylogenetic trees under general Bellman-Harris models with lineage-specific shifts of speciation and extinction in R. Methods in Ecology and Evolution

O Hagen, K Hartmann, M Steel, T Stadler (2015) Age-dependent speciation can explain the shape of empirical phylogenies. Systematic Biology

O Hagen, RM Santos, MN Schlindwein, VR Viviani (2015) Artificial night lighting reduces firefly (Coleoptera: Lampyridae) occurrence in Sorocaba, Brazil. Advances in Entomology

VR Viviani, MY Rocha, O Hagen (2010) Bioluminescent beetles (Coleoptera: Elateroidea: Lampyridae, Phengodidae, Elateridae) in the municipalities of Campinas, Sorocaba-Votorantim and Rio Claro-Limeira (SP, Brazil): biodiversity and influence of urban sprawl. Biota Neotropica

Extracurricular Activities

02.2018 Now

Reviewer of journal Global Change Biology

06.2017 Now

05.2014 Now

Reviewer of journal Methods in Ecology and Evolution

10.2007 12.2009

Director and Founder of Academic Journal (Jornal OCASO)

Federal University of São Carlos - campus Sorocaba, UFSCAR, Brazil

  • Under the guidance of Prof. Dr. Monica Caron

05.2006 12.2009

Director of information at the Academic Center

Federal University of São Carlos - campus Sorocaba, UFSCAR, Brazil


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Above and Below Laos 2014

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Rock and Ice Heart Switzerland 2012

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Tarzan and Jane Portugal 2016

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The in and out side Zambia 2013

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Brown Laos 2014

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Rainbow Switzerland 2013

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Red Laos 2013

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Berg Dragonsaur Switzerland 2018

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Calm Forest Laos 2013

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Climby Switzerland 2017

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Float Laos 2013

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Lost and Found Tanzania 2017

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Small is Beautiful Brazil 2015

ORCID iD icon 0000-0002-7931-6571 TwitterOskarHagen@hagen_oskar e-mailOskarHagen oskar@hagen.bio