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.


Enhancing host DNA on feces (dominated by non host, i.e. bacteria genetic material). Interesting features sketched on monkey feces. Zoom all in Fig 1 for entertaining details. [more] #whysoserious
04:09 PM - 14 Dec, 2018
Joining different processes into one new birth-death chronospecies model😍1)Reduces the gap between phylogenies and fossil data 2)Brings us closer to unify macroevolution 3)Helps on how different groups were shaped by competing macroeolutionary processes? [more] [more]
07:11 PM - 8 Dec, 2018
Well done Dr. Horgan! Great to see values and social issues coming back to environmental sciences in a super holistic topic @RangerNutkin @UZH_Science @OwenPetchey [more]
04:16 PM - 7 Dec, 2018
[RE] @cndesantana @rOpenSci @MethodsEcolEvol @msciain @jhollist @LauraJaneGraham Really needed! ❤️
11:16 AM - 1 Dec, 2018
How did life stage though space and time? Looking forward to present @EawagResearch my model and talk about using computers to play the theatre of life. [more]
05:54 PM - 20 Nov, 2018
[RE] @avalonceleste @IDADarkSky @ZooLighter @TuftsUniversity @TuftsBUGS @MassAudubon @xercessociety Congratulations! Great work and overview. Keep it up
02:28 PM - 26 Oct, 2018
sDiv @idiv has opened a new call for Working Groups, Individual Postdocs and Sabbaticals! [more]
02:18 PM - 26 Oct, 2018
Impressed with @cooperacre - A Brazil Nut industry in the Amazon region beating logistics in the tropical forest while developing a responsible industry in social, economic and environmental aspects. Sustainable development is possible! [more]
02:20 AM - 10 Oct, 2018
Finally meeting #BR364 What does this road means to acre state, the forest and it’s people? Old but worth reading article [Could environmentalists learn to love this road?] [more] [more]
02:46 AM - 7 Oct, 2018
There are many tiny worlds out there. Memorial world #WashingtonDC [more]
02:26 AM - 3 Oct, 2018
[FW] [more]
02:16 AM - 3 Oct, 2018
[RE] @SapygaFr @ElenaHaeler @LE_group_ETHWSL ☺️🕺🤖
02:11 AM - 28 Sep, 2018
[FW] When you use a 10 layer Deep Neural Network where Logistic Regression would suffice [more]
11:39 AM - 27 Sep, 2018
[RE] @SapygaFr @ElenaHaeler @LE_group_ETHWSL There would be too many discrete timesteps. Just imagine ... [more]
08:09 PM - 26 Sep, 2018
[FW] Discussing Biodiversity Synthesis Center in Brazil: a needed and urgent facility. Follow the discussion in live [more] @ieausp @sMarten_Winter @AlisonSpecht @BiotaFAPESP @BPBES_oficial @imavieira @tf_rangel [more]
05:36 PM - 25 Sep, 2018
[FW] #Extinction on #islands in evolutionary unique species: is it the result of time (since speciation)? Or does the species belong to a 'vulnerable' lineage with high (historical) extinction rates? Warren et al. @Darwin2009 give the answer: [more] [more]
06:23 PM - 24 Sep, 2018
[RE] @ecojydrology @aglHurley Welcome! Let me know if this hacked. ;)
06:23 PM - 24 Sep, 2018
[RE] @ecojydrology simple trick should work if you set memory.limit(DESIREDMEMORY) along suggestions by @aglHurley . R will use your system page file. Not fast but should be OK if you have a nice ssd. First check your memory usage with memory.limit()
04:20 PM - 24 Sep, 2018
If you are using the updated raster package (version 2.6-7) for creating buffers on rasters.. be aware of a bug and go around it by: rasterOptions(todisk=TRUE) braster<- buffer(raster, width=y) rasterOptions(todisk=FALSE) Thanks @fabian_fopp
04:10 PM - 24 Sep, 2018
[FW] These images show species that are so endangered that all remaining members can fit into a single subway carriage. Source: [more] [more]
08:11 AM - 21 Sep, 2018
[FW] @iochromaland I am recruiting PhD students/postdoc interested in the evolutionary ecology/genomics of adaptive radiation in Caribbean pupfishes / Cameroon crater lake cichlids 🐟😍🐟🐠🐡🐟 I'm open to developing other new fish systems as well!
04:21 PM - 18 Sep, 2018
[FW] Help the National Museum of Brazil rebuild - donate specimens! If your institution has material that it is willing to donate, please upload formal letters that describe the material to: [more] [more]
04:20 PM - 18 Sep, 2018
[RE] @ASNAmNat First read “sympathetic parasites”. 👀 early in the morning...
07:48 AM - 18 Sep, 2018
[FW] Open PhD position in Macroecology/Palaeoecology – University of Bergen, with me and @JAGrytnes! Deadline Sept 28, thanks @Biogeography ! [more]
07:44 AM - 18 Sep, 2018
[FW] Boss @tbquental kicking off our grad course on macroevolution at the University of Sao Paulo - with @gustavoburin [more]
07:42 AM - 18 Sep, 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


BH Warren, O Hagen, F Gerber, C Thébaud, E Paradis, E Conti (2018) Evaluating alternative explanations for an association of extinction risk and evolutionary uniqueness in multiple insular lineages. Evolution

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

08.2018 Now

Reviewer of journal Ecography

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