David García Callejas
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callejas.bsky.social
David García Callejas
@callejas.bsky.social
1.1K followers 440 following 22 posts
Community ecologist working at University of Graz (Austria) and the CSIC Center for Advanced Studies (Blanes, Spain)
Posts Replies Media Videos
Reposted by David García Callejas
hansonmark.bsky.social
We wrote the Strain on scientific publishing to highlight the problems of time & trust. With a fantastic group of co-authors, we present The Drain of Scientific Publishing:

a 🧵 1/n

Drain: arxiv.org/abs/2511.04820
Strain: direct.mit.edu/qss/article/...
Oligopoly: direct.mit.edu/qss/article/...
A table showing profit margins of major publishers. A snippet of text related to this table is below. 1. The four-fold drain 1.1 Money Currently, academic publishing is dominated by profit-oriented, multinational companies for whom scientific knowledge is a commodity to be sold back to the academic community who created it. The dominant four are Elsevier, Springer Nature, Wiley and Taylor & Francis, which collectively generated over US$7.1 billion in revenue from journal publishing in 2024 alone, and over US$12 billion in profits between 2019 and 2024 (Table 1A). Their profit margins have always been over 30% in the last five years, and for the largest publisher (Elsevier) always over 37%. Against many comparators, across many sectors, scientific publishing is one of the most consistently profitable industries (Table S1). These financial arrangements make a substantial difference to science budgets. In 2024, 46% of Elsevier revenues and 53% of Taylor & Francis revenues were generated in North America, meaning that North American researchers were charged over US$2.27 billion by just two for-profit publishers. The Canadian research councils and the US National Science Foundation were allocated US$9.3 billion in that year. A figure detailing the drain on researcher time. 1. The four-fold drain 1.2 Time The number of papers published each year is growing faster than the scientific workforce, with the number of papers per researcher almost doubling between 1996 and 2022 (Figure 1A). This reflects the fact that publishers’ commercial desire to publish (sell) more material has aligned well with the competitive prestige culture in which publications help secure jobs, grants, promotions, and awards. To the extent that this growth is driven by a pressure for profit, rather than scholarly imperatives, it distorts the way researchers spend their time. The publishing system depends on unpaid reviewer labour, estimated to be over 130 million unpaid hours annually in 2020 alone (9). Researchers have complained about the demands of peer-review for decades, but the scale of the problem is now worse, with editors reporting widespread difficulties recruiting reviewers. The growth in publications involves not only the authors’ time, but that of academic editors and reviewers who are dealing with so many review demands. Even more seriously, the imperative to produce ever more articles reshapes the nature of scientific inquiry. Evidence across multiple fields shows that more papers result in ‘ossification’, not new ideas (10). It may seem paradoxical that more papers can slow progress until one considers how it affects researchers’ time. While rewards remain tied to volume, prestige, and impact of publications, researchers will be nudged away from riskier, local, interdisciplinary, and long-term work. The result is a treadmill of constant activity with limited progress whereas core scholarly practices – such as reading, reflecting and engaging with others’ contributions – is de-prioritized. What looks like productivity often masks intellectual exhaustion built on a demoralizing, narrowing scientific vision. A table of profit margins across industries. The section of text related to this table is below: 1. The four-fold drain 1.1 Money Currently, academic publishing is dominated by profit-oriented, multinational companies for whom scientific knowledge is a commodity to be sold back to the academic community who created it. The dominant four are Elsevier, Springer Nature, Wiley and Taylor & Francis, which collectively generated over US$7.1 billion in revenue from journal publishing in 2024 alone, and over US$12 billion in profits between 2019 and 2024 (Table 1A). Their profit margins have always been over 30% in the last five years, and for the largest publisher (Elsevier) always over 37%. Against many comparators, across many sectors, scientific publishing is one of the most consistently profitable industries (Table S1). These financial arrangements make a substantial difference to science budgets. In 2024, 46% of Elsevier revenues and 53% of Taylor & Francis revenues were generated in North America, meaning that North American researchers were charged over US$2.27 billion by just two for-profit publishers. The Canadian research councils and the US National Science Foundation were allocated US$9.3 billion in that year. The costs of inaction are plain: wasted public funds, lost researcher time, compromised scientific integrity and eroded public trust. Today, the system rewards commercial publishers first, and science second. Without bold action from the funders we risk continuing to pour resources into a system that prioritizes profit over the advancement of scientific knowledge.
November 11, 2025 at 11:52 AM
Reposted by David García Callejas
esajournals.bsky.social
🆕 in "Ecological Monographs": Static models miss the mark—adding nonlinear, density-based facilitation helps predict coexistence, persistence, and realistic community dynamics

📄Neighbor density-dependent facilitation promotes coexistence and internal oscillation
doi.org/10.1002/ecm....
Schematic illustrating how species interactions can depend on neighborhood density and identity.
November 10, 2025 at 7:45 PM
Reposted by David García Callejas
ricardsole.bsky.social
What is the origin of diversity in allometric laws scaling across species? Check our new paper led by Andrea Tabi where
we propose a new theory of metabolic scaling grounded in thermodynamics and stochastic fluctuations at the cellular level.
www.biorxiv.org/content/10.1...
November 9, 2025 at 2:39 AM
Reposted by David García Callejas
danimontoya.bsky.social
I am pleased to announce a new postdoctoral position in Theoretical Ecology. More info here: info.bc3research.org/2025/11/06/p...
Postdoctoral position in agroecology for TRANSFORM Project
The Basque Centre for Climate Change (BC3) is offering a full-time postdoctoral research position to support activities within a Horizon Europe project. The project focuses on developing innovative cr...
info.bc3research.org
November 6, 2025 at 3:40 PM
Reposted by David García Callejas
saramaranonjimenez.bsky.social
⛰️Aún estas a tiempo de contactar para hacer tu #doctorado en cambio climático y suelos de montaña en el CREAF🌳! Anímate a solicitar ayudas FPU/FI en el proyecto DRYLAND (MICIU). Efectos sequía en las pérdidas de C y nutrientes en suelos de alta montaña. Solicita aquí!-> sl1nk.com/fnIEG
saramaranonjimenez.bsky.social Sara Marañón Jiménez @saramaranonjimenez.bsky.social · Sep 30
🌱🏔️ ¿Quieres hacer tu #doctorado en cambio climático y suelos de montaña?
Buscamos candidato/a para solicitar ayudas FPI/FPU/FI vinculadas al proyecto DRYLAND (MICIU).
Tema: efectos de la sequía en las pérdidas de C y nutrientes en suelos de alta montaña.
📍 @creaf.cat (Barcelona)
October 31, 2025 at 12:36 PM
Reposted by David García Callejas
cs3conference.bsky.social
¡Continuamos con nuestros conferenciantes invitados!
En la 4º reunión de la Sociedad Española de Sistemas Complejos tendremos el placer de contar con
Maria Paniw, EBD-CSIC
@paniw.bsky.social

🚨 ¡Envía tu abstract hasta el 1 de noviembre!
🌐 cs3.es/conference-2026
October 31, 2025 at 8:53 AM
Reposted by David García Callejas
ferransayol.bsky.social
PhD offer on island extinctions. Last week to apply! 👇🏼
ferransayol.bsky.social Ferran Sayol @ferransayol.bsky.social · Sep 25
🚨PhD offer 👩‍🎓:
Fascinated by island biodiversity, palaeoecology & human impacts on ecosystems? 🌴🦜🌍 Join @creaf.cat to explore how island life changed over the last 11,700 years.
Deadline: 27 Oct 2025
Selection: ~November
Starting: ~January 2026
Supervision: @sandranogue.bsky.social & me
More info👇
October 20, 2025 at 7:25 PM
Reposted by David García Callejas
eco-aeet.bsky.social
🚨 III Jornadas de Investigadores e investigadoras ECRs en Ecología de la AEET.

Se está comenzando la planificación de la tercera edición de estas jornadas, y se necesita gente que quiera implicarse. Por favor, si estás interesado, contesta a este cuestionario:

docs.google.com/forms/d/e/1F...
October 17, 2025 at 7:47 AM
Reposted by David García Callejas
bioeaf.bsky.social
Aprovecho para decir que estas ayudas son de las pocas maneras que tenemos los investigadores "jovenes" de dirigir proyectos aunque luego se nos vaya a penalizar en las evaluaciones por no haberlo hecho
eco-aeet.bsky.social Asociación Española de Ecología Terrestre - AEET @eco-aeet.bsky.social · Oct 16
#ProyectosAEET
Ya se ha resuelto la convocatoria 2025 de las ayudas a proyectos de investigación en Ecología @eco-aeet.bsky.social + @sibecol.bsky.social + Asociación Ibérica de Limnología

www.aeet.org/es/convocato...
October 16, 2025 at 9:54 AM
Reposted by David García Callejas
ecosistemas-aeet.bsky.social
¿Cómo se encuentra actualmente la investigación y gestión de especies exóticas invasoras (EEI) en España? Lejos de mitigarse, el problema de las EEI no deja de agravarse. Castro-Díez et al. analizan en profundidad los avances realizados en España en este ámbito durante la última década.
October 16, 2025 at 10:45 AM
Reposted by David García Callejas
edgarstraehle.bsky.social
El gran David Graeber falleció un día como hoy hace 5 años.

Aquí un hilo con algunos de los fragmentos más interesantes de sus muy inspiradoras obras.

1. Este pasaje fundamental suyo sobre la condición laboral contemporánea.
September 2, 2025 at 3:55 PM
Reposted by David García Callejas
adamtclark.bsky.social
How can we identify #coexistence in #ecology? There are at least three common approaches (structural stability, eigenvalues, and invasion), and each investigates different aspects of community dynamics (equilibria, locally stable equilibria, and global stability). 1/2
A practical guide to characterising ecological coexistence
Coexistence is simultaneously one of the most fundamental concepts of ecology, and one of the most difficult to define. A particular challenge is that, despite a well-developed body of research, seve...
onlinelibrary.wiley.com
October 14, 2025 at 10:53 AM
Reposted by David García Callejas
emiliodelgado.bsky.social
El científico del CSIC Emilio Santiago Muiño poniendo a Vox en su sitio ayer en el congreso.
October 10, 2025 at 10:56 AM
Reposted by David García Callejas
ecoinf-aeet.bsky.social
¡Hola, ecoinformáticxs! 🌍💻 ¿Os gusta hacer mapas? ¿Y si os decimos que podemos unirnos para un reto divertido y colaborativo? Si estás leyendo esto, ¡TE QUEREMOS! ❤️¡Atentos, que esto mola! 👇
October 8, 2025 at 9:31 AM
Reposted by David García Callejas
ibartomeus.bsky.social
We are offering a 2-year postdoctoral position to join the @valor-project.eu Horizon EU project: Values and dependence of society on pollinators bartomeuslab.com/joining-the-...
Joining the lab
2-year Postdoctoral position on VALOR EU-project: We are offering a 2-year postdoctoral position to join the Horizon EU project: Values and dependence of society on pollinators (VALOR; The candidat…
bartomeuslab.com
October 6, 2025 at 1:31 PM
Reposted by David García Callejas
eco-aeet.bsky.social
Desde el Gobierno de España se habilitado una consulta abierta a la ciudadanía sobre los puntos principales a incluir en un futuro Pacto de Estado frente a la Emergencia Climática.

Enlace a la consulta (abierta hasta el 15 de octubre):
forma.administracionelectronica.gob.es/form/open/co...
October 2, 2025 at 2:18 PM
Reposted by David García Callejas
domgarvir.bsky.social
I’ll be teaching “Introduction to Network Analysis & Modelling” – theory, hands-on with Python, applications to real systems. Starts Sept 22 with @tscourses.bsky.social
You sitll have time to register →
www.transmittingscience.com/courses/syst...
Network Analysis Course for Diverse Disciplines
Join our Live Online Course to explore Network Analysis and gain insights into understanding complex systems through networks.
www.transmittingscience.com
September 16, 2025 at 7:37 AM
Reposted by David García Callejas
naomiaklein.bsky.social
A bunch of folks have asked about my "Long Arc of Fascism" course - this is my opening lecture at our public teach-in last Spring.
ccj-ubc.bsky.social Centre for Climate Justice @ccj-ubc.bsky.social · Sep 10
Watch @naomiaklein.bsky.social open the Long Arc of Fascism teach-in by challenging the conventional, narrow understanding of fascism, particularly the idea that it is a uniquely European phenomenon that began in the 1920s or ’30s and was defeated in 1945.
@ccms-sfu.bsky.social
Introduction Sketching Fascism’s Long Arc with Naomi Klein
YouTube video by Centre for Climate Justice
www.youtube.com
September 11, 2025 at 5:48 AM
Reposted by David García Callejas
paniw.bsky.social
What do this👇 lovely plant, lemur, and petrel have in common? They have populations where individuals were monitored for decades - and now provide amazing resources to compare complex responses of populations to threats. So, go beyond “it’s context dependent” to find common patterns.
September 9, 2025 at 7:59 AM
Reposted by David García Callejas
volkerrudolf.bsky.social
How variable are temperature effects on species interactions within a local community? Find out in our new paper led by @zoeyneale.bsky.social
"Thermal responses of feeding rates differ across co‐occurring predator species" esajournals.onlinelibrary.wiley.com/doi/full/10....
September 8, 2025 at 2:25 PM
Reposted by David García Callejas
callejas.bsky.social
Aotearoa New Zealand is incredibly beautiful and its biodiversity is mindblowing, a treasure to conserve, restore, and also to study! In this setting, we (Jason, Sandra, Duane, Otso and I) analysed how species of birds and plants connect ecosystems across the country 👇

rdcu.be/eCHVk
Species traits and landscape structure can drive scale-dependent propagation of effects in ecosystems - Nature Communications
Ecological effects, such as disturbances, have a spatial dimension, but what influences their spatial propagation is not fully understood. Here, the authors find generalist and widespread species are ...
doi.org
August 27, 2025 at 2:13 PM
Reposted by David García Callejas
gonzalotorne.bsky.social
Qué bonita y precisa es la definición de felicidad de Diógenes, el cínico: "Una alegría serena y constante".
August 28, 2025 at 4:20 PM
callejas.bsky.social
Aotearoa New Zealand is incredibly beautiful and its biodiversity is mindblowing, a treasure to conserve, restore, and also to study! In this setting, we (Jason, Sandra, Duane, Otso and I) analysed how species of birds and plants connect ecosystems across the country 👇

rdcu.be/eCHVk
Species traits and landscape structure can drive scale-dependent propagation of effects in ecosystems - Nature Communications
Ecological effects, such as disturbances, have a spatial dimension, but what influences their spatial propagation is not fully understood. Here, the authors find generalist and widespread species are ...
doi.org
August 27, 2025 at 2:13 PM
Reposted by David García Callejas
jasonhickel.bsky.social
Imperialism and racism are central to the capitalist world economy. The barbarism is a feature, not a bug.
August 26, 2025 at 8:14 PM
Reposted by David García Callejas
ecoinvasions.bsky.social
Legendary ecologist.

"Jim Estes showed the world that the absence of a creature as unassuming as a sea otter could transform entire coastlines. In doing so, he reminded policymakers, scientists, and the public that human choices ripple outward in ways often unseen."
August 24, 2025 at 5:23 PM