Transient phenomena in ecology

Just published in Science: a collaboration with Alan Hastings and leading scientists from Canada, the US and UK, looks at the importance of transient dynamics in ecological systems. The work comes out of an ongoing NIMBioS (National Institute for Mathematical and Biological Synthesis) working group. Transient phenomena in ecology Hastings, Abbott, Cuddington, Francis, Gellner, Lai, Morozov,…

Inverted Trophic Pyramids & Top-Heavy Communities: new research

New research I worked on with UC Santa Barbara’s Douglas McCauley and several colleagues is published in Ecology Letters and is now available online. On the prevalence and dynamics of inverted trophic pyramids and otherwise top-heavy communities McCauley, D.J., G. Gellner, N.D. Martinez, R.J. Williams, S.A. Sandin, F. Micheli, P.J. Mumby, and K.S. McCann Abstract Classically, biomass partitioning…

Dead stuff & the Brown food chain

Detritus Matters!  Here’s a great Ted Ed lesson about the role of detritus in food webs from CSU professor John C. Moore. In addition to a special issue on the theory of food webs in Theoretical Ecology, scholars at the latest Food Web Symposium in Giessen, Germany (2013) made efforts to disseminate our food web research…

Critical Impacts Detected

Early warning signals detect critical impacts of experimental warming. New research with UofG colleagues is published the open access journal Ecology and Evolution. Very exciting! Early warning signals detect critical impacts of experimental warming  Lauren Jarvis, Kevin McCann, Tyler Tunney, Gabriel Gellner, John M Fryxell Abstract Earth’s surface temperatures are projected to increase by ~1–4°C over the…

A Stochastic Theory of Species Interactions

My research with Kevin McCann (U of Guelph) and Alan Hastings (UC Davis) on a stochastic theory of species interactions has been published in Theoretical Ecology and is available online. The Duality of Stability: Towards a Stochastic Theory of Species Interactions G. Gellner, K.S. McCann, A. Hastings Abstract Understanding the dynamics of ecological systems using stability…

Consistent Interaction Role in Food Webs

Very excited that my research has been published in Nature Communications: 7, 11180 (12 April 2016) Consistent role of weak and strong interactions in high- and low-diversity trophic food webs Gellner, G. and KS McCann Abstract The growing realization of a looming biodiversity crisis has inspired considerable progress in the quest to link biodiversity, structure…

Food Webs & Fisheries

Exciting news: our paper “Food webs and the sustainability of indiscriminate fisheries” in the Canadian Journal of Fisheries and Aquatic Sciences is published and available online.

Hastings and Powell: 3 Ways

Here I use three computer programming languages to see how they compare in reproducing Hastings & Powell’s important findings from an early paper.

Grasslands Diversity Loss

A project I worked on with Andrew MacDougall, based at the University of Guelph, was the cover article published in Nature: 494, 86-89 (February 2013). Diversity loss with persistent human disturbance increases vulnerability to ecosystem collapse A.S. MacDougall, K.S. McCann, G. Gellner, R. Turkington Abstract Long-term and persistent human disturbances have simultaneously altered the stability and diversity…

Teaching in Sao Paolo, Brazil

Thank you to the International Centre for Theoretical Physics and the South American Institute for Fundamental Research for inviting me to co-teach a course on advanced foodweb theory in 2012. The ICTP SAIFR describes Energetic Approach to Food Webs as follows: This course will look at the role energetics play in mediating the structure and dynamics of…

Fieldwork and Feral Pigs

As an ecologist, I have participated in fieldwork in a variety of terrestrial and aquatic ecosystems.

Reconciling the Omnivory-Stability Debate

Excited that my research has been published in The American Naturalist. (vol.179, no.1), January 2012. Reconciling the Omnivory-Stability Debate Gabriel Gellner and Kevin McCann Abstract Despite attempts at reconciliation, the role of omnivory in food web stability remains unclear. Here we develop a novel community matrix approach that is analogous to the bifurcation method of modular food web…

Food Chains and Food Web Modules

We have written a brief and accessible introduction to Food Chains and Food Web Modules, which discusses typical ways in which ecologists simplify and deconstruct food webs. We briefly review modular theory, focusing on two ubiquitous modules – the food chain and the diamond module – before discussing how results from modular theory contribute to…