Defining Species Recovery: A Global Endeavour

Molly Grace
4 minutes read

Credit: Andrey Gilev, Karina Karenina

As you might have guessed from the lack of capitalisation, the parliament which I am referring to is not a national one; rather, the parliament that spurred our paper is the Members’ Assembly of the International Union for Conservation of Nature. If that name sounds familiar to you, it’s probably because of the IUCN Red List of Threatened Species, the world’s most comprehensive assessment of species’ extinction risk (and where the well-known terms “Vulnerable”, “Endangered”, and “Critically Endangered” come from).

The Members’ Assembly, made up of government and NGO representatives, meets every four years at the IUCN World Conservation Congress to make decisions about priorities and actions for conservation and sustainability. In 2012, the Congress was convened in Jeju, Republic of Korea, and at that meeting the Members’ Assembly passed a Resolution: that the IUCN needs to move beyond assessing extinction risk only and develop a standardised way to measure species recovery as a way to systematically assess conservation success. The idea for a “Green List of Species” was born—an assessment of recovery and conservation impact that would complement the Red List.

Why did the Members’ Assembly feel strongly enough about species recovery to set a Resolution? For one thing, preventing extinctions is obviously critically important, but it is not sufficient, because loss of species’ functions in the ecosystem can happen well before species extinction (e.g., McConkey and O’Farrell 2016). For example, seed dispersal by flying foxes is almost completely dependent on intraspecific antagonistic interactions, where certain individuals defend fruiting trees and rivals must snatch fruits and fly to safety before consuming them. If flying fox densities get too low, these interactions—and seed dispersal— cease (McConkey and Drake 2006). So, besides having a robust way to measure extinction risk, we also need a robust way to determine when a species has recovered to a functional level.


For another, the IUCN Resolution recognized the need to recognize and incentivise successful conservation. As it stands currently, limited funds for conservation are allocated preferentially to species at the greatest risk of extinction. While this makes sense, in practice it means that once a conservation success has been achieved—i.e., moving a species further away from the brink of extinction—funding is often lost, which can allow decades of work to be eroded and the species can slip back in the wrong direction. This creates a perverse incentive for conservationists to downplay successes, which can give the public the impression that conservation doesn’t work when in fact there have been many great achievements! If we can create a standardised way to measure recovery, perhaps new funding streams can be created to help us maintain it.


Thus, the 2012 Resolution was passed, and an international effort began. A Task Force on Assessing Conservation Success was formed, and worldwide consultations began to figure out what a Green List of Species would look like in practice. Between 2012 and today, over one hundred scientists, conservation practitioners, and policymakers have been consulted in meetings worldwide: from Cuernavaca, Mexico to Tallinn, Estonia; from Abu Dhabi, to Honolulu, to London. The result is the published draft framework, which we hope will provoke debate and stir comments and constructive criticism. As we note in the paper, the Green List is not intended as an alternative to the IUCN Red List. Rather, it will be fully integrated into the IUCN Red List and thus allow a more complete assessment of a species’ conservation status, prospects, and our collective impact.


Over the next few years, we will be testing and refining this draft framework for an official launch at the next World Conservation Congress in 2020. If you’d like to learn more, offer comment, or get involved, we invite you to read our paper in Conservation Biology and explore our project pages.

Literature Cited

Akçakaya, H. R., Bennett, E. L., Brooks, T. M., Grace, M. K., Heath, A., Hedges, S., Hilton‐Taylor, C., Hoffmann, M., Keith, D., Long, B., Mallon, D. P., Meijaard, E., Milner‐Gulland, E.J., Rodrigues, A., Rodriguez, J. P., Stephenson, P. J., Stuart, S. N., Young, R. P. (2018). Quantifying species recovery and conservation success to develop an IUCN Green List of Species. Conservation Biology.

McConkey, K. R., & Drake, D. R. (2006). Flying foxes cease to function as seed dispersers long before they become rare. Ecology, 87(2), 271-276.

McConkey, K. R., & O’Farrill, G. (2016). Loss of seed dispersal before the loss of seed dispersers. Biological Conservation, 201, 38-49


Molly Grace | Departmental Lecturer
Molly joined ICCS as a Knowledge Exchange Fellow in October 2017. She is the Coordinator of the Species Conservation Success Task Force of the IUCN Species Survival Commission. This Task Force is responsible for developing and delivering the new Green List of Species, which will provide a standardised way to measure conservation success and account for the positive impacts of conservation. Currently, conservation success is measured in terms of the outcome we wish to avoid (extinction) rather than the outcome we wish to achieve: the recovery of populations carrying out their ecological roles throughout their indigenous range. Her position is funded by the Natural Environment Research Council (supporting Molly as a Knowledge Exchange Fellow), IUCN, Global Wildlife Conservation, and the Cambridge Conservation Initiative Collaborative Fund.

Previously, Molly's research focus was in road ecology, specifically the effects of roads on behaviour of wildlife and humans. She pursued this interest at Duke University (working with Steve Nowicki and Rindy Anderson studying how traffic noise affects songbird communication) and at the University of Central Florida (working with Reed Noss to explore how traffic noise affects amphibian behaviour, and how best to prevent collisions between vehicles and large animals).