Category Archives: Adaptation

Adaptation, Ecological Management

Why Bother with Walters? Revisiting the “classics” of resilience science

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Classic Resilience Readings

Recently at the Stockholm Resilience Centre I’ve been working on update our suggested reading list for our PhD students based on recent research, critiques of various aspects of resilience, and the diversity of research in our centre’s research clusters.  However, I also thought it was important to not just identify the most interesting recent papers but also to identify a set of older (>10 years old) key papers and books that could provide some of the roots of resilience research.

Partly inspired by SRC researcher Wijnand Boonstra’s great initiative to produce a PhD course on the lessons from classic social science for social-ecological research, but also recognizing the shorter history of resilience research, I gave the first of several brief ‘speed talks’ to advertise some of the neglected classics of resilience research that many researchers center are not directly familiar, and explain what useful insights that could offer to them.

Adaptive Management of Renewable Resources

The first key reading I suggested, was Carl J Walters, classic book 1986 Adaptive Management of Renewable Resources.  Below, I describe the book and why it is a classic.  I’ll follow up with some other books and papers over the next few months.

Carl J Walters is a professor at University of British Columbia’s Fisheries Centre, and while he is a leading fisheries scientist, he has also worked on many non-fisheries related problems, ranging from land-use and logging  in British Columbia to the complex social-ecological problems of the Florida Everglades.

His 1986 book is one of the three key early texts in adaptive management.  Walter’s book is practical, technical and empirical.  While the other books Adaptive Environmental Assessment & Management, edited by CS Holling, and Kai Lee’s Compass & Gyroscope are respectively more diverse, and more theoretical and more focussed on social learning.  While the other books are good, in many ways I think Walter’s book is the key adaptive management reference.

So what is the book about?  In Adaptive Management of Renewable Resources, Carl Walters motivates his approach by arguing that because the world is complex and continually evolving it is essential that resource harvesting, management & environmental policies explicitly confront uncertainty.  When the book was written, his argument that management is improved by an explicit focus on uncertainty was unusual, and continues to be unusual in practice, even though adaptive management has been widely adopted in name, but often not in practice or in only an extremely shallow form that misses the deep engagement with the unknown that Walters advocates.  Indeed while quantitative approaches to risk assessment and hedging have greatly expanded over the past several decades, there has not be an increase in thinking about structural uncertainty, unknown, and surprise.

Walters also proposes that science, practice and policy have a lot to gain from mutual engagement, and he has an early and strong advocate of large scale ecological experiments, and noted that such experiments are often required to build strong ecological policies, and to advance large-scale scientific understanding.  While not highlighted in the book, this perspective also opens the way to ecological models that include models of resource harvester behaviour or management or policy processes

Finally, and indeed in many ways the main part of the book, Walters provides a diverse set of soft and hard methods for actually practicing adaptive management.

So why does this book matter today?

I think that sustainability scientists should read this book, or at least parts of it, for several reasons:

  1. It provides a practical primer on how to think about decisions when considering there is both variation in the world and uncertainty about the rules by which the world works.  Such type of thinking is at the centre of sustainability, because sustainability absolutely requires an increase in our ability to build robust strategies for navigating a turbulent world and for planning how and where to invest in monitoring or learning.  While Walters barely mentions resilience in the book, such approaches are essential to the development of resilient strategies, plans, or policies.
  2. The introductory chapters, especially Chapter 3, provide really useful practical advice on how to think about and run participatory modeling workshops.  Walters focuses on participatory modeling workshops but such approaches are equally useful for thinking about planning scenario or assessment workshops.
  3. The bulk of the book provides a solid, clear introduction to a set of methods for linking data and dynamic models using Bayesian statistics.  These approaches quickly get quite technical and are developed primarily for a fisheries context, but for people who are trying to link models and data in a variety of situations they provide a useful toolbox.
  4. Finally, while resilience and optimization approaches can complement one another in theory they are often presented as conflicting in practice (see: Fischer et al 2009  vs.  Holling & Meffe 1996).  This book, clearly links optimization approaches to resilience, and demonstrates by changing what variables are the focus of optimization, optimization approaches can be useful for improving decisions about how to invest in resilience and can provide an good understanding of tradeoffs.

References

Holling, C. S., & Meffe, G. K. (1996). Command and control and the pathology of natural resource management. Conservation Biology, 10(2), 328-337.

Fischer et al (2009) Integrating resilience thinking and optimisation for conservation. TREE, 24, 549–54.

Walters, C. 1986. Adaptive management of renewable resources. International Institute for Applied Systems Analysis. Macmillan Publishing Company, New York, NY, 374. (note the book was out of print for a long time and is now reprinted by Blackburn press.)

Adaptation, Ecological Economics, Ideas, Scenarios

Forty years of Limits to Growth

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The first presentation of the influential environmentalist book Limits to Growth was on March 1 in 1972 at the Smithsonian Institution in Washington DC, four decades ago.

The study was both hugely influential and hugely controversial, and the authors were quite strongly attacked, often for analytical flaws that their study never said or did.  However, after two followup books, and renewed discussions of peak oil (etc) & planetary boundaries, there has been an increased appreciation of Limits to Growth.

After 40 years it seems that:

  1. Limits to Growth was a pretty good first stab at a global model (look at the number of models based on it)
  2. That the scenarios in Limits to Growth were fairly reasonable  (see here and here, here)
  3. That humanity has avoided some really bad trajectories, but could have done a lot better
  4. And that today, global civilization is pushing up against all sort of boundaries and we require more and more innovation to keep going and
  5. We probably need to have a major societal transformation to create a good Anthropocene.

For more on this, see Australian corporate environmentalist Paul Gilding‘s book Great Disruption, just is based on a similar assessment of the world – and he just gave a TED talk based on the book.

Various Limits related events have been timed for this 40th anniversary.

First, the Smithsonian is hosting Perspectives on Limits to Growth – which will feature two of the original members of the team that wrote Limits.  They describe the seminar:

The Club of Rome and the Smithsonian Institution’s Consortium for Understanding and Sustaining a Biodiverse Planet are hosting a symposium on March 1, 2012 to celebrate the 40th anniversary of the launching of Limits to Growth, the first report to the Club of Rome published in 1972. This book was one of the earliest scholarly works to recognize that the world was fast approaching its sustainable limits. Forty years later, the planet continues to face many of the same economic, social, and environmental challenges as when the book was first published.

The morning session will start at 9:00 a.m. and will focus on the lessons of Limits to Growth. The afternoon session will begin at 1:45 p.m. and will address the difficult challenges of preserving biodiversity, adjusting to a changing climate, and solving the societal issues now facing the planet. The symposium will end with a thought-provoking panel discussion among the speakers on future steps for building a sustainable planet.

The meeting will be live-streamed and video archived on the internet at Perspectives on Limits to Growth.

Second, coinciding with the with anniversary is the release an interesting report Life beyond Growth 2012.  Alan AtKisson, author of Believing Cassandra and colleague of many limits authors, wrote the report for the Japanese Institute for Studies in Happiness, Economy, and Society.

Life Beyond Growth is the product of a year of research and reflection, during which the world experienced tumultuous changes, ranging from the Arab Spring to the Great East Japan Earthquake to the “Occupy” movement to the near-meltdown of the Eurozone.

Despite all the economic and political turmoil, a revolution in economic thought continued to gain steam. From “Green Economy” to “Gross National Happiness” to the more radical notion of “De-growth,” governments around the world have continued to explore new ways to frame, and measure, the idea of national progress. Most recently, the United Nations has formally joined the dialogue, with its own high-level panel calling for “new ways to measure progress” in advance of the Rio+20 global summit.

And third, one that was not planned to coincide with the anniversary, but is importantly connected Victor Galaz and many other have a new paper Planetary boundaries’ — exploring the challenges for global environmental governance, which is not freely available, in Current Opinion in Environmental Sustainability (http://dx.doi.org/10.1016/j.cosust.2012.01.006).  The article (from the abstract):

… provides an overview of the global governance challenges that follow from this notion of multiple, interacting and possibly non-linear ‘planetary boundaries’. Here we discuss four interrelated global environmental governance challenges, as well as some possible ways to address them. The four identified challenges are related to, first, the interplay between Earth system science and global policies, and the implications of differences in risk perceptions in defining these boundaries; second, the capacity of international institutions to deal with individual ‘planetary boundaries’, as well as interactions between them; third, the role of international organizations in dealing with ‘planetary boundaries’ interactions; and fourth, the role of global governance in framing social–ecological innovations.

Adaptation, Vulnerability

Resilience and Euro – diversity

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On MacroEconomic Resilience ex-banker Ashwin Parameswaran draws upon Holling’s pathology of natural resource management and the work of Hyman Minsky (a connection I’ve mentioned previously and Ashwin has explored extensively – see here and here) to write about The Resilience Stability Tradeoff: Drawing Analogies between River Flood Management and Macroeconomic Management.

Ashwin Parameswaran insightfully writes:

In complex adaptive systems, stability does not equate to resilience. In fact, stability tends to breed loss of resilience and fragility or as Minsky put it, “stability is destabilising”. Although Minsky’s work has been somewhat neglected in economics, the principle of the resilience-stability tradeoff is common knowledge in ecology, especially since Buzz Holling’s pioneering work on the subject. If stability leads to fragility, then it follows that stabilisation too leads to increased system fragility. As Holling and Meffe put it in another landmark paper on the subject titled ‘Command and Control and the Pathology of Natural Resource Management’, “when the range of natural variation in a system is reduced, the system loses resilience.” Often, the goal of increased stability is synonymous with a goal of increased efficiency but “the goal of producing a maximum sustained yield may result in a more stable system of reduced resilience”.

The entire long arc of post-WW2 macroeconomic policy in the developed world can be described as a flawed exercise in macroeconomic stabilisation. But there is no better example of this principle than the Euro currency project as the below graph (from Pictet via FT Alphaville) illustrates.

Instead of a moderately volatile mix of different currencies and interest rates, we now have a mostly stable currency union prone to the occasional risk of systemic collapse. If this was all there is to it, then it is not clear that the Euro is such a bad idea. After all, simply shifting the volatility out to the tails is not by itself a bad outcome. But the resilience-stability tradeoff is more than just a simple transformation in distribution. Economic agents adapt to a prolonged period of stability in such a manner that the system cannot “withstand even modest adverse shocks”. “Normal” disturbances that were easily absorbed prior to the period of stabilisation are now sufficient to cause a catastrophic transition. Izabella Kaminska laments the fact that sovereign spreads for many Eurozone countries (vs 10Y Bunds) now exceed pre-Euro levels. But the real problem isn’t so much that spreads have blown out but that they have blown out after a prolonged period of stability.

Adaptation

Reinventing social-ecological memory

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Nuu-chah-nulth Canoe Steaming video from Tofino, British Columbia shows the reinvention of historic canoe making, both as political symbol and for cultural tourism.

Nuu-chah-nulth Canoe Steaming, by Jacqueline Windh a Tofino based writer and photographer.  She made the video of master Nuu-chah-nulth canoe carvers Joe and Carl Martin steam a dugout canoe on Chestermans Beach, Tofino, Vancouver Island, British Columbia.

For more on the canoe see a travel article written by Jacqueline Windh.

I’d like to know the story of how a group of German apprentices (the folks in black/white clothes + hats) ended up helping out, and whether it represents a collaboration.

Adaptation, Ecological Management, Ideas

Stafford Beer on Ross Ashby

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Here is some old time systems theory from my Swedish summer reading.

Stafford Beer on Ross Ashby‘s Law of Requisite Variety in his paper “The Viable System Model: Its Provenance, Development, Methodology and Pathology” in The Journal of the Operational Research Society, Vol. 35, No. 1 (Jan., 1984), pp. 7-25

It has always seemed to me that Ashby’s Law stands to management science as Newton’s Laws stand to physics; it is central to a coherent account of complexity control. “Only variety can destroy variety.” People have found it tautologous; but all mathematics is either tautologous or wrong. People have found it truistic; in that case, why do managers constantly act as if it were false? Monetary controls do not have requisite variety to regulate the economy. The Finance Act does not have requisite variety to regulate tax evasion. Police procedures do not have requisite variety to suppress crime. And so on. All these regulators could be redesigned according to cybernetic principles…

Much more on Beer and Ashby can be found in Andrew Pickering’s fine book – the Cybernetic Brain – sketches of another future.

Adaptation, Cities, Ecosystem services

Chicago invests in resilient ecological infrastructure

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Leslie Kaufman in the New York Times has a good article, A City Prepares for a Warm Long-Term Forecast, that reviews Chicago’s efforts to improve its ecological infrastructure. The article describes the city’s approach to climate change adaptation:

As a first step, the city wanted to model how global warming might play out locally. …  the scientists said, Chicago would have summers like the Deep South, with as many as 72 days over 90 degrees before the end of the century. For most of the 20th century, the city averaged fewer than 15. By 2070, Chicago could expect 35 percent more precipitation in winter and spring, but 20 percent less in summer and fall. By then, the conditions would have changed enough to make the area’s plant hardiness zone akin to Birmingham, Ala. But what would that mean in real-life consequences?

A private risk assessment firm was hired, and the resulting report read like an urban disaster film minus Godzilla. The city could see heat-related deaths reaching 1,200 a year. The increasing occurrences of freezes and thaws (the root of potholes) would cause billions of dollars’ worth of deterioration to building facades, bridges and roads. Termites, never previously able to withstand Chicago’s winters, would start gorging on wooden frames. Armed with the forecasts, the city prioritized which adaptations would save the most money and would be the most feasible in the light of tight budgets and public skepticism.

… Much of Chicago’s adaptation work is about transforming paved spaces. “Cities are hard spaces that trap water and heat,” said Janet L. Attarian, a director of streetscapes at the city’s Department of Transportation. “Alleys and streets account for 25 percent of groundcover, and closer to 40 percent when parking lots are included.” The city’s 13,000 concrete alleyways were originally built without drainage and are a nightmare every time it rains. Storm water pours off the hard surfaces and routinely floods basements and renders low-lying roads and underpasses unusable.

To make matters worse, many of the pipes that handle storm overflow also handle raw sewage. After a very heavy rain, if overflow pipes become congested, sewage backs up into basements or is released with the rainwater into the Chicago River — … As the region warms, Chicago is expecting more frequent and extreme storms. In the last three years, the city has had two intense storms classified as 100-year events.

So the work planned for a six-point intersection on the South Side with flooding and other issues is a prototype. The sidewalk in front of the high school on Cermak Road has been widened to include planting areas that are lower than the street surface. This not only encourages more pedestrian traffic, but also provides shade and landscaping. These will be filled with drought-resistant plants like butterfly weed and spartina grasses that sponge up excess water and help filter pollutants like de-icing salts. In some places, unabsorbed water will seep into storage tanks beneath the streets so it can be used later for watering plants or in new decorative fountains in front of the high school. The bike lanes and parking spaces being added along the street are covered with permeable pavers, a weave of pavement that allows 80 percent of rainwater to filter through it to the ground below. Already 150 alleyways have been remade in this way.

… Awareness of climate change has filled Chicago city planners with deep concern for the trees. Not only are they beautiful, said Ms. Malec-McKenna, herself trained as a horticulturalist, but their shade also provides immediate relief to urban heat islands. Trees improve air quality by absorbing carbon dioxide, and their leaves can keep 20 percent of an average rain from hitting the pavement. Chicago spends over $10 million a year planting roughly 2,200 trees. From 1991 to 2008, the city added so many that officials estimate tree cover increased to 17.6 percent from 11 percent. The goal is to exceed 23 percent this decade.

The problem is that for trees to reach their expected lifespan — up to 90 years — they have to be able to endure hotter conditions. Chicago has already changed from one growing zone to another in the last 30 years, and it expects to change several times again by 2070. Knowing this, planners asked experts at the city’s botanical garden and Morton Arboretum to evaluate their planting list. They were told to remove six of the most common tree species. Off came the ash trees that account for 17 percent of Chicago tree cover, or more than any other tree. … So Chicago is turning to swamp white oaks and bald cypress. It is like the rest of adaptation strategy, Ms. Malec-McKenna explains: “A constant ongoing process to make sure we are as resilient as we can be in facing the future.”

Update:
On Dot Earth Andrew Revkin follows up with links to his description of Seoul and other cities that have substantially improved their ecological infrastructure.

Adaptation, Regime Shifts

Is a Good Anthropocene Possible?

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Will Steffen and I gave contrasting talks in a Mock Court on the meaning of the Anthropocene at the 3rd Nobel Laureate Symposium on Global Sustainability in Stockholm.  The talks are now online, along with other talks from the symposium (I recommend Frances Westley‘s on innovation).

Will and I were arguing about four charges (defined by the Symposium organizers):

  1. Humanity has pushed the Earth out of the Holocene epoch.
  2. Humanity is at risk of pushing the planet across catastrophic tipping points.
  3. Incrementality is dead as a strategy for human development in an era of rapid global change
  4. Humanity can prosper, in the Anthropocene, within the safe operating space of planetary boundaries (within the intrinsic boundaries of the Earth System).

I accepted Will’s case on the first point, but argued against 2&3 and for 4.  The jury of Nobel Laureate ruled.

  1. Humanity has pushed the Earth out of the Holocene epoch. Yes
  2. Humanity is at risk of pushing the planet across catastrophic tipping points. Lack of evidence.  The key sticking point here was the word “catastrophic”.
  3. Incrementality is dead as a strategy for human development in an era of rapid global change.  No
  4. Humanity can prosper, in the Anthropocene, within the safe operating space of planetary boundaries (within the intrinsic boundaries of the Earth System). Yes (But the key word is can – there is no guarantee humanity will.)
Adaptation, General, Networks, Reflections, Visualization

Information and communication technologies in the Anthropocene

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UPDATED: Slides from the talks at the end of this blogpost

The use of social media for political mobilization during the political uprisings in Northern Africa and the Middle East during 2010 and 2011; digital coordination of climate skeptic networks during “Climategate” in 2010; and the repercussions of hackers in carbon markets the last years. These are all examples of intriguing phenomena that take place at the interface between rapid information technological change, and the emergence of globally spanning virtual networks.

Exactly how information and communication technologies affect the behavior of actors at multiple scales, is of course widely debated. The question is: how do we make sense of these changes, from a wider resilience perspective?

Some of these discussions took place at the 2011 Resilience conference in Arizona in a panel convened by us at the Stockholm Resilience Centre, and with generous support from the International Development Research Centre (IDRC, Canada). Ola Tjornbo from Social Innovation Generation (SIG) at the University of Waterloo, explored some of the opportunites, but also profound challenges, related in trying to design effective virtual deliberation processes. Ola noted that while several success stories related to crowd-sourcing (Wikipedia) and collective intelligence (e.g. Polymath) do exist, we have surprisingly little systematic knowledge of how to design digital decision-making processes that help overcome conflicts of interest related to issues of sustainability. Some if these issues are elaborated by SiG, and you can find videos from an interesting panel on “Open Source Democracy” here.

Richard Taylor from SEI-Oxford presented a rapidly evolving platform for integration and dissemination of knowledge on climate adaptation – weADAPT. This platform combines the strengths of a growing community of climate adaptation experts, a database of ongoing local climate adaptation projects, semantic web technologies, and a Google Earth interface. The visualizations are stunning, and provide and interesting example of how ICTs can be used for scientific communication.

Angelica Ospina from the Centre of Development Informatics at the University of Manchester, showcased some ongoing work on mobile technologies and climate adaptation resilience. As Ospina noted, ICTs can provide some very tangible support for various features of resilience, ranging from self-organization, to learning and flexibility. You can find a working paper  by Angelica here.

To summarize: three very different yet complementary perspectives on how ICTs could be harnessed in the Anthropocene: by building new types of virtually supported decision making and collective intelligence processes; linking expert communities and local natural resource management experimentation together; and by exploring the resilience building strengths of decentralized mobile technologies.

Slides from the talks

Victor Galaz (intro)

Ola Tjornbo

Richard Taylor

Adaptation, Visualization

Peak Travel?

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A new paper in Transport Reviews by Adam Millard-Ball and Lee Schipper asks Are We Reaching Peak Travel? Trends in Passenger Transport in Eight Industrialized Countries.

Ball and Schipper looked at data from 1970-2008 in the United States, Canada, Sweden, France, Germany, the United Kingdom, Japan and Australia.  They show that increases in passenger activity have driven energy use in transport, because growths in activity have swamped increases in efficiency.  But the relationship between travel and GDP changed during the last decade.  Previously increases in GDP lead to increases in travel, but in the last decade travel seems to have plateaued, and this halting of growth does not appear to be due to increases in gas prices. This is shown in Figure 2 in their paper.

In light of these findings, it becomes evident that understanding and forecasting inflection points in transportation trends is crucial for effective future planning. This is particularly significant for countries like Australia, known for its thriving tourism industry, with popular destinations like the Gold Coast attracting millions of visitors annually. By examining the changes in passenger activity and energy use in transport, as highlighted by Ball and Schipper’s research, policymakers and tourism authorities in Australia can better anticipate shifts in travel patterns and tailor their strategies accordingly. For instance, analyzing the impact of GDP growth on travel trends in the context of Australia’s tourism sector could help identify potential opportunities and challenges for the industry, potentially leading to more sustainable and efficient approaches in promoting travel experiences within the Gold Coast travel guide and beyond.

One of the challenges in planning for the future is anticipating inflection points in ongoing trends.  This paper could have made this point stronger if they compared predicted vehicle use against actual vehicle use, but that was not their main point.

They write:

As with total travel activity, the recent decline in car and light truck use is difficult to attribute solely to higher fuel prices, as it is far in excess of what recent estimates of fuel price elasticities would suggest. For example, Hughes et al. (2006) estimate the short-run fuel price elasticity in the U.S. to range from -0.034 to -0.077, which corresponds to a reduction in fuel consumption by just over 1% in response to the 15% increase in gasoline prices between 2007 and 2008. In reality, per capita energy use for light-duty vehicles fell by 4.3% over this period.

…[in these countries transportation sector] the major factor behind increasing energy use and CO2 emissions since the 1970s – activity – has ceased its rise, at least for the time being. Should this plateau continue, it is possible that accelerated decline in the energy intensity of car travel, some shifts back to rail and bus modes, and at least somewhat less carbon per unit of energy might leave absolute levels of emissions in 2020 or 2030 lower than today.

via Miller-Mcune

Adaptation, Cities, Ecosystem services, Ideas, Networks, Tools

Scale-crossing brokers: new theoretical tools to analyze adaptive capacity

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Social network structure for ecosystem governance.

Social network structure matters for adaptive capacity. A key position are 'scale-crossing brokers' that link actors interacting with ecosystem processes at different ecological scales.

Together with colleagues from Stockholm University we have just published an article in Ecology and Society called:

Scale-crossing brokers and network governance of urban ecosystem services: the case of Stockholm

Henrik Ernstson, Stephan Barthel, Erik Andersson and Sara T. Borgström, Ecology and Society 2010: 15 (4), 28.

The article synthesizes empirical studies of urban ecological management in Stockholm. However, it also contributes to the theoretical discussions on adaptive governance of social-ecological systems (e.g. special issue in Global Environmental Change, Folke et al. 2005, Duit and Galaz, 2008). As such, the article is of interest for studies in marine, forest and agricultural systems.

Here I present some key theoretical ideas. (See also blog at Stockholm Resilience Centre.).

Framework for assessing adaptive capacity – linking ecological processess and social network structure

The article builds a theoretical framework that links ecological processes to social network structures to assess the adaptive capacity of ecosystem governance. In effect, the article pushes present theorizations in at least three aspects: 1) spatial complexity, 2) the role of social network structure, and 3) how to handle cross-scale interactions.

1) Spatial complexity

First, it builds a framework to more explicitly account for spatial complexity (and thus the complexity of the ‘resource’ in question). This is primarily done through empirically focus on the ecological processes of seed-dispersal and pollination, which are processes important for the re-generation and resilience of local ecosystems in the fragmented urban landscape of Stockholm.

2) Social network structure as intermediate variable

Second, the paper ‘looks’ beyond individual actors and their direct ties to others (often the case in the literature on for instance ‘bridging organizations’). Instead, actors that interact with ecological processes are seen as embedded in patterns of communication and social relations. This means that the paper acknowledges ‘social network structure’ and how this intermediate variable (not individual, not institution) mediates the agency of single actors, and the performance of the whole network to respond to change.

To capture social dynamics we take the idea from sociology that, just as ecological patches are part of greater scale patterns, social actors are part of emergent social network structures that constrain and shape social dynamics (Wasserman and Faust 1994). […] social network patterns are consequently an outcome of localized interactions between pairs of actors, and no actor can fully control the emergent structure. [This] allows for human agency, but an agency constrained and mediated through the network structure itself (Emirbayer and Goodwin 1994).

3) Cross-scale interactions and scale-crossing brokers

Third, the paper pushes the understanding of what it would mean for a set of identifiable actors to handle cross-scale interactions in social-ecological systems. This is done through developing a network model of how certain actor groups engage in ecological processes at different scales through their social practice, and to theorize a key network position called ‘scale-crossing broker’ (building on Burt’s notion of brokers):

Thus, by accounting for the structure of social networks between actor groups, and how they link to ecological scales, our resulting model consists of actor groups interacting both with each other and with ecosystem processes at different spatial scales, and at spatially separate sites [see figure at top].

A final central aspect of our model is the network position of scale-crossing broker [which is defined] as a social network position that links otherwise disconnected social actor groups which, through their social practices, interact with ecosystem processes at different ecological (and spatial) scales and at different physical sites.

In relation to the discussion on how governance systems can cope with slow changes on one hand, and rapid changes on the other, our answer indicates that we must look for this in the social network structure that links various actors across scales. In that sense, the scale-crossing broker becomes “a crossroad for possibilities” and could facilitate the “switching” between supporting localized social learning processes (in times of slow change), and centralized collective action (in times of rapid change):

Scale-crossing brokers can be seen as agents for nurturing the emergence of a purposeful social network structure, and for switching between a centralized collective action mode and a decentralized mode of social learning among a diverse set of local autonomous actor groups.

Assessing governance systems

As such, the scale-crossing broker becomes an analytical lens to use when assessing empirical governance systems. Upcoming research should thus aim to measure the extent to which you can find scale-crossing brokers in a particular system. Another such assessment tool lies in our conceptualization of a meso-scale in governance in the form of ‘city-scale green networks’ (see figure below).

In conclusion, and apart from its empirical findings not touched upon in this blog, the paper can be seen as bringing new theoretical ideas on how to discuss and analyze social-ecological complexity and adaptive capacity. For more information see the paper itself, the blog-post at Stockholm Resilience Centre, or my own blog In Rhizomia.

The article is part of a special issue in Ecology and Society on social network analysis and natural resource management.

Governance of complex ecological processes

Fig. 4. The figure demonstrates how one could identify the city scale green networks of pollination and seed dispersal in a particular area of Stockholm (suggested here by using digital mapping and ecological network analysis (cf. Andersson and Bodin 2008)). Note how certain local green areas are shared between the two city scale green networks, which give rise to network overlap (purple areas with bold vertical lines in city scale green network 2). Furthermore, it is suggested that midscale managers can take responsibility for particular city scale green networks. Taken as a whole, the figure demonstrates how particular ecosystem services can be viewed as embedded both in the physical landscape and within social networks of local actor groups (managing local green areas), scale-crossing brokers, and municipal to regional actors.