A framework to quantify the strength of ecological links between an environmental stressor and final ecosystem services.

Anthropogenic stressors such as climate change, increased fire frequency, and pollution drive shifts in ecosystem function and resilience. Scientists generally rely on biological indicators of these stressors to signal that ecosystem conditions have been altered. However, these biological indicators are not always capable of being directly related to ecosystem components that provide benefits to humans and/or can be used to evaluate the cost-benefit of a change in health of the component (ecosystem services). Therefore, we developed the STEPS (STressor - Ecological Production function - final ecosystem Services) Framework to link changes in a biological indicator of a stressor to final ecosystem services. The STEPS framework produces "chains" of ecological components that explore the breadth of impacts resulting from the change of a stressor. Chains are comprised of the biological indicator, the ecological production function (EPF; which uses ecological components to link the biological indicator to a final ecosystem service), and the user group who directly uses, appreciates, or values the component. The framework uses a qualitative score (High, Medium, Low) to describe the Strength of Science (SOS) for the relationship between each component in the EPF. We tested the STEPS Framework within a workshop setting using the exceedance of critical loads of air pollution as a model stressor and the Final Ecosystem Goods and Services Classification System (FEGS-CS) to describe final ecosystem services. We identified chains for four modes of ecological response to deposition: aquatic acidification, aquatic eutrophication, terrestrial acidification, and terrestrial eutrophication. The workshop participants identified 183 unique EPFs linking a change in a biological indicator to a FEGS; and when accounting for the multiple beneficiaries, we ended with 1104 chains. The SOS scores were effective in identifying chains with the highest confidence ranking as well as those where more research is needed. The STEPS framework could be adapted to any system in which a stressor is modifying a biological component. The results of the analysis can be used by the social science community to apply valuation measures to multiple or selected chains, providing a comprehensive analysis of the effects of anthropogenic stressors on measures of human well-being.

[1]  R. Brooker,et al.  Importance: an overlooked concept in plant interaction research , 2008 .

[2]  Christopher J. Lortie,et al.  The importance of importance , 2005 .

[3]  R. Costanza,et al.  SPECIAL ISSUE: The Dynamics and Value of Ecosystem Services: Integrating Economic and Ecological Perspectives Economic and ecological concepts for valuing ecosystem services , 2002 .

[4]  M. G. Ryan,et al.  Continued warming could transform Greater Yellowstone fire regimes by mid-21st century , 2011, Proceedings of the National Academy of Sciences.

[5]  Matthew V. Talluto,et al.  Historical change in coastal sage scrub in southern California, USA in relation to fire frequency and air pollution , 2008, Landscape Ecology.

[6]  Claire B. O'Dea,et al.  Impacts to ecosystem services from aquatic acidification: using FEGS‐CS to understand the impacts of air pollution , 2017 .

[7]  B. Gimeno,et al.  Nitrogen critical loads and management alternatives for N-impacted ecosystems in California. , 2010, Journal of environmental management.

[8]  Douglas T. Bolger,et al.  EFFECTS OF FRAGMENTATION AND INVASION ON NATIVE ANT COMMUNITIES IN COASTAL SOUTHERN CALIFORNIA , 1998 .

[9]  Jana E. Compton,et al.  Cost of reactive nitrogen release from human activities to the environment in the United States , 2015 .

[10]  T. Plieninger,et al.  An empirical review of cultural ecosystem service indicators , 2013 .

[11]  R. D. Groot,et al.  Challenges in integrating the concept of ecosystem services and values in landscape planning, management and decision making , 2010 .

[12]  G. M. Clarke,et al.  Fluctuating asymmetry of invertebrate populations as a biological indicator of environmental quality. , 1993, Environmental pollution.

[13]  T. Greaver,et al.  Terrestrial acidification and ecosystem services: effects of acid rain on bunnies, baseball, and Christmas trees , 2017, Ecosphere.

[14]  D. Phillips.  The use of biological indicator organisms to monitor trace metal pollution in marine and estuarine environments—a review , 1977 .

[15]  A. Wossink,et al.  Marketed outputs and non-marketed ecosystem services: the evaluation of marginal costs , 2013 .

[16]  Lauraine G Chestnut,et al.  A fresh look at the benefits and costs of the US acid rain program. , 2005, Journal of environmental management.

[17]  K. Gaston,et al.  Extinction of experience: the loss of human–nature interactions , 2016 .

[18]  J. Lynch,et al.  Effects of nitrogen deposition and empirical nitrogen critical loads for ecoregions of the United States , 2011 .

[19]  Roy Haines-Young,et al.  Common International Classification of Ecosystem Services (CICES): Consultation on Version 4, August-December 2012 , 2013 .

[20]  Scott R. Abella,et al.  Climate, trees, pests, and weeds: Change, uncertainty, and biotic stressors in eastern U.S. national park forests , 2014 .

[21]  I. Côté,et al.  Quantifying the evidence for ecological synergies. , 2008, Ecology letters.

[22]  R. Costanza,et al.  Contributions of cultural services to the ecosystem services agenda , 2012, Proceedings of the National Academy of Sciences.

[23]  Geoffrey Heal.  Valuing Ecosystem Services , 2000, Ecosystems.

[24]  Shahid Naeem,et al.  Species Redundancy and Ecosystem Reliability , 1998 .

[25]  J. Boyd,et al.  What are Ecosystem Services? The Need for Standardized Environmental Accounting Units , 2006 .

[26]  E. Allen,et al.  Combined effects of precipitation and nitrogen deposition on native and invasive winter annual production in California deserts , 2009, Oecologia.

[27]  Kevin J. Gaston,et al.  The Health Benefits of Urban Nature: How Much Do We Need? , 2015 .

[28]  C. Barrows,et al.  Modeling impacts of climate change on Joshua trees at their southern boundary: How scale impacts predictions , 2012 .

[29]  P. Rundel,et al.  Land Use Compounds Habitat Losses under Projected Climate Change in a Threatened California Ecosystem , 2014, PloS one.

[30]  Millenium Ecosystem Assessment.  Ecosystems and human well-being: synthesis , 2005 .

[31]  J. Lynch,et al.  Ecological effects of nitrogen and sulfur air pollution in the US: what do we know? , 2012 .

[32]  S. Weiss,et al.  Cars, Cows, and Checkerspot Butterflies: Nitrogen Deposition and Management of Nutrient‐Poor Grasslands for a Threatened Species , 1999 .

[33]  S. Schneider,et al.  Climate Change 2001: Synthesis Report: A contribution of Working Groups I, II, and III to the Third Assessment Report of the Intergovernmental Panel on Climate Change , 2001 .

[34]  E. Cowling,et al.  The Nitrogen Cascade , 2003 .

[35]  N. Crossman,et al.  Global estimates of the value of ecosystems and their services in monetary units , 2012 .

[36]  J. Minx,et al.  Climate Change 2014 : Synthesis Report , 2014 .

[37]  J. Nilsson,et al.  Critical Loads for Sulphur and Nitrogen , 1988 .

[38]  O. Hoegh‐Guldberg,et al.  Ecological responses to recent climate change , 2002, Nature.

[39]  M. Fenn,et al.  Ecological Effects of Nitrogen Deposition in the Western United States , 2003 .

[40]  Mary L. Cadenasso,et al.  Dimensions of ecosystem complexity: Heterogeneity, connectivity, and history , 2006 .

[41]  G. Asner,et al.  Nitrogen Cycles: Past, Present, and Future , 2004 .

[42]  G Cecchetti,et al.  Biological monitoring: lichens as bioindicators of air pollution assessment--a review. , 2001, Environmental pollution.

[43]  Stephen R. Carpenter,et al.  Uncertainty in discount models and environmental cccounting , 2005 .

[44]  Rachelle K. Gould,et al.  Where are Cultural and Social in Ecosystem Services? A Framework for Constructive Engagement , 2012 .

[45]  T. Swetnam,et al.  Warming and Earlier Spring Increase Western U.S. Forest Wildfire Activity , 2006, Science.

[46]  A. Troy,et al.  Linking Ecology and Economics for Ecosystem Management , 2006 .

[47]  J. Lynch,et al.  Diatoms to human uses: linking nitrogen deposition, aquatic eutrophication, and ecosystem services , 2017 .

[48]  Larry Kapustka,et al.  Using ecological production functions to link ecological processes to ecosystem services , 2017, Integrated environmental assessment and management.

[49]  S. Jovan,et al.  Eutrophic lichens respond to multiple forms of N: implications for critical levels and critical loads research. , 2012, Ecological applications : a publication of the Ecological Society of America.

[50]  A. P. Wolfe,et al.  Recent Changes in the Diatom Community Structure of Lakes in the Beartooth Mountain Range, U.S.A. , 2003 .