OOS 22
Population, Community and Ecosystem Collapse and Recovery: Lessons Learned and Remaining Challenges For The Future Of Ecosystem Management

Wednesday, August 7, 2013: 1:30 PM-5:00 PM
101D, Minneapolis Convention Center
Organizer:
Nika Galic
Co-organizer:
Andrea S. Downing
Moderator:
Andrea S. Downing
Increasing human population and its needs for food, housing, and energy, put ecosystems worldwide under escalating pressures, resulting in damaged ecosystems, disturbing declines in vital natural resources, and an alarming and continuous loss of biodiversity. Many ecosystems are beyond disturbed and have collapsed, i.e. significantly changed their structure, functioning, and, with it, the services they provide for people. For instance, an increasing proportion of fisheries worldwide is either fully- or over- exploited. Agricultural activities resulting in habitat destruction and high nutrient and chemical input into the environment have significantly reduced soil and water quality. Populations of many species around the globe are threatened by the environmental alterations that are a consequence of the changing climate. Understanding the drivers of this change is the first step in the process of recovery. Populations, communities and ecosystems have a capacity to withstand certain pressures that allows them to recover close to their previous state. Many biotic and abiotic factors play important roles in restoring system structure and functioning after disturbances. Ecological factors such as a species’ life-history, trophic position and strength of population regulation govern the population growth rate, which in combination with landscape or environmental factors may determine the population recovery potential. More often, however, systems may never fully recover to their previous state, due to many indirect effects of a specific disturbance and interactions present in the system. Systems may even switch into an alternative stable state, thus seriously compromising recovery to the desired state. In this session, we present examples of population, community and ecosystem key features and processes in preserving or compromising desired system states and in determining their potential for recovery. The speakers presenting cover ongoing findings in empirical and theoretical research.
1:30 PM
 Effects of landscape context and seasonality on time to recovery
Hans Baveco, Alterra, Wageningen University and Research Center; Nika Galic, University of Nebraska-Lincoln; Andreas Focks, Alterra, Wageningen University and Research Center; Paul van den Brink, Alterra, Wageningen University and Research Center
1:50 PM
2:10 PM
2:30 PM
 Recovery in frequently disturbed landscapes: Recolonization consequences for source areas
Nika Galic, University of Nebraska-Lincoln; Andreas Focks, Alterra, Wageningen University and Research Center; Valery Forbes, University of Nebraska-Lincoln; Hans Baveco, Alterra, Wageningen University and Research Center; Paul van den Brink, Alterra, Wageningen University and Research Center
2:50 PM
 Statistical indicators and state-space population models predict extinction in a population of bobwhite quail
Trevor Hefley, University of Nebraska-Lincoln; Andrew J. Tyre, University of Nebraska-Lincoln; Erin E. Blankenship, University of Nebraska
3:10 PM
3:20 PM
 Ecological impacts of two years of extreme drought in a mesic grassland: Rapid recovery despite an extreme response
David L. Hoover, Colorado State University; Alan K. Knapp, Colorado State University; Melinda D. Smith, Colorado State University
3:40 PM
 Spatial resilience: The role of local positive feedbacks for large-scale collapse and recovery
Ingrid Van de Leemput, Wageningen University; Egbert H. van Nes, Wageningen University; Marten Scheffer, Wageningen University
4:00 PM
 Slower recovery in space before collapse of connected populations
Lei Dai, Massachusetts Institute of Technology; Kirill Korolev, Massachusetts Institute of Technology; Jeff Gore, Massachusetts Institute of Technology
4:20 PM
 Alternative stable states in marine food-webs – preventing recovery of overexploited fish stocks?
Anna Gårdmark, Swedish University of Agricultural Sciences; Michele Casini, Swedish University of Agricultural Sciences; Magnus Huss, Swedish University of Agricultural Sciences; Anieke Van Leeuwen, Princeton University; Joakim Hjelm, Swedish University of Agricultural Sciences; Lennart Persson, Umeå University; André M. de Roos, University of Amsterdam
4:40 PM
 Early warning indicators fail to forewarn of impending kelp forest regime shifts
Mark Novak, Oregon State University; Jane Watson, Vancouver Island University; Mike Kenner, University of California; James A. Estes, University of California