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Selection: with tag regime-shift [7 articles] 

 

Tamm Review - Shifting global fire regimes: lessons from reburns and research needs

  
Forest Ecology and Management, Vol. 396 (July 2017), pp. 217-233, https://doi.org/10.1016/j.foreco.2017.03.035

Abstract

[Highlights] [::] We reviewed published studies on reburns in fire-adapted ecosystems of the world. [::] Fire regimes often have shifted from frequent to infrequent fire return intervals. [::] Legacies of past burns constrain the spread and severity of future fires. [::] Periodic fire generally favors fire-adapted vegetation and limits closed forests. [::] Better understanding of reburns informs climate change adaptation methods. [Abstract] Across the globe, rising temperatures and altered precipitation patterns have caused persistent regional droughts, lengthened fire seasons, and increased the number of weather-driven extreme fire events. ...

 

Repeated wildfires alter forest recovery of mixed-conifer ecosystems

  
Ecological Applications, Vol. 26, No. 6. (September 2016), pp. 1842-1853, https://doi.org/10.1890/15-1521.1

Abstract

Most models project warmer and drier climates that will contribute to larger and more frequent wildfires. However, it remains unknown how repeated wildfires alter post-fire successional patterns and forest structure. Here, we test the hypothesis that the number of wildfires, as well as the order and severity of wildfire events interact to alter forest structure and vegetation recovery and implications for vegetation management. In 2014, we examined forest structure, composition, and tree regeneration in stands that burned 1–18 yr before a ...

 

Reboot for the AI revolution

  
Nature, Vol. 550, No. 7676. (17 October 2017), pp. 324-327, https://doi.org/10.1038/550324a

Abstract

As artificial intelligence puts many out of work, we must forge new economic, social and educational systems, argues Yuval Noah Harari. [Excerpt] The ongoing artificial-intelligence revolution will change almost every line of work, creating enormous social and economic opportunities — and challenges. Some believe that intelligent computers will push humans out of the job market and create a new 'useless class'; others maintain that automation will generate a wide range of new human jobs and greater prosperity for all. Almost everybody agrees ...

 

Size of wildfires in the Euro-Mediterranean region: observations and theoretical analysis

  
Natural Hazards and Earth System Science, Vol. 15, No. 6. (23 June 2015), pp. 1331-1341, https://doi.org/10.5194/nhess-15-1331-2015

Abstract

MODIS (Moderate Resolution Imaging Spectroradiometer) satellite observations of fire size and ERA-Interim meteorological reanalysis are used to derive a relationship between burnt area and wind speed over the Mediterranean region and Eastern Europe. The largest wildfire size does not show a strong response with respect to wind speed in Eastern Europe. In the Mediterranean, as intuitively expected, the burnt area associated with the largest wildfires is an increasing function of wind speed for moderate temperature anomalies. In situations of severe heatwaves, ...

 

Newly discovered landscape traps produce regime shifts in wet forests

  
Proceedings of the National Academy of Sciences, Vol. 108, No. 38. (20 September 2011), pp. 15887-15891, https://doi.org/10.1073/pnas.1110245108

Abstract

We describe the “landscape trap” concept, whereby entire landscapes are shifted into, and then maintained (trapped) in, a highly compromised structural and functional state as the result of multiple temporal and spatial feedbacks between human and natural disturbance regimes. The landscape trap concept builds on ideas like stable alternative states and other relevant concepts, but it substantively expands the conceptual thinking in a number of unique ways. In this paper, we (i) review the literature to develop the concept of landscape ...

 

Passing the point of no return

  
Science, Vol. 354, No. 6316. (02 December 2016), pp. 1109-1109, https://doi.org/10.1126/science.aal2188

Abstract

[Excerpt] In the field of ecology, regime shifts are massive changes in function and character that occur when an ecosystem passes a tipping point. Regime shifts sometimes have severe consequences for human well-being through losses of ecosystem services, including desertification in arid regions and marine fisheries collapses. These changes are difficult to predict and sometimes impossible to reverse. For these reasons, understanding how to anticipate and prevent regime shifts is one of the most important challenges faced by environmental scientists. [\n] Theoretical analyses ...

 

Bistability, spatial interaction, and the distribution of tropical forests and savannas

  
Ecosystems (2016), pp. 1-12, https://doi.org/10.1007/s10021-016-0011-1

Abstract

Recent work has indicated that tropical forest and savanna can be alternative stable states under a range of climatic conditions. However, dynamical systems theory suggests that in case of strong spatial interactions between patches of forest and savanna, a boundary between both states is only possible at conditions in which forest and savanna are equally stable, called the ‘Maxwell point.’ Frequency distributions of MODIS tree-cover data at 250 m resolution were used to estimate such Maxwell points with respect to the ...

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