Related Experiment Video
Updated: May 11, 2025
10:14
Author Spotlight: Leaf Trait Analysis for Climate and Ecology Reconstruction in Modern and Ancient Plant Communities
Published on: October 25, 2024
3.5K
Fire-driven alternative vegetation states across the temperate Andes.
Diego P Ramírez1,2,3, Sergio A Estay1,4, Alejandro Miranda5,6,7
1Instituto de Ciencias Ambientales y Evolutivas, Universidad Austral de Chile, Valdivia, Los Ríos, Chile.
Summary
Fire-driven alternative stable states (AVS) in temperate Andes show that shrublands thrive with increased fire activity, while forests persist in its absence. This study confirms fire-vegetation feedbacks maintain these distinct ecosystems.
Area of Science:
- Ecology
- Ecosystem Dynamics
- Fire Ecology
Background:
- Terrestrial ecosystems can exist in alternative stable states (AVS) under similar environmental conditions, maintained by contrasting feedback processes.
- In the temperate Andes, Nothofagus forests and shrublands are hypothesized as fire-driven AVS, with fire frequency dictating stability.
Purpose of the Study:
- To determine the extent of environmental condition overlap between Nothofagus forests and shrublands in the temperate Andes.
- To investigate the role of fire regimes in explaining the distribution patterns of these alternative vegetation states.
Main Methods:
- Utilized global environmental databases and local fire data to assess environmental niche overlap.
- Estimated fire activity at a micro-basin scale using the percentage of cumulative burned area (PBA) as an indicator.
Main Results:
- Nothofagus forests and shrublands exhibited over 70% environmental niche overlap.
- Shrubland prevalence increased with higher PBA, indicating fire activity favors their persistence.
- Fire-vegetation feedbacks were confirmed to promote shrubland stability.
Conclusions:
- Provided broad-scale evidence for fire-driven AVS in temperate ecosystems outside the tropics.
- The findings support the hypothesis that fire regimes are critical in maintaining alternative stable states in Nothofagus ecosystems.
Related Concept Videos
01:57Adaptations that Reduce Water Loss
25.0K
Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
25.0K
02:45Responses to Heat and Cold Stress
13.2K
Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
13.2K
01:16What is Climate?
18.1K
Climate refers to the prevailing weather conditions in a specific area over an extended period. As the saying goes, “Climate is what you expect. Weather is what you get.” Climate is influenced by geographic factors, such as latitude, terrain, and proximity to bodies of water.
18.1K
01:50Global Climate Change
23.9K
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
23.9K
01:27C4 Pathway and CAM
45.0K
Most plants use the C3 pathway for carbon fixation. However, some plants, such as sugar cane, corn, and cacti that grow in hot conditions, use alternative pathways to fix carbon and conserve energy loss due to photorespiration. Photorespiration is the process that occurs when the oxygen concentration is high. Under such conditions, the rubisco enzyme in the Calvin cycle binds O2 instead of CO2, which halts photosynthesis and consumes energy.
C4 Pathway
The C4 pathway is used by plants such as...
C4 Pathway
The C4 pathway is used by plants such as...
45.0K
02:29Hybrid Zones
16.6K
Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.
16.6K