Related Experiment Video
Updated: Feb 9, 2026
10:19
A CO2 Concentration Gradient Facility for Testing CO2 Enrichment and Soil Effects on Grassland Ecosystem Function
Published on: November 21, 2015
11.9K
Moderate patchiness optimizes heterogeneity, stability, and beta diversity in mesic grassland
Devan Allen McGranahan1, Torre J Hovick1, Robert Dwayne Elmore2
1School of Natural Resource Sciences-Range Science Program North Dakota State University Fargo North Dakota.
Ecology and Evolution
|June 8, 2018
Summary
Creating patchy vegetation through fire management in grasslands enhances biodiversity and biomass stability. Optimal rangeland management involves burning 25-33% of the area in 3-4 patches every 3-4 years.
Area of Science:
- Rangeland Ecology and Management
- Fire Ecology
- Conservation Biology
Background:
- Heterogeneous disturbance patterns are crucial for rangeland conservation, promoting biodiversity and stable biomass production.
- Pyrodiversity, or fire variability, can enhance ecosystem heterogeneity, but the drivers are not fully understood.
- The fire-grazing interaction (pyric herbivory) in mesic grasslands links fire to trophic dynamics.
Purpose of the Study:
- To investigate how fire size, season, and frequency influence spatial heterogeneity and temporal variability in grazed tallgrass prairies.
- To determine optimal fire patch dynamics for enhancing rangeland ecological processes.
- To bridge the gap between pyrodiversity theory and applied rangeland management practices.
Main Methods:
- Studied grazed tallgrass prairie landscapes under varying fire regimes (patch size, season, frequency).
- Utilized analyses sensitive to nonlinear trends to assess ecological responses.
- Measured spatial heterogeneity, temporal variability in aboveground biomass, and plant functional group beta diversity.
Main Results:
- Maximum spatial heterogeneity and beta diversity, with minimum temporal variability, occurred with 3-4 patches (25-33% burned) and 3-4 year fire return intervals.
- Beta diversity positively correlated with spatial heterogeneity and negatively with temporal variability.
- Season of fire did not significantly impact outcomes.
Conclusions:
- Fire patch number and frequency interact to influence rangeland productivity and management outcomes.
- Moderate landscape burning (25-33%) with strategic patch management is key for enhancing heterogeneity and stability.
- Future research should focus on fire frequency and a broader seasonal burn window, rather than season of fire.
Related Concept Videos
03:18Nuclear Stability
23.3K
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together...
To hold positively charged protons together...
23.3K
01:53RNA Stability
35.8K
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
35.8K
01:30Diversity of Archaea I
669
Archaea, a domain of single-celled microorganisms, are classified into five major phyla based on genetic and biochemical characteristics: Euryarchaeota, Crenarchaeota, Thaumarchaeota, Korarchaeota, and Nanoarchaeota. Among these, the phylum Euryarchaeota is notable for its remarkable diversity in morphology, metabolism, and ecological adaptations.Morphological and Metabolic DiversityMembers of Euryarchaeota exhibit a variety of cellular shapes, including rods and cocci. Their metabolic pathways...
669
01:13Cell Diversity
5.1K
The concept of a cell started with microscopic observations of dead cork tissue by Robert Hooke in 1665. Hooke coined the term "cell" based on the resemblance of the small subdivisions in the cork to the rooms that monks inhabited, called cells. About ten years later, Antonie van Leeuwenhoek became the first person to observe the living and moving cells under a microscope. In the century that followed, the theory that cells represented the basic unit of life developed.
Multicellular...
Multicellular...
5.1K
01:24Diversity of Archaea II
532
Archaea, one of the three domains of life, exhibit remarkable diversity and adaptability, thriving in both extreme and moderate environments. Historically, most identified archaea have been classified into two major phyla: Euryarchaeota and Crenarchaeota. However, recent molecular studies have expanded this classification to include three additional phyla: Thaumarchaeota, Nanoarchaeota, and Korarchaeota, each exhibiting unique characteristics and ecological roles.Thaumarchaeota: Mesophiles...
532
01:15Diversity of Protists I
1.2K
Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...
1.2K