Related Experiment Video
Updated: Oct 21, 2025
08:16
Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity
Published on: March 13, 2014
19.1K
Diversity begets diversity during community assembly until ecological limits impose a diversity ceiling
Magdalena San Roman1,2, Andreas Wagner1,2,3,4
1Department of Evolutionary Biology and Environmental Studies, University of Zurich, Zurich, Switzerland.
Molecular Ecology
|September 3, 2021
Summary
Microbial communities initially grow diverse through species interactions creating new niches. However, environmental limitations eventually dominate, stabilizing microbial diversity.
Area of Science:
- Microbial Ecology
- Community Assembly
- Metabolic Modeling
Background:
- Microbial diversity is vast, but the drivers of its assembly and limits remain unclear.
- Two main hypotheses explain diversity limits: ecological limits (resources) and diversity-begets-diversity (biotic interactions creating niches).
Purpose of the Study:
- To determine which hypothesis better explains microbial community assembly.
- To investigate the roles of species invasions and extinctions in microbial diversity dynamics.
Main Methods:
- Utilized metabolic modeling to represent microbial species' biochemical reactions and resource utilization.
- Simulated thousands of species invasions in a chemostat-like environment to model community assembly.
- Analyzed how metabolic by-products influence nutrient availability and niche creation.
Main Results:
- Early community assembly is characterized by 'diversity begets diversity,' where by-product excretion creates numerous new niches.
- This interaction-driven niche creation significantly expands the environment's capacity to support diverse species.
- Later stages show a slowdown in niche creation, niche saturation, and a plateau in species diversity due to ecological limitations.
Conclusions:
- Both the ecological limits and diversity-begets-diversity hypotheses explain different stages of microbial community assembly.
- Species interactions can dramatically increase diversity ceilings, but this effect is ultimately constrained by environmental factors.
- Understanding these dynamics is crucial for predicting microbial community structure and function.
Related Concept Videos
02:26Ecological Disturbance
18.2K
An ecological disturbance is a temporary disruption in the environment resulting from abiotic, biotic, or anthropogenic factors, causing a pronounced change in an ecosystem. The impact of an ecological disturbance, which can depend on its intensity, frequency, and spatial distribution, plays a significant role in shaping the species diversity within the ecosystem.
18.2K
01:38Limits to Natural Selection
33.0K
Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.
33.0K
01:19What is Biodiversity?
29.3K
Biodiversity describes the variety of living things at multiple organizational levels: genetic, species and ecosystem diversity. Species diversity includes all branches of the evolutionary tree from single-celled prokaryotic organisms, bacteria, and archaea, to the eukaryotic kingdoms: plants; animals; fungi; and protists. To date, there have been about 1.75 million species identified, and new species are discovered every week.
29.3K
01:27Diversity of Protists IV
482
Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...
482
01:27Diversity of Protists II
521
Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
521
01:27Diversity of Protists III
468
Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
468