Related Experiment Video
Updated: May 5, 2026
10:20
Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter
Published on: March 12, 2013
13.7K
Moderate changes in nutrient input alter tropical microbial and protist communities and belowground linkages
Valentyna Krashevska1, Dorothee Sandmann1, Mark Maraun1
1J.F. Blumenbach Institute of Zoology and Anthropology, Georg August University Göttingen, Göttingen, Germany.
The ISME Journal
|November 29, 2013
Summary
Increased nitrogen and phosphorus deposition in tropical soils significantly alters microbial communities and testate amoebae. These changes impact ecosystem functions like decomposition and plant growth, especially at higher altitudes.
Area of Science:
- Tropical ecology
- Soil science
- Microbiology
Background:
- Anthropogenic activities are increasing nutrient deposition in ecosystems globally.
- Tropical ecosystems play a crucial role in global biogeochemical cycles.
- Understanding soil microbial responses to nutrient changes is vital for predicting ecosystem stability.
Purpose of the Study:
- To investigate the effects of nitrogen (N) and phosphorus (P) addition on soil microbial communities and testate amoebae in tropical ecosystems.
- To determine how altitude and duration of nutrient addition influence these responses.
- To explore the impact of nutrient changes on grazer-prey relationships within soil ecosystems.
Main Methods:
- Experimental nutrient addition (N, P, and N+P) along an altitudinal transect.
- Monitoring changes in microbial biomass (MB) and community structure.
- Assessing alterations in testate amoebae community structure and their relationship with microbial communities.
Main Results:
- Nutrient additions significantly altered MB and community structures of both microorganisms and testate amoebae.
- Microbial responses varied with altitude and duration of nutrient addition.
- Nitrogen generally limited microorganisms, while phosphorus also limited saprotrophic fungi; arbuscular mycorrhizal fungi benefited from N and/or P. Testate amoebae benefited from N but were negatively impacted by P.
Conclusions:
- Soil microbial decomposer systems in tropical montane rainforests are highly sensitive to moderate nutrient deposition changes.
- Nutrient additions can lead to significant ecosystem-wide ramifications, affecting litter decomposition and plant growth.
- Testate amoeba communities are primarily structured by abiotic factors and microbial interactions, not solely prey availability.
Related Concept Videos
01:30Marine Microbial Ecology
74
Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...
74
01:29Soil Microbial Ecology
86
Soil microbial ecology is defined by highly diverse, spatially structured communities that drive nutrient cycling, organic matter turnover, and overall ecosystem stability. Although a gram of soil can contain thousands of bacterial and archaeal taxa, the ecological processes they mediate are even more crucial for sustaining terrestrial life.Microhabitats and NichesSoil is a heterogeneous mixture of minerals, organic matter, water, and air. Microbes inhabit distinct microhabitats formed by...
86
01:27Microbes and Climate Change
100
Microorganisms are pivotal agents in Earth's biogeochemical cycles, significantly influencing climate dynamics through their metabolic activities. These microbes modulate the levels of key greenhouse gases by both contributing to and helping mitigate climate change.Microbial Contributions to Greenhouse Gas EmissionsRising global temperatures accelerate microbial metabolism, which, in turn, speeds up the decomposition of organic matter. This process releases carbon dioxide (CO₂) through...
100
01:09Microbe-Plant Interactions
155
Microbe-plant interactions represent a dynamic spectrum of associations shaped by intricate chemical signaling. These interactions can be neutral, beneficial, or detrimental, and profoundly influence plant physiology, growth, and ecosystem function. The plant microbiome, comprising bacteria, fungi, archaea, protists, and viruses, plays a pivotal role in mediating these effects through surface colonization, internal colonization, or systemic symbiosis.Mutualistic associations, particularly with...
155
01:24Freshwater Microbial Ecology
66
Freshwater systems such as streams, rivers, and lakes exhibit distinct physical and biological characteristics that influence their microbial communities. These environments are broadly categorized into lotic systems—those with flowing waters like streams and most rivers—and lentic systems, which include still or slow-moving waters such as lakes, ponds, and marshes.In lentic systems, phytoplankton drive primary production, generating autochthonous organic carbon. In contrast, lotic...
66
01:22Microenvironments
61
Microorganisms inhabit highly localized spaces known as microenvironments, which are defined by distinct physical and chemical characteristics. These include oxygen concentration, pH, temperature, light availability, and nutrient levels. The conditions within a microenvironment can differ markedly from those in the surrounding area and significantly influence microbial growth, metabolism, and community structure.Microenvironments often display sharp physicochemical gradients over small spatial...
61