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Related Concept Videos

Trophic Levels01:35

Trophic Levels

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All organisms in an ecosystem occupy a trophic level in the food chain. The lowest level consists of primary producers, which synthesize their food from either solar or chemical energy. Each subsequent level obtains energy from the levels below. Detritivores can occupy any of the levels above primary producers.
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Soil Microbial Ecology01:29

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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...
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The Soil Ecosystem02:23

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Plants obtain inorganic minerals and water from the soil, which acts as a natural medium for land plants. The composition and quality of soil depend not only on the chemical constituents but also on the presence of living organisms. In general, soils contain three major components:
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Microbial Mats01:25

Microbial Mats

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Microbial communities forming biofilms and mats represent complex, spatially structured ecosystems where metabolic processes are stratified according to light, oxygen, and nutrient gradients. Biofilms are initial colonization stages, only a few millimeters thick, while mature microbial mats can reach centimeter-scale thickness and display intricate vertical organization. Their structural and functional heterogeneity allows microorganisms to occupy distinct ecological niches within a few...
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What are Biogeochemical Cycles?00:54

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The most common elements in organic molecules, carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, are only available in the ecosystem in limited amounts. Therefore, these nutrients must be recycled through both biotic and abiotic components of the ecosystem, in processes generally called biogeochemical cycles.
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The Nitrogen Cycle01:49

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Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of nitrogen on Earth is nitrogen gas, which cannot be used by most animals and plants. Thus, nitrogen gas must first be converted into a usable form by nitrogen-fixing bacteria before it can be cycled through other living organisms. The use of nitrogen-containing fertilizers and animal waste products in human agriculture has greatly influenced the...
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Related Experiment Video

Updated: Apr 20, 2026

Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter
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[Trophic chains in soil].

A A Goncharov, A V Tiunov

    Zhurnal Obshchei Biologii
    |December 3, 2014
    PubMed
    Summary

    Soil animals utilize diverse energy sources, including dead organic matter and microorganisms. Understanding these trophic links is crucial for soil health and global carbon cycling.

    Area of Science:

    • Soil Ecology
    • Ecosystem Dynamics
    • Biogeochemical Cycles

    Background:

    • Soil animal trophic links are diverse and flexible, impacting ecosystem functions through ecological engineering.
    • Understanding energy sources for soil animals is vital for comprehending soil community structure and carbon cycling.

    Purpose of the Study:

    • To evaluate the relative importance of detritus, microorganisms, and recent photosynthate as energy sources for soil animals.
    • To investigate the feeding habits of endogeic macrofauna on stabilized soil organic matter.
    • To assess the role of soil food webs in ecosystem-level processes and carbon cycling.

    Main Methods:

    • Synthesis of published data and original research findings.
    • Analysis of trophic interactions within soil detritus-based food chains.

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  • Examination of energy flow through different soil animal communities.

    • Main Results:

    • Dead organic matter and saprotrophic microorganisms are primary energy sources, but recent photosynthate also contributes.
    • Soil food webs are compartmentalized, challenging a simple bacteria-vs-fungi channel dichotomy.
    • Mobile predators integrate local food webs, influencing litter decomposition rates.

    Conclusions:

    • Soil animal feeding habits and energy sources are complex and interconnected.
    • Top-down trophic interactions play a role in regulating decomposition, with predators acting as key integrators.
    • Further research is needed to fully elucidate the role of soil fauna in carbon cycling.