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Trophic Levels

Trophic Levels

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.

Ecological Disturbance

Ecological Disturbance

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.Ecological disturbances can be caused by an event as small as the trampling of underbrush to an incident as wide-ranging as a forest...

Primary Production

Primary Production

The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.

What are Biogeochemical Cycles?

What are Biogeochemical Cycles?

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.

Sources of Food Contamination

Sources of Food Contamination

Contamination of food by microbial agents and natural toxins poses significant risks to public health. These hazards can be introduced at various points across the food supply chain, ranging from environmental sources to processing and storage stages. Understanding these contamination pathways is critical for developing strategies to ensure food safety.Seafood is particularly vulnerable to contamination through both environmental exposure and microbial colonization. Toxins from harmful algal...

Freshwater Microbial Ecology

Freshwater Microbial Ecology

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 systems...

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Related Experiment Video

Updated: Jun 11, 2026

Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter

Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter

Published on: March 12, 2013

Nutrient flows between ecosystems can destabilize simple food chains.

Justin N Marleau¹, Frédéric Guichard, François Mallard

¹Department of Biology, McGill University, 1205 ave Docteur Penfield, Montréal, Québec, Canada H3A 1B1. justin.marleau@mail.mcgill.ca

Journal of Theoretical Biology

|July 6, 2010

Summary

Nutrient diffusion destabilizes ecosystems by altering trophic dynamics. Nutrient recycling and ecosystem enrichment modify this effect, highlighting meta-ecosystem theory for predicting species persistence.

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Last Updated: Jun 11, 2026

Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter

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Published on: March 12, 2013

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Published on: October 29, 2016

Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures

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Published on: January 7, 2019

Area of Science:

Ecology
Meta-ecosystem dynamics
Population and community stability

Background:

Organism dispersal significantly impacts population and community dynamics.
Metacommunity theory often overlooks the influence of nutrient flows between ecosystems.
Understanding nutrient transport is crucial for predicting ecological stability.

Purpose of the Study:

To investigate how nutrient diffusion and recycling affect trophic dynamics in a spatially coupled meta-ecosystem.
To analyze the impact of nutrient transport on regional and local stability, and spatial-temporal synchrony.
To elucidate the role of ecosystem enrichment in nutrient-induced instabilities.

Main Methods:

Development and analysis of a meta-ecosystem model with two spatially coupled autotroph-consumer communities.
Modeling nutrient diffusion as the spatial coupling mechanism.
Analysis of stability (regional and local) and spatiotemporal synchrony.

Main Results:

Nutrient diffusion can induce asynchronous destabilization of local communities via spatiotemporal bifurcations.
Nutrient recycling modulates the impact of nutrient diffusion on meta-ecosystem stability.
The interaction between nutrient recycling and diffusion is dependent on the level of ecosystem enrichment.

Conclusions:

Nutrient diffusion and recycling are critical factors influencing ecological stability and species persistence.
Meta-ecosystem theory provides a valuable framework for predicting species distribution in managed ecosystems.
Spatiotemporal dynamics driven by nutrient transport can lead to unexpected community destabilization.