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Related Concept Videos

Microbial Interactions: Predation01:28

Microbial Interactions: Predation

Microbial predation refers to the process by which one microorganism kills and consumes another to obtain nutrients and energy. It encompasses both bacterial and protozoan predators. This interaction plays a crucial role in shaping microbial communities and regulating nutrient cycling.Bacterial Predators: Epibiotic vs. EndobioticBacterial predators are classified based on their mode of attack as either epibiotic or endobiotic. Epibiotic predators, such as Vampirococcus, attach to the surface of...
Predator-Prey Interactions02:39

Predator-Prey Interactions

Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.Although predation is commonly associated with carnivory, for...
Symbiosis00:58

Symbiosis

Symbiotic relationships are long-term, close interactions between individuals of different species that affect the distribution and abundance of those species. When a relationship is beneficial to both species, this is called mutualism. When the relationship is beneficial to one species but neither beneficial nor harmful to the other species, this is called commensalism. When one organism is harmed to benefit another, the relationship is known as parasitism. These types of relationships often...
Trophic Efficiency00:46

Trophic Efficiency

Trophic level transfer efficiency (TLTE) is a measure of the total energy transfer from one trophic level to the next. Due to extensive energy loss as metabolic heat, an average of only 10% of the original energy obtained is passed on to the next level. This pattern of energy loss severely limits the possible number of trophic levels in a food chain.
Microbial Interactions: Parasitism01:22

Microbial Interactions: Parasitism

Parasitism is a form of microbial interaction in which parasitic microbes exploit a host organism for nutrients and shelter, often at the host's expense. Unlike mutualistic relationships, where both organisms benefit, parasitism benefits only the parasite and harms the host.Classification of ParasitesMicrobial parasites are broadly classified based on their location relative to the host.Ectoparasites remain on the host’s surface, such as the skin or outer tissues, drawing nutrients...
Trophic Levels01:35

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.

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Updated: Jun 5, 2026

Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter
10:20

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

Published on: March 12, 2013

Intraguild predation: The dynamics of complex trophic interactions.

G A Polis1, R D Holt

  • 1Gary Polls is at the Dept of Biology, Vanderbilt University, Nashville, TN 37235, USA.

Trends in Ecology & Evolution
|January 18, 2011
PubMed
Summary
This summary is machine-generated.

Intraguild predation (IGP), where competing species prey on each other, significantly impacts ecological communities. Understanding IGP is crucial for reconsidering niche shifts, species exclusion, and applied conservation efforts.

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Last Updated: Jun 5, 2026

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10:20

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Published on: March 12, 2013

Laboratory Protocol for Genetic Gut Content Analyses of Aquatic Macroinvertebrates Using Group-specific rDNA Primers
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Area of Science:

  • Ecology
  • Community Ecology
  • Food Web Dynamics

Background:

  • Ecological community structure is shaped by competition and predation.
  • Potentially competing species often engage in predator-prey interactions, a phenomenon termed intraguild predation (IGP).

Purpose of the Study:

  • To explore the ecological implications of intraguild predation (IGP).
  • To re-evaluate classical ecological concepts like niche shifts and species exclusion in light of IGP.

Main Methods:

  • Theoretical modeling of IGP systems.
  • Analysis of field studies investigating IGP dynamics.

Main Results:

  • IGP systems can exhibit alternative stable states.
  • Intermediate predators in IGP systems may possess superior exploitative competition abilities.
  • Field studies generally support theoretical expectations of IGP.

Conclusions:

  • Intraguild predation (IGP) offers a novel perspective on community structure.
  • IGP has significant implications for understanding niche dynamics, species interactions, and food web stability.
  • IGP is relevant to applied ecological issues, including species conservation and fisheries management.