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Related Concept Videos

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...
Ecological Disturbance02:26

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...
Ecological Niches02:02

Ecological Niches

All organisms have a position within an ecosystem. The complete set of living and nonliving factors—including food resources, climate, and terrain—that define the position of a given organism are collectively referred to as the organism’s ecological niche.Multiple species cannot occupy the exact same niche within their habitat. If the niches of two or more species overlap to a large extent, the competitive exclusion principle dictates that one species will outcompete the other, forcing it to...
Habitat Fragmentation02:31

Habitat Fragmentation

Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition.
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...
Distribution and Dispersion00:54

Distribution and Dispersion

Ecology is the study of how organisms interact with their environment and with one another. An important aspect of ecology is understanding where species are found and how individuals are distributed within those areas. The geographic range of a species refers to the total area where its members are located, while dispersion describes the pattern of spacing of individuals within that range.Geographic Range and Dispersion PatternsWithin a species’ geographic range, individuals may be distributed...

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Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter
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Predator diversity and ecosystem functioning: density modifies the effect of resource partitioning.

John N Griffin1, Kate L de la Haye, Stephen J Hawkins

  • 1Marine Biological Association of the United Kingdom, The Laboratory, Citadel Hill, Plymouth PL 2PB United Kingdom. john.griffin@plymouth.ac.uk

Ecology
|April 16, 2008
PubMed
Summary

In diverse ecosystems, increasing predator diversity enhances resource capture efficiency, especially at higher predator densities. This occurs because predators utilize distinct functional niches, leading to greater overall prey consumption.

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Area of Science:

  • Ecology
  • Marine Biology
  • Ecosystem Functioning

Background:

  • The relationship between biodiversity and ecosystem functioning is established, but mechanistic understanding is lacking.
  • Predator-prey interactions and resource partitioning are key to understanding biodiversity-function relationships.
  • Previous studies often used simplified systems, limiting insights into diverse food webs.

Purpose of the Study:

  • To investigate the effects of predator diversity and density on secondary resource capture efficiency in a species-rich intertidal food web.
  • To explore the independent and interactive impacts of diversity and density on ecosystem functioning.
  • To provide a mechanistic explanation for observed biodiversity effects through resource partitioning.

Main Methods:

  • Manipulation of a species-rich intertidal food web, varying predator diversity and total predator density.
  • Assessment of secondary resource capture efficiency under different diversity and density treatments.
  • Quantification of species-specific resource use through prey consumption patterns in monocultures.

Main Results:

  • Predator diversity significantly enhanced resource capture efficiency, but only at high predator densities.
  • Mixed-species predator treatments more than doubled the resource capture rate compared to the best single-species treatment.
  • Evidence of distinct functional niches among predator species was observed through differential prey consumption.

Conclusions:

  • Predator diversity can substantially boost ecosystem functioning (resource capture) when competitive interactions are intensified at higher densities.
  • Resource partitioning, driven by species occupying unique functional niches, provides a mechanistic basis for biodiversity-ecosystem functioning links.
  • Findings highlight the importance of considering both diversity and density in complex food webs for predicting ecosystem performance.