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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...
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Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.However, realistic environmental conditions limit the number of...
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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...
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Populations are groups of individuals of the same species that inhabit a shared environment. Communities include multiple co-existing, interacting populations of different species. Metapopulations span multiple populations of the same species that occupy different areas. Metapopulations interact through immigration and emigration, providing genetic diversity that lends resilience to harsh environments. Population size and density can be estimated using quadrat and mark and recapture...
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Organisms must balance energy intake with the energy required for growth, maintenance, and reproduction. These trade-offs result in a variety of survivorship and reproductive strategies, including semelparity and iteroparity. Semelparous species reproduce only once in their lifetime, often investing most available resources into that single reproductive event. Iteroparous species, by contrast, reproduce multiple times over their lifetimes, typically allocating fewer resources to any single...
Conservation of Declining Populations02:07

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Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.

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Related Experiment Video

Updated: Jun 4, 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

Interactions between predation and resources shape zooplankton population dynamics.

Alice Nicolle1, Lars-Anders Hansson, Jakob Brodersen

  • 1Institute of Ecology/Limnology, Lund University, Lund, Sweden. Alice.nicolle@limnol.lu.se

Plos One
|February 10, 2011
PubMed
Summary
This summary is machine-generated.

Zooplankton populations collapse under high fish predation, but can recover with ample algae resources. Fish predation and spring algae blooms interact to regulate zooplankton dynamics.

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Area of Science:

  • Ecology
  • Aquatic Ecology
  • Population Dynamics

Background:

  • Ecological studies traditionally focus on predation or resources separately.
  • Interactions between predation and resource availability in population dynamics are less understood.

Purpose of the Study:

  • To investigate the individual and interactive effects of juvenile fish predation and algal resource availability on zooplankton population dynamics.
  • To determine how roach (Rutilus rutilus) predation and varying algal concentrations influence zooplankton.
  • To explore the implications of these interactions for ecological regulation.

Main Methods:

  • An enclosure experiment was designed to simulate natural aquatic conditions.
  • Zooplankton were exposed to a controlled gradient of roach predation at different algal concentrations.
  • Population dynamics were monitored under these varying conditions.

Main Results:

  • High predation pressure from juvenile fish led to zooplankton population collapse, regardless of algal resource levels.
  • At lower predation levels, increased algal resources buffered zooplankton against fish predation.
  • The interplay between fish density and resource availability significantly impacted zooplankton survival and abundance.

Conclusions:

  • Interactions between fish mass-hatching and spring algal resource fluctuations are key regulators of zooplankton populations.
  • Global warming-induced increases in spring temperatures may alter the timing of these ecological interactions, affecting zooplankton dynamics in spring and summer.