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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.
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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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Diversity of Protists II01:27

Diversity of Protists II

Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
Diversity of Protists IV01:27

Diversity of Protists IV

Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...
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Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...

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Related Experiment Video

Updated: May 9, 2026

JenaTron - An Experimental Approach to Study the Effects of Plant History and Soil History on Grassland Ecosystem Functioning
09:23

JenaTron - An Experimental Approach to Study the Effects of Plant History and Soil History on Grassland Ecosystem Functioning

Published on: March 21, 2025

Consumer diversity interacts with prey defenses to drive ecosystem function.

Douglas B Rasher1, Andrew S Hoey, Mark E Hay

  • 1School of Biology, Georgia Institute of Technology, Atlanta, Georgia 30332, USA.

Ecology
|August 8, 2013
PubMed
Summary
This summary is machine-generated.

Herbivore diversity is crucial for coral reef health. Greater fish diversity leads to better macroalgal control, preventing algal overgrowth and supporting coral resilience.

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Last Updated: May 9, 2026

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

Published on: October 5, 2017

Area of Science:

  • Marine ecology
  • Coral reef ecosystems
  • Fisheries science

Background:

  • Macroalgae compete with corals for space on tropical reefs.
  • Herbivorous fishes control macroalgal abundance, maintaining coral dominance.
  • The role of herbivore diversity and specific prey traits in this process is unclear.

Purpose of the Study:

  • To investigate how herbivore diversity and identity influence macroalgal abundance on Fijian coral reefs.
  • To understand the relationship between macroalgal defenses and herbivore feeding preferences.
  • To assess the impact of herbivory on coral reef resilience.

Main Methods:

  • Compared fish biomass, species richness, and coral cover in fished areas versus no-take marine reserves.
  • Transplanted macroalgae to assess consumption rates and herbivore feeding behavior.
  • Recorded herbivorous fish feeding activity and analyzed dietary overlap and complementarity.

Main Results:

  • Protected reefs had significantly higher herbivore biomass, species richness, and coral cover.
  • Fished reefs showed greater macroalgal abundance and species richness.
  • Four key herbivore species consumed 97% of macroalgae, with distinct dietary preferences linked to algal defenses.

Conclusions:

  • Herbivore diversity is essential for effective macroalgal control on coral reefs.
  • Dietary complementarity among herbivores, driven by tolerance to algal defenses, enhances ecosystem function.
  • Maintaining herbivore diversity is critical for coral reef resilience and health.