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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...
Optimal Foraging00:48

Optimal Foraging

How animals obtain and eat their food is called foraging behavior. Foraging can include searching for plants and hunting for prey and depends on the species and environment.
Epiphytes, Parasites, and Carnivores02:40

Epiphytes, Parasites, and Carnivores

Plants often form mutualistic relationships with soil-dwelling fungi or bacteria to enhance their roots’ nutrient uptake ability. Root-colonizing fungi (e.g., mycorrhizae) increase a plant’s root surface area, which promotes nutrient absorption. While root-colonizing, nitrogen-fixing bacteria (e.g., rhizobia) convert atmospheric nitrogen (N2) into ammonia (NH3), making nitrogen available to plants for various biological functions. For example, nitrogen is essential for the biosynthesis of the...
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...
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.
Defenses Against Pathogens and Herbivores02:26

Defenses Against Pathogens and Herbivores

Plants present a rich source of nutrients for many organisms, making it a target for herbivores and infectious agents. Plants, though lacking a proper immune system, have developed an array of constitutive and inducible defenses to fend off these attacks.

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Related Experiment Video

Updated: Jul 17, 2026

Agarose Microchambers for Long-term Calcium Imaging of Caenorhabditis elegans
07:51

Agarose Microchambers for Long-term Calcium Imaging of Caenorhabditis elegans

Published on: June 24, 2015

When carnivores are "full and lazy".

Jonathan M Jeschke1

  • 1Section of Evolutionary Ecology, Department Biology II, Ludwig-Maximilians-University, Munich, Germany. jonathan.jeschke@gmx.net

Oecologia
|February 13, 2007
PubMed
Summary

Carnivores often meet their daily energy needs, reaching satiation and avoiding time constraints. This suggests that food availability frequently exceeds the minimum required for carnivore survival and activity.

Area of Science:

  • Ecology
  • Animal Behavior
  • Physiology

Background:

  • Animals require energy and nutrients to survive, influencing their daily activity patterns.
  • Carnivores, in particular, face challenges in securing sufficient food resources.

Purpose of the Study:

  • To investigate whether carnivores typically meet their energetic needs within a 24-hour period.
  • To determine if carnivores are often released from time constraints related to foraging.

Main Methods:

  • Development of a model to predict the minimum food abundance for carnivore satiation and release from time constraints.
  • Analysis of literature data for five invertebrate and vertebrate species to assess field food abundances.
  • Comparison of energetic demands with kill rates for 16 bird and mammal species.

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Assaying Predatory Feeding Behaviors in Pristionchus and Other Nematodes

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Main Results:

  • Field food abundances often exceed the predicted threshold for carnivore satiation.
  • Carnivores reach satiation in 88% of analyzed bird and mammal species based on energetic demands and kill rates.
  • These findings indicate carnivores are frequently not limited by time for foraging.

Conclusions:

  • Carnivores commonly achieve satiation, suggesting food resources are often abundant.
  • The release from time constraints implies carnivores may have more flexibility in time allocation beyond foraging.
  • This challenges the assumption that carnivores are perpetually constrained by the need to find food.