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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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Frequency-dependent Selection

When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
Enhanced Elimination of Poison01:26

Enhanced Elimination of Poison

Poison can be effectively removed from the gastrointestinal (GI) tract through various decontamination procedures.
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Renal excretion is the...
Evolutionary Psychology01:20

Evolutionary Psychology

Evolutionary psychology explores the origins of human behavior and mental processes by framing them within the context of natural selection, a theory famously propounded by Charles Darwin. This field asserts that many behaviors common across human societies — ranging from instinctive fear reactions to complex social interactions — arose as evolutionary adaptations. These adaptations enhanced the survival and reproductive success of our ancestors, thereby becoming embedded in the human psyche...
Dose-Response Relationship: Selectivity and Specificity01:25

Dose-Response Relationship: Selectivity and Specificity

Drugs exert their therapeutic effects by interacting with receptors, enzymes, or ion channels that are present throughout the human body. The strength and duration of the interaction between a drug and its target receptor are characterized by the selectivity and specificity of the drug. Selectivity refers to a drug's strong preference for its intended target over other targets. For instance, isoprenaline, a non-selective β-adrenergic agonist, interacts with both β1- and β2-adrenergic receptors...
Genetics of Speciation02:16

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.

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Related Experiment Video

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Harvesting Venom Toxins from Assassin Bugs and Other Heteropteran Insects
09:45

Harvesting Venom Toxins from Assassin Bugs and Other Heteropteran Insects

Published on: April 21, 2018

The venom optimization hypothesis revisited.

David Morgenstern1, Glenn F King

  • 1Institute for Molecular Bioscience, The University of Queensland, 306 Carmody Road, St. Lucia, QLD 4072, Australia.

Toxicon : Official Journal of the International Society on Toxinology
|December 26, 2012
PubMed
Summary
This summary is machine-generated.

Animal venom is metabolically expensive, leading to frugal use strategies in many species. This review explores evidence for venom economy across diverse venom systems.

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Extraction of Venom and Venom Gland Microdissections from Spiders for Proteomic and Transcriptomic Analyses
10:25

Extraction of Venom and Venom Gland Microdissections from Spiders for Proteomic and Transcriptomic Analyses

Published on: November 3, 2014

Area of Science:

  • Zoology
  • Biochemistry
  • Evolutionary Biology

Background:

  • Animal venoms are complex mixtures of proteins and other compounds, serving crucial roles in predation and defense.
  • The production of venom is metabolically costly, implying evolutionary pressures to minimize its expenditure.

Purpose of the Study:

  • To review evidence for economical venom use in animals with both ancient and recently evolved venom systems.
  • To investigate the relationship between venom's metabolic cost and observed usage behaviors.

Main Methods:

  • Literature review of studies on venom economy in various animal taxa.
  • Analysis of behavioral data related to venom expenditure.
  • Examination of biochemical complexity and functional redundancy in venom.

Main Results:

  • Convergent evidence across multiple taxa supports the existence of evolutionary pressures favoring frugal venom use.
  • Behaviors consistent with "venom metering" or "venom optimization" are observed.
  • A dichotomy exists between economical venom use and the biochemical complexity/redundancy of venom.

Conclusions:

  • Evolutionary pressures strongly favor the economical use of venom in animals.
  • Biochemical optimization may explain the complex composition of venoms despite frugal use.
  • Further research is needed to fully resolve the paradox of venom complexity and economical expenditure.