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Related Concept Videos

Mate Choice01:20

Mate Choice

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Mate choice—the decision about whom to mate with—is a type of natural selection, since animals must reproduce to pass down their genes. Mate choice is also called intersexual selection because the behavior occurs between the sexes.
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Taste Buds and Receptors01:20

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Gustation, or the sense of taste, is intrinsically linked to the anatomical structures located on the tongue. This organ's surface, along with the entirety of the oral cavity, is adorned with stratified squamous epithelium. Evident on the tongue are elevated structures known as papillae (singular = papilla), which house the mechanisms for the transduction of gustatory stimuli. Four distinct types of papillae exist, each identified by their unique morphological attributes: the circumvallate,...
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Gustation01:43

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Gustation is a chemical sense that, along with olfaction (smell), contributes to our perception of taste. It starts with the activation of receptors by chemical compounds (tastants) dissolved in the saliva. The saliva and filiform papillae on the tongue distribute the tastants and increase their exposure to the taste receptors.
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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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Natural Selection and Mating Preferences01:06

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The principle of natural selection posits that organisms better adapted to their environment are more likely to survive and reproduce. This principle is closely intertwined with mating preferences, a key aspect of sexual selection, which evolutionary psychologists believe is driven by instincts to propagate one's genes. Such instincts significantly influence mating behaviors and preferences between genders.
Females, due to their biological roles in conception, pregnancy, and nursing,...
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The Physiology of Taste01:24

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The perception of a salty flavor is facilitated by sodium ions within the oral salivary fluid. Upon consumption of a salty substance, salt crystals disassemble, leading to the liberation of its constituents—Na+ and Cl- ions. These ions subsequently dissolve into the salivary fluid present in the oral cavity. The external environment of the gustatory cells experiences an elevation in Na+ concentration, thereby establishing a potent concentration gradient. This gradient propels the...
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Taste Preference Assay for Adult Drosophila
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Gustatory polymorphism mediates a new adaptive courtship strategy.

Ayako Wada-Katsumata1, Eduardo Hatano1, Coby Schal1

  • 1Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC 27695, USA.

Proceedings. Biological Sciences
|March 29, 2023
PubMed
Summary

German cockroaches evolved glucose aversion to resist baits, but this created mating problems. Males evolved faster courtship and altered gifts to overcome females’ aversion, restoring reproductive success.

Keywords:
German cockroachaversioncourtshipevolutiongustationnuptial gift

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Area of Science:

  • Evolutionary biology
  • Animal behavior
  • Insect physiology

Background:

  • Human-imposed selection drives adaptive changes in sensory traits.
  • Rapid sensory evolution can create behavioral conflicts, necessitating compensatory mechanisms.
  • German cockroaches evolved glucose aversion (GA) to resist glucose-based insecticide baits.

Purpose of the Study:

  • Investigate the consequences of GA on cockroach courtship and mating behavior.
  • Identify adaptive traits in GA males that compensate for female GA.
  • Determine the genetic independence of male compensatory traits from the GA trait.

Main Methods:

  • Comparative analysis of GA and wild-type German cockroach strains.
  • Recombinant line analysis to assess genetic associations.
  • Behavioral observations of courtship and mating interactions.

Main Results:

  • GA females dismount courting males due to glucose production from maltose hydrolysis, reducing mating success.
  • GA males evolved increased maltotriose production (resilient to glucosidases) and faster courtship initiation.
  • The male compensatory traits were not genetically linked to the glucose aversion trait.

Conclusions:

  • Compensatory evolution in male German cockroaches restored mating success despite female glucose aversion.
  • Courtship trait evolution in males was driven by altered female behavior, independent of male GA.
  • Behavioral adaptations can resolve sensory conflicts arising from rapid adaptive evolution, maintaining fitness.