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Types of Selection01:46

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Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
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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.
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Natural Selection and Adaptation01:15

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Natural selection, a fundamental concept in evolutionary biology, is the mechanism by which evolution is driven, favoring organisms that are best adapted to their environments. This process enhances their chances of survival and reproduction. Adaptation, a key outcome of this process, involves genetic modifications that optimize an organism's functionality under specific environmental challenges, such as extreme cold or thinner air at high altitudes.
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Mate Choice01:20

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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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Limits to Natural Selection01:38

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Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.
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Do sexually selected weapons drive diversification?

Zachary Emberts1, John J Wiens1

  • 1Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, Arizona, 85721.

Evolution; International Journal of Organic Evolution
|March 19, 2021
PubMed
Summary
This summary is machine-generated.

Male-male competition, often involving sexually selected weapons, does not appear to increase speciation or diversification rates in insects. This study examined three insect clades, finding no evidence linking these traits to higher evolutionary rates.

Keywords:
Diversificationfemale choiceinsectsmale-male competitionsexual selectionspeciationweapons

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Area of Science:

  • Evolutionary Biology
  • Zoology
  • Entomology

Background:

  • Sexual selection is hypothesized to drive speciation and diversification, primarily through female choice.
  • Male-male competition is another significant sexual selection mechanism, but its role in diversification remains under-investigated.
  • Previous research has predominantly focused on female choice, overlooking the impact of male-male competition on evolutionary rates.

Purpose of the Study:

  • To investigate the impact of precopulatory male-male competition, specifically sexually selected weapons, on speciation and diversification rates in insects.
  • To test the hypothesis that male-male competition promotes evolutionary diversification.
  • To provide empirical evidence on the role of male-male competition in insect evolution.

Main Methods:

  • Comparative phylogenetic analyses were conducted on three insect clades: leaf-footed and broad-headed bugs (Coreidae+Alydidae), stick insects (Phasmatodea), and scarab beetles (Scarabaeoidea).
  • Rates of speciation and diversification were compared between lineages possessing sexually selected weapons and those without.
  • Phylogenetic trees and species counts were utilized to assess evolutionary patterns.

Main Results:

  • No significant evidence was found linking the presence of sexually selected weapons to increased speciation rates across the studied insect clades.
  • Diversification rates did not differ between weapon-bearing and weaponless lineages within Coreidae+Alydidae, Phasmatodea, and Scarabaeoidea.
  • The results indicate that precopulatory male-male competition may not be a general driver of diversification in insects.

Conclusions:

  • Precopulatory male-male competition, as exemplified by sexually selected weapons, does not appear to be a strong, general factor promoting speciation and diversification in insects.
  • The findings challenge the broad assumption that all forms of sexual selection equally drive evolutionary rates.
  • Further research may be needed to explore other mechanisms of male-male competition or sexual selection in driving insect diversification.