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Natural Selection and Mating Preferences

Natural Selection and Mating Preferences

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, inherently...

Types of Selection

Types of Selection

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...

Mate Choice

Mate Choice

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.

Frequency-dependent Selection

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.Positive Frequency-Dependent SelectionIn positive...

Speciation Rates

Speciation Rates

Speciation can proceed at markedly different rates, and evolutionary biologists commonly describe these differences through the models of gradualism and punctuated equilibrium. Both patterns explain how new species arise, but they differ in the tempo and continuity of evolutionary change. In both cases, evolutionary change arises from heritable variation within populations, with natural selection often shaping traits that improve survival and reproduction under specific environmental conditions.

Genetics of Speciation

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.The genetics of speciation involves the different traits or isolating mechanisms preventing gene exchange, leading to reproductive isolation. Reproductive isolation can be due to reproductive barriers that have effects either before or after the formation of a zygote. Pre-zygotic mechanisms prevent fertilization from occurring, and post-zygotic mechanisms...

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Visually Sexing Loggerhead Shrike (Lanius Ludovicianus) Using Plumage Coloration and Pattern

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Spatial and temporal dynamics in a sexual selection mosaic.

Thomas P Gosden¹, Erik I Svensson

¹Department of Animal Ecology, Ecology Building, Lund University, S-223 62 Lund, Sweden. Thomas.Gosden@zooekol.lu.se

Evolution; International Journal of Organic Evolution

|January 16, 2008

Summary

Sexual selection on damselfly body size varied spatially in a mosaic pattern, not clinally. This sexual selection mosaic was driven by local female densities and body sizes, influencing male traits.

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Area of Science:

Evolutionary Biology
Behavioral Ecology
Population Genetics

Background:

Selective pressures can vary geographically, leading to either smooth clinal changes or unpredictable mosaic patterns in phenotypic traits.
Biotic interactions, including sexual selection, can drive fine-grained spatial variation in selective regimes, potentially creating selection mosaics.
Understanding the spatial organization of selection is crucial for predicting evolutionary trajectories.

Purpose of the Study:

To investigate the temporal variation and spatial organization of sexual selection on male body size in the polymorphic damselfly Ischnura elegans.
To examine how sexual selection on male body size changes along a coastal-inland ecological gradient.
To determine if sexual selection follows a clinal pattern or a mosaic-like spatial organization.

Main Methods:

Studied sexual selection on male body size in Ischnura elegans along a coastal-inland gradient.
Analyzed body size variation and its correlation with sexual selection regimes across different populations.
Assessed spatial autocorrelation and the influence of female color morph densities and body sizes on sexual selection.

Main Results:

Male body size exhibited a clinal increase from coast to inland areas.
Sexual selection regimes on male body size showed fine-grained spatial organization, lacking a clinal pattern and exhibiting low spatial autocorrelation.
Sexual selection varied in sign and magnitude, driven by local densities of female color morphs and female body sizes.

Conclusions:

The spatial organization of sexual selection on male body size in Ischnura elegans is best described as a sexual selection mosaic.
This mosaic pattern is influenced by localized, density- and frequency-dependent social interactions involving female traits.
Fine-grained spatial variation in biotic interactions can lead to complex, non-clinal patterns of selection.