Related Experiment Video
Updated: Jun 22, 2026
09:55
Observation and Quantification of Mating Behavior in the Pinewood Nematode, Bursaphelenchus xylophilus
Published on: December 25, 2016
Mate availability contributes to maintain the mixed-mating system in a scolytid beetle
Daphna Gottlieb1, J P Holzman, Y Lubin
1Department of Life Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel. gdaphna@bgu.ac.il
Journal of Evolutionary Biology
|June 6, 2009
Summary
The study on Coccotrypes dactyliperda beetles reveals a mixed-mating system. High inbreeding likely results from mate scarcity, not preference, suggesting a reproductive assurance strategy.
Area of Science:
- Evolutionary Biology
- Population Genetics
- Behavioral Ecology
Background:
- The beetle Coccotrypes dactyliperda exhibits life history traits suggesting a mixed-mating system.
- Understanding mating systems is crucial for predicting population genetic structure and evolutionary trajectories.
Purpose of the Study:
- To investigate the mating system and population genetic structure of Coccotrypes dactyliperda.
- To determine the factors contributing to the observed high inbreeding levels in this species.
Main Methods:
- Analysis of genetic structure across seven populations in Israel.
- Laboratory experiments assessing female mating preferences between inbred and outbred males.
Main Results:
- Significant deviations from Hardy-Weinberg equilibrium and excess homozygosity were observed.
- Inbreeding coefficients varied significantly, indicating some level of outbreeding.
- Females showed a delay in mating with same-population males (inbreeding) compared to different-population males (outbreeding).
Conclusions:
- Coccotrypes dactyliperda possesses a mixed-mating system.
- High inbreeding appears to be driven by a shortage of outbreeding mates (reproductive assurance) rather than a preference for inbreeding.
- The findings highlight the ecological factors influencing mating system stability in natural populations.
Related Concept Videos
01:20Mate 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.
01:09Mutation, Gene Flow, and Genetic Drift
In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).Mechanisms of Genetic VariationThe original sources of genetic variation are mutations,...
01:17Understanding Species and Reproductive Barriers
A species is a group of organisms that interbreed and produce fertile offspring. Typically, individuals of the same species appear similar and share common characteristics due to their highly similar genomes. However, not all organisms that look alike are members of the same species. Various mechanisms keep most species discrete. While some mechanisms prevent reproductive behavior and fertilization (pre-zygotic isolation), others prevent the production of fertile offspring after mating has...
02:29Hybrid Zones
Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.Gene flow and natural selection are evolutionary mechanisms that shape the outcome of a hybrid zone. Gene flow...
01:46Types 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...
01:32What is Natural Selection?
Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.The Theory of Natural...