Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Mate Choice01:20

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.
Background and Environment Affect Phenotype02:27

Background and Environment Affect Phenotype

Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

A male-biased sex ratio increases the opportunity for precopulatory sexual selection but does not change the Bateman gradient.

Evolution letters·2025
Same author

A novel sperm-derived seminal fluid protein in Caenorhabditis nematodes.

Journal of evolutionary biology·2025
Same author

Why the Long "Horns"? Fine-Scale Morphology Suggests Tactile Demands Contributed to the Exaggeration of Male Longhorned Beetle Antennae (Coleoptera: Cerambycidae).

Ecology and evolution·2025
Same author

A shared developmental genetic basis for sexually antagonistic male and female adaptations in the toothed water strider.

Evolution letters·2025
Same author

The resolution of evolutionary conflicts within species.

Proceedings. Biological sciences·2024
Same author

Ecology, the pace-of-life, epistatic selection and the maintenance of genetic variation in life-history genes.

Molecular ecology·2023
Same journal

Chronic limb loading results in remarkable load carriage economy in growing fowl.

Proceedings. Biological sciences·2026
Same journal

Motion-from-structure in face perception: expectations of natural face motion depend on face shape.

Proceedings. Biological sciences·2026
Same journal

Unification and generalization of models of zygote survival.

Proceedings. Biological sciences·2026
Same journal

Phenological type- and diameter-dependent effects of individual light availability and interannual climate variation on tree growth.

Proceedings. Biological sciences·2026
Same journal

Interaction range of common goods shapes Black Queen dynamics beyond the cheater-cooperator narrative.

Proceedings. Biological sciences·2026
Same journal

Stingray spine diversity reflects performance trade-offs linked to puncture and breakability.

Proceedings. Biological sciences·2026
See all related articles

Related Experiment Video

Updated: Jun 12, 2026

Effect of Male Accessory Gland Products on Egg Laying in Gastropod Molluscs
15:19

Effect of Male Accessory Gland Products on Egg Laying in Gastropod Molluscs

Published on: June 22, 2014

Condition-dependent ejaculate size and composition in a ladybird beetle.

Jennifer C Perry1, Locke Rowe

  • 1Department of Ecology and Evolutionary Biology, University of Toronto, 25 Willcocks Street, Toronto, Ontario, Canada. jen.perry@utoronto.ca

Proceedings. Biological Sciences
|June 25, 2010
PubMed
Summary
This summary is machine-generated.

Male ejaculate traits vary with condition. Low-condition males produced ejaculates with proportionally more sperm, demonstrating the first experimental evidence of condition-dependent ejaculate composition shifts.

More Related Videos

At-Risk Butterfly Captive Propagation Programs to Enhance Life History Knowledge and Effective Ex Situ Conservation Techniques
07:10

At-Risk Butterfly Captive Propagation Programs to Enhance Life History Knowledge and Effective Ex Situ Conservation Techniques

Published on: February 11, 2020

Rearing and Long-Term Maintenance of Eristalis tenax Hoverflies for Research Studies
10:50

Rearing and Long-Term Maintenance of Eristalis tenax Hoverflies for Research Studies

Published on: May 19, 2018

Related Experiment Videos

Last Updated: Jun 12, 2026

Effect of Male Accessory Gland Products on Egg Laying in Gastropod Molluscs
15:19

Effect of Male Accessory Gland Products on Egg Laying in Gastropod Molluscs

Published on: June 22, 2014

At-Risk Butterfly Captive Propagation Programs to Enhance Life History Knowledge and Effective Ex Situ Conservation Techniques
07:10

At-Risk Butterfly Captive Propagation Programs to Enhance Life History Knowledge and Effective Ex Situ Conservation Techniques

Published on: February 11, 2020

Rearing and Long-Term Maintenance of Eristalis tenax Hoverflies for Research Studies
10:50

Rearing and Long-Term Maintenance of Eristalis tenax Hoverflies for Research Studies

Published on: May 19, 2018

Area of Science:

  • Reproductive biology
  • Sexual selection
  • Animal behavior

Background:

  • Male ejaculate traits are influenced by resource availability.
  • Theory suggests males in good condition produce larger ejaculates, but composition varies with costs and sperm competition risk.
  • Previous insect studies show condition-dependent ejaculate size, but not composition shifts.

Purpose of the Study:

  • To investigate the condition dependence of ejaculate composition in ladybird beetles.
  • To determine if males adjust ejaculate component allocation based on their resource state.
  • To provide experimental evidence for shifts in ejaculate composition related to male condition.

Main Methods:

  • Manipulated adult male condition in Adalia bipunctata.
  • Analyzed three ejaculate components: sperm, non-sperm ejaculate, and spermatophore capsule.
  • Quantified ejaculate size and sperm content in relation to male condition.

Main Results:

  • High-condition males transferred larger ejaculates, possibly via increased transfer rate.
  • High-condition males allocated less to sperm compared to low-condition males.
  • Low-condition males transferred ejaculates with proportionally and absolutely more sperm.

Conclusions:

  • Demonstrates the first experimental evidence for condition-dependent shifts in ejaculate composition.
  • Male condition influences not only ejaculate size but also the relative allocation to sperm.
  • Findings support theories on the adaptive plasticity of reproductive traits under varying resource availability.