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Related Experiment Video

Updated: May 22, 2025

A Protocol for Laboratory Housing of Turquoise Killifish Nothobranchius furzeri

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When Rivals Are Absent: Male Aggression Towards Females in Bluefin Killifish.

Ratna Karatgi¹, Rebecca C Fuller²

¹Program in Ecology Evolution, and Conservation Urbana Illinois USA.

Ecology and Evolution

|March 14, 2025

Summary

This summary is machine-generated.

Reproductive costs in bluefin killifish are driven by male aggression towards females, not male-male competition. When males lack rivals, they increase harassment of females, impacting survival.

Keywords:

aggression killifish sex ratio sexual conflict spillover territoriality

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Area of Science:

Behavioral Ecology
Reproductive Strategies
Animal Behavior

Background:

Reproductive costs are significant in many species.
Behavioral interactions, including competition and harassment, are key drivers of these costs.
Understanding the drivers of reproductive costs is crucial for evolutionary biology.

Purpose of the Study:

To investigate the primary drivers of reproductive costs in the bluefin killifish (Lucania goodei).
To differentiate between male-male competition, female-female competition, and male-female interactions as sources of reproductive costs.
To examine the role of sex ratio and density on aggressive behaviors and mortality.

Main Methods:

Experimental manipulation of sex ratios (1:1, 1:3, 3:1, 3:3) and densities.
Observation and quantification of aggressive behaviors in both sexes.
Monitoring of mortality rates across different treatment groups.

Main Results:

Female mortality was higher than male mortality.
Male aggression towards females (chases) and female mortality peaked in single-male treatments.
Male-male aggression was observed but often resolved through signaling; female-female aggression was minimal.

Conclusions:

In bluefin killifish, male-female interactions, specifically male aggression towards females, are the primary drivers of reproductive costs.
The absence of male rivals intensifies male harassment of females.
These findings explain female post-spawning behavior, such as joining mixed-species shoals.