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Related Experiment Video

Updated: Aug 19, 2025

Assessing Differences in Sperm Competitive Ability in Drosophila

Assessing Differences in Sperm Competitive Ability in Drosophila

Published on: August 22, 2013

Species divergence under competition and shared predation.

Marius Roesti^1,2, Jeffrey S Groh^2,3, Stephanie A Blain²

¹Division of Evolutionary Ecology, Institute of Ecology and Evolution, University of Bern, Bern, Switzerland.

Ecology Letters

|November 30, 2022

Summary

This summary is machine-generated.

Competing species facing shared predators can evolve differently. This study shows threespine stickleback and prickly sculpin diverged in antipredator traits due to asymmetric ecological character displacement.

Keywords:

adaptive divergence asymmetric interactions biotic selection character displacement sculpin species interactions stickleback

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Area of Science:

Ecology
Evolutionary Biology
Behavioral Ecology

Background:

Species interactions, including competition and predation, are key drivers of evolution.
Shared predation's impact on competing species' divergence is less understood than competition's.
Ecological character displacement can occur when species interact, leading to trait divergence.

Discussion:

This study empirically investigated how shared predation influences the evolution of competing prey species.
Threespine stickleback and prickly sculpin, co-existing with a trout predator, were compared in sympatric and allopatric populations.
Antipredator and trophic phenotypes were analyzed to understand evolutionary responses to shared predation.

Key Insights:

Sympatric stickleback and sculpin showed divergent antipredator traits.
Stickleback increased antipredator adaptations, while sculpin decreased them in sympatry.
Divergent shifts in feeding morphology, diet, and habitat use were primarily driven by stickleback evolution.

Outlook:

Asymmetric ecological character displacement influenced vulnerability to shared predation.
This indirect effect led to the divergence of antipredator traits between sympatric stickleback and sculpin.
Further research can explore the long-term consequences of such asymmetric evolutionary responses.