Interspecific hybridization can generate functional novelty in cichlid fish.

Area of Science:

• Evolutionary biology
• Ecology
• Genetics

Background:

• The evolutionary impact of interspecific hybridization is debated.
• Hybridization may facilitate ecological novelty or hinder performance in parental niches.
• Context-dependency of hybridization's evolutionary consequences is key.

Purpose of the Study:

• To test if hybrids between ecologically distinct cichlids perform differently in parental vs. novel food niches.
• To investigate the ecological context-dependency of hybridization's evolutionary effects in animals.

Main Methods:

• Generated first-generation hybrid crosses between ecologically distinct African cichlid species.
• Conducted feeding efficiency experiments comparing hybrids and parental species.
• Tested performance on food types representing parental niches and novel niches.

Main Results:

• Hybrids showed higher feeding efficiencies on novel food types.
• Hybrids generally had lower feeding efficiencies on parental food types compared to parents.
• Hybridization generated functional variation relevant to accessing new resources.

Conclusions:

• Interspecific hybridization can generate ecologically relevant functional variation.
• Supports the hypothesis of ecological context-dependency in hybridization's evolutionary impact.
• Highlights hybridization's role in niche expansion and adaptive radiation.