Sire attractiveness influences offspring performance in guppies

Area of Science:

• Evolutionary biology
• Animal behavior
• Genetics

Background:

• The good-genes hypothesis posits that females select mates with superior genes to enhance offspring viability.
• Maternal effects can complicate the link between male attractiveness and offspring quality.
• Artificial insemination bypasses female mate choice, isolating paternal genetic effects.

Purpose of the Study:

• To investigate the association between paternal coloration and anti-predator behavior in newborn guppies (Poecilia reticulata).
• To determine if male attractiveness (coloration) influences offspring's inherited genetic quality.

Main Methods:

• Artificial insemination was used to control for female choice and maternal effects.
• Virgin female guppies were inseminated with sperm from males with varying orange pigmentation.
• Offspring anti-predator behaviors (schooling, predator response, evasion time) were assessed.

Main Results:

• Paternal coloration did not significantly affect offspring schooling or swimming speed.
• Offspring from more colorful sires showed a significantly greater ability to evade capture.
• This suggests a genetic link between male secondary sexual traits and offspring anti-predator performance.

Conclusions:

• Paternal genotype, indicated by secondary sexual traits like coloration, influences offspring anti-predator behavior.
• The study provides evidence for the good-genes hypothesis in guppy anti-predator behavior.
• This research highlights the role of sexual selection in shaping offspring survival traits.