Kin distribution of amphibian larvae in the wild.

Area of Science:

• Behavioral Ecology
• Evolutionary Biology
• Amphibian Research

Background:

• Kin selection theory predicts that an individual's proximity to relatives influences fitness.
• Anuran larvae are frequently studied for kin recognition and association in laboratory settings.
• Identifying family groups in wild anuran larvae has historically limited field research.

Purpose of the Study:

• To investigate wild wood frog (Rana sylvatica) tadpole distribution relative to kin.
• To determine if tadpoles exhibit kin aggregation or repulsion in natural environments.
• To provide empirical evidence for context-dependent kin selection in non-reproductive wild animals.

Main Methods:

• Microsatellite analysis was employed to identify familial relationships among tadpoles.
• Tadpole distribution patterns were analyzed in two natural pond environments.
• Statistical methods were used to assess nonrandom distribution with respect to siblings and half-siblings.

Main Results:

• Wood frog tadpoles displayed nonrandom distribution in relation to their relatives in both ponds.
• In one pond, tadpoles showed significant clumping with siblings/half-siblings, consistent with lab findings.
• In the second pond, tadpoles exhibited significant dispersal from siblings/half-siblings, the first observed kin repulsion in wild non-reproductive animals.

Conclusions:

• Kin distribution in wood frog tadpoles is context-dependent, varying between ponds.
• This study provides the first evidence of kin repulsion in wild, non-reproductive animals.
• Findings underscore the importance of studying kin selection hypotheses in natural settings to understand ecological relevance.