ASYMMETRIC COMPETITION IN MIXED POPULATIONS OF TADPOLES OF THE HYBRIDOGENETIC: RANA ESCULENTA COMPLEX

Area of Science:

• Evolutionary Biology
• Amphibian Ecology
• Genetics

Background:

• Hybridogenetic species like Rana esculenta exhibit
• general-purpose
• genotypes, suggesting broad environmental tolerance.

Purpose of the Study:

• To investigate the competitive ability of hemiclonal hybrid Rana esculenta tadpoles in relation to their parental species, Rana lessonae.

Main Methods:

• Tadpoles of R. esculenta and R. lessonae were reared in mixed and single-genotype populations across three densities in artificial ponds.

Main Results:

• Rana esculenta tadpoles showed higher survival and a greater percentage of metamorphosis, especially at higher densities, compared to R. lessonae.
• Hybrid tadpoles exhibited enhanced metamorphosis rates in mixed populations, outperforming single-genotype populations at high densities.
• Survival, body size, and larval period were not significantly affected by population density or genotype mixing.

Conclusions:

• The results support the
• general-purpose
• genotype hypothesis for hybridogenetic frogs, indicating competitive superiority rather than reduced ability.
• Hybridogenetic success in Rana esculenta challenges assumptions of trade-offs between generality and competitive ability in asexual lineages.