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PERFORMANCE OF TADPOLES FROM THE HYBRIDOGENETIC RANA ESCULENTA COMPLEX: INTERACTIONS WITH POND DRYING AND
Raymond D Semlitsch1, Heinz-Ulrich Reyer1
1Institute of Zoology, University of Zurich, CH-8057, Zurich, SWITZERLAND.
Summary
Hybridogenetic frog tadpole performance varied by genotype (LL, LR, RR) and environment. RR genotype showed the lowest survival, while LR tadpoles performed better in harsh conditions, impacting population dynamics.
Area of Science:
- Herpetology
- Evolutionary Biology
- Ecology
Background:
- Hybridogenetic systems in amphibians involve complex mating and genetic inheritance.
- Understanding genotype performance under varying environmental pressures is crucial for population dynamics.
Purpose of the Study:
- To assess the performance of three tadpole genotypes (LL, LR, RR) from a hybrid mating system.
- To determine the impact of interspecific competition and pond drying on tadpole growth, development, and survival.
- To evaluate the relative fitness of offspring across different environmental conditions.
Main Methods:
- Tadpoles of three genotypes (LL, LR, RR) were reared in artificial ponds under controlled conditions.
- Environmental variables included interspecific competition and pond drying (simulating harsh conditions).
- Performance metrics included survival, growth, development time, and metamorphosis success.
Main Results:
- The RR genotype exhibited the lowest survival, growth, and development across all conditions.
- Competition and pond drying reduced body size and increased metamorphosis time for LL and LR genotypes.
- Metamorphosis success varied by genotype and environmental conditions; RR genotype failed to metamorphose.
Conclusions:
- The hybridogenetic system's population dynamics are influenced by mate choice and oviposition site selection.
- LR genotype shows increased performance in harsh conditions, while RR genotype performance is poor even in favorable conditions.
- Environmental factors significantly impact the fitness and reproductive success of different genotypes in this hybrid system.
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