Sexual Selection Traits in Sepsis Punctum Flies Across Continents

Data from a study comparing pre- and post-copulatory investment in nine populations of the dung fly Sepsis punctum across Europe and North America. The dataset supports analysis of a continental reversal in sexual size dimorphism, with European populations showing male-biased size and North American populations showing female-biased size. It includes measurements related to mating behavior, testes size, spermathecal size, and body morphology.

Use Cases

• Analyze the relationship between body size and testes size hyper-allometry across European and North American populations.
• Compare re-mating rates and mounting attempt frequencies between continents to study pre-copulatory investment strategies.
• Investigate the correlation between sexual size dimorphism (SSD) reversal and the presence of abdominal courtship displays in North American populations.
• Examine relative spermathecal size in females from different populations for evidence of co-evolution with male reproductive morphology.

Strengths

• Data spans nine distinct populations from two continents, enabling cross-continental comparative analysis.
• Focuses on a clear biological phenomenon: a reversal of sexual size dimorphism between continents.
• Investigates multiple reproductive traits, including behavioral (mating rates, mounting attempts) and morphological (testes size, spermathecal size) measures.

Limitations

• Sample sizes for each of the nine populations are not specified, limiting assessment of statistical power.
• The dataset is static, representing a specific snapshot from a published study with no ongoing updates.
• Geographic coverage is limited to four European and five North American populations, not a global sample.

Provenance

Source

Dryad digital repository.

Collection Method

Comparative study of allopatric fly populations, measuring behavioral and morphological traits.

Freshness

Last updated in 2020.

Geography

Populations in Europe and North America.