Hybrid effects in field populations of the African monarch

What this paper is about

Hybrid vigour and hybrid breakdown are usually measured by crossing known parents in a laboratory, which leaves open whether the effects matter in the wild.

The African monarch has colour forms with known genetics that also control wing length, so the authors could measure these effects in a natural contact zone as well as in the laboratory.

Summarised here from the abstract below. Not the authors’ words.

Abstract

Heterosis, Haldane and Bateson-Dobzhansky-Muller effects have been widely documented amongst a range of plants and animals. However, typically these effects are shown by taking parents of known genotype into the laboratory and measuring components of the F1 progeny under laboratory conditions. This leaves in doubt the real significance of such effects in the field. Here we use the well-known colour pattern genotypes of the African monarch or queen (Danaus chrysippus), which also control wing length, to test these effects both in the laboratory and in a contact zone in the field. By measuring the wing lengths in animals of known colour pattern genotype we show clear evidence for all three hybrid effects at the A and BC colour patterning loci, and importantly, that these same effects persist in the same presumptive F1s when measured in hybrid populations in the field. This demonstrates the power of a system in which genotypes can be directly inferred in the field and highlights that all three hybrid effects can be seen in the East African contact zone of this fascinating butterfly.

Abstract reproduced from the published paper, which is licensed CC BY. Copyright remains with the authors.

Key terms

MigrationClimate changeBody sizeReticulate evolutionHEterosisspeciationNon-random MatingWing LengthAsymmetric CrossingBateson-Dobzhansky-Muller EffectHaldane Rule Effect

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APA

Milkweed USA. (2026). Hybrid effects in field populations of the African monarch butterfly, Danaus chrysippus (L.) (Lepidoptera: Nymphalidae) (listing). Retrieved DATE, from https://milkweedusa.com/research/hybrid-effects-in-field-populations-of-the-african-monarch-2021/

MLA

"Hybrid effects in field populations of the African monarch butterfly, Danaus chrysippus (L.) (Lepidoptera: Nymphalidae) (listing)." Milkweed USA, 2026, https://milkweedusa.com/research/hybrid-effects-in-field-populations-of-the-african-monarch-2021/. Accessed DATE.

Chicago

Milkweed USA. "Hybrid effects in field populations of the African monarch butterfly, Danaus chrysippus (L.) (Lepidoptera: Nymphalidae) (listing)." Last modified 2026-08-01. Accessed DATE. https://milkweedusa.com/research/hybrid-effects-in-field-populations-of-the-african-monarch-2021/.

BibTeX

@misc{milkweedusa_researchhybrideffectsinfield,
  title  = {Hybrid effects in field populations of the African monarch butterfly, Danaus chrysippus (L.) (Lepidoptera: Nymphalidae) (listing)},
  author = {{Milkweed USA}},
  year   = {2026},
  url    = {https://milkweedusa.com/research/hybrid-effects-in-field-populations-of-the-african-monarch-2021/},
  note   = {Accessed DATE}
}