Monarch butterfly conservation through male germplasm cryo

What this paper is about

The IUCN listed the migratory monarch as endangered in 2022. This study developed a protocol for freezing and storing monarch sperm, so that genetic material survives even if populations do not.

It is insurance rather than conservation, and it works on the male side only.

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

Abstract

Monarch butterfly (Danaus plexippus L.) populations have declined in North America. The International Union for Conservation of Nature (IUCN) recently classified the species as endangered, sparking public concern and conservation efforts. Our approach to conservation is through cryopreservation of germinal cells and tissue. The goal of this study was to develop a cryopreservation protocol for monarch spermatozoa to ensure successful long-term storage. Cryopreserved sperm cells would provide a reserve of monarch germplasm, which could be utilized in the event of population loss. In this study, sperm cell bundles collected from male monarch butterflies were cryopreserved in a cryoprotective medium and stored in liquid nitrogen. To determine the post-cryopreservation sperm cell viability, a subsample of preserved sperm bundles were thawed rapidly, and their viability was qualified using a sperm live/dead stain. We are presenting a protocol to preserve and store genetic material and viable sperm bundles of the monarch butterfly. To date, this is the first report of successful cryopreservation of monarch germplasm which sets the foundation for cryostorage and could be extensible to other vulnerable lepidopterans.

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

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APA

Milkweed USA. (2026). Monarch butterfly conservation through male germplasm cryopreservation (listing). Retrieved DATE, from https://milkweedusa.com/research/monarch-butterfly-conservation-through-male-germplasm-cryopreservation-2024/

MLA

"Monarch butterfly conservation through male germplasm cryopreservation (listing)." Milkweed USA, 2026, https://milkweedusa.com/research/monarch-butterfly-conservation-through-male-germplasm-cryopreservation-2024/. Accessed DATE.

Chicago

Milkweed USA. "Monarch butterfly conservation through male germplasm cryopreservation (listing)." Last modified 2026-08-01. Accessed DATE. https://milkweedusa.com/research/monarch-butterfly-conservation-through-male-germplasm-cryopreservation-2024/.

BibTeX

@misc{milkweedusa_researchmonarchbutterflycons,
  title  = {Monarch butterfly conservation through male germplasm cryopreservation (listing)},
  author = {{Milkweed USA}},
  year   = {2026},
  url    = {https://milkweedusa.com/research/monarch-butterfly-conservation-through-male-germplasm-cryopreservation-2024/},
  note   = {Accessed DATE}
}