MaryAnn Lepp was thrilled to witness a surge in monarch butterflies in her garden, with a remarkable 20 caterpillars feeding on her swamp milkweed in just one day this week. This increase in butterfly activity is part of a larger trend observed by numerous Canadian monarch enthusiasts, who are noticing a boom in backyard milkweed patches across the Prairie region due to the wet and hot conditions this summer.
The heightened butterfly activity, including the emergence of chrysalises and monarch cocoons, has sparked excitement among observers like Lepp in La Broquerie, located southeast of Winnipeg. Conservation experts acknowledge the surge but cannot definitively attribute it to the favorable weather conditions. Nevertheless, the increase in caterpillars, chrysalises, and monarch butterflies is seen as a positive development for the federally endangered species known for their annual migration between Canada and Mexico.
Marika Olynyk, curator of the Living Prairie Museum, noted a significant rise in monarch sightings in Winnipeg, attributing it to the presence of native plants that pollinators love, including various milkweed species. While monarch butterflies primarily feed on nectar from milkweed flowers, they also consume other flowering plants like the meadow blazing star. However, during the caterpillar stage, monarchs exclusively feed on milkweed leaves.
Despite efforts by individuals like Lepp to plant milkweed and native wildflowers, these plants are not as abundant as they once were due to habitat loss caused by the conversion of native grasslands into farmland. Olynyk emphasized that habitat loss remains the biggest threat to monarchs, highlighting the drastic reduction of the tallgrass prairie that used to cover a significant portion of North America.
Monarchs were officially classified as endangered by the Committee on the Status of Endangered Wildlife in Canada in 2016, prompting the federal government to implement protective measures in December 2023. While awareness and conservation efforts have increased, Olynyk cautioned that the monarch population is still below sustainable levels, emphasizing the ongoing need for preservation initiatives.
In addition to monarchs, the Assiniboine Park Zoo has witnessed an uptick in the population of the critically endangered Poweshiek skipperling butterfly, which faces even greater risks of extinction. The zoo has been breeding and releasing Poweshiek skipperlings in an attempt to bolster their numbers, with recent sightings indicating progress towards recovery.
As conservation efforts continue, zoo staff are gearing up to assist monarchs by fitting them with radio transmitters to track their migration south to Mexico. Enthusiasts like Lepp remain dedicated to safeguarding caterpillars and chrysalises, emphasizing the importance of environmental conservation and coexistence with nature in preserving these delicate species.