The GT Pulse has an in-depth interview with Cyndie Roach if the GT Butterfly House and Zoo in Williamsburg outlining the generation spanning migration of the monarch butterfly from the Oyamel fir forests of Mexico to Michigan:
…They fly over the Gulf with their first stop being in the Texas panhandle area.
“They land there, take a break, and breed by the millions, lay eggs, and then they die. That super generation has lived all winter and is now ready to make that trip to Texas. So that first generation born in the United States will know to start flying north when they’re born.”
The entire butterfly birthing process takes 30 days. Part of the inherent will to go north has to do with milkweed. It’s the plant that signals them home.
“It’s the single host plant, meaning the caterpillar needs to eat it to become a butterfly. They’re looking for milkweed to lay their eggs on. We don’t even have Milkweed growing yet in the early parts of spring. It doesn’t come up until May and June, so what’s great is that as our spring comes on and things start to get warmer, that’s what’s welcoming the monarch to the area.”
The second generation of monarchs that were born in Texas makes it to the midline of the States, roughly around the Rocky Mountains where their babies will be born, and like their parents and grandparents before them – they’ll know to keep flying north.
“By the time they reach us we’re looking at the third generation typically. So it’s their grandchildren we’re now seeing arrive in Michigan.”
Remember that milkweed Cyndie was talking about? Northern Michigan provides milkweed that some of those third-generation monarchs will use to lay their own eggs. So the butterflies that are going back down to Mexico are the fourth generation of those first butterflies coming from the Oyamel fir forests.
“That’s why it’s so important that we as Michiganders, specifically up here in Northern Michigan, provide as much milkweed habitat as we can for these amazing creatures. We play such an important role, because not only are we the ones who see them come in in the spring, but we help them create a lifecycle.”
Milkweed plays an important role in aiding the monarchs in their generational journey, but also, being cautious with fertilizer and lawn care products. The monarch butterfly population has declined 90 percent over the past two decades, which is directly related to the milkweed population being destroyed.
Charles took this last week. Head over to his Flickr for lots more!