Madison flora and fauna slowly signal spring | Environment
Although March 20 marked the arrival of the spring equinox, Madison is still shivering in cold temperatures. According to the National Weather Service Offices, the average temperature on March 20 was 15 degrees this year, while the same day last year reached 71 degrees.
"[We've] got snow covering the ground for a longer period than normal, and we still have it now," said Levi Wood, a naturalist at UW Arboretum, after guiding a public tour titled "End of Winter" in the Arboretum on March 24. That day turned out windy and snowy, with a high temperature of 31 degrees.
"This is becoming one of the longer lasting, snowier winters any of us can remember," wrote Wood in the trip's note on the Arboretum website.
In the freezing wintry air, a few species still surfaced to herald the spring in Madison, including the skunk cabbage, a plant distributed near the Wingra Woods in the Arboretum.
Skunk cabbage, Wood said, is a "unique plant … able to come up much earlier than other plants."
It absorbs solar energy, emanates heat as it grows, and melts the snow around it.
"If you go down to the Skunk Cabbage Bridge [in the Arboretum], you can see … all the snow is gone in between the skunk cabbage plants," said Wood.
Another sign of spring, added Wood, is within the maple tree.
"I talked to people who are tapping maples trees for maple syrup, and they said the sap is flowing," Wood said.
On silver maple trees, he also observed "the buds are bigger and turn bright red," signaling that "the spring is coming, and they are ready to blossom."
Migratory birds are coming back from southern regions, including the American robin and the red-winged blackbird, said Wood. He recalled seeing groups of robins on top of trees in the morning of March 24, noting "two weeks ago you wouldn’t see any."
Great blue herons also start returning from winter habitats in the spring. These birds don’t go too far in the winter,
Wood said, citing southern Illinois and the Mississippi river as likely destinations. Herons wade in open waters, hunting for fish and frogs. Though the lakes around Madison are still covered with ice, the Yahara River provides open water for the birds.
A night walk on March 23 seeking the woodcock in the Arboretum turned out to be a futile search.
"[Woodcock] would normally be here now, but it is not here yet," Wood said.
As a shorebird, the woodcock feeds in the mud, probes inside the moist soil with its long beak searching for worms and insects. Since much of the ground was still frozen, Wood said he thought woodcocks wouldn't appear until the ground thaws in April.