Pollinators are an indispensable part of the world's
ecosystem. They carry pollen from one plant to another, helping them to reproduce.
75% of the world's flowering plants and 75% of our crops rely on pollinators
like bats, bees, beetles, and butterflies. Without pollinators, foods such as
blueberries, cherries, apples, almonds, coffee, and chocolate would disappear!
One of the
most charismatic and unusual pollinator is the monarch butterfly. The
caterpillars are recognizable for their yellow, black, and white striped body
and the adults for their vibrant orange wings. Monarchs are peculiar in that
they rely solely milkweed plants: it is the only plant they lay eggs on and the
only plant they feed upon as caterpillars.
We've raised monarchs for the past 20 days or so. They
started out as minuscule eggs on milkweed leaves. After hatching, they ate and
grew rapidly. Between 10 to 15 days they increased their size and weight almost
3,000 times! Most of them have entered the chrysalis stage of their
development. In another 10 days or so, adult monarchs will emerge into the
world.
When fall comes around, our monarchs will undergo one of the
greatest migrations on earth. Hundreds of millions of butterflies will swarm
over the country in a smoky ochre-hued cloud to descend upon high-elevation fir
forests in central Mexico and the sunny coasts of central and southern
California. The migrations require the butterflies, weighing not much more than
a paperclip, to cover distances between one and two thousand miles. To
accomplish this, monarchs need to cover between 25 to 30 miles a day!
Unfortunately, the monarch population has dropped by 90%
since 1980, when populations first started to be monitored. This drop in
population can be attributed to several different factors. The first and most
important factor is the overall loss of milkweed throughout the United States.
Milkweed is lost for a variety of reasons: herbicide use, increasing
urbanization in milkweed growing areas, widespread industrialized farms, and
drought conditions in many parts of the western U.S. Illegal logging in Mexico
has also resulted in habitat loss in the monarch's overwintering grounds.
People throughout the United States can take small yet
significant steps to help. The first is to plant milkweed. There are over 100
native milkweed plants, many of which are used as food for monarchs.
Individuals can also plant pollinator-friendly plants, like butterfly weed,
zinnia, and sunflowers. Monarchs need the nectar for energy to breed, to
complete their migration, and to build energy reserves for the long winter.
People should avoid using pesticides as well. The general pollinator population
is plunging, but with a little awareness and some small actions we can
collectively make a huge impact.
No comments:
Post a Comment