Heading South: Monarchs on Migration

Last month a monarch caterpillar found a nice cozy spot under a cabbage leaf and decided to pupate there. It walked a fair distance before finding shelter, because the nearest patch of milkweed is a football field's length away.

After 24 hours it had changed into a chrysalis.It was well protected from wind and weather and, apparently, anything interested in munching on chrysalides. Not to mention that the chrysalis blended well with the color of the cabbage leaf...

Now it’s waiting to join the vast Monarch migration southward, to Mexico – which, given where we live (42nd parallel) should peak over the next two weeks. 

If you live south of the 45th parallel, now’s the time to start paying attention to Monarch butterflies. Scientists are interested in them and you can help by gluing tags on Monarchs you catch in your neighborhood. It’s a great way to spend sunny autumn days with your children and helps scientists learn more about these butterflies. You can learn more at Monarch Watch.

Decoding Firefly Flash Codes

photo: http://www.flickr.com/photos/theloushe/3622541416

If you missed the meteor showers due to rain or moonlight, don’t despair – you can catch the nightly firefly shows. Fireflies fill the dark spaces between the stars with their blinking lights. Watch them long enough and you begin to see that there are different flash patterns. Some fireflies blink many times in quick succession, dit-dit-ditting a zigzag through the dark. Others flash a couple of long, slow blinks and pause, as though waiting for a response. Perhaps they are; within seconds flash-code messages are returned from the tall grass.

With as many as 20 to 30 species in our region, all sharing the same habitat, the nighttime airwaves can get crowded with messages. To reduce confusion, each species has developed its own unique flash code. One species might signal with a long flash followed by two short flashes, while another uses three flashes in a row.

Just as important as what fireflies say is how they say it. Some species hover in place as they flash; others write their love messages in glowing curves as they fly. While some fireflies flash their love messages early in the evening, others don’t even file their flight plans until the night’s half over.

Fireflies divide the night sky spatially as well. Some species fly low, right over the grasses, to flash their messages. Others fly at shrub-height, and even others fly among the treetops. Then there’s color – some fireflies flash greenish-yellow while others produce an orange glow.

To find out more about the fireflies in your back yard all you need is a notebook and pencil, a flashlight covered with blue cellophane (fireflies don’t see blue) and a warm night for watching. Spend a few minutes watching the lights, then jot some notes down. If you can distinguish individual fireflies you might be able to decode their flash patterns. Some of the things you’ll want to keep track of are the colors of the flashes, the pattern (length of flashes), how many flashes are in a series and the interval of time between flashes. If you don’t have a stopwatch you can count seconds by saying “one fire fly, two fire fly…”

You will also want to note such things as time of night you see that particular pattern, how high the male flies and what his flight pattern is, where you saw the responding female, and the temperature.

For more on fireflies, check out Firefly Facts 

Creating Pollinator-Friendly Yards

If you want native bees and butterflies to visit your yard, the first thing you need to do is reduce or eliminate your use of pesticides. Instead of spraying chemicals, find other ways to control weeds and insect pests in your garden and yard. Scientists have shown that native bee populations drop by around 50 percent where insecticides have been sprayed. Bumblebees are paralyzed by neonicotinoids – a class of widely used insecticides that act on the nervous system of insects – at levels as low as 12 parts per billion.

Provide as diverse, natural landscape as you can. Are there sections of your property that you can let go a bit wild for the summer and mow once a year? Think about planting native shrubs and trees – they not only enhance the habitat for bees but can add value to your landscaping. Native bees, it turns out, like to forage close to home. While honeybees readily fly two miles to collect nectar and pollen, wild bees rarely fly over 1/2 mile.

Bees depend on nectar for food throughout the entire summer. So think about planting things that bloom over the entire season. Check out the list of flowers bees love below.

Bees also need a source of water. They use water to cool their hives and dilute the honey they feed to their larvae. On extremely hot days, bees might spend more time carrying water back to the hive than foraging for pollen and nectar. Birdbaths work, but make sure the water is shallow, as bees can drown. You can also put a rock or a floating bit of wood in deeper water to provide a place for thirsty bees to land on.

Wild bees need nesting sites. Most of them are solitary, and about a third of them build their nests in wood. They tunnel into the soft pithy centers of some twigs (raspberry canes and sumac) or use tunnels left behind by wood-boring beetle larvae. The other 70 percent are ground-nesters, digging narrow tunnels down to small chambers of brood cells. Ground-nesting bees need direct access to the soil surface and prefer sloped or well-drained sites. Bumblebees, too, build their colonies underground, moving into abandoned rodent burrows.

Encouraging wood-nesting bees can be as simple as retaining dead or dying trees and branches in the hedgerows and encouraging the growth of elderberry, blackberries and raspberries, sumac and dogwood. To attract ground-nesters, leave a small area untilled for a year or actively clear some of the vegetation from a gently sloping or flat area.

Flowers Bees Love

Red maple, chives, Shadbush/ serviceberry, asters, borage, bee plant (Cleome), cosmos, purple coneflower, Joe-pye weed, sunflowers, hyssop, apple blossoms,  mints, bergamot/ bee balm (Monarda), basil, oregano, poppies, plum and cherry blossoms, roses, willows, sage, goldenrod, dandelion, thyme, red clover, blueberries, mullein, zinnias.

You can learn more about bee-friendly gardening here.