Wildlife Torpors (one-night “hibernations”)

Two mini-hibernations I observed in the garden today:

At morning prayers (a bit earlier than usual, well before sunrise), I heard a noisy motorcycle revving its engine, and spluttering and revving and spluttering, and revving hard and long, successfully getting started… from up in the top of a coast-live oak. After its successful start, the engine abruptly aborted and ended in a couple of clear, hummingbird chirps, and then the hummingbird, now fully awake from its nightly hibernation, flew off to hunt for breakfast.

And tonight, while we were eating dinner as darkness was falling, a giant mama, yellow-faced bumble bee flew to a blueberry bush just outside our dining room window (single-pane glass allows some of our heat out to warm that bush at night, and the first rays of morning sun warm it in the morning), and after pumping her abdomen for a wee bit, trying to stay warm, she curled into a tight little ball huddled beneath a blueberry leaf, and turned to stone – hibernating for the night.

What a wonderful cold weather warning system.

Time to put on an extra layer of heavy, merino woolen-wear!

Bumble Bee Barometers

I have now observed this three times in the last month: bumble bees acting frantic and racing about as if to avoid impending doom (and being downright testy about people being in “their” yard), on a sunny day just before a big rain storm arrives. Typically, our yellow-faced bumble bees go about their business in a busy, but relaxed and predictable manner. So, I had to wonder: can bumble bees be used as a kind of barometric indicator, to help a Druid predict the weather?

Hunting around the web, I found a report of a recent study, “RFID monitoring indicates honeybees work harder before a rainy day,” by He XJ, Tian LQ, Wu XB, and Zeng ZJ. (inInsect Science 23(1) • November 2015), which supports the idea of what I have observed, though the research was done on honey bees rather than on bumble bees.

Another study, by Erika Nardone, Peter G Kevan, Michael Stasiak, Michael Dixon, “Atmospheric Pressure Requirements of Bumblebees (Bombus Impatiens) as Pollinators of Lunar or Martian Greenhouse Grown Food,” (in Gravitational and Space Research 26(2) • October 2012) showed that there is a relationship between foraging activity in bumble bees and the atmospheric pressure – though the pressure differences they tested were much more extreme than the ones I am dealing with. On the other hand, much of physiology is driven not by absolute numbers or concentrations, but by the rates of change of those numbers or concentrations. So, the causes of the behaviors I have observed could easily be related to rapid atmospheric pressure changes.

I have never seen this frantic behavior in bees, going from overcast sky to drizzle, or drizzle to heavier rain, but only from brilliant sunshine to sudden, intense rainstorm. That said, the rate of pressure change might have been sufficiently daunting so as to cause a panic. If the bumble bees can sense the atmospheric pressure change preceding a storm, they might know that it will be harder to forage tomorrow, and so rush to lay in emergency supplies, just in case.

So: When bumble bees forage frantically, rain is on the way.

Tradition has it that the ancient Druids could control the weather. Perhaps a more accurate way of putting it would be that Druids have always observed subtle signs like this, and knew perfectly well how to predict dramatic changes in weather. The Wise among them would then choose when (and when not) to share that knowledge, only speaking when it might prove useful.

 

Yellow-Faced Bumble Bees

by Estifanos (age 6), of California, U.S.A.

About the middle of January, I started seeing these bumble bees visiting the blueberry bushes in our front yard and the manzanita bushes in the back yard, getting pollen from the flowers. They make A LOT of noise when there are a lot of them buzzing around your head, so we wondered what kind of bees they were. I looked in the Kaufman “Field Guide to Insects of North America,” and found out that they are called yellow-faced bumble bees. These bumble bees live in the area between southern Canada and Baja California, along the west coast of the United States. They look like this:

I’m not very fond of bees, and so I wanted to know where their nest was, so I wouldn’t get stung. Mama found this video about bumble bees, that I found very interesting and very very amazing. The amazing thing I want to tell about was that a bee drove a mouse out of its home, so that the bee could own it instead! Since these bees nest underground, I think we should put a big rock near the entrance so that we remember not to go too close.

 

 

Lessons from an Ecosystem Restoration Project

Over the past 13 years, my husband and I have been engaged in an ecosystem restoration project, on the 1/3-acre parcel of land we live on, in the foothills of the coastal mountains of California, just a wee bit south of San Francisco.

The project began as my husband and I considered our distressed 1/3-acre of land, overgrown with rat-infested juniper bushes, 32 drought-stressed and dangerously beetle-infested Monterey pines in decline (which routinely dropped dangerous, heavy limbs into the yard), and invasive weeds and non-native grasses that were doing a fair job of smothering the few remaining native seedlings — which had primarily been planted, haphazardly, by squirrels. Mother Earth was crying out for help.

I decided to return Her to Her former glory — as soon as I could figure out what that glory might have been. Once upon a time, before the coming of humans, Mother Earth had planted this place with flora of Her choosing. Plants that did not require irrigation, fertilizer, herbicides, and pesticides. Plants that were well suited to the local climate, and weather patterns, which thrived in the local soils, which created habitat for native wildlife, and thus created and supported their own, interdependent ecosystem. I was determined to find out what they were.

As the land was cleared of dying trees, we bribed friends with pizza and beer, and started the grueling work of clearing the 1/3-acre of weeds, and laying down a 6” layer of (native hardwood) mulch. The only plants that were allowed to stay were a sickly, 60-year-old pink pepper tree, which we felt we could rescue, and fifteen native, coast live oak tree seedlings, which had been planted by squirrels, and had so far (barely) survived burial by weeds.

While this was going on, I began a process of extensive ecological research, comprised of both field observations and library study, to determine exactly what plants and animals were likely to have comprised the original, thriving local ecosystem. This knowledge had been occluded by a long history of extensive, damaging industrialization, suburban McMansion construction, and the ensuing replanting of postage-stamp gardens with foreign plants in constant need of pesticides, herbicides, fungicides, and fertilizers, as well as far too much supplemental irrigation. A walk around the local neighborhood tells you nothing about the native ecosystem — except that there were once some tenacious young coast live oak trees, which somehow survived the human modernization of the area, and lived to become grand old “heritage” oaks, full of spirit, life, and loneliness.

Hikes in regional protected wild areas taught me much about the understory shrubs and small trees that once would have kept those grand old oaks company. Some of them are stunningly beautiful, the year around: arctastophylus, ceanothus, and heteromeles, among others. Others, such as the salvias, artemesias, rhamnus, and ribes, have only brief moments of glory, but provide food, shelter, and ample leaf-litter, in which local lizards and birds hunt bugs. On my hikes, I generated lists of ideas of flora and fauna that might be encouraged to live on our property. However, variations in microclimate are extreme in our area, and so, I hit the books.

I studied the geology, soil science, weather and climate patterns of our area, as well as the ecological relationships that might be expected to exist between them and our area’s native flora and fauna. I studied the microclimate of our particular property — light and shadow patterns, fog-drip patterns, the locations of wind tunnels and wind shadows, and the like. I then identified an array of plants, shrubs, and trees, native to our particular microclimate and soils, which when established should work together to provide canopy cover, food and shelter for wildlife, soil retention on slopes, wind breaks for delicate plants and animals, and to help to restore the proper soil ecology, so that bioactivity in the nearly-dead soil would increase, and enable the land to become self-sustaining. But of course, this was all theory. Experimentation was soon to follow.

Once the land was cleared of weeds, and the thick layer of native mulch was laid down, our oaks exploded into new and vigorous growth. As they grew, we gradually planted well over one hundred, one-gallon seedlings of native plants, trees, and shrubs. Research had shown that starting small takes longer, but that the survival rates of restoration plantings were much higher when the baby root structures were allowed time to build the symbiotic relationship with the mycorrhizae in the soil, slowly, so as to survive the annual summer dry spell that lasts from May through October.

We massed plants so that they could be seen and identified by native birds on the wing, enticing them to investigate. We built tumble-down rock piles to encourage lizards to take up residence. We set up miniature watering holes for the wildlife. And we hand-weeded and nurtured our initial plantings for just over five years, until the plants were solidly established, and we attained both 80% canopy cover of integrated native plant species, and the corresponding revival of the hidden, mycorrhizal structures that should continue to support our native plants over time.

While the native plants were establishing, we began to notice the return of native fauna. Over the course of ten years, we observed a dramatic increase in both the number and variety of birds, reptiles, amphibians, insects, and mammals resident on the property. The number of bird species observed in our yard grew from about five species of migrants (some robins, a few crows, etc.), to several dozen native species, including nesting, mated-pairs of: Bewick wrens, California towhees, spotted towhees, California quail, mourning doves, oak titmice, juncos, Anna hummingbirds, scrub jays, mockingbirds, house finches, gold finches, and others. We now have: rabbits breeding in a salvia patch; great horned owls hunting; red-tailed hawks hunting; a mama raccoon with babies; skunk families (on occasion); and the occasional rat, gopher, or mole. We are also blessed with thriving honey bees, bumble bees, and diverse native pollinators, by the thousand. We have also noted an increase in the number and variety of migrating birds that stop predictably on our property during their annual migrations. The annual glut of bird wars, nesting battles, lizard push-up competitions and wrestling matches, as well as the regular appearance of young birds, bunnies, lizards, skunks, and raccoons trailing their parents (and teething on the fence posts and backyard swing), is a clear indicator that the restored ecosystem is thriving.

I now spend the majority of my time watching for signs of the Numenons within the ecosystem we so lovingly restored. Rather than simply gathering measurable scientific data about each player — trace-mineral levels in the soil, moisture levels, presence or absence of known plant pests or pathogens, and the like — I watch and listen for the music of the ecosystem. If a voice drops out of the symphony, I know whose it is, and I know to ask why. I look, and listen, and change perspectives, attempting to see things from the point of view of that being. If I notice a bug, or strange growth on a plant, I know not to worry; a generally healthy plant is able to outrun most plant pests and pathogens. If a plant or animal seems distressed, however, I fall back on scientific observations to diagnose and address the problem. I also allow the ecosystem breathing room to reinvent itself, at will. I still come down hard on invasive weed species that threaten the local mycorrhizae, but when a native plant decides to move itself to another part of the property, through runners to a happier location, or through the random fortune of a bird’s back end, I allow it free reign to establish itself where it will. And so, my role as steward of this patch of land has become a delicate partner-dance of ecological tweaking, and reverent observation of flora, fauna, and patterns of existence that were once very much in the realm of the occult.

And so, my relationship with the indigenous flora and fauna of my landscape grows ever stronger, and I feel myself becoming more and more rooted in this time and place.