Showing posts with label field biology course. Show all posts
Showing posts with label field biology course. Show all posts

Sunday, January 17, 2010

Homage to Amelanchier

(A flowering Juneberry in May at DrTom's.)

One of the required trees to learn in my field biology course was a relatively insignificant species (from a timber perspective) called Juneberry, or shadbush, or serviceberry. It has several common names, but I am referring to the genus Amelanchier. The common species in our area is Amelanchier laevis, or smooth Juneberry. This shrub or small tree is in the rose family, and rarely gets more than 10 meters high. It flowers in May when the American shad (a fish) used to run up the eastern rivers, and it bears ripe fruit in June (thus, Juneberry).

The tree was always difficult for students to identify in autumn when it contained neither flowers nor fruits, so I made a big deal of how much I loved this tree. During the semester, I often heard students say in discussing the trees they were required to know from their list, “you know the one, Gavin’s favorite tree.” I thought that by exaggerating my love for this species that they would more easily remember what I wanted them to know. But I really do love this species; it is one of my favorite trees in the eastern deciduous forest. But why?

First of all, everything about Amelanchier is attractive. The gray bark with weaves of green running through it, the finely serrated leaves, the abundant white blossoms, and the purple fruits that resemble blueberries offer much. But many open-grown specimens have a growth form that reminds me of a small tree you might see in a Japanese garden, almost like a giant bonsai tree. Based on my observations, they are slow growing, adding only a few centimeters of new growth per year. Although I have never worked the wood, it is supposedly hard and durable and was used in former times as tool handles.

Second, starting about mid-June, the fruits ripen and the show begins. So, my evening ritual (you know, scotch, cigar, binoculars, and folding chair) is often spent sitting several meters away from my favorite Juneberry. Every fruit-eating bird in the area is attracted to this offering, which, of course, is how the tree disperses its seeds. Birds swallow the fruits while they are in the tree and defecate the seeds elsewhere several minutes later. American robins, gray catbirds, veerys, and cedar waxwings are the most common visitors on my property. Lat year on June 14 the fruits were not yet ripe, but the waxwings started feeding on those fruits a couple of days before. (Are those seeds ready to be dispersed yet? Are they yet viable?) This is really curious to me and it deserves further investigation. In a few days, the branches of the tree will be moving constantly with the shifting of bird bodies intent in harvesting as much as they can as rapidly as possible.

The most interesting visitor is the yellow-bellied sapsucker, the fruit-eating woodpecker with a sweet tooth. Remember that this is the species that drills small holes in a neat horizontal line in certain species of trees (like red maples), and then visits these holes later to lick up the sweet sap that oozes from them; it may also feed on insects that are attracted to the sap. For several years, I have had a pair of sapsuckers that visit my Juneberry trees as long as there is ripe fruit available.

Gray squirrels and eastern chipmunks also love these fruits and, although I have yet to witness this, I am betting that deer mice in the genus Peromyscus climb these trees at night to eat the fruits. George Petrides writes that foxes, skunks, raccoons, and black bears also relish Juneberry fruits. They are also quite edible by humans.

I have described my hobby of thinning my woodlot for various purposes. One of the objectives has been to release this sun-loving tree to fuller sunlight along my driveway so that it flowers more profusely. There are now 14-15 specimens lining my long driveway, which provide a beautiful show of flowers in May. I usually proclaim that spring has really arrived when Juneberry is in flower. Oh, I did not mention this, but an old etymology of the third common name, serviceberry, is consistent with my proclamation of spring arrival. Pioneers are said to have used the flowering of Juneberry to know that the ground had thawed sufficiently to bury those who had died during the winter—funeral services could be held at that time.

My enthusiasm for Amelanchier has not changed over the years. About all that has changed is what used to be called “Gavin’s favorite tree” is now referred to as “DrTom’s favorite tree.” Same tree, different name.

Tuesday, September 1, 2009

The big sting

(My friend Ida Lydiya, a Latvian immigrant who allows me to cut firewood on her property.)

For nearly 30 years I taught a course titled Introductory Field Biology at Cornell.  The course had many field trips to local natural areas where we could find amphibians, bog plants, and other features or organisms of natural history interest.  Near the end of the semester, I would bring the class to my property for our afternoon 3-hour lab.  I would talk about the birds' nests I had found the previous summer, woodlot management, forest ecology, control of invasive woody plants, etc.  But I always told the students when we arrived at the site that the property belonged to a widow who lived there named Ida Lydiya, who, I told them, immigrated to the U.S. in the 1950s to escape the Latvian revolution

I explained to the students that Mrs. Lydiya and I had an agreement.  I could cut firewood on her property, but I would give her 1/3 of what I cut for her to use in her wood stove in the winter.  This is a common agreement here in upstate NY, and is referred to as cutting firewood for "shares".  When we visited my property, it was always in October, the time of year when I had numerous piles of cut firewood scattered around my woodlot, often 100-200 yards from the house.  And October is the month I move firewood to the back of the house in preparation for use in November.  So the wood needed to be moved, and it is a huge job for one person, and I was getting older, and my children had left home, and my wife was not interested in this activity, and the wood was not going to move itself.  So I told the students that it would be a nice gesture to Mrs. Lydiya to move her share of the wood behind the house, in payment for letting us visit her property for this field trip.  Every year, the students would dutifully drop their notebooks and backpacks, pick up an armful of wood, and march to the house with their booty.  The class usually had about 40 students, so 3-4 trips per student resulted in a significant amount of work accomplished.  Isn't this the way the Pyramids at Giza were constructed?



When it was nearly time to board the bus for the return to campus, I would stop the wood-moving.  At that point, I explained that the name Ida Lydiya could be pronounced "I'd a lied to ya".  To watch the expressions on their faces at that point was worth every minute I had spent teaching these sophomores and juniors the previous two months.  There was always the danger that they could have become an angry mob at that point and turn on the old man, but they laughed and admitted it was a pretty good joke.  In addition, I opened the garage door at that instant, revealing a table full of donuts and apple cider.  Nothing calms down a 20-year old like the prospect of receiving a slug of sugar.  But the amazing thing was that one class apparently never revealed the secret to students who would take the course the following year.  They were naive about this subterfuge every single year for over a decade.