|Female holly cluster with red drupes|
Wednesday, December 23, 2015
Tuesday, December 15, 2015
|Drawing of Tufted Titmouse|
When I read a great blog entry on the Cornell Lab website today, it answered a question I've had for a long time about birds and feeders in the winter upstate. No matter how many seeds I put in the bird feeder, I find that they are gone in almost a wink of an eye. I look out and see the friendly little titmice and chickadees at the feeders non-stop. It turns out that birds, like squirrels and chipmunks, are caching or storing seeds for the winter when food becomes less available. So what birds like the black-capped chickadee, the nutcracker, and the tufted titmouse shown in my drawing for the Field Guide do is to gather lots and lots of seed--not only to eat them, but instead mostly to hide them in all the wonderful nooks and crannies that nature and humans provide—in knotholes, in the little spaces in bark, in the edges of needle clusters, in the crotch of branches, and in the crevices and nooks near overlapping human-made things--shingles, gutters, and overhangs around the house. Titmice usually live their entire lives within a mile or so of their birth, so they probably know the area around my house better than I do, and I 'm sure they have their secret spots. Caching is not so easy for the titmice. They typically do it one seed at a time, shelling it and hiding the kernel around 150 or so feet from where they got it. They have to remember every place they cache their winter reserves too. Animal researchers have found that chickadees, for example, can remember not only where they have stored their seeds but also which ones they or other animals have eaten and they remember especially the caches that contain their favorite food items. Here’s another fascinating find in the study of chickadees—they actually grow extra neurons in the fall as they get busy hiding and remembering where they hid their caches. Wouldn’t we all like to be able to do this when the need arises?
Birds, especially nutcrackers, have been found to establish thousands of caches containing 100,000 or more seeds in a single year. This behavior has another side effect of replanting our forests with new trees. When the birds don’t return to eat a cache, the seeds may start to germinate into a new tree. Here’s something else that you may not realize. Many birds do not like us to watch them as they hide their winter cache. So don’t let them see you as they fly off from your feeder seed in mouth and heading to their secret cache. They have learned to be careful of possible cache thieves. So give them their privacy. Everyone needs a private space, even our favorite feeder visitors.
Saturday, December 5, 2015
|Fascicle and White Pine branch|
I love it when two worlds that I study meet over one word. The word “fascicle” comes from Latin fasciculus and it means a small bundle or cluster of all different kinds of things. It’s used for small collections of letters, books, and poems. In biology, fascicle is used for nerve clusters and muscle clusters, in botany for bundles of stamens and leaves, and in literature I learned it in terms of Emily Dickinson, who created bundles of her poems by threading 6 or 7 poems together in little packets that her friend Mabel Loomis Todd referred to as “fascicles.” And tight bundles of pine leaves or pine needles are called fascicles, nature’s little winter poems. The number of needles per fascicle distinguishes one pine from another. Even though it seems counterintuitive because they don’t look like leaves, pine needles are leaves or modified leaves in that they perform photosynthesis and manufacture food, cell respiration, and transpiration (exchanging CO2, oxygen, and water vapor with the air) for the tree all year long because they are “evergreen.” The shape of the pine needles has evolved to help “sift” snow to the ground instead of staying on the branches and breaking them. The more I learn about pines, the more amazed I am.
The Eastern White Pine, Pinus strobus, a relatively common tree in northeastern forests and a valuable one for lumber, has five slender flexible needles. As a child I learned to identify the White Pine from other pines because in its tight little sheath, it had a needle for each finger, and I could move them apart and back together to form a hand of sorts. It is a gymnosperm and like many of them it is evergreen, so we, or at least I, appreciate seeing that deep dark forest green color among the bare brown branches of the winter woods. Our house upstate is on Tall Pines Road, and as we drive up the incline from the main road to our house, we pass stands of 100 foot tall white pines, the only green around most of the winter, and I stare up at the wonder of them.
Tuesday, December 1, 2015
|Female Pine Cone Drawing|
I visited the Hamptons this past Thanksgiving weekend and gathered some pine cones much as I have been doing since I was very little. I decided to draw one, and I always read about whatever I am drawing so that I can know it better. It helps my drawing and my writing. I read that pine cones have genders, or is it sexes? I knew that pine cones were the reproductive parts of pine trees (genus Pinus) from my Plant Morphology class at the NYBG, (a class I highly recommend) but I didn’t think about them as male and female. I wondered whether they would be easy to tell apart. I wondered which ones I collect and draw. It turns out the ones I’ve been gathering are the females—ones that have completed their reproductive cycle. Young female pine cones are soft, sticky, green, and large; they grow for about two seasons while their seeds develop. After they are fertilized, they continue to grow while the seeds mature and gradually they turn brown, woody, and spiky to protect the seed. Then they open up and let the wind distribute the seeds; eventually the female pine cones die and fall off the tree for animals including humans of all ages to gather.
In the pine cone world it seems it is easy to tell the males from the females by size: the males are smaller, softer, tighter, and more closed. Most pines are monoecious, having the male and female cones growing on the same tree. The male pine cones or strobili usually grow toward the bottom of the tree and the females grow toward the upper half. Pines are gymnosperms, a word that means “naked seed,” plants that evolved cones to carry their reproductive structures—ovules for the females that develop on the scales of the cones rather than in ovaries. The pollen comes from the male cone, and the wind blows it into the female cone. Many species of birds and squirrels feed on pine cones, and just as I found out with acorns, squirrels and birds are not the only ones that eat pine cones. Humans eat parts of the pine cones—the pine nuts--but we usually toast them before we eat them. Then there is the artistic joy of pine cones—they are great to marvel at for their structure and then to draw.
Thursday, November 26, 2015
What would Thanksgiving be like without the Sweet Potato, Ipomoea batatas? I couldn’t resist drawing one of ours before we baked it for everyone at our table to enjoy today. Drawing it made me want to know more about these funny shaped orange root veggies, so I tried to answer one big question I’ve had for a long time: Are sweet potatoes and yams the same? The answer is no. The Yam, which is in the genus Dioscorea, is an unrelated tuber native to Africa and now grown in the Caribbean and is sold in mostly specialized markets. I also found out that the Sweet Potato is not related to the standard potato, Solanum tuberosum nor is it in the nightshade family as are potatoes, tomatoes, and eggplants. And here is a surprise: Sweet Potatoes are actually related to the morning glory and the sweet potato vine grows easily with pretty leaves. Thinking about that, I remembered planting a sweet potato in a jar with water and toothpicks in 2nd grade and watching it develop roots and an amazing vine that seemed to grow a little every day. I wish schools had been more into drawing to learn science back then—what a fascinating record I would have.
Sweet potatoes are among the most nutritious foods you can find, and the more orange-fleshed they are the more beta-carotene they contain. They also contain a high content of Vitamins C, B5 and B6, and complex carbohydrates. Their cultivation is encouraged in countries with poverty and poor child health. Researchers have traced this wonderful food source to northwestern South America. Its domestication seems to have occurred with the development of Tropical Forest agricultural villages around 2500 BCE. The Spanish introduced it to Europe and spread it to China and Japan. The Portuguese brought it to India, Indonesia, and Africa. Sweet potatoes have been radiocarbon-dated in the Cook Islands to 1000 CE, so it is clear that they were in Polynesia long prior to Magellan’s circling of the world between 1519-1522. One linguistic clue to these connections is that Polynesian and Quechuan languages have a similar name for the plant. We were late in discovering that wonderful food: the Sweet Potato was introduced to the United States in the 18th century, and we’ve been growing and eating them ever since.
And as we know, they have the word “Sweet” right in their name. What can say it better than that? They are tasty, healthy, nutritious, and fun to cook and eat and draw. Happy Thanksgiving all!
Wednesday, November 25, 2015
|Drawing of European Starling on ledge|
Murmuration of Starlings
At about 2 p.m. on Sunday, as we were driving near exit 16 on the NY State Thruway, we saw what appeared to be a midnight ballet in the cloudless afternoon sky. Thousands of small flying dancers twirled, swirled, dipped, and twisted. Traffic slowed. We sat in awe staring at a murmuration of hundreds or even a thousand European starlings. Scientists think that the murmurations are precipitated by a nearby falcon. But whether that is the case or not, they mystify us. Researchers examining the phenomena closely say that there is no leader in the flock. They communicate as a collective. Their behavior continues to fascinate and puzzle us. But one thing we do know for sure is how European starlings got to North America and why. As Steve Mirsky explains in his article in Scientific American, in the late19th century, a group called the American Acclimatization Society made a decision to introduce to the United States every bird mentioned in Shakespeare’s writing, and by the way, Shakespeare mentioned some 600 birds, so the task was big. The starling was only mentioned once in Henry IV, Part I and then because of the starling’s ability to learn to speak. And what the bird was going to be taught to say was the name “Mortimer,” a name that would drive Henry bats. In any case, it is said that Eugene Schieffelin, a member of the group and a Bronx resident, took the responsibility of bringing some 60+ starlings to Central Park in 1890 and 1891. To say that they are prolific is to put it mildly. Mirsky tells us, “By 1950 starlings could be found coast to coast, north past Hudson Bay and south into Mexico. Their North American numbers today top 200 million.” To many they are pests because of the way they compete with native birds for nesting spots and food. But like them or not, they seem to be here to stay along with their awe-full murmurations. I enjoyed drawing this starling with all the beautiful spots that decorate the ends of the feathers for the Field Guide.
Sunday, November 22, 2015
|Callery Pear Leaf in November Drawing|
The Callery Pear, Pyrus calleryana, in the family Rosaceae is a beautiful little deciduous tree that is one of a species of pear trees native to China and Vietnam. They were named after Joseph-Marie Callery, a missionary, who sent specimens of the tree to Europe from China. You can find them in all five boroughs. The “Survivor Tree” that survived the 9/11 attack on the World Trade Center and that was replanted at Ground Zero by President Obama is a Callery Pear tree. Callery Pears bloom early in the spring and produce lovely five-petaled white flowers that people say have, well let’s just say, an earthy smell. They only smell in the spring when the flowers emerge, unlike the ginkgos that smell in the fall when the fruit emerges. Everyone knows that ginkgo fruit smells like vomit. But not everyone knows that the Callery Pear flowers smell like semen. So if you are walking down the street admiring the white flowers covering spring trees and reminding you that summer is coming, but then you find yourself wiggling your nose and saying, “Hey, what’s that funky, spunky smell,” well, now you know what it is. New York City has lots of Callery pears, some 63,000. And lots of birds are appreciative because they enjoy the berries. In the 2005 tree census, Callery pears were number three right after the London Plane and Norway Maple trees. We’ll see what happens when the results are out for the 2015 tree census. Some people think the numbers will go down even though the total number of trees is likely to go up. Callery pears aren’t planted as much as they used to be and it’s nothing (or I think it is nothing) to do with the spring flower smell. Some people find their flowers messy. Others consider them invasive. Not only that but the trunks split easily as they age, and many are lost to storm damage. But ooh la la, the fall colors of the Callery Pear are something else. They are often deep, wine colored, which is the color I am trying to show in my drawing of one of the leaves I gathered in my neighborhood this week.