Archive for the ‘trees’ tag
Citizen scientists collect data to find out how climate change impacts redwoods
by Kristin Butler
“The redwoods, once seen, leave a mark or create a vision that stays with you always. No one has ever successfully painted or photographed a redwood tree. The feeling they produce is not transferable. From them comes silence and awe. It’s not only their unbelievable stature, nor the color which seems to shift and vary under your eyes, no, they are not like any trees we know, they are ambassadors from another time” John Steinbeck, Travels with Charley: In Search of America.
Anyone who’s ever been in a redwood forest knows the sacred experience Steinbeck described in his famous book. Even my dog Kia, on her first hike along the hooded trails of Sanborn Park near our home, bowed uncertainly at the hush of that forest’s redwoods and gazed with wonder at its canopied sky. While photos may fail to replicate the stature of these magnificent trees, they can help conservationists protect them.
Five years ago, a nonprofit in San Francisco called Save the Redwoods League (which buys, protects, and restores redwood habitat) started a citizen science projected called Redwood Watch. Volunteers in the project take photos of redwoods using an app called iNaturalist and the data they collect is helping conservationists better understand redwood distribution and take strategic measures to protect these iconic trees.
“You’d think we’d know where every redwood tree is, but we don’t,” said Deborah Zierten, Education and Interpretation Manager for the Save the Redwoods League. “This projects helps us refine our maps.” The Save the Redwoods League, which is heading into its centennial anniversary soon, will use the data from Redwood Watch to create restoration plans for the organization’s next 100 years, Zierten said.
In particular, the organization is interested in understanding how climate change may be impacting redwoods and their ecosystems and how to help the trees adapt and survive, she said. In California, Redwoods grow within a narrow 450-mile strip that hugs the coast from Big Sur to just over the Oregon border. In the winter months, the trees rely on rainfall and in summer they get the water they need by absorbing coastal fog through their needles and roots, Zierten said. This could make them vulnerable to drought and temperature changes.
Interestingly, redwoods are one of the best protections the planet has against climate change.
Old growth redwoods (trees that are over 200 years old and that survived the gold rush of logging) can take in three to five times more carbon from the atmosphere than any other force on the planet, Zierten said, making them one of the best carbon sinks. Their high branches are so dense, intertwined, and coated with decomposing needles that new trees actually take root and grow on them high above the ground. Of the original coastal redwood range, only about 5% of the old growth forest is left. In addition, 26% of redwood timberland habitat (forests that have been logged and replanted) has been lost to roads and other development.
“One of our goals is to make sure the remaining forests remain protected,” she said, against development, fire, invasive species, and other threats. The Save the Redwoods League encourages volunteers to not only photograph redwoods, but to also photograph the plants and animals that rely on old growth and newer timberland redwood forest ecosystems. These include threatened species such as the Spotted Owl and Marbled Murrelet; Black Bears and Pacific Salmon; the Pacific Fisher; the Marten; and plants like Huckleberry and many types of lichen.
Volunteers have already collected more than 2,000 observations and the organization plans to continue the project well into the future to preserve these awesome, silent “ambassadors from another time.”
Kristin Butler is a Bay Area journalist and Outreach and Communications Director for the San Francisco Bay Bird Observatory.
If you’re looking for more projects for the holiday season, we’ve got 12 Days of Citizen Science for you!
Don’t forget to check out the public radio segment about Tiny Terrors on WHYY’s The Pulse!
The Grinch is back and this time in the form of a tiny insect invader. Meanwhile, scientists are looking for the one tree… that will save Christmas. Ok, dramatics aside, this is only half wrong. Eastern Hemlock, balsam, and Fraser fir are three evergreen trees that dominate large swaths of terrain across Eastern America dying from the attack of two invasive pests. One, the balsam woolly adelgid or Adelges piceae, has had a devastating impact on Fraser fir and balsam fir, trees you may recognize in your living room if you celebrate Christmas. Eastern hemlock trees dying from the hemlock woolly adelgid, otherwise known as Adelges tsugae, are also leaving behind bald patches on a damaged forest landscape.
The key to preserving our forests? Scientists at North Carolina State University and in the Alliance for Saving Threatened Forests believe that a particular tree or rather some particular groups of trees might be the solution. The idea is that there may be trees within each species that have a natural resistance to the adelgid that most trees in America don’t have.
This is part of the reason why hemlocks and firs are dying in such large numbers. The Balsam woolly adelgid is originally from central Europe and the hemlock woolly adelgid is from East Asia, where native trees have evolved resistance or tolerance to adelgid infestation. But the trees in the U.S.? Dr. Fred Hain, an entomologist at North Carolina State University, says they have had “no co-evolution [with the adelgid] and the trees do not show any resistance and are very susceptible. And also, there are no natural enemies in this system to keep pests under control.” But there may be trees in our native range are lucky enough to have some form of resistance to the adelgid; we just haven’t found them yet. As it turns out, they’re extremely hard to find. “It’s like looking for a needle in a haystack,” Dr. Hain says.
This is where the Tiny Terrors Project (official site) enters. Led by Dr. Hain and grad student Erin Mester, the Tiny Terrors project is a piece of the Alliance for Saving Threatened Forests that enlists the help of citizen scientists to find those resistant trees. With so much land to cover and so many trees to see, citizen scientists can provide a significant boost to the search for resistant trees. Hain and Mester ask volunteers to try and identify resistance by finding trees that have very few or no adelgid in infested areas. The team will then try to get either a cone, if possible, or clippings from the tree to run experiments on.
The first thing they need to do is determine whether or not the tree has been treated with chemical pesticides, since that would make a tree appear to be resistant even if it actually has no natural resistance. Then, if the tree hasn’t been washed or injected with pesticides, then the scientists will grow seedlings from a cone or try to clone the tree from cuttings and expose it to adelgid to see if it really is resistant. If the adelgid doesn’t take, or if the trees survive the infestation, then it becomes a task of understanding what the cause of resistance is. “So far, we’ve identified a thicker cuticle of the needle as being critical,” Dr. Hain says, meaning the few trees the Tiny Terrors project has pulled up as promising appear have a thicker skin. This makes it more difficult for adelgids to penetrate the tissue. This hypothesis also seems to be supported by the fact that trees native to central Europe and Asia have this adaptation as well.
Hopefully, scientists like Hain and Mester will be able to transfer the resistance genes over to other hemlocks or firs if they’re able to find those special trees. Unfortunately, even this is easier said than done. A similar story played out on the continent in the early 20th century, when a fungal infection called the chestnut blight nearly wiped out the American chestnut. Chinese chestnut varieties had a natural form of resistance to the blight, and scientists tried then to create a viable hybrid between Chinese and American trees to combat the blight. By breeding that hybrid with other surviving American chestnut trees for many generations, scientists were finally able to create a blight-resistant tree that had 98% American genes and 2% Chinese genes. But that wasn’t until nearly seventy years after the blight had decimated the population of chestnuts in America. At this point, much of the original genetic diversity of the American chestnut is gone forever, and it’s unclear whether or not chestnuts will ever return to the full extent of their former distribution.
This could happen for Fraser and Balsam firs as well, should nearly all of the population of trees be killed. Fortunately for hemlocks, however, an organization called Camcore has been stockpiling a bank of hemlock seeds for the purpose of preserving their genetic diversity. But Fraser firs may not be so lucky since not as many people are looking out for them, despite Christmas trees occupying a nearly 1 billion dollar industry.
While none of these trees are important as timber, hemlocks are what is known as a keystone species and have a disproportionate impact on the ecosystem. “The ecological impact,” Dr. Hain says, “could be quite traumatic.” For instance, hemlocks are often found by streams and provide a good deal of shade. This shade might be critical to keeping the water temperature down, which is already reaching the thermal limit for trout in the south. The loss of that shade could also ruin the habitat for trout.
The Tiny Terrors project is just getting on its feet. But, if it’s successful, it could help prevent the deaths of many conifer forests and the life depending on them. That success hinges on a number of things, including whether or not naturally resistant trees exist and if a successful hybrid can be made, but most importantly on how many people volunteer as citizen scientists. Dr. Hain believes that the project will move forward, as more people spread the word. In any case, Christmas is probably still on this year with a Fraser fir and, who knows, maybe a trout. But in the future, people may have to find alternatives.
Angus Chen is the managing editor for the SciStarter Blog network which includes the Discover magazine “Citizen Science Salon” blog and the Public Library of Science’s Cit Sci blog. He’s also a freelance reporter and producer at WNYC Public Radio on “The Takeaway” with Public Radio International and the NY Times. You can also read his work with Science magazine. He was once a scientist studying geology and ecology, but now spends his days typing and scribbling and sketching furiously.
Human beings are remarkably capable animals when it comes to pattern recognition. The human ability to quickly and accurately recognize recurrent patterns is a skill that numerous citizen science projects have put to work on large, difficult data sets. Galaxy Zoo uses these skills to assist with the morphological classification of galaxies. Pattern recognition and also spatial reasoning contribute to the success of the protein folding project Foldit. Another project aims to take advantage of these human skills and, like Foldit, does so with a game.
Fraxinus is a game created by The Sainsbury Laboratory (TSL) to help researchers address ash dieback in the common ash tree (Fraxinus excelsior). Players attempt to match a nucleotide sequence to a reference genome to look for sites of variation. The game was designed for the social media platform Facebook and allows users to play the game as they would any other on the site. However, this game provides more than entertainment. Fraxinus also provides scientists with small pieces of data that can be aggregated to provide a better understanding of the mechanisms that protect some common ash trees while others perish.
With more than 10,000 puzzles to solve in the game there is a significant amount of work for citizen scientists, but already each of these puzzles has been examined, according to a recent report on the game. Now that each puzzle has been looked at, players will begin to “steal” patterns from one another, in an attempt to increase their game score, and at the same time they will help refine sequence patterns, which in-turn provides better quality data for researchers.
You can learn more about the background for the project, including the basic science, and Fraxinus with Dan MacLean, Bioinformatics at Sainsbury Laboratory, here.
Ashley Rose Kelly is a Ph.D. candidate in the Communication, Rhetoric, & Digital Media program at North Carolina State University. Ashley studies how emerging technologies may be changing science communication. She also teaches scientific and technical writing courses as well as an introductory course on science, technology, and society. You can find Ashley on Twitter as @ashleyrkelly
SciStarter has a whole round-up of tree-related projects for you this season. Branch out into citizen science!
Walking around my neighborhood the other day, I was casually observing the local flora when I was struck by the redness of one particular set of leaves. While the tree pictured is not the exact one I spied upon, look at how vibrant these colors are! I began to wonder why this tree turned red while the others around it stayed orange and yellow. To begin, we must learn about why autumn leaves deviate from their greener shades in the first place.
As you probably already know, the color that most plants have is derived from chlorophyll, the yellow-green pigment found in chloroplasts responsible for allowing photosynthesis to take place. If you’ve forgotten how this process works, Crash Course Biology has a great video for this. While there are multiple forms of chlorophyll, it is generally true that most reflect green light, causing for plants to appear the way they do. (This raises the even better question of why aren’t plants black, but that deserves its own post.)
So, what happens to the chlorophyll as we approach the cooler months? When the temperature drops, deciduous plants slow the production of chlorophyll in preparation for the dormant period they will undergo during the winter. The plants will then be able to conserve energy by halting all photosynthetic processes during the lack of available sunlight. As this happens, orange and yellow carotenoids present in the leaves are exposed. These are pigments that are normally produced in leaves that help to absorb additional energy from the sun that is passed along to the chlorophyll and also to prevent auto-oxidation (basically the wear down of cells due to free radicals) from occurring. In addition to all of this, the plant begins to produce a cell wall between the stem and the leaf called an abscission layer. This will eventually cause for the leaf to be completely separated from the plant, allowing for it to fall to the ground.
Okay. We’ve covered green, orange, and yellow, but what produced the scarlet beauty found above and why doesn’t it occur in all trees? The answer is anthocyanins. If you’ve ever eaten a blueberry, raspberry, pomegranate, or any other fruit that can stain your hands and clothes, you’re probably already familiar with these little molecules. These pigments are similar to the carotenoids mentioned above but serve a different purpose. In cases during the late summer when plants are beginning to slow their photosynthetic processes but there is still plenty of sunlight abound, the leaves can actually be harmed by receiving too much high-intensity light in the region of Photosystem II (photoinhibition). In order to prevent this damage, the plant begins to synthesize anthocyanins to permeate through the leaves’ surfaces. Because of its red color, the pigment absorbs a large amount of the high energy visible and ultraviolet photons striking the plant, basically acting as a “plant sunscreen.” (Check out how you can even build your own anthocyanin-based solar cell!) Additionally, anthocyanins are good indicators of plant stressors including freezing temperatures and low nutrient levels.
Next time you see a particularly red tree, make sure to think about its environment! Does it receive an abundance of light? Has it been particularly cold? Feel free to comment with links to your own pictures of vibrant trees and plants!
Just like leaves, citizen science also happens to grow on trees! Don’t believe us? Check out our tree projects round-up!
Photo: Public Domain Pictures, Wikipedia
This was a guest post by Joe Diaz, a science educator and enthusiast. Follow @RealJoeDiaz. View the original post.