Wednesday, February 29, 2012

Feds consider capturing/killing Barred Owls to halt population losses of endangered Northern Spotted Owl

http://news.blogs.cnn.com/2012/02/29/feds-consider-killing-barred-owls-to-save-another-type/?hpt=hp_c2


Barred Owl

This is relevant to a presentation I'm giving tomorrow. The USFWS is contemplating capturing and/or killing barred owls that have been creeping into the habitat of the endangered northern spotted owl and the killing/capturing must be done to prevent the extinction of the species. Some argue that this is simply "survival of the fittest" at its best.




Northern Spotted Owl
What those people do not realize is that the habitat for the northern spotted owl is not being destroyed or impeded upon by the Barred owls, but rather destroyed and greatly reduced due to the clear-cutting and deforestation techniques involved with the logging industry. The number of NSOs is being reduced even greater by human interference with the habitat, and the barred owls, being top of the food chain predators, are simply taking advantage of the opportunity. The logging industry is not entirely to blame however, their actions are exacerbating the problem.

Friday, February 3, 2012

Lake Red Rock: Past, Present & Future


In 1965, the United States Army Corps of Engineers had embarked on a project to build a dam on the Des Moines River in Marion County approximately 35 miles from Des Moines to control flooding in southeast Iowa and on the Mississippi River. The project, Red Rock Dam, was completed in 1969 and the resulting reservoir was christened Lake Red Rock. Red Rock dam and lake were architectural marvels, creating the largest flood control structure and largest lake in Iowa respectively. The project cost approximately 88 million dollars but expenses were quickly recuperated from the prevention of destruction cause by seasonal flooding annually.



The dam itself is a gravity fed flood control structure meaning there is no pumping or movement of water by mechanical means from the reservoir to the river below. Red Rock dam consists of five flood or tainter gates each with a maximum outflow capacity of 20,000 cubic feet per second and 14 submerged sluice gates. The tainter gates are the emergency method of flood control when the reservoir becomes filled to beyond flood stage and beyond the capabilities of the sluice gates. The sluice gates are submerged in the area beneath the tainter gates in an area known as the stirring or outlet basin. Each sluice gate has maximum outflow capacity of 1,000 cubic feet per second making the maximum outflow capacity of the dam approximately 114,000 cubic feet per second. The reservoir, Lake Red Rock has a normal surface area of approximately 15,520 acres that, in times of flooding, can expand to more than 70,000 acres. Large concrete obstructions called baffles were installed below the sluice gates to slow the water as it came through the dam in order to prevent erosion. Each baffle weighed several tons and was the size of a car. The reservoir was created when the dam was completed flooding the surrounding area including the former town, and name sake of the project, of Red Rock.
The town of Red Rock is located about five miles north of Knoxville. The city itself was established on and the Des Moines River and as a result, many homes were displaced in the surrounding river valley were displaced following the construction of Red Rock dam. The evidence of these homes and farmsteads can still be seen in times of low water on Lake Red Rock. The previous highway 14 bridge just a few miles north of Knoxville that previously ran through Lake Red Rock is largely intact and is also visible during periods of low water.
Upon construction, the dam was built with the intended lifespan of 100 years. After this period, the dam would be evaluated and the decision would be made to either decommission the dam or continue its operation. Several factors would be involved in determining the continued operation of the dam including: overall condition, functionality, cost of repairs and possible upgrades, and the viability of the dam as a flood control structure. Many forces are currently working against the existence of the dam and lake and may have an impact on the lifespan of the project, the main force being the decreasing amount of storage capacity in the reservoir due to infiltration and build up of top-soils and silts. According to an interview with Bill Ehm, the Department of National Resources Water Resource Policy Director, in an article published by Jason Johnson on the United States Department of Agriculture’s Natural Resources Conservation Service website, “the amount of sediment flowing into the lake is equal to 456,000 dump truck loads of soil runoff into the lake annually.” Top-soil runoff comes primarily from agriculture fields but can also come from construction sites and bare soil areas with little vegetation. The continued build-up is reducing the amount of floodwater the reservoir can hold and also introducing agricultural chemicals into the surrounding ecosystem and food chains. Ehm continues to describe the amount of topsoil infiltrating the reservoir, sediment buildup in the lake is an innate problem, however, because of the number of acres that drain into Red Rock. More than 500 acres of land sheds water for every acre of lake. To put that in perspective, most lakes have a 20 or 40 to one ratio.” This problem, however, has not gone unnoticed and the DNR is working on erosion control methods along tributaries that dump into the Des Moines River. Some farmers are also doing their part but implementing erosion control methods including the installation of tiling and terraces. Some farmers have even switched to no-till farming methods that preserve the topsoil by not plowing and disking agriculture fields.
           The future of operations at Red Rock is dependent on controlling the topsoil influx primarily. Whether or not the dam will continue to function up to or after its planned lifespan rests on whether or not the reservoir can continue to be a viable flood control structure. Despite the grim outlook, the future looks bright for Red Rock Dam, literally. A hydroelectric power plant is slated to be installed in the pre-existing structure of the dam with construction starting in late 2013 and being completed by 2016. According to a press-release from the US Army Corps of Engineers website, the power plant will generate power for 8,000 homes in the Marion, Mahaska, and Jasper county area. The project will create 500 new jobs over the construction period and will create an economic benefit of $250 million to the surrounding area. Hopefully with continued work on preserving topsoil upstream, and preservation of natural forms water retention downstream, Iowa’s largest lake will continue exist, and the dam, continue to function.

The Barred Owl


            In the summer of 2009, I was sitting in my living room watching the news just before dusk. The sun was barely starting to set and the sky became a blend of purple and oranges. It was August. My cup of tea was steeping next to me as I flipped through the 200 channels on TV trying to find something worth watching. It was then I heard a bird call in the distance. I barely paid attention to it at first, simply passing it off as some feathery denizen retreating to its nest for the day. I turned my attention back to the TV, again flipping through the channels. I heard the call again, closer this time. I cocked my head to look behind me out of the large patio-door window expecting to see, well, something. I didn't of course, but I did hear the call again. The thought finally crossed my mind that it sounded like an owl, and the subsequent thought of I have never seen an owl. I couldn't waste this opportunity.
I walked out onto our wooden deck that rests in the shadow of a large cottonwood tree and looked up into the foliage, scanned the limbs and leaves for a few minutes before finally finding the owl. It was the largest bird I had ever seen. Its grey and brown feathers barely showed through the leaf-cover of the cottonwood; a near perfect camouflage. Wanting to see it more clearly, I moved to a different position to get a better vantage point at the owl and again peered up through the branches and locked eyes with the great bird. They looked like deep brown bowls recessed into the disk-shaped face of the owl; a beautiful sight. It called again. Its deep cooing resonated throughout the backyard. I retreated back into the living room for the evening feeling a bit exhilarated with I had just experienced. The next day I had an Environmental Science class at a community college and described the owl to my professor. She then informed me that it was what is known as a Barred Owl, scientific name Strix Varia. I then began researching and learning about more and more about the owl.
            According to the zoo.org website’s fact sheet, the Barred Owl, as well as all other owls, are considered Raptors in the avian family. This means they are adept hunters and eat other animals for sustenance. Researching this more fully, I found that the Barred Owl's entire anatomy is geared toward stealth and hunting. Owls have staggered ear openings on either side of their face. This allows the owl to accurately pinpoint where sound is coming from when searching or zeroing-in on an unsuspecting prey. The disk-shaped recesses in the owl's face funnel sound towards these ear openings allowing for more sensitive, and precise hearing. The Barred Owl's eyes are also brown, a trait shared with only one other member of the owl family, the Barn Owl. Like most owls, Strix Varia has an increased number of “cones” in their eyes allowing for clear vision even in low-light conditions. The vertebrate of the Barred Owl is also important in contributing to its effectiveness as a hunter. The vertebrate in the bird's neck contain over twice as many as a humans allowing for excellent mobility and stability in flight. Due to this unique bone structure, the Barred Owl can rotate its head 270 degrees, which is helpful because it cannot move its eyes independently and must rely on turning its head to look around. The neck structure also allows the owl's head to remain stable and stationary during flight which allows the owl to keep its eyes on where a specific location.
            The Barred Owl is commonly referred to as the Hoot Owl by those who are lucky enough to hear its distinctive cry of “Who cooks for you, who cooks for you all.” (http://www.owlpages.com/owls.php?genus=Strix&species=varia) Barred Owls are a very common species, and are found throughout most of the United States, sans the South-West, and most of Canada and into Alaska. They primarily live in hollowed trees sometimes roosting in large openings of dead trees or in nests on large tree limbs. Other times Strix Varia may nest in abandoned hawk, squirrel or crows nests. Barred Owls prefer roosting high in densely foliaged deciduous trees to protect and camouflage itself to the rest of its environment. This prevents the Barred Owl's only predator, the Great Horned Owl, and other territorial owls, from displacing them from their home. (http://www.allaboutbirds.org/guide/Barred_Owl/lifehistory) Barred Owls can be very defensive when protecting their nests as they tend to feed in the general area of their nests as well.
            Eating for the Barred Owl is a fairly uncomplicated task. As a top-predator, Strix Varia has a wide choice of meal options and primarily hunts at night. The Barred Owl will primarily feed on small mammals, such as mice, moles, voles, or squirrels, smaller birds, lizards, frogs and insects. (http://www.fcps.edu/islandcreekes/ecology/barred_owl.htm) This large diet makes the owl fairly common and abundant in populations as it rarely goes hungry. Barred Owls may also sometimes be found in inner-city or urban centers where mice or other rodents may be abundant in number providing an appealing place to make a nest.
            Their diet is also what makes Barred Owl's significant to humans and beneficial in nature. Their diet consists of what most people would consider pest and rodent species that generally are undesirable and unwanted. The owls feast on the insects that may brood a garden or agriculture field. They also eat the mice and moles and other small mammals that may cause structural damage or infestations in buildings and homes. A reduction in the number of owls and other birds of prey may result in booming populations of pest species which could have drastic economic and environmental effects. The Barred Owl is a very helpful and quite spectacular organism to behold, and just so happens to provide pleasant vocals to a summer evening's chorus of chirping crickets and ribbiting frogs.

Thursday, February 2, 2012

Eco-biography

Eco-biography
In 1960, the United States Army Corps of Engineers had embarked on a project to build a dam on the Des Moines River in Marion County approximately 35 miles from Des Moines to control flooding in southeast Iowa and on the Mississippi River. The project, Red Rock Dam, was completed in 1969 and the resulting reservoir was christened Lake Red Rock. Red Rock dam and lake were architectural marvels, creating the largest flood control structure and largest lake in Iowa respectively. The project cost approximately 88 million dollars but expenses were quickly recuperated from the prevention of destruction cause by seasonal flooding annually. In 1993, torrential flooding tore through central and southern Iowa causing almost $15 billion in damages and claiming 30 lives. Some 200,000 residents in Des Moines and the surrounding area were without drinkable water for almost a month. It was also the year my parents filed for divorce.
I was barely four years old at the time and couldn’t remember the gritty details of the divorce or the proceeding settlement or the ongoing custody battle thankfully. What I do remember is the times spent visiting Lake Red Rock with my dad and brother during this period of separation. We would jump into dad’s sports car, grab a few drinks at the local soda fountain, and make the thirty minute trip out to the lake, sometimes three times a week just to see the impact of the rain on the reservoir and the massive deluge of water coming out of the spillways massive flood gates. This powerful image of the floods, and the swollen rivers filled with debris awakened an interest in my head that’s stuck with me since the days of riding in dad’s sports-car. Even now, some 17 years later, when Iowa has a few weeks of hard rain showers, I find myself drawn to Lake Red Rock and Iowa’s other flood control reservoir, Saylorville Lake, with the drive to satisfy that innate fascination with flooding and to perhaps relive some of my early childhood experiences.
In 1995 my father got remarried and thus began the first step of, what I felt, was growing up. I spent most of my childhood in the middle-class town of Indianola, just 15 minutes south of Des Moines. We lived in a blue collar environment in a decent sized ranch home. It was comfortable in an affordable sense. Our vehicles were domestic and well maintained; only Fords in our driveway. My dad, and newly christened step-mother and worked nine to five; my dad was an electrician and my step-mom a beautician. My brother and I would be home alone for a couple hours after school. We usually minded our own business playing with neighborhood kids but never the same ones. We had our own groups. Dad would get home about five thirty and dinner was always done by six thirty. A cup of coffee followed dinner. Life was simple.
            The weekends were spent differently. Dad was off weekends and my step-mother worked weekends, except Sunday, which meant it was guy time on Saturday. Dad was quite the outdoorsman. Almost every Saturday during the spring and early fall, my dad, my brother and I would pack up his American made SUV and head out to the wilderness of Lake Ahquabi to fish or look for morel mushrooms. We would leave at the crack of dawn to beat the frequent rush of other would-be fisherman possibly having guy-time of their own. The highway through Indianola goes directly to the lake, but it was dad's habit to take the back roads all the way there. I enjoyed the gravel more than the paved highway. Despite Iowa being characterized as flat, the state starts to get pretty hilly south of Des Moines and I think that’s what part of the allure of taking the gravel roads was. A series of houses followed by a string of hills that would make anyone’s stomach drop if sped over fast enough led to the turnoff where the abandoned waterworks now sits empty. I loved to look at the thick oak trees that lined each side of the road as we ascended and descended every hill. We would pass agriculture fields and an old, iron-framed bridge covered in graffiti before finally arriving at the lake. The lot of us would get out of the car, grab our plastic grocery sacks or fishing poles and head down the, usually muddy, dirt path from the parking lot to our frequently scoured part of the lake. The path was at the bottom of a hill so all the water runoff would inevitably settle there. We marched down the wooded trail and I would inevitably begin to look around as I gave in to the boredom of the hike. I saw tall reaching trees, pudgy green scaled trees, trees with pointed leaves, and trees with round leaves, grasses with purple flowers, and yellow flowers, sometimes with no flowers at all. We would pass them by without ever noticing their significance. Our feet coated with clay, we set off into the forest with our plastic Wal-Mart and Fareway sacks looking for morel mushrooms.  Passing tree, after tree, stump after stump, fallen limb after fallen limb, we scoured the vast forest for the succulent fungus. I looked around briefly and saw only timber; a vista of wood and plant life unidentifiable and unappreciated by myself at the time.
            My dad always had sound advice on how to find morels, “Stop where you are and look around. When you find one, you usually find a bunch. Look for the umbrella plants too. They like to grow under them. Find a good walking stick so you can just brush the umbrella plants aside to look under them.” Actually, most of my family on my father’s side has always had a good grasp on forestry. My dad used to go raccoon hunting with his father, and his grandfather. My older brother got the spirit of the hunt in him. I went a few times but wasn’t a fan of watching a dead animal being skinned. I do, however, credit the three generations of raccoon hunters as a contributing factor for becoming in environmentalism. I experienced the forest in a similar way the Native Americans did; as a source of livelihood. The natives looked to the forest for sustenance and shelter; the three generations of raccoon hunters before me looked to it for the same purposes albeit in the form of raccoon pelts to sell as part of their own livelihood. Granted, the Native Americans didn’t have spotlights and 22 caliber rifles, but nonetheless I garnered a significant appreciation for the woods.
I recall my first “eco-teacher” that taught a course in Midwestern ecology at Des Moines Area Community College which I attended before transferring to Central. I had needed a science credit and thought the class seemed interesting enough. This was before the sleeping environmentalist had awakened within me, “Can anyone identify any of the trees in this area?” My professor loved rhetorical questions. It was my second year at DMACC and like the hundreds of students that came before me, my professor knew almost no one would answer her; the silence was deafening except for the frequent bird chirps and rustling of the nearby eastern cottonwood tree. “You can always tell an eastern cottonwood by the sound the leaves make in the wind; sounds like clapping yes? Silver maples are commonly found accompanying eastern cottonwoods in areas called Riparian-Floodplain forest. Commonly found in residential areas as well. Silver maples get their name from the silvery color pattern on the underside of their leaves. Both are native species to Iowa and play an important role in this particular ecosystem.” Little did I know that the rest of my college career would be spent studying the very subject matter I was required to learn at that time. A short year later I had the pleasure of taking a similar course here at Central with the incomparable Dr. Russell Benedict, “There are no evergreen trees native to Iowa except the red cedar juniper.” I remember being surprised by that given there are pine trees everywhere in my home neighborhood. “Red cedars are easily identified by their scaled needles, and obvious berries which are used in making gin.” Being of drinking age, that makes perfect sense now. Their scent is almost identical. My interest in the environment began to sprout like a morel in the early spring sunlight. “Shagbark hickory, red oak and white oaks are commonly found in what is appropriately referred to as Oak-Hickory forest. Shagbark hickories are easily identified by their bark, as you can guess, looks shaggy. Species of red oak have the distinctive pointed leaves as members of the white oak family have rounded leaves. Oak-hickory forest is fairly abundant around Iowa and provides habitat for many species of birds and small mammals such as the fox and gray squirrels.” Professor Paul Weihe was my next master under whom I would be apprenticing under. It was his class that solidified my career path in the natural sciences.
Now a senior in college, and my brother living on his own, we don’t get to search the forests for morels as often anymore. We don’t visit our spot in the forest on the hill by the lake as much. We don’t look under every log, every fallen limb, and flip umbrella plants looking for the elusive mushrooms like Dad, my brother and I used to. The infrequent times we get to go out to the lake and search for morels or cast out a line are a much more significant experience to me. I used to see a forest dotted with shrubs and grasses. It is only after many years of questing through the thickets and briars with dad and my brother, and becoming instilled with the knowledge invested in me by academia that I can appreciate that which is around me; the subtle roar of the clapping of Eastern Cottonwood leaves, the silver underside of the thin Silver Maple leaf, the scaled needles and gin scented berries of the Red Cedar Junipers, the pointed leaves of the Red Oak and the round leaves of the White. My outdoor endeavors with my dad and my brother influenced the path I took in the college world. It was the people, the professors, and teachers, that I encountered on that path that would continue to push me to excel and become more involved with the natural sciences then the young community college student ever would have imagined.