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Stephen Alfred Forbes
Stephen Alfred Forbes (May 29, 1844 – March 13, 1930) was the first chief of the Illinois Natural History Survey, a founder of aquatic ecosystem science and a dominant figure in the rise of American ecology. His publications are striking for their merger of extensive field observations with conceptual insights. Forbes believed that ecological knowledge was fundamental for human well being. Forbes was important to the development of ecological theory. He was acknowledged by the National Academy of Sciences as "the founder of the science of ecology in the United States". While already famous as an economic entomologist, Forbes undertook studies of massive fish mortality in Lake Mendota, Wisconsin. He showed the connection of algae blooms and lake physics to fish kills, and embarked on a remarkable research program into lake ecology and river ecology. Many of his insights about lake ecology were collected in an influential paper, "The Lake as a Microcosm". Notable for both co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silver Creek Township, Stephenson County, Illinois
Silver Creek Township is a township in Stephenson County, Illinois. As of the 2010 census, its population was 696 and it contained 332 housing units. Geography Silver Creek is Townships 26 and 27 (part) North, Range 8 East of the Fourth Principal Meridian. Silver Creek Township is located at at an elevation of . According to the 2010 census, the township has a total area of , of which (or 99.94%) is land and (or 0.06%) is water. Silver Creek Township borders the city of Freeport Freeport, a variant of free port, may refer to: Places United States *Freeport, California *Freeport, Florida *Freeport, Illinois *Freeport, Indiana *Freeport, Iowa *Freeport, Kansas *Freeport, Maine, a New England town **Freeport (CDP), Maine, the ..., the county seat of Stephenson County, to the northwest. History Thomas Craine first settled Silver Creek Township in August 1835. Mills Brown's Mill was built four miles east of Freeport on the Pecatonica River by Caleb W. Brown in 1857. The stone ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fish Kill
The term fish kill, known also as fish die-off, refers to a localized die-off of fish populations which may also be associated with more generalized mortality of aquatic life.University of Florida. Gainesville, FL (2005) ''Plant Management in Florida's Waters.'' The most common cause is reduced oxygen in the water, which in turn may be due to factors such as drought, algae bloom, overpopulation, or a sustained increase in water temperature. Infectious diseases and parasites can also lead to fish kill. Toxicity is a real but far less common cause of fish kill. Fish kills are often the first visible signs of environmental stress and are usually investigated as a matter of urgency by environmental agencies to determine the cause of the kill. Many fish species have a relatively low tolerance of variations in environmental conditions and their death is often a potent indicator of problems in their environment that may be affecting other animals and plants and may have a direct impa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States National Academy Of Sciences
The National Academy of Sciences (NAS) is a United States nonprofit, non-governmental organization. NAS is part of the National Academies of Sciences, Engineering, and Medicine, along with the National Academy of Engineering (NAE) and the National Academy of Medicine (NAM). As a national academy, new members of the organization are elected annually by current members, based on their distinguished and continuing achievements in original research. Election to the National Academy is one of the highest honors in the scientific field. Members of the National Academy of Sciences serve '' pro bono'' as "advisers to the nation" on science, engineering, and medicine. The group holds a congressional charter under Title 36 of the United States Code. Founded in 1863 as a result of an Act of Congress that was approved by Abraham Lincoln, the NAS is charged with "providing independent, objective advice to the nation on matters related to science and technology. ... to provide sci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Illinois At Urbana–Champaign
The University of Illinois Urbana-Champaign (U of I, Illinois, University of Illinois, or UIUC) is a public land-grant research university in Illinois in the twin cities of Champaign and Urbana. It is the flagship institution of the University of Illinois system and was founded in 1867. Enrolling over 56,000 undergraduate and graduate students, the University of Illinois is one of the largest public universities by enrollment in the country. The University of Illinois Urbana-Champaign is a member of the Association of American Universities and is classified among "R1: Doctoral Universities – Very high research activity". In fiscal year 2019, research expenditures at Illinois totaled $652 million. The campus library system possesses the second-largest university library in the United States by holdings after Harvard University. The university also hosts the National Center for Supercomputing Applications and is home to the fastest supercomputer on a university campus. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Wesley Powell
John Wesley Powell (March 24, 1834 – September 23, 1902) was an American geologist, U.S. Army soldier, explorer of the American West, professor at Illinois Wesleyan University, and director of major scientific and cultural institutions. He is famous for his 1869 geographic expedition, a three-month river trip down the Green and Colorado rivers, including the first official U.S. government-sponsored passage through the Grand Canyon. Powell was appointed by US President James A. Garfield to serve as the second director of the U.S. Geological Survey (1881–1894) and proposed, for development of the arid West, policies that were prescient for his accurate evaluation of conditions. Two years prior to his service as director of the U.S. Geological Survey, Major Powell had become the first director of the Bureau of Ethnology at the Smithsonian Institution where he supported linguistic and sociological research and publications. Biography Early life Powell was born in M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Union Army
During the American Civil War, the Union Army, also known as the Federal Army and the Northern Army, referring to the United States Army, was the land force that fought to preserve the Union of the collective states. It proved essential to the preservation of the United States as a working, viable republic. The Union Army was made up of the permanent regular army of the United States, but further fortified, augmented, and strengthened by the many temporary units of dedicated volunteers, as well as including those who were drafted in to service as conscripts. To this end, the Union Army fought and ultimately triumphed over the efforts of the Confederate States Army in the American Civil War. Over the course of the war, 2,128,948 men enlisted in the Union Army, including 178,895 colored troops; 25% of the white men who served were immigrants, and further 25% were first generation Americans.McPherson, pp.36–37. Of these soldiers, 596,670 were killed, wounded or went missi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lincoln–Douglas Debates
The Lincoln–Douglas debates were a series of seven debates between Abraham Lincoln, the Republican Party candidate for the United States Senate from Illinois, and incumbent Senator Stephen Douglas, the Democratic Party candidate. Until the Seventeenth Amendment to the United States Constitution, which provides that senators shall be elected by the people of their states, was ratified in 1913, senators were elected by their respective state legislatures, so Lincoln and Douglas were trying to win the votes of the Illinois General Assembly for their respective parties. The debates were designed to generate publicity—some of the first examples of what later would be called media events. For Lincoln, they were an opportunity to raise both his national profile and the burgeoning Republican Party, while Douglas sought to defend his record—especially his leading role in the doctrine of popular sovereignty and its incarnation in the Kansas–Nebraska Act of 1854. The candidat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Normal, Illinois
Normal is a town in McLean County, Illinois, United States. As of the 2020 census, the town's population was 52,736. Normal is the smaller of two principal municipalities of the Bloomington–Normal metropolitan area, and Illinois' seventh most populous community outside the Chicago metropolitan area. As of 2022, Chris Koos has been Normal's mayor since 2003. The main campus of Illinois' oldest public university, Illinois State University, a fully accredited four-year institution, is in Normal, as is Heartland Community College, a fully accredited two-year institution. There was also a satellite campus of Lincoln College, which offered associate degrees as well as four-year programs. History The town was laid out with the name North Bloomington on June 7, 1854 by Joseph Parkinson. From its founding, it was generally recognized that Jesse W. Fell was the force behind the creation of the town. He had arranged for the new railroad, which would soon become the Chicago and A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Civil War
The American Civil War (April 12, 1861 – May 26, 1865; also known by Names of the American Civil War, other names) was a civil war in the United States. It was fought between the Union (American Civil War), Union ("the North") and the Confederate States of America, Confederacy ("the South"), the latter formed by U.S. state, states that had secession, seceded. The central Origins of the American Civil War, cause of the war was the dispute over whether Slavery in the United States, slavery would be permitted to expand into the western territories, leading to more slave states, or be prevented from doing so, which was widely believed would place slavery on a course of ultimate extinction. Timeline of events leading to the American Civil War, Decades of political controversy over slavery were brought to a head by the victory in the 1860 United States presidential election, 1860 U.S. presidential election of Abraham Lincoln, who opposed slavery's expansion into the west. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Freeport, Illinois
Freeport is the county seat and largest city of Stephenson County, Illinois, United States. The population was 23,973 at the 2020 census, and the mayor of Freeport is Jodi Miller, elected in 2017. Freeport is known for hosting the second Lincoln-Douglas debate of 1858, and as "Pretzel City, USA", due to a popular local German bakery known for its pretzels in the 1850s. Freeport High School's mascot is the Pretzel to honor its heritage. History The community was originally called Winneshiek. When it was incorporated, the new municipality took its name from the generosity of Tutty Baker, who was credited with running a "free port" on the Pecatonica River. The name "Winneshiek" was later adopted, and is preserved to this day, by the Freeport Community Theatre Group. In 1837, Stephenson County was formed and Freeport became its seat of government in 1838. Linked by a stagecoach with Chicago, the community grew rapidly. In 1840, a frame courthouse was erected and the first school ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trophic Dynamics
A food web is the natural interconnection of food chains and a graphical representation of what-eats-what in an ecological community. Another name for food web is consumer-resource system. Ecologists can broadly lump all life forms into one of two categories called trophic levels: 1) the autotrophs, and 2) the heterotrophs. To maintain their bodies, grow, develop, and to reproduce, autotrophs produce organic matter from inorganic substances, including both minerals and gases such as carbon dioxide. These chemical reactions require energy, which mainly comes from the Sun and largely by photosynthesis, although a very small amount comes from bioelectrogenesis in wetlands, and mineral electron donors in hydrothermal vents and hot springs. These trophic levels are not binary, but form a gradient that includes complete autotrophs, which obtain their sole source of carbon from the atmosphere, mixotrophs (such as carnivorous plants), which are autotrophic organisms t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Behavioral Ecology
Behavioral ecology, also spelled behavioural ecology, is the study of the evolutionary basis for animal behavior due to ecological pressures. Behavioral ecology emerged from ethology after Niko Tinbergen outlined four questions to address when studying animal behaviors: What are the proximate causes, ontogeny, survival value, and phylogeny of a behavior? If an organism has a trait that provides a selective advantage (i.e., has adaptive significance) in its environment, then natural selection favors it. Adaptive significance refers to the expression of a trait that affects fitness, measured by an individual's reproductive success. Adaptive traits are those that produce more copies of the individual's genes in future generations. Maladaptive traits are those that leave fewer. For example, if a bird that can call more loudly attracts more mates, then a loud call is an adaptive trait for that species because a louder bird mates more frequently than less loud birds—thus se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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