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Teachers' Domain - Digital Media for the Classroom and Professional Development Search Teachers' Domain Go User: My Folders Loading... Create a new folder Upload Media My Groups No groups created yet. Create a new Group Join a Group My Profile HELP | SIGN OUT Please sign in for full access This Teachers' Domain feature requires registration, which is simple, safe, and free. Register Now Citation "An Origin of Species." Teachers' Domain. 26 Sep. 2003. Web. 3 Feb. 2012. .

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Signing in now will connect your and Teachers' Domain accounts, so that in the future you will automatically be signed into Teachers' Domain when you come from . An Origin of Species Resource for Grades 9-12 | Citation Media Type: Interactive Running Time: Size: 246.3 KB View SAVE TO FOLDER Loading... Save Cancel Share | Source: Evolution Web site Resource Produced by: Collection Developed by: Collection Credits Collection Funded by: See Also: National K -12 Subject: Deep Time/History of Life History of Evolution Processes of Evolution Lesson Plans Using this Resource: How New Species Evolve Explore what Darwin dubbed the "mystery of mysteries": the origin of species. But in this Evolution Web feature, you'll get to see something Darwin only dreamed of: millions of years of evolution occurring in just minutes. Follow the evolution of the fictitious pollenpeeper bird as it adapts to different ecological niches, radiating into a wide variety of distinct species. Background Essay The term evolution refers to the cumulative change that occurs inpopulations of organisms over time. Sometimes evolutionary change is sodramatic that different populations of the same species diverge to becometwo or more distinct species. In the case of a group of birds calledhoneycreepers, for example, a single species that colonized the HawaiʻianIslands about 5 million years ago ultimately diverged into 57 differentspecies. This process, which evolutionary biologists callspeciation or adaptive radiation, can happen anywhere. However, it ismost clearly demonstrated on geologically young land masses, such asnewly formed islands or mountains. In these environments a populationof organisms will typically find a set of environmental opportunitiesand pressures very different from the conditions they experiencedin their place of origin. These environmental differences come inmany forms and often cause sweeping evolutionary changes in a foundingpopulation. Several environmental factors affect the processof speciation. The structural habitat of an area determines the ease withwhich creatures are able to move around and find shelter from weatherand other organisms. Food, both the type and its availability, dictatesthe ease with which animals are able to acquire the energy they need tosurvive and reproduce. Competition for various resourcesis another factor that can drive the process of speciation. Competitivepressure can come from organisms of the same species or from organismsof different species. Generally, in highly competitive environments,traits that minimize competition — traits that, for example, allow twodifferent populations to feed on very different types of food — areadvantageous. Another factor that can influence speciationis predation. Predators typically reduce the rate of speciation becausethey limit other organisms' access to resources. On newly formed landmasses, however, the number of predators is typically lower than onolder continents. These younger environments, therefore, provide moreopportunities for species to evolve into new and different species. Print Background Essay Discussion Questions Describe some of the physical changes in the pollenpeeper species. What are some of the environmental factors that influence the passing of varying traits from generation to generation? Where did the greatest change in the species occur? Why? 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