The vehicle was originally built in 1909 and is now permanently parked outside the museum. Kids seeking hands-on fun can climb aboard Peggy, a vintage steam locomotive. Visitors can view a 10,000 pound (4,536 kg), 5- million-year-old petrified stump of a Giant Sequoia tree. There’s more to explore on the exterior of the Discovery Museum, too. “Travel” to different regions throughout the exhibit, meeting humans who face first-hand the struggle to keep forests in their regions sustainable.Īt Portland’s World Forestry Center, visitors can view a 10,000 pound (4,536 kg), 5-million-year-old petrified stump of a Giant Sequoia tree. Head upstairs to learn about the connection between people and forests and how they interact worldwide. Plus, learn how to operate a Timberjack harvester, discover animals beneath the forest floor or take a “wet-free” raft ride on the Clackamas River! Second Floor: Forests of the World Visitors from near and far can enhance their knowledge of the area’s forests and the unique role they play in the environment. Learn about forest systems and cycles, their importance to streams and rivers and how Oregon’s forests are managed. The first floor of the Discovery Museum, however, focuses specifically on forests of the Pacific Northwest. ![]() The World Forestry Center is dedicated to educating people about the importance of trees and forests worldwide. After the original building was destroyed in a fire in 1964, its new facility was rebuilt near the Oregon Zoo.Ģ of 2 An interactive exhibit at the World Forestry Center First Floor: Pacific Northwest Forests Founded in 1966, the World Forestry Center was created to replace the Forestry Building, a majestic log structure built for the 1905 Lewis and Clark Exposition. This nonprofit organization’s mission is to connect people to the importance of forests and sustainable forestry. ![]() The museum is one of three programs operated by the World Forestry Center. Adults and young ones will learn and be entertained by various simulators and virtual tours. The two-story, 20,000-square-foot (1,858 sq m) facility features Northwest Regional-style architecture and a range of interactive, forest-focused exhibits. ![]() The museum is located in Washington Park and is easily accessible by MAX Light Rail. Tree-and forest-lovers of all ages can learn about sustainability and experience a Portland icon all in one trip by visiting the World Forestry Center Discovery Museum. With FP now documented in the two main branches of extant archosaurs, this discovery offers tantalizing insights into the possible reproductive capabilities of the extinct archosaurian relatives of crocodilians and birds, notably members of Pterosauria and Dinosauria.Ĭrocodylia Dinosauria archosaur facultative parthenogenesis temperature-dependent sex determination terminal fusion automixis.Courtney Tait is a writer from Victoria, B.C. ![]() The data support terminal fusion automixis as the reproductive mechanism a finding which suggests a common evolutionary origin of FP across reptiles, crocodilians and birds. Here, using whole-genome sequencing data, we provide, to our knowledge, the first evidence of FP in a crocodilian, the American crocodile, Crocodylus acutus. The latter group is particularly interesting because unlike all previously documented cases of FP in vertebrates, crocodilians lack sex chromosomes and sex determination is controlled by temperature. Nonetheless, questions remain as to its occurrence outside of these vertebrate lineages, most notably in Chelonia (turtles) and Crocodylia (crocodiles, alligators and gharials). En el estudio de la electricidad, se denomina capacidad (a veces se denomina capacitancia, aunque esta palabra no está registrada en el diccionario DRAE, Real Academia Española), a la propiedad de un conductor de adquirir carga eléctrica cuando es sometido a un potencial eléctrico con respecto a otro en estado neutro. Part of this growth among vertebrate taxa is attributable to awareness of the phenomenon itself and advances in molecular genetics/genomics and bioinformatics, and as such our understanding has developed considerably. This unusual reproductive mode has been documented in birds, non-avian reptiles-specifically lizards and snakes-and elasmobranch fishes. Over the past two decades, there has been an astounding growth in the documentation of vertebrate facultative parthenogenesis (FP).
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