PPT-Biodiversity Loss and Species Extinction

Objectives Define the terms extinction extirpation and mass extinction Contrast background extinction rates and periods of mass extinction Evaluate the primary causes of biodiversity loss. Overview. Extinctions are as important in the history of life as are the evolution of new species. Explaining extinctions is just as challenging a scientific question as explaining the evolution of new species. 4.1 Reduction of Biological Diversity. Outcomes. Describe ongoing changes in biological diversity through extinction and extirpation of native species.. 4.1 Reduction of Biological Diversity . Species and ecosystems on Earth and the ecological processes of which they are apart are being stressed by urbanization and the expansion of human industries. The Sixth Mass Extinction. Essential Questions. What is extinction?. Which species have become extinct in modern times? . What are the characteristics of past mass extinctions? . How do modern extinction rates compare with natural (background) rates?. EXTINCT is FOREVER!!. Non-human causes of extinction:. Volcanic events. Ocean temperature change. Sea level changes. Meteorites. Glaciations. Global climate change. Competition/predation. Human causes of extinction/loss of biodiversity - HIPPO. The rise and fall of biodiversity. Four major mass extinctions of marine organisms:. End of Silurian Devonian, Permian, and Cretaceous). Rise in diversity during Cambrian, Silurian, Cretaceous, and Paleogene. The Species Approach. Chapter 9. Core Case Study: . The Passenger Pigeon: Gone Forever. Once the most numerous bird on earth.. In 1858, Passenger Pigeon hunting became a big business.. By 1900 they became extinct from over-harvest and habitat loss.. Wednesday, February 1. st. , 2017. & Friday February 3. rd. , 2017. WHAT CAN WE DO? Eight Priorities for Protecting Biodiversity. Take immediate action . to . preserve. world’s biological . hot spots.. Remember. Operant conditioning extinction differs from classical conditioning extinction. During extinction, responding decreases to baseline levels for both classical and operant conditioning. BUT: Operantly conditioned behavior shows:. It is the variety of all the different living things and their homes on the planet. . BIO. . DIVERSITY. Bio= biological organisms . -living things!. diversity= the amount of variation. What is biodiversity?. Bio = life. Diversity = differences among organisms. Biodiversity. = the variety of living organisms found in an area. Where can you find biodiversity?. Biodiversity varies around the world:. Zebra Mussel . Species Introduction. “Introduced . species are species that have become able to survive and reproduce outside the habitat where they evolved or spread . naturally.” . -. United States Environmental Protection Agency. Saving Species and Ecosystem Services. Bees play a key role in pollination. Globally, about one third of the food supply comes from insect-pollinated plants. Currently, agriculture depends heavily on a single species of bee. . . . Species. . A. . group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding. .. Speciation. . It.  is the . evolutionary.  process by which populations evolve to become distinct . Where did all these species come from?. Can new species form?. How do humans effect biodiversity?. How do we prevent extinction?. Why is it important to have so many different species? (in other words, what roles do they play in an ecosystem?.