PPT-Extinctions: The End of Biodiversity

What is extinction Extinctions occur when the last individual of a species dies out Functional Extinctions occur when individuals remain but the odds of sustainable reproduction are low ie the species is effectively extinct even though individuals remain . The complexity and rich diversity of life found in forests provides many vital services to human beings Nonetheless humans are destroying forest biodiversity at an alarming rate The conversion of forests to agricultural land overgrazing unsustainabl Mass extinctions are global events characterized by unusually high rates of extinction The magnitude of these rates is usu ally unspecified but it is generally significantly higher than the rate of so called background extinctions that is extinc tio The struggle for life on earth. Mass Extinction - Definition. A significant proportion of species become extinct (between 30% and 95%) . The extinctions operate across a wide range of environments and . 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. 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?. The sixth . m. ass . e. xtinction. Objectives. Define . extinction.. Give examples of (1) past mass extinctions (2) and recent species . extinctions.. Compare current extinction rates with background extinction . Very general images. What is with the . zig. . zag. ? . Has the earth cooling-shows really deep time!. Shows Cambrian Explosion period.. Mentions algae and eukaryotic cells.. Has all groups! Nice sense of how things evolved. Not straight hard to follow. Hard to tell . 1) Geological Time Scale. 2) Major Episodes in History of Life. 3) Extinctions and Radiations. Today. ’. s OUTLINE:. Geology plays an Important role in Evolutionary Thinking. Patterns of extinctions and evolutionary change in the fossil record were among the main influences on. Opportunities and. Adaptive Radiations. Overview. Extinctions. Adaptive Radiations—New Niches. Stem mammals survived and experience adaptive radiation.. Evolution of birds, feathers, flight, and flightlessness.. 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. Global warming is a key threat to biodiversity but few researchers have assessed the magnitude2climates calculated changes in habitatnumerous uncertainties in this approach we undertook a sensitivity 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. Extinction . When an organism is classed as extinct there are no living members of that species left. Extinction is a natural process where organisms that are less suited to an environment die out. Throughout the history of earth there have been several mass extinction events . UPDATE ON PROCESS AND UPDATED ZERO DRAFT . OEWG Co-Chairs. Francis Ogwal. Basile van Havre. 18 SEPTEMBER 2020 . Special Briefing Session. Presentation Plan. Process. Planning assumptions. Roles of subsidiary bodies and working group.