The Sixth Extinction? Topic 7 Pg

DID YOU KNOW....  In the last 600 million years, there have been 5 major declines in Earth’s Biodiversity!  In the last 65 million years, the rate at which new species were formed has been greater than the rate of extinction

 Today, the rate of extinction may be 70 extinctions per day! Which type of species is most diverse?

 As the rate of extinction increases, the scales are tipped toward an overall trend of decreasing biodiversity.

How have humans affected Biodiversity?  v=csqJ_ULmQL8 Human Impact (Call of Life) 9 min v=csqJ_ULmQL8

Human Impacts  Some areas of the world support greater biological diversity than others  What promotes the growth of plants, which leads to more complex food chains and greater biodiversity?

Disapprearing Habitats  A grizzly bear is an example of a bioindicator species.  What does that mean?  Species that help indicate environmental change  Usually one of the first effects of human interference in an ecosystem is loss of large carnivores such as bears and wolves

Where Have all the Grizzlies Gone?  Pg. 68  Read “Think About it”  Define extirpation  Work with a partner to study the map and brainstorm possible reasons to explain why grizzly bear populations have decreased  Analyze: #1-4 (work with partner)

The population explosion  Developing nations are often hardest hit by population explosion  Areas of tropical rain forests are often cleared to make small farms  Extinction of particular species  Loss of food and protection  Lack of nutrients in soil  Prevents regrowth in forests

Pains and Gains Topic 8: pg

 How do we deal with the loss of biodiversity?  What do you think? Answer in your notes!

Protected Areas  Protected Areas are preserves, refuges and national parks set up to protect wildlife and habitat.

ZOOS  Educational institution  Protect and preserve endangered animals  Maintain genetic diversity of particular species  Supports research on biodiversity around the world

Seedbanks  Gather and store seeds from plants that are threatened with extinction  Run by different people (governments, individuals)  Preserve genetic diversity

Global treaties  Local and global co-operation  Protect endangered plants and animals  Convention of International Trade of Endangered Species (CITES)  Prevent import and export of animals  Leopards and cheetah skins  Rhinoceros and elephant tusks  Rare birds

 Are there any problems or issues that you see in these diversity- conserving measures?  Answer in your notes!

To do:  Topics 6-8 Wrap Up, 1-7, 9, 10  Due for Monday  Topic 6-8 Quiz will be on Monday!