{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Bio171-F08-lec39 - Biology 171 Lecture 39 Monday December 8...

Info icon This preview shows pages 1–14. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 39: Monday December 8, 2008 Biology 171 Today’s Topic: Looking to the Future Announcements Course Evaluations online Final Exam Tues. Dec 16 7-9PM – covers lectures 30-39 & last 3 discussions Review Sun. Dec 14 4-6PM - 1800 Chem Biodiversity and Conservation Why is Biodiversity important? Threats to Biodiversity ‐ review Hopeful signs: National efforts in conservation Vahatra ‐ Madagascar Health in Harmony – Indonesia Discover Life in America Text Reading Lec. 39: review chapter 55
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Why is Biodiversity important? 1. Ecosystem services, e.g. primary production, nutrient cycling David Tilman (UM Ph.D.) tested whether increasing species richness and functional diversity in a community would affect net primary productivity in Minnesota prairies.
Image of page 2
Why is Biodiversity important? Tilman’s experiments Fig. 55.14
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Why is Biodiversity important? 2. Resistance to disturbance and Resilience following disturbance Tilman’s group also found that more diverse communities showed greater values of these parameters.
Image of page 4
e.g. the anti-cancer drug Taxol derived from the yew tree, Taxus canadensis Why is Biodiversity important? 3. Economic benefits Wild plants, fungi, prokaryotes and animals have been the sources of a vast diversity of valuable products.
Image of page 5

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Why is Biodiversity important? Tilman’s experiments showed that there is some redundancy in natural communities, but how much disturbance and extinction before a tipping point is reached?
Image of page 6
Threats to Biodiversity “Governments should protect the climate system for the benefit of present and future generations of humankind” ‐UN Conference on Environment and Development ‐ Rio de Janiero, 1992 (The “Earth Summit”)
Image of page 7

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Floods on Indian subcontinent Desertification in Africa The last 10 years have been the warmest decade since written records began
Image of page 8
Glacier National Park ‐ 1932 2001 If nothing continues to be done, the UN Intergovernmental Panel on Climate Change warns that temperatures could rise by a global average of 5.8°C (10.4°F) by 2100
Image of page 9

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
By 2002, CO 2 emissions had risen 18.1% above 1990 levels in US Atmospheric CO 2 levels are 30% higher than in pre‐industrial times, rising from 281ppmv in 1800 to 327 in 1972, 356 in 1992, 367 in 2002 And 384 in 2007.
Image of page 10
“National policies and strategies should provide a framework for increased efforts…for the management, conservation and sustainable development of forests and forest lands.” ‐UN Conference on Environment and Development ‐ Rio de Janiero, 1992 Threats to Biodiversity
Image of page 11

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Lake Balinsasayao, central Philippines, 1982 Half of the world’s original forest cover has now been destroyed ‐ 60% of temperate broadleaf & mixed forests, 45% of tropical moist forest & 70% of tropical dry forest
Image of page 12
Remaining forests are being depleted by about 160,000km 2 ‐half the size of Norway‐ every year.
Image of page 13

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 14
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern