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LIVE INTERACTIVE LEARNING @ YOUR DESKTOP. IPY/NSTA Web Seminar: Impact of Polar Climate Change on Living Systems. Thursday, June 14, 2007 6:30 p.m. to 8:00 p.m. Eastern time. Agenda:. Introductions Tec-help info Web Seminar training Presentation Evaluation Chat with the presenter.

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slide1

LIVE INTERACTIVE LEARNING @ YOUR DESKTOP

IPY/NSTA Web Seminar:

Impact of Polar Climate Change on Living Systems

Thursday, June 14, 2007

6:30 p.m. to 8:00 p.m. Eastern time

slide2

Agenda:

  • Introductions
  • Tec-help info
  • Web Seminar training
  • Presentation
  • Evaluation
  • Chat with the presenter
nsta ws staff
NSTA WS Staff

Al ByersAssistant Executive DirectorNSTA

Jeff LaymanTech Support703-312-9384jlayman@nsta.org NSTA

Susan HurstcalderoneScience Teacher Volunteer Chat Moderator

poll 1
Poll #1

How many web seminars have you attended?

  • 1-3
  • 4-5
  • More than 5
  • This is my first web seminar.
  • I don’t know what is a web seminar.

Use the letters A-E located at the top left of your actual screen to answer the poll

poll 2
Poll #2

What grade level do you teach?

  • Elementary School, K-5.
  • Middle School, 6-8.
  • High School, 9-12.
  • I teach college students (undergrad and/or grad students).
  • I am an Informal Educator
slide9

LIVE INTERACTIVE LEARNING @ YOUR DESKTOP

IPY/NSTA Web Seminar:

Impact of Polar Climate Change on Living Systems

Thursday, June 14, 2007

7:00 p.m. to 8:00 p.m. Eastern time

slide10

Cold Microbes: From Global Cycles to Genomes

David Kirchman

College of Marine and Earth Studies

University of Delaware

Lewes, Delaware

slide12

How much has the average global temperature changed due to greenhouse gases and human activity?

  • Not at all.
  • Not at all yet, but may in the future.
  • About 1oC so far, may be as high as 6oC by the year 2100.
  • About 2oC so far, may be as high as 10oC by the year 2100.
slide14

Microbes consume and produce many greenhouse gases, especially CO2

Phytoplankton and other plants

Autotrophs

CO2

Organic Matter + O2

Heterotrophs

Bacteria and animals

slide16

Seawater after staining for DNA

Heterotrophic bacteria (about 0.5 mm)

slide18

Fate of plant (primary) production in the oceans

CO2

Protist grazers

Larger grazers

Bacteria

Detritus

50% in warm oceans

CO2

Phytoplankton (plants)

slide19

Are bacteria and other microbes as “active” in the Arctic as elsewhere?

CO2

Protist grazers

Larger grazers

Bacteria

Detritus

What fraction goes this route in the Arctic?

CO2

Phytoplankton (plants)

slide20

Weak, inactive bacteria  strong classical food chains

Pomeroy and Diebel (1986)

[M. Webber-USFWS]

slide21

Why microbes may not be so active in the Arctic:

It’s cold up there!

-1.7- +5oC in water

-20oC in sea ice

(salinity = 20%)

slide24

How many cells are growing and are active in taking up organic material?

Microautoradiography

1. Incubate with 3H-organic material

2. Fix and filter

3. Embed into photographic film emulsion

4. Develop and analyze

slide25

Bacterium

3H

Microautoradiography: single cell assay for organic material use

3H-amino acids

Photographic film emulsion

slide26

Cells stained for DNA (0.5 mm)

Silver grains, indicating uptake of 3H amino acids

slide27

Arctic bacteria are active, even in freezing water!!

70-100% of cells detectable by FISH

slide29

What have you learned?

Microbes both produce and consume greenhouse gases, like CO2 and methane (CH4).

True

False

slide30

What have you learned?

The biomass (weight) of whales is greater than that of bacteria in the oceans.

True

False

slide31

What types (“species”) of marine bacteria are in the Arctic Ocean and in the global carbon cycle?

slide32

Answers from genomics

ge·nom ic(je’ nom’ ik)adj.The study of the structure and function of large numbers of genes simultaneously.

slide33

Many genomes are now sequenced.

>200 marine microbes now being sequenced

Draft of human genome

2007

slide34

Metagenomics (environmental genomics)

Genes isolated directly from microbial communities without culturing in the lab.

slide35

Lots of marine bacterial “species”, many new and still not isolated.

Torsvik et al. (2002):160

Venter et al. (2004):1,800-45,000

Giovannoni and Rappe (2000)

what you should have learned

What you should have learned:

  • Climate change is real, especially in the Arctic, which is very sensitive to global warming.
  • Microbes are important because of their abundance and their role in consuming and producing greenhouse gases.
  • Data about genomes help us understand microbes in the Arctic and other natural environments.
elluminate logo
Elluminate logo

http://www.elluminate.com

nlc screenshot
NLC screenshot

http://learningcenter.nsta.org

slide41

National Science Teachers Association

Gerry Wheeler, Executive Director

Frank Owens, Associate Executive Director Conferences and Programs

Al Byers, Assistant Executive Director e-Learning

NSTA Web Seminars

Flavio Mendez, Program Manager

Jeff Layman, Technical Coordinator

Susan Hurstcalderone, Volunteer Chat Moderator

LIVE INTERACTIVE LEARNING @ YOUR DESKTOP

slide42

NSDL: Selecting and Using Digital Phenomena and Representations for Middle School Science Instruction

  • June 19, 2007
  • 6:30 PM Eastern Time
slide43

NSTA SciGuides:

Provide tools to quickly and easily locate targeted science content information and teaching resources from NSTA-reviewed science web sites.

http://sciguides.nsta.org

slide44

Web Seminar Evaluation

http://institute.nsta.org/survey/ipylife2.asp