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Understanding the Loss of Biodiversity: Factors, Impacts, and the Role of Tropical Rainforests

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ghazi
15 diapositives · 322 Views · Jul 20, 2014

This article explores the various factors contributing to the loss of biodiversity, particularly focusing on tropical rainforests. It discusses the similarities and differences in biodiversity loss across different countries and the factors influencing these variations. Readers will learn about the critical role of tropical rainforests in global biodiversity, their vulnerability to disturbance, and the implications of human activities such as habitat fragmentation, pollution, and overexploitation. By understanding these aspects, we can appreciate the importance of preserving these vital ecosystems.

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  1. Brainstorm • List the factors that you think lead to a loss of diversity. • Do you think the loss of diversity is the same from country to country? • Why / why not?

  2. Learning outcomes • You will all be able to: • Identify the factors that lead to a loss of diversity • Most of you should be able to: • Discuss the value of tropical forests in contributing to global biodiversity • Some of you might be able to: • Explain why tropical rainforests are vulnerable to disturbance.

  3. Natural Hazards Volcanic eruption Avalanche Landslide http://www.uvm.edu http://www.cosmosmagazine.com/news/3025/australia-threat-volcanic-eruption Earthquake http://www.preview-risk.com Tsunami Natural fire http://www.floridaforestservice.com/publications/fires_natural_role.html http://tsun.sscc.ru/ http://library.thinkquest.org/

  4. Environmental disasters Loss of tropical rainforest Oil Spills http://www.guardian.co.uk/environment/2008/may/15/forests.brazil http://library.thinkquest.org/CR0215471/oil_spills.htm

  5. Habitat fragmentation • Pollution: (topic 5) • Spraying of pesticides • Oil spills • Factory emissions • Fertilizer run-off • Toxic chemical in the food chain • Climate change http://wildflowerturfblog.wildflowerturf.co.uk/2012/02/16/habitat-fragmentation/ Overexploitation North Atlantic Bluefin tuna http://my.telegraph.co.uk/blueplanet/page/9/ http://bio1152.nicerweb.com/Locked/media/ch56/overexploitation.html

  6. Introducing non-native species Japanese Knotweed Black rat (Rattusrattus) http://www.cumberlandcd.com/~amcclain/ccwa/knotweed.html http://www.uniprot.org/taxonomy/10117 Rhododendron Grey squirrel homepages.abdn.ac.ukl http://www.donnan.com/rhododendron.htm

  7. Rabbits Red Fox http://animal.discovery.com/mammals/rabbit/ http://www.dpiw.tas.gov.au/inter/nsf/WebPages/LBUN-5K43KE?open Australia Cane Toad Camels http://www.camelsaust.com.au/history.htm http://www.telegraph.co.uk/earth/wildlife/9328504/

  8. Modern Agricultural practices: • GM crops • Monocultures • Pesticides • Spread of disease: • Bird flu • BSE • Tuberculosis • Domesticated to wild and vice versa

  9. Importance of tropical rainforests • Read the article and try to remember as many of the facts as you can… • We will have a test!

  10. See how many you can remember… • If Amazonia were a country, it would be the largest in the world. • More than 20 percent of the world’s is produced in the Amazon Rainforest. • More than half of the world's estimated species of plants, animals and insects live in the tropical rainforests. • One hectare (2.47 acres) may contain over 750 types of and 1500 species of higher plants. • Rainforests once covered of the earth's land surface; now they cover a mere 6% and experts estimate that the last remaining rainforests could be consumed in less than 40 years.

  11. What makes rainforests valuable? • Individually on the piece of paper provided write down your ideas. • Think about the following factors: • Biodiversity • Climate • Oxygen

  12. Another factor - “Green politics” • What do you think “green politics” are? • What do you think is the relationship between rainforests and “green politics”?

  13. Rainforests are often called biodiversity hotspots. What is it that makes them so diverse in terms of species? www.tumblr.com They contain a lot of long-lived species and it has taken thousands of years for them to develop. If they are damaged it will take a long time for them to regenerate. Why?

  14. Read the facts from the National Geographic article “Rain Forest Threats” and relate this to what we have been looking at on the loss and retention of diversity. Using this, write down the factors that make rainforests vulnerable to disappearance. Think about: • The complexity of the ecosystem • Soil nutrients • Human activity http://environment.nationalgeographic.com/environment/habitats/rainforest-threats/

  15. Check learning outcome booklets • You should be able to do: • 4.2.1 – identify factors that lead to loss of biodiversity • 4.2.2 – discuss the perceived vulnerability of tropical rainforests and their relative value in contributing to global biodiversity