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Conserving Life. Biodiversity  The variety of life in an ecosystem.

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Presentation on theme: "Conserving Life. Biodiversity  The variety of life in an ecosystem."— Presentation transcript:

1 Conserving Life

2 Biodiversity  The variety of life in an ecosystem.

3 Biodiversity increases as you near the equator

4 3 most diverse biomes:  Coral Reef  Tropical Rainforest  Wetlands Marsh

5 Why is Biodiversity important?  Beautiful and scenic  Good for our health and an ecosystem’s health  (diet, medicines, and disease prevention)

6 Loss of biodiversity

7 Extinct species  A species once present on Earth but has died out

8 Endangered species  A species in danger of becoming extinct.

9 Threatened species  A species likely to become endangered in the near future.

10 What causes the loss of biodiversity? “HIPPO”  Habitat Loss  Invasive Species  Poaching  Pollution  Over population by humans

11 1. Habitat Loss  Deforestation  Slash and burn  Makes soil more fertile for farming  Nutrient poor soil in rain forest

12 Negative Effects of Deforestation  Loss of habitat – crowds out species  Increases levels of CO 2 – contributing to global warming

13 Encroachment  Slowly moving into a species’ habitat  Examples  Road building & farming and housing development

14 2. Invasive Species  Species that are introduced into an environment they are not originally from  Synonyms for exotic: alien, feral, invasive, introduced

15 Cane Toads  Released on purpose to kill cane beetles  Skin contains deadly toxins  Practically no predators  101 have turned into 200 million over 70 years y/RTGAM.20090326.wcane0326/BNStory/S cience/

16 Fire Ants  Stowed away on ship to Alabama  Sting feels like burn  Kills native insects

17 Killer Bees  More aggressive honey bees  Escaped from lab in Brazil  Kills native bee species


19 Non-harmful invasive species  Wheat  Rice  Dogs  Cats  Horses  Pigs  Cows  Goats

20 How do they arrive?

21 Invasive species in FL A Burmese python attempted to eat an alligator


23 What’s the problem?  Crowd out native species  No predators  Decreases biodiversity

24 3. Poaching  Illegal hunting (killing) OR  Illegally removing a species from its habitat

25 Poached Species  Big Cats – Fur  Elephants – Ivory  Rhinoceros – Horns  Orangutans – Pets  Macaws – Pets “In 2005 there were nearly 88,000 mammals, 1.3 million reptiles and 203 million fish imported illegally into the United States.” -Reuters

26 Poaching

27 4. Pollution  Water Pollution  Air Pollution  Ground Pollution

28 Water Pollution  Pesticides

29 Pesticide Use  Pesticide= chemicals used to kill a pest (rodent, insect, fungus, etc.)  Runoff with rainwater puts it into local water systems.  Disrupts aquatic food chains

30 DDT  Pesticide used to kill mosquitoes  Blamed for decline in bird of prey populations  Fish in polluted water eaten by birds  Travels up the food chain  Top predators (eagles, peregrine falcons) affected most

31  These birds lay eggs with thin shells  U.S. banned DDT in 1972  DDT still used in tropical locations to fight malaria  Some oppose ban due to DDT’s ability to fight malaria

32 Fertilizer Use  Runoff into lakes  Causes rapid algae growth (algae bloom)

33  Algae blocks sunlight and….  Plants die (less oxygen)  Decomposers break down dead plants (& use up oxygen)  No oxygen available to other animals and they “suffocate”

34 Mercury  Mercury released into the air when burned, and mixes with rainfall to get into the water.  Found in high quantities in fish  Can damage nervous and reproductive systems (Pregnant women and young kids at highest risk)

35 Hatters used mercury to shape felt hats and often were poisoned. “Mad as a Hatter” references this.

36 Mercury can accumulate in the food chain.


38  Mercury is often combined with other metals for fillings (ADA says this is safe)

39 Air Pollution  Pollutants released into air usually from burning fossil fuels

40 Air Pollution causes…  Global warming  Ozone depletion  Acid Rain  Carbon Monoxide poisoning

41 Ground Pollution  Soil becomes polluted when air pollutants drift to the ground or when water leaves pollutants behind as it flows through the soil.


43 5. Over Population of Humans

44 Population numbers

45 Overpopulation  As more humans are added to our planet, the demand for natural resources (for energy, food and shelter) increases and more land is cleared for development.


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