Threats to Biodiversity/Sustainability
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1 Threats to Biodiversity/Sustainability
2 What is biodiversity? We talked about this earlier in the year- chat with your neighbor and see if you can remember: 1) What does biodiversity measure? 2) What does a high or low biodiversity tell you about the ecosystem you are looking at?
3 Biodiversity measures the variety of life in an ecosystem. The more biodiversity = the higher the number of unique species in the ecosystem.
4 An ecosystem s health is typically measured by how much biodiversity it has. The loss of even a single species can threaten the overall stability of an ecosystem.
5 Previous Mass Extinctions
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9 What decreases Biodiversity? The three big ones are: Habitat Loss Introduction of new species Poaching
10 As humans take up more and more land, there is less wilderness available for organisms and many risk going extinct. Habitat fragmentation occurs when a barrier forms that prevents an organism from accessing its home range. Loss of Habitat Wildlife crossing to prevent fragmentation.
11 Introduced Species An introduced species is any organism that was brought to an ecosystem as a result of human actions. If an environment has a niche that the introduced species can exploit, or if the introduced species is a better competitor, original species may be pushed out or die. This particularly happens when there are no predators for the introduced species. When an introduced species has established itself in a new ecosystem, it is called an invasive species. Nile Perch Kudzu Burmese Python
12 Invasive Species
13 Poaching Poaching is the illegal hunting, capturing or killing of wild animals. People may poach for: - Food - To sell products from the animal on the international market - The animal may be considered dangerous or a pest - Traditional medicines or ceremonies
14 Poaching The black rhino in Africa, is good example of a population that has declined dramatically do to poaching. Current numbers are at 5,055
15 Poaching The western black rhino (a subspecies of the black rhino) actually went extinct just last year in 2013 =(
16 Sustainability and Conservation Sustainable development is a practice in which natural resources are used and managed in a way that meets current needs without hurting future generations. Two Types of Natural Resources: 1) Renewable 2) Nonrenewable
17 Human pressure on natural resources Two types of natural resources: Renewable: resources that cannot be used up, or replenish themselves over time. Wind Wood Fresh-water Fish Nonrenewable: resources that are used up faster than they are formed. Coal Oil Nuclear Natural Gas
18 Coal and Oil Formation Both are Fossil Fuels: remains of plants and animals that died anywhere from 400 million to 1 million years ago. Called Buried Sunshine because organisms stored energy from the sun, buried under sediment over time. The heat and pressure from the overlying sediment creates the fuel. Both are made largely of carbon, which gives off a lot of energy when burned. How is Coal different than Oil? Coal is formed from organisms (mostly plants) that lived on land typically in swamps. Oil is formed from organisms (mostly plankton) that lived in the oceans.
19 Sustainability and Conservation Example of sustainable development: Global Fisheries: Overfishing has depleted fish populations worldwide. Fish stocks are not as hardy as they once were. One reason for this is that the fish that are caught represent the healthy, reproducing age groups of the fish population.
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21 Researchers found that 29 percent of species had been fished so heavily or were so affected by pollution or habitat loss that they were down to 10 percent of previous levels, their definition of collapse. To continue fishing at our current rate, the year we see a collapse in 100% of species is quite surprisingly within our lifetimes: 2048
22 In fact 90% of large ocean fish are already gone according to a recent study.
23 The Atlantic cod has, for many centuries, sustained major fisheries on both sides of the Atlantic. However, the North American fisheries have now largely collapsed.
24 Making Fisheries Sustainable 1) Rotation: rotating catches between different species gives the off species time to recover their numbers. Bottom-Trawling 2) Fishing Gear Review: choosing gear that doesn t hurt the sea floor or unintentionally catch other species. 3) Harvest Reduction: Slowing the harvests of deep-water species that grow very slowly allows more time for them to recover. Bottom-Trawling catch 4) Fishing Bans: Creating and enforcing bans in certain areas and on certain species helps to replenish numerous populations in the area.
25 Which species do we save? Some species are so clearly critical to the functioning of an ecosystem that they are called keystone species. One example of a keystone species is the sea otter. In the 1800 s, sea otters were hunted for their fur. They disappeared from the Pacific coast of the U.S. Sea Urchins, with no more predators, multiplied and ate all of the kelp. The kelp beds began to disappear from the area. In 1937, a small group of surviving otters was discovered. With protection and scientific efforts, the otter population grew. The otters once again preyed on the sea urchins. The kelp beds regenerated.
26 Which species do we save? Conservationists try to focus efforts on umbrella species, which are species whose being protected leads to the preservation of its habitat and all the other organisms in its community. Manatee Bay Checkerspot Butterfly
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