biological diversity. biodiversity the variety of species in a specific area. the variety of species...

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Biological Diversity Slide 2 Biodiversity The variety of species in a specific area. The variety of species in a specific area. Easily measured by counting the number of species living in an area. Easily measured by counting the number of species living in an area. Increases closer to the equator. Increases closer to the equator. Slide 3 Why is biodiversity important? Organisms are interdependent. Organisms are interdependent. Populations have adapted to live together in communities. Populations have adapted to live together in communities. Brings stability to ecosystems. Brings stability to ecosystems. Humans depend on other species for food, respiration, medicine, and raw materials. Humans depend on other species for food, respiration, medicine, and raw materials. Slide 4 Extinction The disappearance of a species when the last of its members dies. The disappearance of a species when the last of its members dies. Natural process, resulting in both mass extinction and background extinction (Loss of one species per million species per year). Natural process, resulting in both mass extinction and background extinction (Loss of one species per million species per year). The current rate of extinction is much higher than this. The current rate of extinction is much higher than this. Slide 5 Endangered Species A species is considered to be endangered when its numbers become so low that extinction is possible. A species is considered to be endangered when its numbers become so low that extinction is possible. Slide 6 Threatened Species The population of a species is said to be threatened when it is likely to become endangered. The population of a species is said to be threatened when it is likely to become endangered. Slide 7 Exotic Species New species introduced into an ecosystem, either intentionally or unintentionally. New species introduced into an ecosystem, either intentionally or unintentionally. When introduced, exotic species are not as vulnerable to competition and predation as other species and can grow at a very quick rate. When introduced, exotic species are not as vulnerable to competition and predation as other species and can grow at a very quick rate. Exotic species often severely decrease the population size of species already present. Exotic species often severely decrease the population size of species already present. Slide 8 Habitat Loss One of the biggest reasons for decline in biodiversity. One of the biggest reasons for decline in biodiversity. Examples: Rainforests and Coral Reefs Examples: Rainforests and Coral Reefs Slide 9 Habitat Fragmentation Separation of wilderness areas form other wilderness areas. Separation of wilderness areas form other wilderness areas. Contributes to: Contributes to: Increased extinction of local species. Increased extinction of local species. Disruption of ecological processes. Disruption of ecological processes. Increased risk of fire. Increased risk of fire. Changes in local climate. Changes in local climate. New opportunities for invasions by introduced or exotic species. New opportunities for invasions by introduced or exotic species. Slide 10 Habitat Fragmentation The smaller the fragment is the less biodiversity it has. The smaller the fragment is the less biodiversity it has. Geographic isolation can lead to genetic isolation. Geographic isolation can lead to genetic isolation. Slide 11 Edge Effect The edge of a habitat or ecosystem is where one habitat or ecosystem meets another. The edge of a habitat or ecosystem is where one habitat or ecosystem meets another. The differing conditions which exists along the boundaries of a habitat or ecosystem are called edge effects. The differing conditions which exists along the boundaries of a habitat or ecosystem are called edge effects. Slide 12 Edge Effect Edges tend to have greater biodiversity because different habitats with different species are brought together, along with two different sets of abiotic factors. Edges tend to have greater biodiversity because different habitats with different species are brought together, along with two different sets of abiotic factors. When an edge changes, animals might migrate from their current area to the new edge, bringing different species into contact with one another. When an edge changes, animals might migrate from their current area to the new edge, bringing different species into contact with one another. Slide 13 Habitat Degradation The damage of a habitat by pollution. The damage of a habitat by pollution. Three types of pollution: Three types of pollution: Air Air Water Water Land Land Slide 14 Air Pollution Pollutants can enter the atmosphere in many ways, including volcanic eruptions, forest fires, and burning fossil fuels. Pollutants can enter the atmosphere in many ways, including volcanic eruptions, forest fires, and burning fossil fuels. Slide 15 Air Pollution Acid Precipitation Acid Precipitation Rain, snow, sleet, and fog with low pH values. Rain, snow, sleet, and fog with low pH values. Has been linked to the deterioration of some forests and lakes. Has been linked to the deterioration of some forests and lakes. Slide 16 Air Pollution Acid Precipitation Acid Precipitation Sulfur dioxide from coal burning and nitrogen oxides from auto exhaust combine with the water vapor in the air to form acidic droplets of water vapor. Sulfur dioxide from coal burning and nitrogen oxides from auto exhaust combine with the water vapor in the air to form acidic droplets of water vapor. This precipitation leaches calcium, potassium, and other nutrients form the soil leading to the damage and death of plants and trees. This precipitation leaches calcium, potassium, and other nutrients form the soil leading to the damage and death of plants and trees. When added to the water cycle, acid rain also degrades lake ecosystems. When added to the water cycle, acid rain also degrades lake ecosystems. Slide 17 Air Pollution Ozone Ozone Compound consisting of three oxygen atoms. Compound consisting of three oxygen atoms. Found in the atmosphere between 15 and 35 km altitude. Found in the atmosphere between 15 and 35 km altitude. This layer of ozone absorbs ultraviolet waves from the sun, reducing the amount of radiation received by organisms on the surface. This layer of ozone absorbs ultraviolet waves from the sun, reducing the amount of radiation received by organisms on the surface. Slide 18 Air Pollution Ozone Ozone The Antarctic ozone hole is a reduction of up to 60% in the ozone layer over some parts of Antarctica during the spring. (The ozone then increases over the summer.) The Antarctic ozone hole is a reduction of up to 60% in the ozone layer over some parts of Antarctica during the spring. (The ozone then increases over the summer.) This hole is caused by human-produced chemicals, such as chlorofluorocarbons. This hole is caused by human-produced chemicals, such as chlorofluorocarbons. Smaller, seasonal reductions are seen over the Artic. Smaller, seasonal reductions are seen over the Artic. Slide 19 Water Pollution Degrades aquatic habitats in streams, rivers, lakes, and oceans. Degrades aquatic habitats in streams, rivers, lakes, and oceans. Examples: Examples: Excess fertilizers and animal wastes can be carried to waterways by rain. The increase in nutrients cause algal blooms (excessive growth of algae). As the algae die, they sink and decay, removing needed oxygen form the water. Excess fertilizers and animal wastes can be carried to waterways by rain. The increase in nutrients cause algal blooms (excessive growth of algae). As the algae die, they sink and decay, removing needed oxygen form the water. Slide 20 Water Pollution Examples: Examples: Silt from eroded soils can clog the gills of fish. Silt from eroded soils can clog the gills of fish. Detergents, heavy metals, and industrial chemicals can cause death in aquatic organisms. Detergents, heavy metals, and industrial chemicals can cause death in aquatic organisms. Slide 21 Land Pollution Examples: Examples: The average American produces 1.8 kg of waste daily. Although some of this waste may decompose quickly, most trash becomes buried in landfills. Strict controls on landfills are designed to lessen contamination of groundwater. The average American produces 1.8 kg of waste daily. Although some of this waste may decompose quickly, most trash becomes buried in landfills. Strict controls on landfills are designed to lessen contamination of groundwater. Use of chemicals, such as DDT can both harm organisms and lead to habitat degradation. Use of chemicals, such as DDT can both harm organisms and lead to habitat degradation. Slide 22 Natural Resources Parts of the environment that are useful or necessary for living organisms. Parts of the environment that are useful or necessary for living organisms. Include sunlight, water, air, and plant or animal resources. Include sunlight, water, air, and plant or animal resources. Slide 23 Conservation Biology Study and implementation of methods to protect biodiversity. Study and implementation of methods to protect biodiversity. Based on principles of ecology. Based on principles of ecology. Slide 24 U.S. Endangered Species Act Became law in 1973. Became law in 1973. Illegal to harm any species on the endangered or threatened species list. Illegal to harm any species on the endangered or threatened species list. Illegal for federal agencies to fund any project that would harm any organisms on these lists. Illegal for federal agencies to fund any project that would harm any organisms on these lists. This includes changing an ecosystem where endangered or threatened species live. This includes changing an ecosystem where endangered or threatened species live. Slide 25 Convention on International Trade in Endangered Species (CITES) Established lists of species for which international trade is prohibited or controlled. Es

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