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Terms in this set (15)
What are two ways in which biodiversity is valuable?
It has both economic(means money) value and ecological value within an ecosystem.
What economic reasons could you give people in the rain forest for preserving the ecosystem?
Many plants, and animals and many other types of organisms have economic value. They provide food and raw materials for medicines, clothing, and other products. For example, taxol, a cancer-fighting chemical, was first discovered in the Pacific yew tree. Also the rainforest is a big tourist attraction and thats how a lot of people in South America make their living, and that is how they save the rain forest from being destroyed.
What are three factors that affect the biodiversity in an ecosystem?
Factors that affect biodiversity is an ecosystem include area(the bigger the area the better lives the animals will have), climate(helps grow food), and diversity niches.
Would you expect to find great biodiversity in the tundra biome? Why or why not?
The rainforest has more biodiversity, because there is more food there, and in the tundra there is not much sunlight and its a very cold environment, therefore vegetation is not plentiful, like in the rainforest.
Name four human activities that can threaten biodiversity.
Pouching (illegal hunting)
Introduction to exotic species. (exotic species that is in a habitat that doesn't belong there) (but they survive here, and they normally cause problems like fire ants) they actually came from central America, and now they are threatening many of our endangered species. (also like kuszoo it came from japan in the 1800s, but it survives here but it makes many problems, like taking over animal habitats, and suffocating trees.
Black bears are roaming through a new housing development in search of food, even though the housing development is still surrounded by forest. How can you account for the bears' behavior?
The black bears are doing this because there habitats are being destroyed and they need to have a lot of room to roam. So because of their natural habitats are being torn down or destroyed they have no where else to go, so they may pop up on human populated areas.
What are three approaches to protecting biodiversity?
1. Captive breeding
2.Laws and treaties
For each approach to protecting biodiversity, list at least one factor that might limit its success
8. All of the preservation are very expensive, also its very difficult to get the government to agree, because they need certain roads to go certain places. Also they want building to be built there so that the government to make money. Also laws and treaties to help protect the endangered species are extremely hard to enforce.
List some ways in which those limitations might be dealt with
You could make treaties like,The most important international treaty protecting wildlife is the Convention on International Trade in Endangered Species. This treaty lists more than 800 threatened and endangered species that cannot be traded for profit. Treaties like this are difficult to enforce. Even so, this treaty has helped to protect many endangered species, including African elephants.
Why are forests considered renewable resources?
Because new trees can be planted to replace trees that are cut down, forests can be renewable resources.
How does the clear-cutting logging method differ from selective cutting
Clear cutting is the process of cutting down all the trees in an area at once. Cutting down only some trees in a forest and leaving a mix of tree sizes and species behind is called selective cutting.
You are walking in a clear-cut section of forest a few days after a heavy rainstorm. A nearby stream is very muddy and has many dead fish. What might have happened?
When an area of forest is clear-cut, the ecosystem changes. After clear-cutting, the soil is exposed to wind and rain. Without the protection of the tree roots, the soil is more easily blown or washed away. Soil washed into streams may harm the fish and other organisms that live there.
What are four ways fisheries can be managed for a sustainable yield?
Managing fisheries for a sustainable yield includes strategies such as setting fishing limits, changing fishing methods, developing aquaculture techniques, and finding new resources.
What are two kinds of laws that regulate fishing? How can they help ensure the health of a fishery
Laws can ban the fishing of certain species. Laws may also limit the number or size of fish that can be caught or require that fish be within a certain range of sizes. These laws ensure that young fish survive long enough to reproduce and that all of the largest adult fish aren't caught. If a fishery has been severely overfished, however, the government may ban fishing completely until the populations recover.
Today many fishing crews use nets with a larger mesh size that allow small, young fish to escape. In addition, many other fishing practices are regulated by laws. Some fishing methods have been outlawed. These methods include poisoning fish with cyanide and stunning them by exploding dynamite underwater. These techniques harm all the fish in an area rather than targeting certain fish.
What might happen to a fish population over time if all the largest fish in the population were caught? Explain
Well than it may hurt other species that ate those large fish, also then there would be no more large fish for the humans to catch because we are catching them faster than they can breed, so than the whole ecosystem of the ocean would be confused and messed up