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CHAPTER 11
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Gravity
Terms in this set (12)
endangered species
Wild species with so few individual survivors that the species could soon become extinct in all or most of its natural range
threatened species
Wild species that is still abundant in its natural range but is likely to become endangered because of a decline in numbers
hot spots
Areas with many endemic plant and animals species. These are endangered areas of biodiversity due to loss of habitat
habitat island
Any habitat surrounded by a different one. National parks and other reserves are examples.
habitat fragmentation
Caused by roads, logging, agriculture, and urban development, this phenomenon occurs when a large continuous area of habitat is reduced in area and divided into smaller, more scattered, and isolated patches or habitat islands. This can block migration routes and limit the abilities of some species to find mates and get food.
environmental indicators
provide a more practical and economical way to track the state of the environment than if we attempted to record every possible variable in the environment.
Birds are a good example because they respond quickly to environmental change.
feral
wild and menacing invasive species such as the feral pig( the euro wild boar) and the feral cat. They harm ecosystems.
precautionary approach
Prevention is the best way to reduce threats from invasive species. With this approach, species that are not on an approved list are denied entry into the country. (Australia and New Zealand uses this
DDT
A pesticide that was used during the first half of the 20th century with great success. Rachel Carson discovered its carcinogenic effects on humans.
bioaccumulation
the accumulation of substances, such as pesticides, or other organic chemicals in an organism. DDT can accumulate in the fatty tissues of animals.
biomagnification
the increase in concentration of a substance that occurs in a food chain. More and more of the substance exists as one moves up each trophic level. DDT could exist in very small amounts in many phytoplankton, and when a fish eats a lot of the plankton, all the DDT is stored in the fish. When a bird eats a lot of fish.... and so on
bushmeat
Indigenous people in Africa have sustainably hunted wildlife for this for centuries. This is food consumed as a source of protein by local people in parts of West Africa and sold in the national and international marketplace
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