Big Idea 4
2. Biological Magnification
Biological magnification occurs when the concentration of a substance is increased. The case of this milk, it is due to the food chain. Hormones are injected into livestock in order to make them produce milk faster. When we drink the milk, we now have those hormones in us, increasing the concentration of the hormones.
3. Biomes (2)
A. River
Rivers are characterized by their current. In this photo of the the American River, it is hard to see, but the current exists towards the right side of the picture. Animals that live in rivers include fish and invertebrate. Plant life is limited to algae and aquatic plants, although the consumers of the river often use leaves and other organic material from terrestrial plants as a primary food source.
B. Lake
Lake Natoma (pictured) is an example of a lake. It is a reservoir, which is a man-made lake. There are two types of lakes: Oligotrophic, which are nutrient-poor and oxygen-rich, and eutrophic, whiich are nutrient-rich and oxygen-poor. I'm not sure which kind Natoma is, but my best guess is oligotrophic, because it does not have many aquatic plants, indicating that the water is poor in nutrients. Natoma is many different species of fish, along with zooplankton (small drifting animals). The rubber duck is hard to see, but he is on a rock just to the left of the middle of the picture.
9. Introduced Species
This tiger is an introduced species. Introduced species are any species that is living outside of its native distributional range due to human interference. Tigers are native to Asia, not North America. Introduced species typically create increased competition for native species, and are usually considered a bad influence on the native ecosystem.
11. K-strategist
Giraffes are considered K-strategists. K-strategists are organisms that have a small but stable population, low reproduction rate, and long juvenile period. K-strategists prepare fewer but better adapted and equipped offspring than r-strategists.
14. Organisms on different levels of the same food chain (3)
Grass is a producer, and is eaten by...
...zebras, a consumer. Zebras are in turn eaten by...
...lions, also a consumer.
Lake Natoma (pictured) is an example of a lake. It is a reservoir, which is a man-made lake. There are two types of lakes: Oligotrophic, which are nutrient-poor and oxygen-rich, and eutrophic, whiich are nutrient-rich and oxygen-poor. I'm not sure which kind Natoma is, but my best guess is oligotrophic, because it does not have many aquatic plants, indicating that the water is poor in nutrients. Natoma is many different species of fish, along with zooplankton (small drifting animals). The rubber duck is hard to see, but he is on a rock just to the left of the middle of the picture.
9. Introduced Species
This tiger is an introduced species. Introduced species are any species that is living outside of its native distributional range due to human interference. Tigers are native to Asia, not North America. Introduced species typically create increased competition for native species, and are usually considered a bad influence on the native ecosystem.
11. K-strategist
Giraffes are considered K-strategists. K-strategists are organisms that have a small but stable population, low reproduction rate, and long juvenile period. K-strategists prepare fewer but better adapted and equipped offspring than r-strategists.
14. Organisms on different levels of the same food chain (3)
Grass is a producer, and is eaten by...
...zebras, a consumer. Zebras are in turn eaten by...
...lions, also a consumer.
18. Predation
Predation is defined as a predator eating its prey. These fish bones found along the American River are examples of predation. They were likely killed by fishermen, and their bodies were eaten by predatory birds such as seagulls.
19. r-Strategist
Fish are examples of r-strategists. R-strategists are organisms that have a high reproduction rate, short juvenile period, and low survival rates. R-strategists create as many offspring as possible in an attempt to ensure that at least a few will survive and reproduce again. Organisms that are r-strategists include fish, rodents, and insects.
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