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communities of organisms such as sea stars, snails, and barnacles. A large area can be an ecosystem, and parts of that area can be ecosystems as well. The 700-square-mile Okefenokee Swamp is a large ecosystem with many smaller ecosystems contained within it. Clumps of reeds, groups of aquatic plants, stretches of open water, and stands of trees form smaller ecosystems within the swamp. A community of organisms and its abiotic factors make up an ecosystem. Elephants and whales have only one or two offspring at a time, and their populations grow very slowly. Mice and frogs, on the other hand, have numerous offspring at one time and experience exponential growth when environmental conditions such as food and water are favorable. Elephants and whales represent a type of life history called a K-strategy. Organisms that follow a K-strategy have only a few offspring, don’t reproduce until later in life, and tend to have long life spans. Mice and frogs, however, represent a different life history called an r-strategy. Organisms that follow an r-strategy tend to start reproducing at an early age and produce many offspring every time they reproduce. A pack of wolves, a parliament of owls, a colony of penguins—people have come up with many different ways of referring to groups of individuals. In ecology, a group of individuals of the same species is called a population. A population Opens in modal popup window is a group of the same species of individuals living in the same area and interacting with each other in some way. Populations of the same species may be separated by geography. For example, the penguins living in one area of Antarctica make up a different population from the penguins living in another area of Antarctica. Missing Metadata A population is a group of the same species of individuals living and interacting in the same area. Seen from outer space, earth looks like a swirly blue marble. On that blue marble are living things, from the bottom of the oceans to the top of the highest mountains. That zone of life is like a shell that contains all organisms. Scientists call that zone the biosphere. In this lesson, you will learn about how the biosphere is organized and how the environment affects the organisms within it. The smaller the population, the more vulnerable it is to demographic stochasticity, environmental stochasticity, and reduced genetic diversity. These factors, often working in concert, tend to further reduce population size and drive the species toward extinction. This trend is known as the extinction vortex. See the box on the right for an example of an extinction vortex. The greatest loss with the longest-lasting effects from the ongoing destruction of wilderness will be the mass extinction of species that provide Earth with biodiversity. Although great extinctions have occurred in thepast, none has occurred as rapidly or has been so much the result of the actions of a single species. The extinction rate of today may be 1,000 to 10,000 times the biological normal, or background, extinction

the jeep colorful all over printed hawaiian shirt 1
the jeep colorful all over printed hawaiian shirt 1

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