By George Karleskint, Richard Turner, James Small
Immerse your self in creation TO MARINE BIOLOGY and quick research the content material of the path. whereas taking an ecological procedure, this biology textual content offers succinct insurance of the content material whereas the pictures and artwork in actual fact illustrates key suggestions. learning is made effortless with phonetic pronunciations, a operating word list of key words, end-of-chapter questions, and internet sites supplied on the finish of the bankruptcy, and lists of comparable articles came across during the textual content.
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The number of herbivores (plant-eating animals) that a given area can support is relative to the amount of vegetation that is available for food. The number of herbivores, in turn, supports a certain number of predators that use the herbivores as food. If the number of herbivores in an area increases so that there is not enough food for all of them, some will starve and the number of individuals will decline. As the number of individuals declines, the vegetation may be able to grow back, and as a result of more food, the population of herbivores may increase again.
Populations of sea urchins still thrive, however, in sewagepolluted areas where sea otters cannot survive and in some coastal areas of the North Pacific where killer whales feed on sea otters. Human intervention can also disrupt the delicate interactions between predators and their prey, as in southern California, where commercial harvest of sea urchins for food threatens the balance of this community once again by reducing the size of the sea urchin population on which sea otters depend. Symbiosis: Living Together Some organisms have developed very close relationships with each other, to the extent that one frequently depends on the other to survive.
Barnacles are sedentary animals, and the species that Connell worked with are relatively small and live in large, dense populations. Because of these characteristics, Connell could perform experiments that would have been impossible with larger, more mobile organisms. On one section of rocky shore, Connell observed the normal growth, reproduction, and daily activities of the two types of barnacles. This section of shore acted as the control for his experiment. On other sections he performed the following experiments.