Chapter 36 - Part VI Enhance E nh h your understanding of...

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Part VI Media Chapter 36 Population Ecology Animations Age Structure Diagrams R and K Strategies World Hunger Videos Exponential Growth Hungry Reindeer Booby Chick Competition Chapter 37 Behavioral Ecology Videos Wild Young Brains Bird Radar Cichlid Territoriality Voice of the Lobster Virtual Lab Mealworm Behavior Chapter 38 Community and Ecosystem Ecology Animation Water Cycle Videos Forest Blue Butterfl y Bat Prey Detection Ant Caterpillar Mutualism Decomposers Virtual Lab Population Biology Chapter 39 Major Ecosystems of the Biosphere Animations Biomes Deep Lake Layers Videos Thames River Coral Reef Ecosystems Virtual Lab Model Ecosystems Chapter 40 Conservation Biology Videos Global Warming Alien Invasion Karoo Global Warming Fishing for Trouble Ocean Fishing Ban Virtual Lab Tracking Grizzlies Enhance your understanding of ecology through media and applications! E nh t h r 724
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Applications Chapter 36 Population Ecology HOW LIFE CHANGES Adaptability of Small Populations 736 HOW SCIENCE PROGRESSES Sustainability of the U.S. Population 738 Chapter 37 Behavioral Ecology HOW LIFE CHANGES Sexual Selection 749 HOW SCIENCE PROGRESSES Do Animals Have Emotions? 754 Chapter 38 Community and Ecosystem Ecology HOW LIFE CHANGES Coevolution Between Parasite and Host 765 HOW SCIENCE PROGRESSES Preservation of Community Composition and Diversity 769 Chapter 39 Major Ecosystems of the Biosphere HOW LIFE CHANGES Land of Beringia 787 HOW SCIENCE PROGRESSES Hurricane Patterns in the United States 794 Chapter 40 Conservation Biology HOW LIFE CHANGES Response of Organisms to Global Climate Change 808 HOW BIOLOGY IMPACTS OUR LIVES Captive Breeding Programs 812 Organisms Live in Ecosystems 725
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Buck When a Population Grows Too Large W hite-tailed deer, which live from southern Canada to below the equator in South America, are prolific breeders. In one study, investigators found that two male and four female deer produced 160 offspring in six years. Theoretically, the number could have been 300 because a large proportion of does (female deer) breed their fi rst year, and once they start breed- ing, produce about two young each year of life. A century ago, the white-tailed deer population across the eastern United States was less than half a million. Today, it is well over 200 million deer—even more than existed when Euro- peans fi rst arrived to colonize America. This dramatic increase in population size can probably be attributed to a lack of preda- tors. For one thing, hunting is tightly controlled by government agencies, and in some areas, it is banned altogether because of the danger it poses to the general public. Similarly, the natural predators of deer, such as wolves and mountain lions, are now absent from most regions. This can be traced to a large human population that fears large predators because they could possibly attack humans and domestic animals.
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