| 海象（如封面所显示）的生存依赖于海洋浮水。它们在海洋浮冰上繁衍、生育和休息，以避免被鲸等捕食动物猎获。人类猎取象牙几乎使海象灭绝，后来，它们在太平洋北极地区恢复繁殖，目前那里生活着26万只海象。尽管土著人继续捕猎海象，但全球气候变化引起的海洋浮冰融化对海象生存的威胁更大。在今后的50年内，海象和北极熊生存需要的大部分冰块将面临融化。 |
| Mark B. Bush is an Associate Professor of conservation biology at the Florida Institute of Technology. His B.S. and Ph.D. degrees were earned at the University of Hull in England. Between undergraduate and graduate school, Bush spent several years working for the British Trust for Conservation Volunteers as a specialist in conservation education. . Professor Bush has spent more than 20 years in ecological research and has worked in some of t.. << 查看详细 |
| preface about the author part 1 biodiversity and the physical setting chapter 1 ecology and the power of natural selection chapter 2 chance,change and evolution chapter 3 the great wealth of life:biodiversity chapter 4 climate chapter 5 ecosystems,nutrient cycles,and soil part 2 population and community ecology chapter 6 the ecological efficiency of living things . chapter 7 who needs sex anyway? chapter 8 populations and resources:a balancing act chapter 9 the power of predators chapter 10 peopling earth part 3 community ecology chapter 11 biomes chapter 12 aquatic ecosystems chapter 13 why wetlands aren't worthless chapter 14 making connection:fisheries chapter 15 succession chapter 16 community change chapter 17 climate change and global warming chapter 18 fragmentation chapter 19 reserve deign part 4 ecology and society chapter 20 peeding the world chapter 21 pollution:the other face of fertilizers andpesticides chapter 22 atmosphere,air pollution,and ozone chapter 23 the use and supply of energy chapter 24 how does acid depostion affect ecosystems? chapter 25 human disease:evolutionary chapter 26 environmental economics chapter 27 environmental legislation and policy chapter 28 peering into the future glossary references photo credits index |
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