Biological Diversity biodiversity ecological diversity richness evenness richness

Biological Diversity = biodiversity ecological diversity = richness + evenness richness = number of different species evenness = number of individuals within each species biodiversity - variety of living organisms at all levels of biological organization Three primary levels of organization:

2. 1 Biological diversity includes genetic, species, and community/ecosystem diversity

-loss of biodiversity due to human population growth. Human population grows at about 50 -100 million (260, 000/day). A rapidly increasing human population and the growth of technology consumes greater amounts of natural resources. Is their any hope for solving this problem? as increased spectacularly since the

Reasons for optimism 1. Some countries have lowered population growth rates and others have had periods of negative growth. 2. Birth rates are high where family survival depends on being successful in an unskilled and uneducated labor pool that promotes large family size. This can be changed. 3. Wealthy countries consume a disproportionate share of global resources. Many tropical countries with high biodiversity are so poor that protecting native species is not a high priority. This can be changed. Key to these changes = Education and sustainable economic development can reduce population problems.

As these social changes occur, society must be concerned about biodiversity. Why? 1. Loss of biodiversity is occurring at an unprecedented level. As far as paleontologists can determine, never in the history of life have so many species been threatened with extinction in so short a period of time. Extinction is about 100 -1000 X faster than speciation. 2. What is bad for biodiversity is bad for humans.

Result of these concerns is Conservation Biology - science that uses an integrative approach to protection of biodiversity - uses principles of biology, natural resource management, and social sciences (anthropology, sociology, philosophy, and economics)

1. 1 Conservation biology and resource management

Box 1. 1 (Part 1) Brazilian scientists measure the length of an endangered green turtle Conservation Biology has 2 goals 1. investigate human impacts on species, communities, and ecosystems. 2. develop practical approaches to prevent the extinction of species and reintegrate them into properly functioning ecosystems

Origins of Conservation Biology 1. Non-European religion and customs - religion and philosophy rooted in relationships to natural world - Chinese Tao, Japanese Shinto, Hindu (killing of animal life is wrong) and Buddhist philosophies protect nature because of its capacity to produce spiritual experiences (meditation in natural areas, reverence for nature) - Native peoples had purification rituals in order to be considered worthy of hunting animals, gave names to, and told myths associated with plants, animals, and places

1. 4 Tanah Lot is a Hindu temple on the island of Bali in Indonesia

2. European Origins -human centered - God created nature for human’s use and benefit. -this view of nature led to exploitation and degradation of vast resources in the regions colonized by European countries -but made detailed observations of nature and began to see that conservation was needed. -noted the extinction of dodo on islands of Indian Ocean (1680) (80 years after human colonization) and loss of wild cattle (Bos primigenius or aurochs) (1627) -by the 1800 s, there had been many more extinctions and declines in population and several societies devoted to conservation were established (Commons, Open Spaces and Footpaths Preservation Society, National Trust, Royal Society for the Protection of Birds), however only 1% of land in Great Britain is in nature reserves

1. 5 Dodo went extinct in 1680 s and Poland formed nature reserve for European bison in 1561. European w

3. American Origins John Muir (1838 -1914) and the Preservation Ethic -influenced by three writers/philosophers 1. James Fenimore Cooper (1789 -1851) -considered to be the first true American novelist and his most popular work was The Last of the Mohicans -novels (The Pioneers, The Prairie, and The Deer Slayer) described the aesthetic values of wilderness 2. Ralph Waldo Emerson (1803 -1882) -essayist and poet -brought eastern philosophy to America and argued that nature was a temple for spiritual communion 3. Henry David Thoreau (1817 -1862) -writer and naturalist that built a cabin at Walden Pond on Emerson’s land -Walden and other works advocated a simpler life in tune with nature

Muir used ideas from these three writers to develop a preservation ethic which said that nature should be preserved on the grounds of human spiritual needs. -said nature had intrinsic value (value in and of itself apart from humanity). God created nature and destroying it was undoing God’s work. The beginning of the idea for the Judeo-Christian Stewardship Conservation Ethic -Muir's Preservation ethic is the one followed by the National Park Service today

Ellen Swallow Richards (1842 -1911) -developed first course at MIT in the new subject of Ecology -particularly concerned with water quality and helped pioneer water quality standards and sewage treatment

Gifford Pinchot (1865 -1946) and the Resource Conservation Ethic -proper use of natural resources is whatever furthers “the greatest good for the greatest number [of people] for the longest time” -first developed idea of sustainable development- development that best meets present and future human needs without damaging the environment and biodiversity -argued that government is needed to manage natural areas -philosophy mostly used by the Forest Service today

Aldo Leopold (1887 -1962) and the Evolutionary-Ecological Land Ethic -initially embraced Pinchot’s Conservation Ethic -later synthesized the ecological-evolutionary perspective (Muir) and sustainable development (Pinchot) into an evolutionary-ecological land ethic. -summed up in the following quote “A thing is right when it tends to preserve the integrity, stability, and beauty of the biotic community. It is wrong when it tends to do otherwise” -his philosophies combined with Pinchot’s resource conservation ethic provide the philosophical basis for ecosystem management used by federal government and some private entities to manage with prioritybeing the health of wild species and ecosystems

Box 9. 1 (Part 1) A captive peregrine feeding young at the Cornell University propagation facility Rachel Carson (1907 -1964) Marine Biologist -role of pesticides in decline of bird populations in Silent Spring (1962) -led to bans on DDT in many countries and recovery of numerous bird species including eagles, ospreys and falcons