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Biodiversity
Definition: The diversity and variety of plants, animals and |
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"WHAT IS THE ORIGIN of biological diversity? This profoundly important problem can be most quickly solved by recognizing that evolution creates two patterns across time and space. Think of a butterfly species with blue wings as it evolves into another species with purple wings. Evolution has occurred but leaves only one kind of butterfly. Now think of another butterfly species, also with blue wings. In the course of its evolution it splits into three species, bearing purple, red, and yellow wings respectively. The two patterns of evolution which is vertical change plus the splitting of the original population into multiple races or species. The first blue butterfly experienced pure vertical change without speciation. The second blue butterfly experienced pure vertical change plus speciation. Speciation requires vertical evolution, but vertical evolution does not require speciation. The origin of most biological diversity, in a phrase, is a side product of evolution." |
"Even though Homo sapiens is destined for extinction, just like other species in
history, we have an ethical imperative to protect Nature's diversity, not destroy it."
- Richard E. Leaky in his book, The Sixth Extinction, p. 221
"In my opinion the most serious global ecological crisis is the escalating
diminishment of biodiversity and the fact that the Earth will lose more species of
plants and animals by 2050 then it has lost over the last sixty-five million years."
"The reason for saving plants and animals is not so they can be exploited for human use. All
natural things have intrinsic value, inherent worth. They have a right to exist for their own sake."
"To put it simply, we must protect as much critical habitat from humanity as is humanly possible as fast as possible.
It has recently been estimated that for about $28 billion, enough critical habitat could be bought or leased to protect
70 percent of the known plant and animal species in the world. In other words, for a fraction of the money our
government just spent in Iraq we could save the planet's biodiversity for future generations. Will we let this
opportunity slip away?"
"If late Paleolithic people in Australia, the Americas, and Eurasia reduced species diversity in the way the data suggest, then the dawn of human culture represents not only a profound behavioral or sociocultural transition. It also marks the transformation of humanity from a relatively rare and insignificant member of the large mammal fauna to a geologic force with the power to impoverish nature."
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The Pleistocene-Holocene Event: Forty Thousand Years of Extinction Dave Foreman in his book, Rewilding North America (A Vision for Conservation in the 21st Century), pp. 26-27 |
"During these forty millennia, human beings have wrought a slaughter in the diversity of life. Duke University's John Terborgh, who, along with Soulé,* was selected by Audubon magazine as one of the hundred greatest conservationists of the twentieth century, has looked at the loss of big animals in North America and concludes,"*Michael E. Soulé is a U.S. biologist, best known for his work in promoting the idea of conservation biology.'That we should live in a world without megafauna is an extreme aberration. It is a condtion that has not existed for the last 250 million years of evolutionary history."However, even a half-dozen species of large ungulates (hoofed, grazing, or browsing mammals, ranging in size from tiny antelope to elephants) is less than normal. I spent three weeks in southern Africa in 1998. Traveling through an area smaller than the eastern United States, I saw twenty-two species of ungulates out of a total number of forty-two. Eastern North America is truly an empty landscape."
To add perspective to the above, let us reflect on the fact that the entire eastern half of the North American continent south of the North Woods supports only one ungulate, the white-tailed deer . . . eastern North America is unique: all other continental mammal assemblages include a number of ungulates, frequently a half-dozen species or more.'"Even western North America has a pitifully small number of large mammals - there are only nine species of large native ungulates in the western United States and northern Mexico. It has only recently been so barren. Thirteen thousand years ago, what is now the western United States and northern Mexico hosted at least thirty-one species of large ungulates, including five species of mammoths and mastodons. While today this area has five species of large carnivores (if we count the very rare and largely absent grizzly bear, gray wolf, and jaguar), thirteen thousand years ago there were ten large carnivores spread across the landscape. By megafauna and large, paleontologists mean animals weighing 100 pounds (44 kg) or more."
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Miscellaneous Definitions: |
- Allelopathy - Root secretions that kill other plants.
- Angiosperms - Plants that flower and form fruits (ovary) with seeds (the Earth's most common plant form) - see Gymnosperms below.
- Anhydrobiosis - Life without water - is an adaptation common to many water-hole creatures.
- Biomimicry - Is (from www.BioMimicry.org):
- Is a new science that studies nature's models and then imitates or takes inspiration from these designs and processes to solve human problems, e.g., a solar cell inspired by a leaf.
- Uses an ecological standard to judge the "rightness" of our innovations. After 3.8 billion years of evolution, nature has learned: What works. What is appropriate. What lasts.
- Is a new way of viewing and valuing nature. It introduces an era based not on what we can extract from the natural world, but on what we can learn from it.
- Detritivore - An animal that feeds on animal and plant waste or remains, sequentially reducing the particle sizes so that the true decomposers, bacteria and fungi, can break them down to their constituent chemical parts for recycling in the ecosystem.
- Endophytes - "within plant," from the Greek, fungi and bacteria living inside of leaves and needles.
- Epiphytes - "air plants" that depend on trees or other plants for support, but not nutrients.
- Gymnosperms - Plants whose seeds are not enclosed by a ripened ovary (fruit) - see Angiosperms above. An example would be a typical pine cone.
- Lignin - comprises as much as one fourth of the volume of wood, acting like a cement holding the cellulose, pectin and related polysaccharides together (It is lignin that lends the vanilla odor to fresh sawdust).
- Precautionary Principle - In order to protect the environment, the precautionary approach shall be widely applied by States according to their capabilities. Where there are threats of serious or irreversible damage, lack of full scientific certainty shall not be used as a reason for postponing cost-effective measures to prevent environmental degradation. [Article 15 of the Rio declaration of 1992]
- Punctuated Equilibrium - a term developed by evoluntionary biologists to define nature's patterns of sudden pulses of speciation and extinction, followed by long periods of more subdued evolutionary activity.
- Rhizome - a lateral, underground root system, sending out above-ground shoots to forma vast network.
- Saprotrophs - fungi or bacteria that live on and help decay dead organic matter.
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