substituting species sample proportions into the diversity ..
Biological evolution, the process by which all living things have evolved over many generations from shared ancestors, explains both the unity and the diversity of species. The unity is illustrated by the similarities found betwen species; which can be explained by the inheritance of similar characteristics from related ancestors. The diversity of species is also consistent with common ancestry; it is explained by the branching and diversification of lineages as populations adapted, primarily through natural selection, to local circumstances.
Dominance hierarchies, diversity and species ..
Biodiversity is increased by the formation of new species (speciation) and decreased by the loss of species (extinction). Biological extinction, being irreversible, is a critical factor in reducing the planet’s natural capital.
The species diversity was positively
correlated with the abiotic factors such as high levels of light
meaning more plants to feed on, great amounts of oxygen and warmer
Shock! Navy investigating 2 SEALs for strangling death …
if its populations are living in different geographic areas) increases its potential for successfully evolving in response to long-term environmental changes. Today, this genetic diversity within species is declining precipitously over much of Earth’s land surface—an unheralded loss of one of humanity’s most vital resources. That resource is largely irreplaceable. Along with fossil fuels, rich soils, ancient groundwater, and mineral deposits, genetic diversity is part of the inheritance of capital that Homo sapiens is rapidly squandering.
Oct 29, 2017 · Shock
What then will happen if the current decimation of organic diversity continues? Crop yields will be more difficult to maintain in the face of climatic change, soil erosion, loss of dependable water supplies, decline of pollinators, and ever more serious assaults by pests. Conversion of productive land to wasteland will accelerate; deserts will continue their seemingly inexorable expansion. Air pollution will increase, and local climates will become harsher. Humanity will have to forego many of the direct economic benefits it might have withdrawn from Earth’s once well-stocked genetic library. It might, for example, miss out on a cure for cancer; but that will make little difference. As ecosystem services falter, mortality from respiratory and epidemic disease, natural disasters, and especially famine will lower life expectancies to the point where cancer (largely a disease of the elderly) will be unimportant. Humanity will bring upon itself consequences depressingly similar to those expected from a nuclear winter (Ehrlich, 1984). Barring a nuclear conflict, it appears that civilization will disappear some time before the end of the next century—not with a bang but a whimper.
Navy investigating 2 SEALs for ..
According to Lemons and Morgan (1995) study the biological diversity defines as “the variability among living organisms from all sources and ecological complex of which they are a part; this includes diversity within species, between species and of ecosystems’’....
Diversity and Change Management | Questions & …
Studies of plant species diversity in plantation ecosystems were reviewed. Planting is markedly different from other forest management systems as differences in the species planted (. ., exotic or native, evergreen or deciduous, conifer or broad-leaved) greatly affect plant species diversity in a stand or landscape. Stand develop- ment after planting promotes secondary succession, which involves invasion and regeneration by many species. While seed dispersal into a plantation by animals plays an important role in this process, the direction that the reorganization of the community takes is highly dependent on the degree of past disturbance, the distance from seed sources, stand age, and so on. There is large variation in the species diversity (including species richness and evenness) of plantations and other forest types. The species composition of plantations is usually much different from that of other forest types. Although many studies have examined timber production in plantations, little is known about the compromise between biodiversity conservation and timber production in plantations. Research on evaluating, conserving, and restoring species diversity and composition in plantations is required, with an investigation of the effects of plantations on plant-animal interactions, at both the stand and landscape levels.