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Topic: Species diversity

Related Topics

Ecosystem diversity

Genetic diversity

Biological diversity

Biodiversity

Extinction

Agrobiodiversity

Species

International Treaty on Plant Genetic Resources for Food and Agriculture

Convention on Biological Diversity

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	:: Centre for Marine Biodiversity ::
		Genetic diversity is the variation in the amount of genetic information within and among individuals of a population, a species, an assemblage, or a community.
		Species diversity is the variation in the number and frequency of species in a biological assemblage or community.
		Species diversity is the most commonly used synonym for biodiversity, where species richness (number of species in a given habitat) is the main index used for its measurement.
	www.marinebiodiversity.ca /en/what.html (999 words)

	UNEP-Caribbean Environment Programme_Biodiversity (Site not responding. Last check: 2007-10-12)
		Species diversity is the middle level in the hierarchy of biological diversity.
		Species diversity is often equated with biological diversity, although this is not the case.
		Species diversity refers to the variety of species in a certain region, and varies greatly among taxonomic groups and among geographic areas.
	www.cep.unep.org /issues/biodiversity.html (7407 words)

	9(h) Species Diversity and Biodiversity
		These species are often difficult to find and identify because of their small size and the fact that they live in habitats that are difficult to explore.
		The continued extinction of species on this planet by human activities is one of the greatest environmental problems facing humankind.
		Species Level or Species Diversity - Species diversity is the number of different species of living things living in an area.
	www.physicalgeography.net /fundamentals/9h.html (758 words)

	World Conservation Monitoring Centre - Biodiversity - An Overview
		Species are also the primary focus of evolutionary mechanisms, and the origination and extinction of species are the principal agents in governing biological diversity in most senses in which the latter can be defined.
		The reasons for the large-scale geographic variation in species diversity, and in particular for the very high species diversity of tropical moist forests, are not fully understood and involve two interconnected questions: the origin of diversity through the evolution of species and the maintenance of diversity.
		Diversity is important only to the extent that it contributes to the system functioning as a carbon sink and the argument applies equally to other systems with a similarly high capacity for carbon fixation, such as tropical freshwater swamps, although these are far less diverse than tropical moist forest.
	www.life.uiuc.edu /bio100/lectures/s97lects/20Biodiversity/WCM.html (4904 words)

	Diversity by Design
		Spatial species diversity may be exceedingly narrow (e.g., a monocropped rice field) or exceedingly broad (e.g., a home garden featuring simultaneous cultivation of fruit trees, banana plants, coffee, spices, and several food crops).
		Temporal species diversity may be narrow (e.g., one maize monocrop crop per year, every year); broad within a year (e.g., an annual sequence of multiple cropping involving cereals, legumes, and horticultural crops); or broad over several years (e.g., rice-potato-wheat patterns, broken every few years by a sugarcane crop).
		System diversity may be broadened by increasing crop genetic diversity, expanding crop species diversity over space and time, fostering crop-livestock interactions, or improving productivity in favored agricultural areas to protect biologically diverse fragile, marginal, or forested areas from agriculture.
	www.worldbank.org /html/cgiar/newsletter/june97/9divers.html (1798 words)

	Nature Works -Species Diversity (Site not responding. Last check: 2007-10-12)
		Species diversity is the variety of life forms found on earth.
		Diversity of Life - There are millions of known and unknown species.
		Classifying Life - All the species of organisms on earth fall into one of five categories or kingdoms.
	www.nhptv.org /natureworks/nwep13.htm (216 words)

	Species (Site not responding. Last check: 2007-10-12)
		Species diversity can be expressed in terms of richness, that is the number of species in an area – for example you can count the number of plant species in your garden which will give you the species richness of your garden.
		Diversity indices are of more value to ecologists, since they give an idea of the composition of the communities existing in an area, and help identify species that dominate the community in terms of their abundance, biomass or cover.
		A striking pattern is the increase in diversity from the poles to the equator, thus while the tropical areas team with life, temperate areas which are closer to the poles have fewer kinds of plants and animals, while the polar regions are stark and barren.
	edugreen.teri.res.in /explore/life/species.htm (997 words)

	Some implications of direct interactions for community species diversity Ecology - Find Articles
		Species diversity is much more than a quantitative descriptor of the number of species present in a particular community.
		Species interactions affect local species diversity and species diversity alters the nature of interactions.
		For descriptive ease, we refer to those species that have direct positive effects on other species as "facilitators." This terminology is used in the same context as "competitors," "predators," or "omnivores," i.e., those species that have direct negative effects on other species.
	www.findarticles.com /p/articles/mi_m2120/is_n7_v78/ai_20417922 (988 words)

	Urban Habitats -- Patterns of Species Diversity in Eight Northeastern United States Cities
		One aspect of species richness that is particularly relevant in urban areas is the occurrence of nonnative species.
		A total of 316 (11.6%) native species are found in all eight urban areas, and 109 (7.5%) nonnative species are found in all eight urban areas; overall, 425 species (10%) are found in common.
		Nonnative species diversity is more complicated and appears to be significantly influenced by factors regarding the settlement of the city (e.g., date of settlement, presence of a seaport).
	www.urbanhabitats.org /v01n01/speciesdiversity_full.html (3019 words)

	Diversity - The Spice of Life
		Persons interested in wildlife and wildlife management need to be aware of the importance of diversity to many wildlife species and be able to recognize it (or the lack thereof) when they see it.
		Diverse plant communities increase the likelihood that some of the plants that serve as required food and cover species for a particular wildlife species are present.
		An abundance of well-distributed habitat types with a lot of vegetative diversity improves the chances that all of the habitat requirements for a particular species are met.
	www.noble.org /Ag/Wildlife/Diversity/PrintLayout_1_8049_8049.html (570 words)

	Earth Floor: Diversity
		Nearly one and a half million different species* of living things are known, and millions more are yet to be discovered in the depths of Earth's oceans and forests.
		Species diversity describes the number of different species in a region or in the world.
		The mold growing on your bread, the trees growing on your street, the insects buzzing about in your room, the pets sleeping by your bed, and you, yourself, are all members of a single type of life that descended from the same source.
	www.cotf.edu /ete/modules/msese/earthsysflr/diversity.html (322 words)

	Diversity of life (Box 1)
		Until recently, measurements of genetic diversity were applied mainly to domesticated species and populations held in zoos or botanic gardens, but increasingly the techniques are being applied to wild species.
		Thus, even though there may be more species of beetles on earth than all other species combined, they do not account for the greater part of species diversity because they are so closely related.
		Similarly, many more species live on land than in the sea, but terrestrial species are more closely related to each other than ocean species are, so diversity is higher in marine ecosystems than a strict count of species would suggest.
	pubs.wri.org /pubs_content_text.cfm?ContentID=1680 (683 words)

	Biodiversity - Wikipedia, the free encyclopedia
		For geneticists, biodiversity is the diversity of genes and organisms.
		Beta diversity is species diversity between ecosystems; this involves comparing the number of taxa that are unique to each of the ecosystems.
		When exotic species are introduced to ecosystems and establish self-sustaining populations, the endemic species in that ecosystem, that have not evolved to cope with the exotic species, may not survive.
	en.wikipedia.org /wiki/Biodiversity (3594 words)

	Diversity Index
		The term diversity is usually synonymous with "variety" and is simply an indication of the number of different thing present.
		For example, we often speak of a "diversity of opinions." While simply counting the number of different types of opinions on a subject can give a rough idea of the "diversity of opinions," the numbers of people holding the various opinions must be taken into account to get a true sense of the diversity.
		In short, what this indicates is that the diversity of pond 1 is much higher than pond 2 even though both have the same number of species and individuals.
	math.hws.edu /javamath/ryan/DiversityTest.html (608 words)

	Surprising species diversity revealed
		Likewise, the 652 species of fish listed in the register include those found on the slope and the southern part of Georges Bank, which has many southern species not found in the rest of the Gulf of Maine.
		Incze said the tiny species are an example of why the register is important: it can help scientists decide which species may be important to study further because of their impact on the whole ecological system.
		Species that are particularly understudied are viruses and bacteria, which typically are found in secondary sources, such as when they infect another species.
	www.gulfofmaine.org /times/spring2006/species2.html (1151 words)

	Investigate Biodiversity
		The term biodiversity is short for “biological diversity.” It’s the astounding variety of life on Earth—the plants, animals, habitats, and human cultures that populate the planet.
		Genetic diversity can be seen in the various colors and shapes of apples in the grocery store, the differences in human hair and eye color, and in the subtle changes in song or markings within a particular species of bird.
		Maintaining genetic diversity within a group of plants, animals, or people is extremely important because it allows populations to adapt when changes occur in their environment.
	www.fieldmuseum.org /biodiversity/investigate_basics1.html (618 words)

	Species richness - Wikipedia, the free encyclopedia
		Species richness is the simplest measure of biodiversity and is simply a count of the number of different species in a given area.
		Species richness has been found to be a good surrogate for other measures of biodiversity that would be more difficult to be measured directly as species richness is positively correlated with some measures.
		As a measure of biodiversity, species richness suffers from the lack of a good definition of "species." There are at least 7 definitions, with their own strength and weakness.
	en.wikipedia.org /wiki/Species_diversity (803 words)

	On Bjorn Lomborg and species diversity \| By Norman Myers \| Grist \| Arts and Minds \| 12 Dec 2001
		More important, as concerns the myriad benefits of safeguarding the planetary spectrum of species, Lomborg appears indifferent to what may be the most important benefit of all: the "ecosystem resilience" stemming from the abundance and variety of species.
		Lomborg goes on to speak of "the largest tropical study of the correlation between rain forest and the extinction of species," viz.
		Note the vital word "recorded." As Lomborg has earlier indicated, the vast majority of species are still unknown to science, hence their existence/extinction status is likewise unknown -- except that there is extensive evidence that many species that once existed are now gone.
	www.grist.org /advice/books/2001/12/12/specious (1365 words)

	[No title] (Site not responding. Last check: 2007-10-12)
		And they have suggested a mode of speciation (competitive speciation) that joins ecology and evolution, and appears to be implicated in biotic revolutions, the sort that sees major taxa such as dinosaurs supplanted by other major taxa such as mammals.
		Species diversity in ecological communities: historical and geographical perspectives.
		Species diversity and turnover in an Ordovician marine invertebrate assemblage, pp.
	eebweb.arizona.edu /faculty/mlro/diversity.html (693 words)

	Theory predicts the uneven distribution of genetic diversity within species
		We studied diversity of populations, how individuals in a population are different from each other and the degree to which they are different from each other.
		The importance of diversity: Biodiversity is important to survival of species in general.
		The main lesson from this study is that just as it is important to identify endangered species, it is important to identify the endangered individuals and groups that comprise a species.
	necsi.org /projects/evolecol/diversity1.html (530 words)

	The Epoch Times \| Study Shows Diversity is an Advantage
		Scientists are still to understand exactly what is responsible for the increased diversity selection but they are able to point out that none of the three processes they identified as being involved are seen to operate in forests where trees are all of a single species.
		The second is that rarer species may be at an advantage in the competition for certain physical resources, because individuals of the same species have more similar resource needs than individuals of different species.
		Thirdly, rare species are favoured when tree species have direct, positive influences on one another because a high proportion of trees that are different from them usually surround a tree of a rare species.
	www.theepochtimes.com /news/6-2-6/37840.html (815 words)

	Species Diversity (Site not responding. Last check: 2007-10-12)
		Accurate knowledge of the number and different types of species in a given community or ecosystem is the basis for understanding how a system functions, and thus how the removal or addition of species may alter that functioning.
		Knowing which species are present is requisite for understanding the ecological roles of the critical community members---what they eat, who eats them, and how they alter the community in which they live.
		Species diversity is sorely undersampled, underdescribed and, in some cases, is undergoing dramatic revision in the marine realm, as indicated in the examples given below.
	www.agu.org /revgeophys/butman01/node11.html (169 words)

	Tallapoosa - SPECIES DIVERSITY
		Because of the nature of the basins metamorphic and igneous rocks in the middle and upper reaches, the dissolved mineral content and resulting fertility of its waters are relatively low compared to the rest of the ACT (Alabama / Coosa / Tallapoosa) basin.
		Beisser (1990) developed an inventory of fish species in the vicinity of the proposed reservoir and identified 72 species inhabiting the drainage based on museum collections and literature citations, of which 46 were confirmed by electrofishing in 1989–1990.
		Of the eleven species of crayfish known to inhabit the Tallapoosa system, two are found nowhere else and are considered species of concern, Cambarus englishi and Orconectes holti.
	www.riversofalabama.org /Tallapoosa/TL_Species_Diversity.htm (973 words)

	ScienceDaily: New Study Explores Patterns In Species Diversity And Genetic Diversity
		For example, it has been shown that both species diversity and genetic diversity of forest plants remain at similarly low levels in secondary forests relative to primary forests, even when secondary forests are upwards of 100 years old.
		Diversity, Endemism, And Age Distributions In Macroevolutionary Sources And Sinks (April 18, 2005) -- Regions with high diversity or many unique species are often assumed to be hotbeds of species origination, but a new theory demonstrates that such places could instead result from the immigration of...
		Genetic Diversity Predicts Susceptibility To A Deadly Emerging Disease (April 21, 2005) -- Theory and molecular immunology predict that reduced genetic diversity increases susceptibility to new diseases.
	www.sciencedaily.com /releases/2005/07/050727060325.htm (1579 words)

	SPECIES DIVERSITY MARINE DIVERSITY
		"The Paradox of the Plankton": diversity in a homgeneious habitat
		Speciation and extinction rates: relative rates of extinction are lower, and speciation are higher in the tropics
		Taylor, R.H. and Regal, P.J. The peninsular effect on species diversity and the biogeography of Baja California.
	www.geo.arizona.edu /Antevs/ecol438/lect03.html (473 words)

	Australia's Biodiversity - Species Diversity
		Species diversity is the variety of species within a habitat or a region.
		Species are grouped together into families according to shared characteristics.
		In Australia, it is not just the individual species that are endemic - whole families of animals and plants are endemic.
	www.amonline.net.au /biodiversity/what/species.htm (204 words)

	Cofrin Center for Biodiversity
		Biodiversity is the variety or diversity of living organisms at all levels, the biological diversity of life.
		The basic components of biodiversity include a diversity of species, termed species diversity, as well as genetic diversity, taxonomic diversity, and ecological diversity (see table 1).
		This component of diversity includes the total number of species (species richness) as well as the distribution of individuals among species (species evenness).
	www.uwgb.edu /biodiversity/biota/biodiversity.htm (561 words)

	Speciation and Diversity
		In the last lecture we discussed the mechanics of microevolution and the evolution of species.
		Species diversity is a characteristic unique to the community level, i.e., a group of organism living together in a particular environment.
		We measure species diversity by both species richness (number of) and the distribution of individuals (eveness).
	www.utexas.edu /depts/grg/huebner/grg309/species.html (693 words)

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