FACTOID # 51: Russia won the first World Air Games, held in Turkey in 1997. Events included hang-gliding, sky-surfing, and ballooning.
 
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Encyclopedia > Relative abundance

Natural abundance refers to the prevalence of different isotopes of an element as found in nature. The weighted (by natural abundance) average mass of these isotopes is the atomic weight listed for the element in the periodic table. The abundance of an element varies from planet to planet.


Percent natural abundances refer to the relative proportions, expressed as percentages by number, in which the isotopes of an element are found is natural sources.


  Results from FactBites:
 
Relative and absolute abundance of trilobites and rhynchonelliform brachiopods across the Lower/Middle Ordovician ... (884 words)
Because relative abundance is expressed as a proportion of the total sample, change in the abundance of one group necessarily changes the relative abundance of all groups in the sample.
There are two possible interpretations for a trend in the relative abundance of a taxon: an "active" scenario in which the trend reflects change in the population density of the group itself, or a "passive" scenario in which the change is driven by population changes in other taxa.
The relative abundance structure of an assemblage is, ideally, a probability distribution describing the likelihood that an individual randomly sampled from the assemblage will belong to the target group.
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