Results 291 to 300 of about 2,026,427 (351)

Rarefaction and Taxonomic Diversity

Biometrics, 1982
Rarefaction is a technique that corrects for unbalanced sample sizes, which are often a major problem in comparisons of diversity. The rarefaction curve is the expected number of higher taxonomic groups, such as families or genera, represented in a random selection of lower taxonomic units, such as species or individuals. The shapes of these curves are
John J. Gart, Andrew F. Siegel, Rebecca Z. German   +2 more
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Allergenic relationship between taxonomically diverse pollens

Clinical & Experimental Allergy, 1995
SummaryBackground Skin tests and tests for IgE antibodies show that subjects are usually sensitive to a number of different pollens, frequently from taxonomically diverse species which are assumed to be allergenically non‐crossreactive. This suggests that the presence of IgE antibody‐reactivity to an individual pollen may not necessarily have ...
N H, Pham, B A, Baldo
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Measuring beta‐diversity from taxonomic similarity

Journal of Vegetation Science, 2007
AbstractQuestion: The utility of beta (β‐) diversity measures that incorporate information about the degree of taxonomic (dis)similarity between species plots is becoming increasingly recognized. In this framework, the question for this study is: can we define an ecologically meaningful index of β‐diversity that, besides indicating simple species ...
Giovanni Bacaro, RICOTTA, Carlo, Stefano Mazzoleni   +2 more
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An Information-Theoretical Measure of Taxonomic Diversity

Acta Biotheoretica, 2003
Traditional diversity indices are computed from the abundances of species present and are insensitive to taxonomic differences between species. However, a community in which most species belong to the same genus is intuitively less diverse than another community with a similar number of species distributed more evenly between genera.
RICOTTA, Carlo, AVENA, Giancarlo
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Pathogens and other symbionts of the Amphipoda: taxonomic diversity and pathological significance.

Diseases of Aquatic Organisms, 2019
With over 10000 species of Amphipoda currently described, this order is one of the most diverse groups of freshwater and marine Crustacea. Members of this group are globally distributed, and many are keystone species and ecosystem engineers within their ...
J. Bojko, M. Ovcharenko
semanticscholar   +1 more source

Taxonomic Structure: Species Diversity

1984
Terrestrial ecologists long ago remarked on the richness of the floras and faunas of tropical environments relative to colder climates. The diversification within many specific taxonomic groups is clearly greater in the tropics than in temperate latitudes, both in terrestrial and in marine environments (Fig. 12–1).
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Taxonomic diversity estimation using rarefaction

Paleobiology, 1975
Benthic ecologists have successfully applied rarefaction techniques to the problem of compensating for the effect of sample size on apparent species diversity (= species richness). The same method can be used in studies of diversity at higher taxonomic levels (families and orders) in the fossil record where samples represent world-wide distributions of
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Geminiviruses: Taxonomic Structure and Diversity in Genomic Organization

Recent Patents on Biotechnology, 2020
Background: Geminiviridae is one of the best-characterized and hence, one of the largest plant-virus families with the highest economic importance. Its members characteristically have a circular ssDNA genome within the encapsidation of twinned quasi-icosaheadral virions (18-38 nm size-range).
Saurabh Kulshrestha, Abhishek Bhardwaj, null Vanshika   +2 more
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Average Taxonomic Diversity and Distinctness

2008
Taxonomic relatedness of the individuals or species in a sample is the key concept on which taxonomic diversity and distinctness measures of biodiversity are based. It is well known that in impacted assemblages of organisms the taxonomic spread of species is reduced, and in extreme cases they may be sibling species belonging to the same genus, or at ...
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Taxonomic, Phylogenetic, and Ecological Diversity of Methanogenic Archaea

Anaerobe, 2000
Methanogens are strict anaerobes which share a complex biochemistry for methane synthesis as part of their energy metabolism. The discovery of the unique biochemical and genetic properties of these organisms led to the concept of Archaebacteria at the end of the seventies and the proposal in 1990 for the domain Archaea.
Garcia, Jean-Louis, Patel, Bharat K.C., Ollivier, Bernard   +2 more
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