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Redirect|Systematic|the band|Systematic (band)for|related disciplines concerning classification of living things|biological classification|alpha taxonomy|taxonomyOther uses NOTOC ScienceBiological systematics is the study of the diversification of life forms, both past and present, and the Correlation and dependence|relationships among living things through time. Relationships are visualized as evolutionary trees (synonyms: cladograms , phylogenetic tree s, phylogenies). Phylogenies have two components, branching order (showing group relationships) and branch length (showing amount of evolution). Phylogenetic trees of species and higher taxa are used to study the evolution of traits (e.g., anatomical or molecular characteristics) and the distribution of organisms ( biogeography ). Systematics, in other words, is used to understand the evolutionary history of life on Earth.
"Systematic biology" and "taxonomy" (terms that are often confused and used interchangeably) were defined in relationship to one another as follows:Michener, Charles D., John O. Corliss, Richard S. Cowan, Peter H. Raven, Curtis W. Sabrosky, Donald S. Squires, and G. W. Wharton (1970). Systematics In Support of Biological Research . Division of Biology and Agriculture, National Research Council. Washington, D.C. 25 pp.
Systematic biology (hereafter called simply systematics) is the field that (a) provides scientific names for organisms, (b) describes them, (c) preserves collections of them, (d) provides classifications for the organisms, keys for their identification, and data on their distributions, (e) investigates their evolutionary histories, and (f) considers their environmental adaptations. This is a field with a long history that in recent years has experienced a notable renaissance, principally with respect to theoretical content. Part of the theoretical material has to do with evolutionary areas (topics e and f above), the rest relates especially to the problem of classification. Taxonomy is that part of Systematics concerned with topics (a) to (d) above.
The term "systematics" is sometimes used synonymously with " taxonomy " and may be confused with " scientific classification ". However, taxonomy, and in particular alpha taxonomy , is more specifically the identification, description, and naming (i.e. nomenclature) of organisms,Citation |last=Fortey |first=Richard |author-link=Richard Fortey |year=2008 |title=Dry Store Room No. 1: The Secret Life of the Natural History Museum |publication-place=London |publisher=Harper Perennial |isbn=978-0-00-720989-7 while "classification" is focused on placing organisms within hierarchical groups that show their relationships to other organisms. All of these biological disciplines can be involved with extinct and extant taxon|extant organisms. However, systematics alone deals specifically with relationships through time, and can be synonymous with phylogenetics, broadly dealing with the inferred hierarchy of organisms.
Systematics uses taxonomy as a primary tool in understanding organisms, as nothing about an organism's relationships with other living things can be understood without it first being properly studied and described in sufficient detail to identify and classify it correctly. Scientific classifications are aids in recording and reporting information to other scientists and to laymen. The systematist , a scientist who specializes in systematics, must, therefore, be able to use existing classification systems, or at least know them well enough to skillfully justify not using them.
Phenetic systematics was an attempt to determine the relationships of organisms through a measure of similarity, considering plesiomorph ies (ancestral traits) and apomorph ies (derived traits) to be equally informative. From the 20th century onwards, it was superseded by cladistics , which considers plesiomorphies to be uninformative for an attempt to resolve the phylogeny of Earth's various organisms through time. Today's systematists generally make extensive use of molecular biology and computer programs to study organisms.
Systematics is fundamental to biology because it is the foundation for all studies of organisms, by showing how any organism relates to other living things (ancestor-descendant relationships).
Systematics is also of major importance in understanding conservation issues because it attempts to explain the Earth's biodiversity and could be used to assist in allocating limited means to preserve and protect endangered species, by looking at, for example, the genetic diversity among various taxa of plants or animals and deciding how much of that to preserve.
See also
Cladistics - a popular methodology in systematics
Phenetics - an obsolete methodology, predecessor to cladistics
Phylogeny - what is analyzed in systematics and taxonomy
16S ribosomal RNA - the most intensively studied nucleic acid in phylogenetics
Phylogenetic comparative methods - use of evolutionary trees to study biodiversity and comparative biology
Scientific classification - the result of research in systematics and taxonomy
Taxonomy - a branch of the biological sciences related to systematics
References
Notes
Reflist
Further reading
Schuh, Randall T. and Andrew V. Z. Brower. 2009. Biological Systematics: Principles and Applications, 2nd edn. ISBN 978-0-8014-4799-0
Simpson, Michael G. 2005. Plant Systematics . ISBN 978-0-12-644460-5
External links
http://www.sasb.org.au/about-systematics/ Society of Australian Systematic Biologists
http://www.systematicbiology.org/ Society of Systematic Biologists
http://www.cladistics.org/The Willi Hennig Society
EvolutionBiology nav Category:Evolutionary biology Category:Scientific classification
