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Encyclopedia > Paleosubspecies

A chronospecies is a species which changes physically, morphologically, genetically, and/or behaviorally over time on an evolutionary scale such that the originating species and the species it becomes could not be classified as the same species had they existed at the same point in time. Throughout this change, there is only one species in the lineage living at any point in time, as opposed to cases where one species branches off into many through divergent evolution. In biology, a species is one of the basic units of biodiversity. ... Comparative anatomy is the study of similarities and differences in the anatomy of organisms. ... Genetics (from the Greek genno γεννώ= give birth) is the science of genes, heredity, and the variation of organisms. ... For the Pet Shop Boys album of the same name see Behaviour Behavior or behaviour (see spelling differences) refers to the actions or reactions of an object or organism, usually in relation to the environment. ... Divergent evolution occurs when a biological characteristic (such as a structure in two or more species or two or more genes) has a common evolutionary origin, but that characteristic has diverged over evolutionary time. ...


With a phyletic gradualism model of evolution, it can be difficult to separate chronospecies, since morphological changes accumulate over time and two very different organisms could be connected by a series of intermediaries. In practice, chronospecies are usually recognized because two species in the same lineage are named by palaeontologists without knowledge of any intermediate organisms. When organisms evolve by punctuated equilibrium, chronospecies can be readily seen in the fossil record when a lineage changes without splitting. Phyletic gradualism is a macroevolutionary hypothesis rooted in uniformitarianism. ... Paleontology or palaeontology (see Spelling differences) is the study of the history and development of life on Earth, including that of ancient plants and animals, based on the fossil record (evidence of their prehistoric existence as typically preserved in sedimentary rocks). ... Punctuated equilibrium (or punctuated equilibria) is a theory in evolutionary biology which states that most sexually reproducing species will show little to no evolutionary change throughout their history. ...


Prehistoric (but comparatively recent - usually Late Pleistocene) subspecies of extant taxa which evolved in a similar way as chronospecies are called pal(a)eosubspecies Most of those known have changed in size during adaptation to the climatic changes during the last ice age. Late Pleistocene (also known as Upper Pleistocene or the Tarantian) is a stage of the Pleistocene Epoch. ... In zoology, as in other branches of biology, subspecies is the rank immediately subordinate to a species. ... This article or section should be merged with Wisconsinan glaciation The Wisconsin (in North America), Weichsel (in Scandinavia), Devensian (in the British Isles) or Würm glaciation (in the Alps) is the most recent period of the Ice Age, and ended some 10,000 Before Present (BP). ...


Examples

Binomial name Coragyps atratus (Bechstein, 1793) A common New World vulture, the American Black Vulture, Coragyps atratus, tends to have a more southerly distribution than its compatriot, the Turkey Vulture, which breeds well into Canada. ... Binomial name Vultur gryphus Linnaeus, 1758 Conservation status: Lower risk (nt) Binomial name Gymnogyps californianus (Shaw, 1797) Conservation status: Critical Condor is the name for two species of bird in one of the vulture families. ...

References

  • Stanley, S. M. (1978) "Chronospecies' longevities, the origin of genera, and the punctuational model of evolution," Paleobiology, 4, 26-40.
  • Evolutionary species vs. chronospecies from Dr. Steven M. Carr, Memorial University of Newfoundland biology department
Speciation guide
v  d  e
Basic concepts: species | chronospecies | speciation | cline
Modes of speciation: allopatric | peripatric | parapatric | sympatric | polyploidy
Auxiliary mechanisms: sexual selection | assortative mating | punctuated equilibrium
Intermediate stages: hybrid | Haldane's rule | ring species
This evolution-related article is a stub. You can help Wikipedia by expanding it.

 
 
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