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Topic: Cladogenesis


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  Cladogenesis
Cladogenesis defines those cases of evolution in which one species develops into two or more through adaptation.
Cladogenesis explains the development of a large assortment of species from a smaller set of ancestral species through evolution.
Cladogenesis is probably a more common form of evolution and speciation than anagenesis.
www.iscid.org /encyclopedia/Cladogenesis   (217 words)

  
 [No title]
Genetic variance may be lost from a population through genetic drift, however in a metapopulation of several local populations with minimal gene flow between them, erosion of genetic variance by genetic drift occurs at a slower rate in the metapopulation as a whole than in a panmictic population of same size.
Cladogenesis of a local population is also contingent on long persistence time of the local population.
Cladogenesis of a local population may also occur in sympatry or in parapatry.
ib.berkeley.edu /courses/ib160/past_papers/vidigal-jones.html   (3098 words)

  
 Cladogenesis   (Site not responding. Last check: 2007-09-21)
Cladogenesis, or branching evolution, is the budding of a new species from a parent species that continues to exist.
Unlike Anagenesis, Cladogenesis promotes biological diversity by increasing the number of species.
Although it culminates over thousands or millions of years, cladogenesis is a real event: new species are created by cladogeneis, which is ultimately respoinsible for the origin of every major group of animals.
www.uic.edu /classes/bios/bios101/Speciation2/tsld007.htm   (64 words)

  
 More Info on Fossil Formation   (Site not responding. Last check: 2007-09-21)
The fossil records not only indicate a catalog of species that have become extinct but also reveal the extent to which major groups are related to each other through homologies of common ancestry.
In this process the origin of a new species is the direct result of the isolation of small populations from ancestral stocks.
Taken collectively and supported by the fossil remains, phyletic change and cladogenesis can result in adaptive radiation or evolution from a common ancestry to a number of different forms, each specialized to fill a different habitat and ecological niche.
dev.nsta.org /ssc/moreinfo.asp?id=907   (632 words)

  
 Meet Brother Gregory   (Site not responding. Last check: 2007-09-21)
It was these sudden moments of cladogenesis, when a speciation event takes place, that Darwin and Mendel did not understand, and could therefore not take into account when drawing up their family trees.
The exact relation of anagenesis to cladogenesis (are they related events and processes or are they independent of one another?), continues to be one of the unresolved issues facing evolutionary scientists today.
The word phylogenesis is used to summarize the combined processes of anagenesis and cladogenesis, and the examination of phylogenesis is often called phylogenetics.
www.brooklyn.cuny.edu /bc/ahp/MBG/MBG2/Phylogeny.html   (498 words)

  
 [No title]   (Site not responding. Last check: 2007-09-21)
Of the others, 17% appear to arise by anagenesis, so just 30% might be products of bifurcative, Hennigian cladogenesis: the pseudoextinction of an ancestor as it evolves into two or more desendants.
The results suggest that a large majority of mammalian species arise by peripheral isolates speciation, going on to live side-by-side with "sister" species that are morphologically identical to ancestors.
However, standard cladistic methods assume instead that all cladogenesis is by Hennigian bifurcation, so these methods should not be applied to paleontological morphospecies.
www.nceas.ucsb.edu /~alroy/abstracts/gsa99.ftp   (276 words)

  
 UCMP Glossary: Phylogenetics
cladogenesis -- The development of a new clade; the splitting of a single lineage into two distinct lineages; speciation.
radiation -- Event of rapid cladogenesis, believed to occur under conditions where a new feature permits a lineage to move into a new niche or new habitat, and is then called an adaptive radiation.
They are often difficult to recognize because they may not possess synapomorpies found in the crown group.
www.ucmp.berkeley.edu /glossary/gloss1phylo.html   (1380 words)

  
 ENSI/SENSI Papers & Articles: The De-riving Force of Cladogenesis
Cladogenesis is the term used to describe the branching off of new taxa.
These branches - or clades -are based on several criteria which make the descendants along a particular branch different from their ancestors and from related taxa on other branches.
*This explanation of cladogenesis, cladistics and cladograms was first published in the Reports of the National Center for Science Education, May/June 1999, Vol.
www.indiana.edu /~ensiweb/cladogen.html   (590 words)

  
 [No title]
Anagenesis is the accumulation of changes associated with the transformation of one species into another.
Cladogenesis, branching evolution, is the budding of one or more new species from a parent species.
Cladogenesis promotes biological diversity by increasing the number of species.
www.4j.lane.edu /~sanderson/Documents/Ch24WordLectureOutline.doc   (4502 words)

  
 How we look at the Relationships of Taxa
A PHYLOGENY is the actual history of cladogenesis in a clade.
This is the point at which the cohesiveness within a lineage (usually maintained through interbreeding) is broken and a branch takes on a new evolutionary direction independant of its previous connection with another species in the clade.
This can be as big as the movement of two continents splitting one species into two, or as subtle as a mutation occuring within an individual that prevents it from breeding but still allows it (or even helps it) to reproduce asexually (e.g.
www.virtualherbarium.org /teach/plantsys/plslec2.html   (869 words)

  
 Speciation
One mechanism for the phenomenon of cladogenesis is allopatric speciation:
It has not generally been considered to be an important mechanism of cladogenesis, but there are some situations where it must acount for rapid speciation without geographical barriers;
Pre-mating barriers must arise first, and be very effective at preventing gene flow if cladogenesis is to take place.
www.users.csbsju.edu /~wlambert/bio115/topics/5.1speciation.html   (294 words)

  
 Cladogenesis - EvoWiki   (Site not responding. Last check: 2007-09-21)
Cladogenesis is the branching or divergence component of macroevolutionary change.
You can help the EvoWiki by expanding it into a full article.
This page was last modified 12:49, 27 June 2005.
wiki.cotch.net /index.php?title=Cladogenesis&redirect=no   (43 words)

  
 Dr Jon Waters
Burridge, C.P., Craw, D. and Waters, J.M. River capture, range expansion, and cladogenesis: the genetic signature of freshwater vicariance.
Waters, J.M., Allibone, R.M. and Wallis, G.P. Geological subsidence, river capture, and cladogenesis of galaxiid fish lineages in central New Zealand.
Waters, J.M. and Wallis, G.P. Cladogenesis and loss of the marine life history phase in freshwater galaxiid fishes (Osmeriformes: Galaxiidae).
www.zoology.otago.ac.nz /pubs/waters/jw.html   (849 words)

  
 Algal switching among lichen symbioses -- Piercey-Normore and DePriest 88 (8): 1490 -- American Journal of Botany
of the hypotheses of parallel cladogenesis and cospeciation
Partners from the same lichen association are connected by lines between the phylograms; their crossing shows no overall parallel cladogenesis.
Examples of phylogenetic cospeciation, common to all TreeMap reconstructions as described in Table 2, are indicated on both trees with green dots marked A and B, and their partners are connected by green lines.
www.amjbot.org /cgi/content/full/88/8/1490   (4036 words)

  
 1306 Speciation
Fossils suggest two patterns of speciation: anagenesis and cladogenesis.
Anagenesis: one species transforms into another species; does not contribute to biological diversity.
Cladogenesis (clado=branch): New species arise from a parent species which remains in existence.
www3.baylor.edu /~Mark_Taylor/1306Speciation.htm   (1017 words)

  
 The Origin of Species
species into more than one descendant species; cladogenesis is a type of
Cladogenesis does not (or, at least, does not necessarily) involve the extinction of the parental species
For whatever it is worth, anagenesis is probably just a special case of cladogenesis where the parental population either
www.mansfield.ohio-state.edu /~sabedon/campbl24.htm   (1503 words)

  
 The Clovis First/ Pre-Clovis Problem: 2004 Revisit
Cladogenesis is "the branching and diversification of lineages during evolution.
Yes, I am aware that anagenesis and cladogenesis are biological concepts and projectiles do not breed.
Still, in this webpage I have chosen to apply these concepts to projectile type change through time.
www.ele.net /art_folsom/pre-clovis_2004/preclovis2004.htm   (2833 words)

  
 Punctuated Equilibria
In this manner, it can be made clear what PE means for the concept of paleospecies.
First, modern species appear to have derived from cladogenesis, the splitting of a daughter species from an ancestral species rather than transformation of the ancestral species in toto.
This is a multiplication of species, and without it, the diversity of the living systems that we see would be impossible.
www.talkorigins.org /faqs/punc-eq.html   (3019 words)

  
 Free Term Papers on biology
For this to occur, the ancestral species must die off, or become extinct.
Cladogenesis also involves the transformation of a single ancestral species.
However is Cladogenesis, the ancestral species is transformed into more than one descendant species, or multiple lineages.
www.freefortermpapers.com /show_essay/7689.html   (134 words)

  
 Evolution at NYU--Systematics
CLADOGENESIS: branching (divergence) by speciation (may be confused by "reticulate evolution"; e.g., by hybridization or other "horizontal transfer")
HOMOLOGOUS: the "same" character in different organisms (shared because of common ancestry); the important characters for inferring the history of cladogenesis!
Only APOMORPHIC changes are informative about the history of cladogenesis and thus for classification
www.nyu.edu /projects/fitch/courses/evolution/html/systematics.html   (1527 words)

  
 CV of Olga Zhaxybayeva
O. Zhaxybayeva and J. Peter Gogarten: Cladogenesis, Coalescence and the Evolution of the Three Domains of Life.
Olga Zhaxybayeva and J. Peter Gogarten: "Cladogenesis, Coalescence and the Evolution of the Three Domains of Life", Astrobiology, 4(2), 2004.
"Cladogenesis, Coalescence and the Evolution of the Three Domains of Life", Invited seminar at 1st Astrobiology Graduate Conference (ABGradCon2004), Tucson, AZ, January 7-10, 2004
carrot.mcb.uconn.edu /~olgazh/cv.html   (3030 words)

  
 Find in a Library: Phylogeny, ecology, and the nature of cladogenesis in Australian pygopopid lizards
Find in a Library: Phylogeny, ecology, and the nature of cladogenesis in Australian pygopopid lizards
Phylogeny, ecology, and the nature of cladogenesis in Australian pygopopid lizards
WorldCat is provided by OCLC Online Computer Library Center, Inc. on behalf of its member libraries.
worldcatlibraries.org /wcpa/ow/0b74d0cb1237450aa19afeb4da09e526.html   (64 words)

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