Methods for Computing Wagner Trees

1970 ◽  
Vol 19 (1) ◽  
pp. 83 ◽  
Author(s):  
James S. Farris
Keyword(s):  
Wagner Trees

Relationships in the Stringybarks, Eucalyptus L'hérit. Informal Subgenus Monocalyptus Series Capitellatae and Olsenianae: Phylogenetic Hypotheses, Biogeography and Classification

1986 ◽  
Vol 34 (6) ◽  
pp. 603 ◽  
Author(s):  
PY Ladiges ◽  
CJ Humphries
Keyword(s):  
Monophyletic Group ◽  
Sister Species ◽  
Historical Events ◽  
Seedling Morphology ◽  
Parsimony Method ◽  
Ancestral Area ◽  
Phylogenetic Hypotheses ◽  
Cladistic Biogeography ◽  
Wagner Trees ◽  
Disc Level

The stringybark eucalypts form a monophyletic group characterised in Monocalyptus by hispid juvenile leaves. They have been analysed using a phenetic method, additive similarity trees and a cladistic parsimony method (Wagner trees). The shortest Wagner trees indicated that Eucalyptus muelleriana is the sister species to all other stringybarks. E. olsenii and a taxon from the Carnarvon Range (Queensland) are the next most plesiomorphic taxa in the phyletic sequence. The remaining taxa form a trichotomy: E. tindaliae, species with fruits > 8 mm in diameter and with the disc ascending, and species with fruits < 8 mm and with the disc level. Subclades are largely characterised by seedling morphology. A revised informal classification is presented, the group being treated as a superseries. A method of cladistic biogeography is explained and applied. The stringybarks are endemic to eastern mainland Australia plus Kangaroo Island, but not Tasmania, and the consensus area-cladogram suggests a sequence of seven historical events subdividing an ancestral area into eight smaller ones. Queensland appears to be the most plesiomorphic area.

Recognition of Convergence and Parallelism on Wagner Trees

1978 ◽  
Vol 27 (1) ◽  
pp. 122
Author(s):  
Charles H. Nelson
Keyword(s):  
Wagner Trees

A QUICK METHOD FOR COMPUTING WAGNER TREES

Taxon ◽  
1972 ◽  
Vol 21 (1) ◽  
pp. 83-90 ◽  
Author(s):  
Trevor Whiffin ◽  
Mark W. Bierner
Keyword(s):  
Quick Method ◽  
Wagner Trees

Early Wagner trees and “the cladistic redux”

Cladistics ◽  
2012 ◽  
Vol 28 (5) ◽  
pp. 545-547 ◽  
Author(s):  
James S. Farris
Keyword(s):  
Wagner Trees

Wagner Trees in Theory & Practice

1983 ◽  
pp. 259-278 ◽  
Author(s):  
Donald H. Colless
Keyword(s):  
Wagner Trees

Implications of shallow tethys and the origin of modern oceans

1991 ◽  
Vol 4 (1) ◽  
pp. 37 ◽  
Author(s):  
KG McKenzie
Keyword(s):  
Infinite Number ◽  
Occam’S Razor ◽  
Wagner Trees ◽  
Occam's Razor

Cladograrns resemble directed Prim networks or Wagner trees, and are usually programmed by parsimony, i.e. the program searches for the least number of steps to achieve a cladistic synthesis. Large matrices can yield an almost infinite number of possible trees; and even when differences of only a few steps are involved there are numerous plausible solutions. Parsimony and other factors, such as Nelson and Platnick's assumptions, act as Occam's razor, reducing these to a manageable few.

Evaluation of the subtribes Moricandiinae, Savignyinae, Vellinae, and Zillinae (Brassicaceae, tribe Brassiceae) using chloroplast DNA restriction site variation

1994 ◽  
Vol 72 (11) ◽  
pp. 1692-1701 ◽  
Author(s):  
S. I. Warwick ◽  
L. D. Black
Keyword(s):  
Chloroplast Dna ◽  
Restriction Site ◽  
Restriction Site Variation ◽  
Site Variation ◽  
Dollo Parsimony ◽  
Subtribe Brassicinae ◽  
Dna Restriction ◽  
Cladistic Analyses ◽  
Almost All ◽  
Wagner Trees

Chloroplast DNA restriction site data was used to assess relationships among 21 taxa of the subtribes Moricandiinae, Savignyinae, Vellinae, and Zillinae (tribe Brassiceae, Brassicaceae). A total of 301 restriction site mutations was observed, with 154 (51.2%) phylogenetically informative. Cladistic analyses, based on Wagner and Dollo parsimony, indicated two major clades. One of these, the Vellinae–Zillinae clade, included members of the Vellinae and Zillinae, with a clarification of the positions of certain genera. The second, the Brassicinae : Rapa–Oleracea clade included Brassica rapa, Moricandia, Pseuderucaria, and Rytidocarpus. The position of Henophyton (Savignyinae) was not clearly resolved. Within the Vellinae–Zillinae clade, two main lineages were evident: (i) Vellinae-core clade, which includes Boleum, Carrichtera, and Vella (all members of the Vellinae) and Euzomodendron (Savignyinae); (ii) Zillinae clade, which includes Fortuynia, Physorrhynchus, Zilla (all Zillinae), and Foleyola and Schouwia (assigned to Moricandiinae and Vellinae, respectively). The positions of Psychine and Succowia (both assigned to Vellinae) were not clearly resolved in the strict consensus but were aligned with the Vellinae-core clade in almost all of the most-parsimonious Wagner trees. The cpDNA data did not support the current separate subtribal ranking for the Moricandiinae but instead revealed the genetic similarity of Moricandia, Pseuderucaria, and Rytidocarpus to subtribe Brassicinae. Key words: Brassicinae, Moricandiinae, Savignyinae, Vellinae, Zillinae, molecular systematics.

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