K. Nixon

Publications114
h-index47
Citations13,045
Highly Influential Citations1,867
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TNT, a free program for phylogenetic analysis
TLDR
Through the use of a number of native commands and a simple but powerful scripting language, TNT allows the user an enormous flexibility in phylogenetic analyses or simulations. Expand
Angiosperm phylogeny inferred from 18S rDNA, rbcL, and atpB sequences
TLDR
A phylogenetic analysis of a combined data set for 560 angiosperms and seven outgroups based on three genes, 18S rDNA, rbcL, and atpB representing a total of 4733 bp is presented, resulting in the most highly resolved and strongly supported topology yet obtained for angiosPerms. Expand
The Parsimony Ratchet, a New Method for Rapid Parsimony Analysis
TLDR
With the ratchet, Goloboff's NONA, and existing computer hardware, data sets that were previously intractable or required months or years of analysis with PAUP* can now be adequately analyzed in a few hours or days. Expand
Populations, Genetic Variation, and the Delimitation of Phylogenetic Species
TLDR
Cl cladistic relationships as representative of phylogenetic relationships requires two conditions, both of which were identified by Hennig (1966, Phylogenetic systematics, Univ. Illinois Press, Urbana). Expand
Archaefructaceae, a New Basal Angiosperm Family
TLDR
Archaefructaceae is proposed as a new basal angiosperm family of herbaceous aquatic plants and is a sister clade to all angiosperms when their characters are included in a combined three-gene molecular and morphological analysis. Expand
Phylogeny, biogeography, and processes of molecular differentiation in Quercus subgenus Quercus (Fagaceae).
TLDR
The biogeographic hypothesis that all major oak lineages evolved locally at middle latitudes within the general distribution of their fossil ancestors was fully supported and a New World origin for the widespread white oaks of the Northern Hemisphere was suggested. Expand
ON SIMULTANEOUS ANALYSIS
Arguments for and against combined analysis of multiple data sets in phylogenetic inference are reviewed. Simultaneous analysis of combined data better maximizes cladistic parsimony than separate… Expand
Infrageneric classification of Quercus (Fagaceae) and typification of sectional names
HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and… Expand
ON SIMULTANEOUS ANALYSIS
TLDR
Arguments for and against combined analysis of multiple data sets in phylogenetic inference are reviewed and simultaneous analysis is to be preferred because it better maximizes cladistic parsimony than separate analyses. Expand
A Reevaluation of Seed Plant Phylogeny
TLDR
The results support the placement of the cycads as the sister group of a monophyletic group that includes several fossil «seed ferns» as well as extant Ginkgo, conifers, gnetopsids, and angiosperms. Expand
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