Botany, Ecology, Phylogenetic tree, Evolutionary biology and Phylogenetics are his primary areas of study. His study in the fields of Pollen under the domain of Botany overlaps with other disciplines such as Coreopsis nuecensis. Monophyly and Hybrid speciation are the primary areas of interest in his Phylogenetic tree study.
His work carried out in the field of Hybrid speciation brings together such families of science as Chloroplast DNA, Chloroplast capture, Nucleic acid, Intergenic region and Reticulate evolution. Daniel J. Crawford has included themes like Internal transcribed spacer, Inuleae, Taxonomic rank, Nuclear gene and Systematics in his Evolutionary biology study. His studies link Disjunct distribution with Phylogenetics.
Daniel J. Crawford mostly deals with Botany, Ecology, Evolutionary biology, Genus and Taxon. The Botany study combines topics in areas such as Monophyly and Phylogenetic tree. In his study, which falls under the umbrella issue of Ecology, Genetic variation is strongly linked to Genetic diversity.
His studies deal with areas such as Allopatric speciation, Polyploid, Plant evolution, Tolpis and Phylogenetics as well as Evolutionary biology. His work on Subgenus as part of general Genus study is frequently connected to Flavonols, therefore bridging the gap between diverse disciplines of science and establishing a new relationship between them. His Taxon research is multidisciplinary, relying on both Plant ecology and Divergence.
Daniel J. Crawford focuses on Ecology, Archipelago, Genetic diversity, Tolpis and Genetic variation. His work in Ecology tackles topics such as Genetic divergence which are related to areas like Allopatric speciation. His work in Genetic diversity covers topics such as Zoology which are related to areas like Species complex.
His Tolpis study also includes fields such as
Daniel J. Crawford mainly focuses on Genetic diversity, Ecology, Genetic variation, Botany and Zoology. The concepts of his Genetic diversity study are interwoven with issues in Archipelago, Population genetics and Endemism. In the field of Ecology, his study on Hesperomannia, Dioecy and Commidendrum overlaps with subjects such as Christmas Island and Colonisation.
His Botany study frequently intersects with other fields, such as Paraphyly. The study incorporates disciplines such as Ecological speciation and Hybrid zone in addition to Zoology. His research in Wolffiella intersects with topics in Phylogenetics, Monophyly and Phylogenetic tree.
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Chloroplast DNA phylogeny, reticulate evolution, and biogeography of Paeonia (Paeoniaceae).
Tao Sang;Daniel J. Crawford;Tod F. Stuessy.
American Journal of Botany (1997)
Clonal diversity in the rare Calamagrostis porteri ssp. insperata (Poaceae): comparative results for allozymes and random amplified polymorphic DNA (RAPD) and intersimple sequence repeat (ISSR) markers
E. J. Esselman;L. Jianqiang;D. J. Crawford;J. L. Windus.
Molecular Ecology (1999)
Plant genetic diversity in the Canary Islands: a conservation perspective
Javier Francisco-Ortega;Arnoldo Santos-Guerra;Seung-Chul Kim;Daniel J. Crawford.
American Journal of Botany (2000)
Conservation of oceanic island floras: present and future global challenges.
Juli Caujapé-Castells;Alan Tye;Daniel J. Crawford;Arnoldo Santos-Guerra.
Perspectives in Plant Ecology Evolution and Systematics (2010)
Phylogeny and Systematics of Lemnaceae, the Duckweed Family
Donald H. Les;Daniel J. Crawford;Daniel J. Crawford;Elias Landolt;John D. Gabel.
Systematic Botany (2009)
Timing the Eastern Asian–Eastern North American Floristic Disjunction: Molecular Clock Corroborates Paleontological Estimates
Qiu-Yun Xiang;Douglas E. Soltis;Pamela S. Soltis;Steven R. Manchester.
Molecular Phylogenetics and Evolution (2000)
Enzyme Electrophoresis and Plant Systematics
Daniel J. Crawford.
Pleistocene refugium endemics exhibit greater allozymic diversity than widespread congeners in the genus Polygonella (Polygonaceae)
Paul O. Lewis;Daniel J. Crawford.
American Journal of Botany (1995)
Radiation of the endemic genus Dendroseris (Asteraceae) on the Juan Fernandez Islands: evidence from sequences of the its regions of nuclear ribosomal DNA
Tao Sang;Daniel J. Crawford;Sueng-Chul Kim;Tod F. Stuessy.
American Journal of Botany (1994)
Breeding System and pollination of selected plants endemic to Juan Fernandez Islands.
Gregory J. Anderson;Gabriel Bernardello;Tod F. Stuessy;Daniel J. Crawford.
American Journal of Botany (2001)
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