D. Crawford

Publications303
h-index50
Citations10,302
Highly Influential Citations590
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Plant genetic diversity in the Canary Islands: a conservation perspective.
TLDR
A review of allozyme variation in 69 endemic species belonging to 18 genera and eight families indicates that the most effective strategy for preserving genetic variation in species is to conserve as many populations as possible.
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Timing the eastern Asian-eastern North American floristic disjunction: molecular clock corroborates paleontological estimates.
TLDR
The results suggest that the isolation of most morphologically similar disjunct species in eastern Asia and eastern North America occurred during the global climatic cooling period that took place throughout the late Tertiary and Quaternary.
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Documentation of reticulate evolution in peonies (Paeonia) using internal transcribed spacer sequences of nuclear ribosomal DNA: implications for biogeography and concerted evolution.
TLDR
Reconstruction of reticulate evolution with sequence data provides gene records for distributional histories of some of the parental species and demonstrates that the sequence data could be highly informative and accurate for detecting hybridization.
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Phylogenetic and Systematic Inferences from Electrophoretic Studies
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Enzyme Electrophoresis and Plant Systematics
TLDR
The present treatment updates previous reviews and discusses the use of enzyme electrophoresis for addressing questions in plant systematics in light of the increasing emphasis on comparative studies of DNA.
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Radiation of the endemic genus Dendroseris (Asteraceae) on the Juan Fernandez Islands: evidence from sequences of the its regions of nuclear ribosomal DNA
TLDR
Phylogenetic relationships among nine of the 11 species of the endemic genus Dendroseris on the Juan Fernandez Islands were inferred from nucleotide sequences of the internal transcribed spacer regions (ITS) of the 1 8-26S nuclear ribosomal DNA, supporting the hypothesis of rapid adaptive radiation of DENDroser is on the islands.
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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)…
Four populations of the rare, highly clonal grass Calamagrostis porteri ssp. insperata were examined using allozymes and the two polymerase chain reaction (PCR)‐based markers, random amplified…
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ITS Sequences and the Phylogeny of the Genus Robinsonia (Asteraceae)
TLDR
ITS sequences provide strong support for the monophyly of Robinsonia, and relative rate tests indicate that the molecular clock cannot be rejected for ITS sequence evolution in Robinsonia.
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A common origin for woody Sonchus and five related genera in the Macaronesian islands: molecular evidence for extensive radiation.
TLDR
Increase of woodiness is concordant with other insular endemics and refutes the relictural nature of woody Sonchus in the Macaronesian islands and indicates that the alliance probably occurred in the Canary Islands during the late Miocene or early Pliocene.
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Allozyme diversity in endemic flowering plant species of the Juan Fernandez Archipelago, Chile: ecological and historical factors with implications for conservation.
TLDR
High mean G(ST) values for the species examined illustrate the need for conserving as many populations as possible, either in the wild or in the garden, to preserve maximal diversity within species.
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