A. J. Crawford

Publications81
h-index28
Citations3,314
Highly Influential Citations226
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Huge populations and old species of Costa Rican and Panamanian dirt frogs inferred from mitochondrial and nuclear gene sequences
TLDR
The results demonstrate that even a geologically young and dynamic region of the tropics can support very old lineages that harbour great levels of genetic diversity within populations, even within the same nominal species.
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Epidemic disease decimates amphibian abundance, species diversity, and evolutionary history in the highlands of central Panama
TLDR
A community-level assessment combining long-term field surveys and DNA barcode data describing changes in abundance and evolutionary diversity within the amphibian community of El Copé, Panama, following a disease epidemic and mass-mortality event is presented.
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Relative Rates of Nucleotide Substitution in Frogs
TLDR
A high Ks in mitochondrial vs. nuclear genes was unexpected in light of previous reports of a slow rate of mtDNA evolution in amphibians, highlighting the need for further investigation of the effects of life history on mutation rates.
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Towards complete and error-free genome assemblies of all vertebrate species
TLDR
The Vertebrate Genomes Project is embarked on, an effort to generate high-quality, complete reference genomes for all ~70,000 extant vertebrate species and help enable a new era of discovery across the life sciences.
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Molecular Studies and Phylogeography of Amazonian Tetrapods and their Relation to Geological and Climatic Models
TLDR
It is concluded that a high proportion of present-day diversity is a result of Neogene diversifi cation, refuting the long-held hypothesis that repeated expansion and contraction of lowland forests during Pleistocene climatic changes would be responsible for most of the Amazonian biodiversity.
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Cenozoic biogeography and evolution in direct-developing frogs of Central America (Leptodactylidae: Eleutherodactylus) as inferred from a phylogenetic analysis of nuclear and mitochondrial genes.
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Biogeography of the túngara frog, Physalaemus pustulosus: a molecular perspective
TLDR
Analysis of presumptive gene products of 14 allozyme loci and a portion of the mitochondrial COI gene from individuals sampled throughout the distribution revealed that western Panama populations represent a contact zone containing individuals with alleles from both groups present.
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The role of tropical dry forest as a long‐term barrier to dispersal: a comparative phylogeographical analysis of dry forest tolerant and intolerant frogs
TLDR
What appear to be minor differences in the natural history of these three closely related species may profoundly impact the potential for dispersal, range size, and cladogenesis, and it is suggested that the three lowland species are each other's closest relatives.
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Molecular phylogeny of an endemic radiation of Cuban toads (Bufonidae: Peltophryne) based on mitochondrial and nuclear genes
TLDR
A molecular phylogenetic and phylogeographical analysis of Peltophryne (Anura: Bufonidae) is presented to investigate the spatial and temporal origins of the genus, with particular focus on the eight Cuban species.
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Mitochondrial DNA phylogeography of Caiman crocodilus in Mesoamerica and South America.
TLDR
The molecular phylogenetic results identified five mtDNA haplotype clades with a mean sequence divergence of 3.4%, indicating considerable evolutionary independence among phylogeographic lineages, and confirm the status of C. c.
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