H. Shaffer

Publications123
h-index52
Citations8,936
Highly Influential Citations642
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Annual review of ecology, evolution, and systematics
Twenty-four articles by biologists, ecologists, and other scientists represent a year's progress in the field. Among the topics addressed: the effects of introduced species, paleobiogeography,… Expand
Phylogenetic hypotheses for the turtle family Geoemydidae.
The turtle family Geoemydidae represents the largest, most diverse, and most poorly understood family of turtles. Little is known about this group, including intrafamilial systematics. The only… Expand
THE POLYTYPIC SPECIES REVISITED: GENETIC DIFFERENTIATION AND MOLECULAR PHYLOGENETICS OF THE TIGER SALAMANDER AMBYSTOMA TIGRINUM (AMPHIBIA: CAUDATA) COMPLEX
We present a phylogenetic analysis of the Ambystoma tigrinum complex, based on approximately 840 base pairs of mitochondrial‐DNA sequence from the rapidly evolving D‐loop and an adjacent intron. Our… Expand
Tests of turtle phylogeny: molecular, morphological, and paleontological approaches.
We present phylogenetic analyses of both molecular and morphological data for the 23 major lineages of living turtles and seven key fossil taxa. Nearly 1 kilobase of cytochrome b sequence, 325 base… Expand
Assessing Concordance of Fossil Calibration Points in Molecular Clock Studies: An Example Using Turtles
Although still controversial, estimation of divergence times using molecular data has emerged as a powerful tool to examine the tempo and mode of evolutionary change. Two primary obstacles in… Expand
Spatial Tests of the Pesticide Drift, Habitat Destruction, UV‐B, and Climate‐Change Hypotheses for California Amphibian Declines
Wind-borne pesticides have long been suggested as a cause of amphibian declines in areas without obvious habitat destruction. In California, the transport and deposition of pesticides from the… Expand
Molecular phylogenetics and evolution of turtles.
Turtles are one of Earth's most instantly recognizable life forms, distinguished for over 200 million years in the fossil record. Even so, key nodes in the phylogeny of turtles remain uncertain. To… Expand
Turtle phylogeny: insights from a novel nuclear intron.
Introns have gained considerable popularity as markers for molecular phylogenetics. However, no primers exist for a nuclear intron that amplifies across all turtles. Available data from morphology… Expand
Multiple data sets, high homoplasy, and the phylogeny of softshell turtles (Testudines: Trionychidae).
We present a phylogenetic hypothesis and novel, rank-free classification for all extant species of softshell turtles (Testudines:Trionychidae). Our data set included DNA sequence data from two… Expand
Troubleshooting Molecular Phylogenetic Analyses
▪ Abstract The number, size, and scope of phylogenetic analyses using molecular data has increased steadily in recent years. This has simultaneously led to a dramatic improvement in our understanding… Expand
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