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Benjamin M. Fitzpatrick
Researcher at University of Tennessee
Publications - 74
Citations - 4787
Benjamin M. Fitzpatrick is an academic researcher from University of Tennessee. The author has contributed to research in topics: Population & Tiger salamander. The author has an hindex of 34, co-authored 71 publications receiving 4397 citations. Previous affiliations of Benjamin M. Fitzpatrick include National Institute for Mathematical and Biological Synthesis & University of California, Davis.
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Sympatric Speciation: Models and Empirical Evidence
TL;DR: It is now generally accepted that sympatric speciation has occurred in at least a few instances, and is theoretically plausible, and progress is being made on evaluating the empirical validity of key theoretical conditions for sympatrics speciation.
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Recent divergence with gene flow in Tennessee cave salamanders (Plethodontidae: Gyrinophilus) inferred from gene genealogies.
TL;DR: Results of coalescent‐based analysis of the distribution of haplotypes among groups reject the allopatric speciation model and support continuous or recurrent genetic exchange during divergence, strongly favour the hypothesis that Tennessee cave salamanders originated from spring salamander via divergence with gene flow.
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What, if anything, is sympatric speciation?
TL;DR: It is argued that testing whether a case fits a particular definition is less informative than evaluating the biological processes affecting divergence, and that this context can be better understood by modelling and measuring quantities, such as gene flow and selection, rather than assigning cases to discrete categories like sympatric and allopatric speciation.
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Rapid spread of invasive genes into a threatened native species
Benjamin M. Fitzpatrick,Jarrett R. Johnson,D. Kevin Kump,J. Joshua Smith,S. Randal Voss,H. Bradley Shaffer +5 more
TL;DR: Using computer simulations, it is found that the spread of a few introduced genes 90 km into a threatened native species in 60 years is unlikely to emerge by chance among selectively neutral markers, and implies that natural selection has favored both the movement and fixation of these exceptional invasive alleles.
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The geography of mammalian speciation: mixed signals from phylogenies and range maps.
TL;DR: The results support skepticism about ARC's power for inferring the biogeography of speciation and propose methodological improvements including changes in the way overlap between clades is quantified and Monte Carlo methods to test the null hypothesis of no relationship between phylogenetic relatedness and geographic range overlap.