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- Johnson, Jerald B., et al. Show all 3 Authors
- Diversity 2018 v.10 no.4
- Bayesian theory; Neotropics; Pleistocene epoch; coasts; freshwater fish; frogs; genetic variation; geographical distribution; glaciation; landscapes; models; nucleotide sequences; phylogeography; sea level; watersheds; Costa Rica; Panama
- ... Most Neotropical frog and freshwater fish species sampled to date show phylogeographic breaks along the Pacific coast of the Isthmus of Panama, with lineages in Costa Rica and western Panama isolated from central Panama. We examine temporal patterns of diversification of taxa across this ‘western Panama isthmus’ (WPI) break to test hypotheses about the origin of species geographical di ...
- Johnson, Jerald B., et al. Show all 2 Author
- Molecular ecology 2009 v.18 no.19 pp. 4088-4101
- DNA; Poecilia; community structure; cytochrome b; fish; fish communities; gene flow; genetic variation; haplotypes; monophyly; nucleotide sequences; phylogeography; population size; protein subunits; ribosomal proteins; Costa Rica
- ... One of the original goals of phylogeography was to use genetic data to identify historical events that might contribute to breaks among communities. In this study, we examine the phylogeography of a common livebearing fish (Poecilia gillii) from Costa Rica. Our goal was to determine if phylogeographical breaks in this species were congruent with previously defined boundaries among four fish commun ...
- JOHNSON, JERALD B.
- Biological journal of the Linnean Society 2001 v.72 no.4 pp. 519-527
- Poeciliidae; allozymes; cluster analysis; freshwater fish; genetic variation; geographical distribution; mitochondrial DNA; nucleotide sequences; Costa Rica
- ... I examined the geographic distribution of genetic variation in the livebearing freshwater fish Brachyrhaphis rhabdophora in northwestern Costa Rica as revealed by allozymes and mitochondrial DNA sequences. Allelic variability at 11 enzyme-coding loci surveyed across 12 localities revealed marked genetic differentiation among populations within drainages (0P= 0.36) and among drainages within region ...