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A Astyanax mexicanus from Chiquitita cave B The mysid shrimp, Spelaeomysis quinterensis, also from Chiquitita cave. Both stygobitic organisms have overlapping biogeographic ranges throughout the El Abra karstic area, in northeaster Mexico.
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Cave localities of A. mexicanus whose mitochondrial DNA has been analyzed. With larger font and underlined are localities where S. quinterensis were also collected. In red are caves harboring lineage A and in blue those with lineage B for both mtDNA in Astyanax and histone 3 for S. quinterensis. Notice that lineage B is restricted to a small biogeographical zone, circled in blue. A Molino B Caballo Moro C Pachón D Yerbaniz E Japones F Sabinos G Tinaja H Piedras I Curva J Chica K Chiquitita L Rio Subterraneo. (Figure modified from
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A, Base pair differences of histone 3 sequences between mysid shrimps. Specimens from central Sierra de El Abra (Lineage B) are markedly different from all other populations (Lineage A).
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Pylogeographical convergence between mysid shrimps in the Sierra de El Abra and the mtDNA of Astyanax cavefish (right). Both aquatic species harbor the evolutionary signature of a phylogeographical discordance, where genetic markers of populations in central Sierra de El Abra are extremely distinct from the rest of the populations. Nuclear tree (left) based on the consensus of isoenzymes, RAPDs, microsatellite, and genomic sequences. a) Pachón as representative of northern populations. b-c) Sabinos and Tinaja as representative of central populations. d) Chica and Chiquitita as representative of southern populations.