Mito-Nuclear Sequencing Is Paramount to Correctly Identify Sympatric Hybridizing Fishes
ACTA ICHTHYOLOGICA ET PISCATORIA (2018) 48 (2): 123–141 DOI: 10.3750/AIEP/02348 MITO-NUCLEAR SEQUENCING IS PARAMOUNT TO CORRECTLY IDENTIFY SYMPATRIC HYBRIDIZING FISHES Carla SOUSA-SANTOS1*, Ana M. PEREIRA1, Paulo BRANCO2, Gonçalo J. COSTA3, José M. SANTOS2, Maria T. FERREIRA2, Cristina S. LIMA1, Ignacio DOADRIO4, and Joana I. ROBALO1 1 MARE—Marine and Environmental Sciences Centre, ISPA—Instituto Universitário, Lisboa, Portugal 2 CEF—Forest Research Centre, Instituto Superior de Agronomia, Universidade de Lisboa, Lisboa, Portugal 3 Computational Biology and Population Genomics Group (CoBiG2), Centre for Ecology, Evolution and Environmental Changes (CE3C), Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal 4 Department of Biodiversity and Evolutionary Biology, Museo Nacional de Ciencias Naturales, CSIC, Madrid, Spain Sousa-Santos C., Pereira A.M., Branco P., Costa G.J., Santos J.M., Ferreira M.T., Lima C.S., Doadrio I., Robalo J.I. 2018. Mito-nuclear sequencing is paramount to correctly identify sympatric hybridizing fishes. Acta Ichthyol. Piscat. 48 (2): 123–141. Background. Hybridization may drive speciation and erode species, especially when intrageneric sympatric species are involved. Five sympatric Luciobarbus species—Luciobarbus sclateri (Günther, 1868), Luciobarbus comizo (Steindachner, 1864), Luciobarbus microcephalus (Almaça, 1967), Luciobarbus guiraonis (Steindachner, 1866), and Luciobarbus steindachneri (Almaça, 1967)—are commonly identified in field surveys by diagnostic morphological characters. Assuming that i) in loco identification is subjective and observer-dependent, ii) there is previous evidence of interspecific hybridization, and iii) the technical reports usually do not include molecular analyses, our main goal was to assess the concordance between in loco species identification based on phenotypic characters with identifications based on morphometric indices, mtDNA only, and a combination of mito-nuclear markers.
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