Cabral Henrique N.

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Cabral
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Henrique N.
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  • Preprint
    Otolith geochemistry discriminates among estuarine nursery areas of Solea solea and S. senegalensis over time
    ( 2012-04) Tanner, Susanne E. ; Reis-Santos, Patrick ; Vasconcelos, Rita P. ; Franca, Susana ; Thorrold, Simon R. ; Cabral, Henrique N.
    Otolith geochemistry is used increasingly as a natural tag to retrospectively determine habitat use in marine fishes. It is necessary to first conduct a thorough assessment of spatio-temporal variability before attempting to use the approach to determine estuarine residency or natal origins. In particular, knowledge of temporal variation at different scales is important when such variability may confound spatial discrimination. We assayed elements and calculated the elemental ratios to Ca (Li:Ca, Mg:Ca, Mn:Ca, Cu:Ca, Sr:Ca, Ba:Ca, Pb:Ca) in otoliths of juvenile Solea solea and Solea senegalensis, collected over several months in 2006 and 2009 in Portuguese estuaries, using laser ablation inductively coupled plasma mass spectrometry (LA ICP-MS). The elemental compositions of the otoliths varied significantly between and within years in both of the species, although the within-year variability did not interfere in spatial discrimination. The overall classification accuracy of juveniles to their estuaries of origin varied among the years and species, ranging from 71.0% to 80.1%. Established elemental signatures constitute the baseline data for future assessments of connectivity between juvenile and adult populations of the two sole species.
  • Preprint
    Integrating microsatellite DNA markers and otolith geochemistry to assess population structure of European hake (Merluccius merluccius)
    ( 2014-03) Tanner, Susanne E. ; Perez, Montse ; Presa, Pablo ; Thorrold, Simon R. ; Cabral, Henrique N.
    Population structure and natal origins of European hake were investigated using microsatellite DNA markers and otolith geochemistry data. Five microsatellites were sequenced and otolith core geochemical composition was determined from age-1 hake collected in the northeast Atlantic Ocean and the Mediterranean Sea. Microsatellites provided evidence of a major genetic split in the vicinity of the Strait of Gibraltar, separating the Atlantic and the Mediterranean populations, with the exception of the Gulf of Cádiz. Based on classification models using otolith core geochemical values individuals’ natal origins were identified, although with an increased error rate. Coupling genotype and otolith data increased classification accuracy of individuals to their potential natal origins while providing evidence of movement between the northern and southern stock units in the Atlantic Ocean. Information obtained by the two natural markers on population structure of European hake was complementary as the two markers act at different spatio-temporal scales. Otolith geochemistry provides information over an ecological time frame and on a fine spatial scale, while microsatellite DNA markers report on gene flow over evolutionary time scales and therefore act on a broader spatio-temporal resolution. Thus, this study confirmed the usefulness of otolith geochemistry to complement the assessment of early life stage dispersal in populations with high gene flow and low genetic divergence.