2017/02/28 by Esteban Avigliano, Bárbara Maichak de Carvalho, Barbara Carvalho +4 · 10 citations
Environmental Science · #Barbus #Bay #Biology #Catfish #Cyprinidae #Estuary #Fish <Actinopterygii> #Fishery #Geography #Geology #Isotope Analysis in Ecology #Marine Bivalve and Aquaculture Studies #Marine and fisheries research #Oceanography #Otolith #Zoology
paper · open access · doi:10.1017/s0025315417000212
published in Journal of the Marine Biological Association of the United Kingdom 98(4), 855-865 (Cambridge University Press)
openalex publication_date 2017/02/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
The catfish Genidens barbus is a commercial species from South America. The aim of the present study was to examine the inter-annual variability in estuary-specific chemical signatures of otolith cores (Ba:Ca, Mg:Ca, Mn:Ca, Sr:Ca and Zn:Ca ratios) for three estuaries from Argentina and Brazil where adults were collected over multiple years. Secondarily, we evaluated whether the percentages of classification of individuals to their natal origin place are affected by the grouping of several cohorts. Most element:Ca ratios were not significantly different among year cohorts. Results from PERMANOVA revealed significant differences in the multi-element signatures of the otolith core between cohorts for the Plata River estuary (PR) ( P = 0.006) and the Patos Lagoon (PL) ( P = 0.03), while no significant differences ( P = 0.9) were found for Paranaguá Bay (PB). The percentages of spatial classification (discriminant function analyses) decreased to between 15.5 and 25% for PR and PL when cohorts were grouped. This work makes it clear that the temporal variation in the chemical signature of the adult catfish otolith core can greatly affect the percentages of spatial classification.