INVESTIGADORES
VOLPEDO Alejandra Vanina
artículos
Título:
Strontium isotope mapping and its application to study the fish life history (Salminus brasiliensis) in semi-fragmented rivers (La Plata Basin, South America)
Autor/es:
AVIGLIANO, ESTEBAN; CHUNG, MING-TSUNG; POUILLY, MARC; HUANG, KUO-FANG; CASALINUOVO, MIGUEL; DOMININO, JAEL; SILVA, NATALIA; SÁNCHEZ, SEBASTIAN; FACETTI, JUAN F.; VOLPEDO, ALEJANDRA V.
Revista:
FISHERIES RESEARCH
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2023 vol. 265 p. 1 - 10
ISSN:
0165-7836
Resumen:
Salminus brasiliensis is one of the largest and most important commercial and sporting fish species in South America, of which little is known about its habitat use, especially in semi-fragmented rivers. The aims of thisstudy were to expand the water 87Sr/86Sr baseline of the La Plata Basin, and to study the migratory patterns ofS. brasiliensis from Paran´a dam-free stretch and a representative tributary semi-fragmented using otolith isotopicchemistry. Water samples were collected at 10 sites on the upper Paran´a River and two sites on the middle andlower Carcaran´a Basin (tributary of the lower Paran´a River). Fourteen fish were caught in the upper Paran´a Riverand 13 in two sites of the middle and lower Carcaran´a Basin. 87Sr/86Sr was measured in water and otolith coreto-edge transect by MC-ICPMS and LA-MC-ICPMS, respectively. Water results were incorporated into a datasetwith 53 other sampling points from the La Plata Basin and subjected to a cluster analysis, which resulted in ninedifferentiable chemical signatures. Discriminant analysis confirmed the presence of at least eight contrastingisotopic signals. Based on the otolith core 87Sr/86Sr, four individuals from the upper Paran´a River were classifiedas originating from Paraguay sub-basin, while the rest were assigned to Paran´a River. All fish from the Carcaran´asub-basin were classified as originating from the Paran´a River, except two individuals which were assigned to theCarcarana sub-basin. Results indicated that the fish run up the Carcaran´a sub-basin overcoming up to three openspillways, and could live there for years and even reproduce. However, the Paran´a River had the largestcontribution to the fish caught in both the upper Paran´a River and the Carcarana sub-basin.