Strontium isotopes (⁸⁷Sr/⁸⁶Sr) were evaluated as a potential method for studying the geographical origin of populations and movements patterns of migratory fish from the La Plata Basin (Paraná, Uruguay and Bermejo Rivers and Río de la Plata Estuary, South America). Surface water samples were collected at 43 sites during austral summer and winter (2018) while, Surubí (Pseudoplatystoma corruscans), Patí (Luciopimelodus pati), dorado (Salminus brasiliensis) and sábalo (Prochilodus lineatus) fishes were collected at seven locations. Water ⁸⁷Sr/⁸⁶Sr ratio was analysed by MC‐ICP‐MS (N = 74) and otolith core‐to‐edge ⁸⁷Sr/⁸⁶Sr transects (N = 50) were measured by LAfs‐MC‐ICP‐MS. Several water bodies presented significantly different (p < 0.05) water ⁸⁷Sr/⁸⁶Sr values. A ~ 1:1 relationship was found between ⁸⁷Sr/⁸⁶Sr measured in edge otolith and water. Data provide novel perspectives about migratory behaviour for all species, such as potential cross‐border migrations between countries of more than 1,000 km recorded for L. pati, S. brasiliensis and P. lineatus. These species seem to move between the Paraná and Uruguay rivers, which imply using the delta or the estuary as a corridor between them. Discriminant analysis based on otolith core ⁸⁷Sr/⁸⁶Sr suggested that the four species studied originate in sub‐basins different from those that were collected and revelled the presence of several potential spawning/nursery areas. The otolith ⁸⁷Sr/⁸⁶Sr profiles also suggested movements between different environments such as reservoirs, large plain rivers, mountain streams, floodplain valleys and estuaries. These results show the potential of ⁸⁷Sr/⁸⁶Sr as a tool for tracking the life history of fishes, and depict for the first time a complex use of the La Plata basin by the fishes, providing new information for management plans at the regional level.

中文翻译：

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锶同位素（87Sr / 86Sr）揭示了拉普拉塔盆地淡水mi游鱼类的生活史

锶同位素（⁸⁷ Sr / ⁸⁶ Sr）被评估为研究拉普拉塔盆地（帕拉纳河，乌拉圭河和Bermejo河以及里约拉普拉塔河口，南美洲）迁徙鱼类的地理起源和迁移方式的潜在方法。在夏季的夏季和冬季（2018年），在43个地点采集了地表水样本，同时在七个地点采集了Surubí（Pseudoplatystoma corruscans），Patí（Luciopimelodus pati）， dorado（Salminus brasiliensis）和sábalo（Prochilodus lineatus）鱼类。通过MC-ICP-MS分析水⁸⁷ Sr / ⁸⁶ Sr的比例（N= 74）和耳石核心到边缘的⁸⁷ Sr / ⁸⁶ Sr断面（N = 50）通过LAfs-MC​​-ICP-MS测量。几个水体的 水⁸⁷ Sr / ⁸⁶ Sr值存在显着不同（p <0.05）。在边缘耳石中测得的⁸⁷ Sr / ⁸⁶ Sr与水之间存在〜1：1的关系。数据为所有物种的迁徙行为提供了新颖的见解，例如记录在巴蒂氏乳杆菌，巴西沙门氏菌和线虫对虾超过1,000公里的国家之间的潜在跨界迁移。。这些物种似乎在巴拉那河和乌拉圭河之间移动，这意味着将三角洲或河口用作它们之间的走廊。基于耳石核心⁸⁷ Sr / ⁸⁶ Sr的判别分析表明，所研究的四种物种起源于与收集的亚盆地不同的亚盆地，并揭示了一些潜在的产卵/育苗区域。otolith ⁸⁷ Sr / ⁸⁶ Sr剖面还表明了在不同环境之间的运动，例如水库，宽阔的平原河川，山间溪流，洪泛区山谷和河口。这些结果显示出⁸⁷ Sr / ⁸⁶的潜力Sr是跟踪鱼类生活史的工具，并首次描述了鱼类对拉普拉塔盆地的复杂使用，从而为区域一级的管理计划提供了新信息。