Species-level ichthyoplankton dynamics for 97 fishes in two major river basins of the Amazon using quantitative metabarcoding

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Bendezú-Roca Y.
Canchanya-Huaman Y.
Guerra Torres, Jorge Andrés
Mayta-Armas A.F.
Pomalaya-Velasco J.
Ramos-Guivar J.A.
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Blackwell Publishing Ltd
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The Amazon basin holds the world's largest freshwater fish diversity. Information on the intensity and timing of reproductive ecology of Amazonian fish is scant. We use a metabarcoding method by capture using a single probe to quantify species-level ichthyoplankton dynamics. We sampled the Marañón and the Ucayali rivers in Peru monthly for 2 years. We identified 97 species that spawned mainly during the flood start, the flood end or the receding periods, although some species had spawning activity in more than one period. This information was new for 40 of the species in the Amazon basin and 80 species in Peru. Most species ceased spawning for a month during a strong hydrological anomaly in January 2016, demonstrating the rapidity with which they react to environmental modifications during the breeding season. We also document another unreported event in the Amazon basin, the inverse phenology of species belonging to one genus (Triportheus). Overall larval flow in the Marañón was more than twice that of the Ucayali, including for most commercial species (between two and 20 times higher), whereas the Ucayali accounts for ~80% of the fisheries landings in the region. Our results are discussed in the light of the main anthropogenic threats to fishes, hydropower dam construction and the Hidrovía Amazónica, and should serve as a pre-impact baseline. © 2021 John Wiley & Sons Ltd
The two years of larvae collection in the Marañón and Ucayali rivers were financed by the Concejo Nacional de Ciencia y Tecnología (CONCYTEC) of Peru, who through the Fondo Nacional de Desarrollo Científico, Tecnológico y de Innovación Tecnológica (FONDECYT), project 088-2014-FONDECYT-DE. The LMI EDIA and UMR DIADE financed the metabarcoding analyses. The authors acknowledge the IRD itrop HPC (South Green Platform) at IRD Montpellier for providing HPC resources that contributed to the research results reported within this paper ( - ). We are also grateful to Domingo García for his assistance during field work. We are also grateful to Juan José Palacios Vega (IIAP) for the elaboration of Figure 1 .
Palabras clave
Ucayali, capture, fish larvae, Marañón, metabarcoding, phenology