List of aquatic insects from the Limnology Section deposited in the Entomology Collection of the Faculty of Sciences, University of the Republic, Uruguay.

Se describe el inventario de insectos colectados por la Sección Limnología en diversos ambientes acuáticos de Uruguay entre 1984 y 2007, con el objetivo de dar a conocer su ingreso a la Colección de Entomología de la Facultad de Ciencias. Las muestras incluyen 10 órdenes, 43 familias y 41 géneros.The inventory of insects collected by the Section of Limnology in various aquatic environments of Uruguay between 1984 and 2007 is described with the aim of publicizing their entry into the Entomology Collection of the Faculty of Sciences. The samples include 10 orders, 43 families, and 41 genera

Blooms of toxic Raphidiopsis raciborskii in Laguna del Sauce (Uruguay): environmental drivers and impacts

Laguna del Sauce is a eutrophic shallow lake and the second drinking water source in Uruguay. This ecosystem suffers recurrent blooms of potentially toxic nitrogen-fixing cyanobacteria, mostly during summertime. Here we analyze environmental drivers and potential impacts of blooms of the toxic cyanobacteria Raphidiopsis raciborskii in Laguna del Sauce from 2003 to 2020, and assess its effects on governance and biomonitoring. We registered three blooms of R. raciborskii, in 2004, 2015, and 2020, the last two expressed saxitoxin (lack of toxicity information for 2004). The 2015 bloom occurred in autumn, reaching an absolute biovolume of 104 mm3 l−1, and had high saxitoxin concentrations (up to 9.8 μg l−1) which continued to be detected even after the bloom collapsed. This was the first saxitoxin register in this ecosystem and drastically affected the drinking water supply. After this massive bloom, a monitoring program was established which continues up to date. The 2020 bloom also occurred in autumn and lasted until winter; it was of lower magnitude (up to 6.3 mm3 l−1) and had lower saxitoxin concentration (up to 0.9 μg l−1) compared to the 2015 bloom. Blooms of R. raciborskii were associated with a combination of persistent low water level, low water color, and high water transparency, conditions that rarely coincide in this ecosystem. Hence, the programs which started after the 2015 bloom, allowed better characterizing the environmental drivers of R. raciborskii blooms in Laguna del Sauce. Furthermore, these implied adapting the ecosystem management and water treatment strategies, and strengthening of academia—stakeholders’ interactions.Fil: González Madina, Lucía. Universidad de la República; UruguayFil: Levrini, Paula. Universidad de la República; UruguayFil: de Tezanos Pinto, Paula. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Botánica Darwinion. Academia Nacional de Ciencias Exactas, Físicas y Naturales. Instituto de Botánica Darwinion; ArgentinaFil: Burwood, Maite. Universidad de la República; UruguayFil: Crisci, Carolina. Universidad de la República; UruguayFil: Cardozo, Andrea. Universidad de la República; UruguayFil: Lagomarsino, Juan José. No especifíca;Fil: Pacheco, Juan Pablo. University Aarhus; DinamarcaFil: Fosalba, Claudia. Universidad de la República; UruguayFil: Méndez, Gustavo. No especifíca;Fil: Garrido, Lydia. No especifíca;Fil: Mazzeo, Néstor. Universidad de la República; Urugua