Influence of light and mixing regime on bloom‐forming phytoplankton in a subtropical reservoir

Bordet, Facundo; Fontanarrosa, María Soledad; O’Farrell, Inés

doi:10.1002/rra.3189

Cited by 48 publications

(48 citation statements)

References 61 publications

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“…The hypothesis of the existence of two independent fish populations in the area of Salto Grande is supported by previous studies of population genetics and population dynamics in P. lineatus (Fuentes et al, 2016;INIDEP, 2008;Rueda, Carriquiriborde, Monzón, Somoza, & Ortí, 2013;Sverlij, Geracitano, & Espinach Ros, 1992). This hypothesis is also supported by Paolucci (2002) (Bordet, Fontanarrosa, & O'Farrell, 2017;Bonilla et al, 2015;Chalar et al, 2002;Giannuzzi et al, 2011; Joint Technical Commission of Salto Grande, unpublished monitoring data). Bordet et al (2017) concluded that the presence of this cyanotoxin was positively correlated with the abundance of Microsystis sp.…”

Section: Direct Effects: Independence Between the Two Reproductive mentioning

confidence: 54%

Impact of a hydroelectric power plant on migratory fishes in the Uruguay River

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Dams alter river functioning and hinders the free movement of migratory fishes. We analysed the effects of a subtropical dam on the reproduction of migratory fishes using data from ichthyoplankton monitoring surveys. These were conducted at six sampling stations upstream, downstream and within the reservoir on a weekly basis during 6 years. The dam had a direct impact on fish movement, leading to the fragmentation of fish populations. Two different and independent reproductive areas became evident: one located in the reservoir headwater area and the other downstream of the dam. The long temporal scale of our study facilitated the detection of the impact of Salto Grande on the species of ichthyoplankton. Freshwater secondary fish species (mainly Lycengraulis grossidens) increased in abundance in the stations located inside the reservoir and closer to the dam, whereas most fishes found in the headwater of the reservoir corresponded to river migratory species (potamodromous fish). These differences are most likely due to changes in the physicochemical characteristics of the water induced by the transformation of a river into a reservoir. During rainy summers, Microcystis spp. densities were lower than 1,000 cells ml −1 and fish densities were higher than 4 ind. m −3 , whereas in dry summers, there were important Microcystis spp. blooms (401,573 ± 112,559 cells ml −1) and fish larvae decreased sharply (<1 ind. m −3) in the reservoir headwater area. This could indicate that the discharge of water in the reservoir may also indirectly affect the regulation of fish reproduction. The alternating periods between dry and rainy summers associated with El Niño-Southern Oscillation poses a challenge to ichthyofauna management in the reservoir.

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Section: Direct Effects: Independence Between the Two Reproductive mentioning

confidence: 54%

Impact of a hydroelectric power plant on migratory fishes in the Uruguay River

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“…: Bonilla, et al, 2015;Haakonsson, et al, 2017;Pacheco, et al, 2010;Crisci, et al, 2017). Floraciones de cianobacterias filamentosas también han sido observadas en Salto Grande, pero en mucho menor proporción (Bordet, et al, 2017). En Rocha, especialmente en la Laguna de Castillos, se han registrado floraciones de cianobacterias en varias ocasiones anteriores, principalmente especies filamentosas (Pérez, et al, 1999;Martínez, 2014;Martínez et al, 2016), al igual que en la presente temporada estival (Martínez, observación personal).…”

Section: Causas De Las Floraciones: Origen Alóctono Por Aportes Desdeunclassified

“…Se ha registrado frecuentemente la ocurrencia de floraciones del CMA en los embalses de Salto Grande y del Río Negro (e.g. : González-Piana, et al, 2017;Bordet, et al, 2017). Estas floraciones podrían ser transportadas desde los embalses hacia el tramo final del río Uruguay y luego al RdlP.…”

Section: Causas De Las Floraciones: Origen Alóctono Desde Ríos Uruguaunclassified

“…; Radiocystis, Sphaerocavum), que comparten características fenotípicas y origen filogenético y se agrupan en el complejo Microcystis aeruginosa (CMA) ( Otsuka, et al, 2000). El CMA es frecuente en cuerpos de agua continentales y costeros del mundo (Harke, et al, 2016), de la región (Andrinolo, et al, 2007;Dörr, et al, 2010;Sathicq, et al, 2015;O'Farrell, et al, 2012;Bordet, et al, 2017;Aguilera, et al, 2018) y de nuestro país (Ferrari y Vidal, 2006;Vidal y Britos, 2012;González-Piana, et al, 2017). Estas floraciones producen en general cianotoxinas, que son denominadas microcistinas y son primariamente hepatotóxicas (De León y Yunes, 2001;Brena, et al, 2006;Andrinolo, et al, 2007;Feola, et al, 2010;Pírez, et al, 2013;Bonilla, et al, 2015;Kruk, et al, 2015).…”

Section: Introducción Floraciones De Cianobacteriasunclassified

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Floración excepcional de cianobacterias tóxicas en la costa de Uruguay, verano 2019

Kruk¹,

Martínez

Escalera

et al. 2019

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KruK, Carla (1,2); Martínez, ana (3); Martínez de la esCalera, Gabriela (4); trinChin, roMina (5); Manta, Gastón (5); seGura, anGel M. (6); PiCCini, Claudia (4); brena, beatriz (7); Fabiano, GraCiela (3,8); Pirez, MaCarena (9); Gabito, lourdes (2); alCántara, iGnaCio (2); YanniCelli, beatriz (2) (1) instituto de eColoGía Y CienCias aMbientales, FaCultad de CienCias, udelar, Montevideo, uruGuaY (2) eColoGía FunCional de sisteMas aCuátiCos, Centro universitario reGional del este (Cure), udelar, roCha, uruGuaY. (3) direCCión naCional de reCursos aCuátiCos, la PaloMa, MGaP, roCha, uruGuaY. (4) dePartaMento de MiCrobioloGía, instituto de investiGaCiones biolóGiCas CleMente estable, MeC, Montevideo, uruGuaY,

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“…Los primeros registros de floraciones de Microcystis spp. en Uruguay fueron en el embalse de Salto Grande (Quirós y Luchini, 1982) y en la actualidad se siguen registrando floraciones en todas las estaciones del año (Bordet, et al, 2017). Asimismo, Kruk et al (2015) detectaron la presencia de floraciones de especies de Microcystis en el Río Uruguay tanto en verano como en invierno, sugiriendo que dadas las condiciones nutricionales adecuadas estos organismos son capaces de proliferar a bajas temperaturas.…”

Section: Introductionunclassified