Artículo
Increases in Picocyanobacteria Abundance in Agriculturally Eutrophic Pampean Lakes Inferred from Historical Records of Secchi Depth and Chlorophyll-a
Zagarese, Horacio Ernesto
; Diovisalvi, Nadia Rosalia
; Gonzalez Sagrario, Maria de Los Angeles
; Izaguirre, Irina
; Fermani, Paulina
; Unrein, Fernando
; Castro Berman, Manuel
; Pérez, Gonzalo
Fecha de publicación:
01/2022
Editorial:
Multidisciplinary Digital Publishing Institute
Revista:
Water
ISSN:
2073-4441
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Phytoplankton size structure has profound consequences on food-web organization and energy transfer. Presently, picocyanobacteria (size < 2µm) represent a major fraction of the autotrophic plankton of Pampean lakes. Glyphosate is known to stimulate the development of picocyanobacteria capable of degrading the herbicide. Due to the worldwide adoption of glyphosate-resistant crops, herbicide usage has increased sharply since the mid-1990s. Unfortunately, there are very few studies (none for the Pampa region) reporting picocyanobacteria abundance before 2000. The proliferation of µm sized particles should decrease Secchi disc depth (ZSD). Therefore ZSD, conditional to chlorophyll-a, may serve as an indicator of picocyanobacteria abundance. We use generalized additive models (GAMs) to analyze a "validation" dataset consisting of 82 records of ZSD, chlorophyll-a, and picocyanobacteria abundance from two Pampean lakes surveys (2009 and 2015). In support of the hypothesis, ZSD was negatively related to picocyanobacteria after accounting for the effect of chlorophyll-a. We then fitted a "historical" dataset using hierarchical GAMs to compare ZSD conditional to chlorophyll-a, before and after 2000. We estimated that ZSD levels during 2000-2021 were, on average, only about half as deep as those during 1980-1999. We conclude that the adoption of glyphosate-resistant crops has stimulated outbreaks of picocyanobacteria populations, resulting in lower water transparency.
Palabras clave:
UNDERWATER LIGHT CLIMATE
,
EUTROPHICATION
,
GLYPHOSATE
,
CYANOBACTERIA
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Articulos(CCT - LA PLATA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - LA PLATA
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - LA PLATA
Articulos(IBIOMAR)
Articulos de INSTITUTO DE BIOLOGIA DE ORGANISMOS MARINOS
Articulos de INSTITUTO DE BIOLOGIA DE ORGANISMOS MARINOS
Articulos(IEGEBA)
Articulos de INSTITUTO DE ECOLOGIA, GENETICA Y EVOLUCION DE BS. AS
Articulos de INSTITUTO DE ECOLOGIA, GENETICA Y EVOLUCION DE BS. AS
Articulos(IIMYC)
Articulos de INSTITUTO DE INVESTIGACIONES MARINAS Y COSTERAS
Articulos de INSTITUTO DE INVESTIGACIONES MARINAS Y COSTERAS
Articulos(INIBIOMA)
Articulos de INST. DE INVEST.EN BIODIVERSIDAD Y MEDIOAMBIENTE
Articulos de INST. DE INVEST.EN BIODIVERSIDAD Y MEDIOAMBIENTE
Citación
Zagarese, Horacio Ernesto; Diovisalvi, Nadia Rosalia; Gonzalez Sagrario, Maria de Los Angeles; Izaguirre, Irina; Fermani, Paulina; et al.; Increases in Picocyanobacteria Abundance in Agriculturally Eutrophic Pampean Lakes Inferred from Historical Records of Secchi Depth and Chlorophyll-a; Multidisciplinary Digital Publishing Institute; Water; 14; 2; 1-2022; 1-12
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