Time-varying environmental control of phytoplankton in a changing estuarine system

Abbate, M. Celeste López; Molinero, Juan Carlos; Guinder, Valeria A.; Perillo, Gerardo M. E.; Freije, Rubén Hugo; Sommer, Ulrich; Spetter, Carla Vanesa; Marcovecchio, Jorge Eduardo

doi:10.1016/j.scitotenv.2017.08.002

Cited by 39 publications

(12 citation statements)

References 77 publications

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“…During the studied period , we identified a progressive decline of tintinnids and A. tonsa adults and a less obvious decline on oligotrichs concentration. Parallel to the negative trend of zooplankton groups, phytoplankton community showed a drastic erosion of seasonal peaks and a shift from the typical unimodal productivity pattern to a bimodal regime (López-Abbate et al 2017). Along the time series, two tintinnids species, Tintinnopsis brasiliensis and T.…”

Section: Ciliates and A Tonsa Interannual Responsementioning

confidence: 93%

“…Such anomalies are associated with stronger than normal westerlies over the mid-high-latitudes and weaker westerlies in the mid-latitudes (Marshall 2003). Concurrently, water turbidity has shown a positive trend in the last 15 years, presumably as a response to wind shifts and the lateral erosion of salt marshes associated with sea level rise (Pratolongo et al 2013, López-Abbate et al 2017. Modelling approaches revealed the emergence of both, wind speed and water turbidity, as dominant factors driving the decline of chlorophyll concentration in recent years (López-Abbate et al 2017), however, the interannual response of phagotrophic plankton has been so far overlooked.…”

Section: Introductionmentioning

confidence: 99%

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Long-term changes on estuarine ciliates linked with modifications on wind patterns and water turbidity

Abbate

Molinero

Perillo

et al. 2019

Marine Environmental Research

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Highlights ► Planktonic ciliate's abundance decreased over the last 25 years in a shallow estuary. ► Decreasing cell abundance was linked to changes in wind dominant regimes and increased water turbidity. ► Tintinnids were more vulnerable to wind patterns and turbidity and lost synchrony with primary productivity. ► Interannual variability of the copepod Acartia tonsa followed the changes in ciliate community. ► Erosive processes in shallow estuaries impact on the interannual dynamics of ciliates and such effects can cascade-up to copepods.

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Section: Ciliates and A Tonsa Interannual Responsementioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Long-term changes on estuarine ciliates linked with modifications on wind patterns and water turbidity

Abbate

Molinero

Perillo

et al. 2019

Marine Environmental Research

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“…Lower concentrations of phytoplankton were found in the center of El Rincón, where the anticyclone gyre developed. Conversely, the growth of large diatoms with high carbon biomass at most coastal stations might be related with nutrient inputs from land such as the Bahía Blanca Estuary (Guinder et al, 2010;Kopprio et al, 2017;López Abbate et al, 2017) as well as with the mixed and turbid water column (Litchman and Klausmeier, 2008) characteristic of this shallow area (Guinder et al, 2009;Delgado et al, 2015). In eutrophic estuaries and adjacent coastal shelves, diatoms commonly dominate the phytoplankton, and this group is of high nutritional quality and facilitates efficient trophic transfer to support the secondary production (Winder et al, 2017).…”

Section: Environmental Conditions and Distribution Of Planktonmentioning

confidence: 99%

Plankton Multiproxy Analyses in the Northern Patagonian Shelf, Argentina: Community Structure, Phycotoxins, and Characterization of Toxic Alexandrium Strains

et al. 2018

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The extensive Argentine continental shelf supports high plankton productivity and fish catches. In particular, El Rincón coastal area and the adjacent shelf fronts (38.5-42 • S, 58.5-62 • W) comprise diverse habitats and hold species of economic and ecological value. So far, studies of the microbial community present at the base of the food web remain scarce. Here, we describe the late winter plankton (5-200 µm) structure in terms of abundance, biomass, species composition, functional groups, and phycotoxin profiles in surface waters of El Rincón in September 2015. Diatoms are the most abundant and the largest contributors to carbon biomass at most stations. They dominated the coastal and inner-shelf (depths <50 m), while dinoflagellates and small flagellates (<15 µm) dominated offshore at the middle-shelf waters (depth ∼100 m). In addition, large (>20 µm) heterotrophic protists such as various ciliates and dinoflagellates species were more abundant offshore. Scanning of phycotoxins disclosed that paralytic shellfish poisoning (PSP) toxins were dominated by gonyautoxins-1/4 (GTX1/4), whereas lipophilic toxins were detected in low abundance, for example, domoic acid (DA). However, a bloom of Pseudo-nitzschia spp. (up to 3.6 × 10 5 cells L −1) was detected at inner-shelf stations. Pectenotoxin-2 (PTX-2) and 13-desmethyl spirolide C (SPX-1) were the most abundant in the field. The PTX-2 cooccurred with Dinophysis spp., mainly D. tripos, while SPX-1 dominated at middle-shelf stations, where cells of Alexandrium catenella (1 strain) and A. ostenfeldii (3 strains) were isolated. The quantitative PSP profiles of the Alexandrium strains differed significantly from the in situ profiles. Moreover, the three A. ostenfeldii strains produced PSP and additionally, five novel spirolides. Phylogenetic analyses of these newly isolated strains

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“…The identification of the segments allowed us to split the time-series. The number of breakpoints was set, so that the confidence intervals of the different points did not overlap (Abbate et al, 2017).…”

Section: Detection Of Temperature and Precipitation Structural Changesmentioning

confidence: 99%

Climate regionalization and trends based on daily temperature and precipitation extremes in the south of the Pampas (Argentina)

Ferrelli

Brendel

Aliaga

et al. 2019

CIG

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The south of , as most of Argentina, is a semiarid region. Its economy is based on rain-fed agriculture and livestock. Traditionally, the climate has been studied considering the analyses of monthly and annual climate parameters, but there is evidence that in this type of areas, the short-term climatic events have a substantial impact on the climate. Therefore, this study aimed at developing a climate regionalization from the analysis of daily temperature and precipitation extremes in the south of the Pampas for the period 1970-2017. Subsequently, it focuses on analyzing both trends and breakpoints of these events in the different sub-climates. To do so, we applied a Cluster-based Principal Component Analyses with a Ward hierarchical supervised method to generate a climate regionalization considering 29 daily extreme climatic indices and the elevation. We identify four sub-regions, and we analyzed trends during 1970-2017, and in the two-time series defined by applying breakpoints. Both minimum and maximum temperatures and precipitation had structural changes in the last 15 years, exposing the region to warming and dryness trends. The maximum temperature increases 0.5ºC, while precipitation decreases 30 mm. The short-term climate variability allows us to identify areas climatically more detailed and to conclude that the south of the Pampas is characterized by its high dependency on short-term climatic events. Regionalización y tendencias climáticas basadas en eventos extremos térmicos y pluviométricos diarios en el sur de la Región Pampeana (Argentina)RESUMEN. El sur es, al igual que la mayor parte de Argentina, una región semiárida. Su economía se basa en la agricultura de secano y la ganadería. Tradicionalmente, el clima Ferrelli et al. 394Cuadernos de Investigación Geográfica 45 (1), 2019, pp. 393-416 ha sido estudiado considerando los eventos térmicos y pluviométricos mensuales y anuales. Sin embargo, existe evidencia científica de que los eventos climáticos a corto plazo (diarios) tienen un impacto sustancial en el clima. El objetivo de este trabajo es desarrollar una regionalización climática a partir del análisis de las temperaturas y precipitaciones diarias extremas en el sur de la Región Pampeana durante el período 1970-2017. Complementariamente, este trabajo se enfoca en analizar las tendencias de estos eventos en cada sub-clima durante dos períodos de tiempo de la serie 1970-2017. Para generar la regionalización, aplicamos un Análisis de Componentes Principales y un Análisis de Conglomerados utilizando el método supervisado de Ward, considerando 29 índices climáticos extremos diarios y la elevación. Como resultado obtuvimos cuatro subregiones. Además, analizamos la tendencia de los 29 índices climáticos extremos diarios durante el período 1970-2017 y en dos sub-series dentro de este período definidas mediante la aplicación de puntos de interrupciones o cambios estructurales. En el sur de la región Pampeana, la temperatura y la precipitación presentaron cambios estructurales en los últimos 15 años, lo q...

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Time-varying environmental control of phytoplankton in a changing estuarine system

Cited by 39 publications

References 77 publications

Long-term changes on estuarine ciliates linked with modifications on wind patterns and water turbidity

Long-term changes on estuarine ciliates linked with modifications on wind patterns and water turbidity

Plankton Multiproxy Analyses in the Northern Patagonian Shelf, Argentina: Community Structure, Phycotoxins, and Characterization of Toxic Alexandrium Strains

Climate regionalization and trends based on daily temperature and precipitation extremes in the south of the Pampas (Argentina)

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