Influence of the winter phytoplankton bloom on the settled material in a temperate shallow estuary

Guinder, Valeria A.; Abbate, M. Celeste López; Berasategui, Anabela A.; Negrin, Vanesa Lorena; Zapperi, Georgina; Pratolongo, Paula Daniela; Severini, Melisa D. Fernández; Popovich, Cecilia A.

doi:10.1016/j.oceano.2014.10.002

Cited by 37 publications

(18 citation statements)

References 46 publications

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“…In particular, the mean oral diameter of the 20 tintinnid species reported in the Bahía Blanca Estuary was 41 µm, suggesting that the size spectrum of prey are below 10-15 µm (Dolan et al 2012). The prey size spectrum of tintinnids fall well between the size range of suspended sediments in the Bahía Blanca Estuary, which varies between 1-50 µm while the modal value is 10 µm (Guinder et al 2015). Above NTU, water turbidity produced a negative effect on zooplankton groups, denoting that this factor may be considered as an ecological disturbance.…”

Section: Accepted Manuscriptmentioning

confidence: 87%

“…Predominant NW winds run parallel to the estuarine main channels and produce high energy wind waves that enhances the erosion of tidal flats Sequeira 1989, Pratolongo et al 2010). Grain size in the lower mudflats are in the very coarse to fine silt range (mode of 32 µm), while suspended sediments size in the water column varies between 1 and 50 µm (mode of 10 µm) (Guinder et al 2015, Zapperi et al 2017).…”

Section: Study Areamentioning

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: Accepted Manuscriptmentioning

confidence: 87%

Section: Study Areamentioning

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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“…Este marcado efecto estacional es común en los estuarios templados. Como en nuestro estudio, el invierno comúnmente tiene valores mínimos en abundancia y diversidad, mientras que el máximo se encuentra en la primavera luego de la floración del fitoplancton (Chainho et al 2006, Guinder et al 2015, Quiroga et al 2016. Por lo tanto, si bien el gas en los sedimentos genera una disminución en la abundancia y diversidad, estos parámetros se ven más afectados por la estacionalidad.…”

Section: Efectos De Los Sedimentos Gasíferos Sobre La Comunidad Bentóunclassified

Distribution, vertical position and ecological implications of shallow gas in Bahía Blanca estuary (Argentina)

Bravo

Aliotta

Fiori

et al. 2018

Estuarine, Coastal and Shelf Science

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The aim of this thesis is to characterize the shallow gas deposits of the inner area of the Bahía Blanca estuary and to evaluate the effect of the gas-bearing sediments on the associated subtidal benthic communities. For this purpose, the distribution of shallow gas in the estuary was mapped through the analysis of highresolution seismic records. Based on this map, two study sites were selected (with gas and control) that only differed in the presence of gas in contact with the surface of the seabed. Acoustic methods were used to determine the stratigraphy and morphology of the site with gas and the adjacent area. In addition, the gas sediments were evaluated by means of the following analyses: grain size, organic matter content, X-rays and HPLC head space measurement. The benthic organisms of both sites were compared in terms of abundance, biomass, diversity, evenness, species richness, taxonomic and functional structure. The gas was found widely distributed in the estuary, both near and in contact with the surface of the seabed of the inner area of the Bahía Blanca estuary. It was evidenced in the form of acoustic turbidity and acoustic blanking. The seismo-stratigraphic column presented five seismic sequences of the late Pleistocene-Holocene. It was established that the gas origin is biogenic, being associated with a Middle Holocene deposit, from which it migrated until it was in contact with the surface of the seabed due to the permeability of the overlying strata. The gas in the surface of the seabed was evidenced in sonograms by means of the attenuation of the acoustic signal, which evidences a low cohesion Índice Dedicatoria…………………………………………………………………………………………………….I

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“…Significantly higher water turbidity in BM may be an additional factor explaining contrasting trophic pathways in both sites. In fact, the prey size spectrum of ciliates is within the size range of suspended sediments in the Bahía Blanca Estuary (Guinder et al 2015), and a high concentration of inedible suspensoids likely interfered with grazers selectivity, especially in BM. Similar prey switching, from HNF to micro-sized phytoplankton, however, was reported in the Kaštela Bay under intense eutrophication (Šolić et al 2010).…”

Section: Eutrophication Effect On Carbon Transfer Among the Microbialmentioning

confidence: 99%

Eutrophication disrupts summer trophic links in an estuarine microbial food web

et al. 2019

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Eutrophication is the most widespread effect of urban development in coastal areas. To elucidate how nutrient loading affects the carbon pathways at the base of food chains, we quantified the carbon transfer among microbial components, from prokaryotes to microzooplankton. For this purpose, we performed two size-fractionation feeding experiments during late summer under moderate (N: 28.5 μM, P: 0.92 μM, Si: 45.8 μM) and severe (N: 173.9 μM, P: 3.5 μM, Si: 67.2 μM) cultural eutrophication in the Bahía Blanca Estuary (Argentina). In both experiments, prokaryotes were largely dominated by heterotrophic forms, small diatoms dominated among autotrophs, and heterotrophic nanoflagellates were the most abundant among protistan grazers. Under severe eutrophication, however, the average biomass was 75% lower for all autotrophic and heterotrophic components. Nutrient loading sustained a higher growth rate of heterotrophic bacteria and phytoplankton but implied poorer trophic transfer. Under moderate eutrophication, daily productivity of nanoplankton and bacteria grazed was 157% and 154%, respectively, while under severe eutrophication, this percentage dropped to 3.54% and 33.7%, respectively. In addition, under excess nutrient conditions, microzooplankton evidenced an active prey switching toward the most abundant prey (diatoms). Weak top-down control of bacterial biomass along with trophic decoupling between microzooplankton and nanoflagellates, constituted a dead-end of bacterial biomass under severe cultural eutrophication. This inefficient carbon transfer can potentially produce a positive feedback by exacerbating organic matter accumulation.

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Influence of the winter phytoplankton bloom on the settled material in a temperate shallow estuary

Cited by 37 publications

References 46 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

Distribution, vertical position and ecological implications of shallow gas in Bahía Blanca estuary (Argentina)

Eutrophication disrupts summer trophic links in an estuarine microbial food web

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