Microplankton dynamics under heavy anthropogenic pressure. The case of the Bahía Blanca Estuary, southwestern Atlantic Ocean

Abbate, M. Celeste López; Molinero, Juan Carlos; Guinder, Valeria A.; Dutto, M. Sofía; Cao, María Sonia Barría de; Ruiz-Etcheverry, Laura A.; Pettigrosso, Rosa E.; Carcedo, M. Cecilia; Hoffmeyer, Mónica S.

doi:10.1016/j.marpolbul.2015.03.026

Cited by 26 publications

(13 citation statements)

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“…In this study, the lower temperature and salinity registered at middle-shelf resulted from the influence of colder Subantarctic shelf waters diluted by low salinity discharges from the Magellan Strait (Palma and Matano, 2012), while the higher water temperatures in the shallow area of El Rincón were due to the northward outflow of high salinity and warmer waters from the San Matías Gulf into the inner-shelf (Palma et al, 2008). The freshwater discharges of the Negro and the Colorado Rivers (Lucas et al, 2005) were detected in situ at the coastal stations near their deltas, while the influence of the highly eutrophic and hypersaline Bahía Blanca Estuary (Guinder et al, 2010;López Abbate et al, 2015) was notable at stations 1 and 12, where the in situ salinities reached the maxima. A particular characteristic of El Rincón area is the formation of an anticyclone gyre in the center during winter, which looses intensification when nearing spring and summer (Palma et al, 2008).…”

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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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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“…Moreover, cultural eutrophication in the Bahía Blanca Estuary has been shown to reduce mesozooplankton biomass during summer (Dutto et al 2012) and the fertility of the copepod Eurytemora americana (Berasategui et al 2018). The negative effect on planktonic grazers was attributed to the combination of several factors, such as hypoxia (Dutto et al 2012) and toxicity of NH4 + and heavy metals (López-Abbate et al 2015, Fernández Severini et al 2017, Berasategui et al 2018.…”

Section: Eutrophication Effect On the Structure Of The Microbial Commmentioning

confidence: 99%

“…Dugdale et al (2007), conducted enclosure experiments in the San Francisco Bay and determined that NH4 + concentration exceeding 4 µM inhibits growth by preventing cells access to NO3 -, although other authors have reported a threshold value close to 10 µM in the Delaware Bay (Yoshiyama and Sharp 2006). NH4 + concentration near the sewage outflow in the Bahía Blanca Estuary can eventually exceed 150 µM (López-Abbate et al 2015), which is known to reduce chlorophyll content, cell abundance and productivity of estuarine phytoplankton (Livingston et al 2002, Yoshiyama andSharp 2006). Algal blooms resulting from cultural eutrophication are in fact associated with much lower NH4 + concentration.…”

Section: Eutrophication Effect On the Structure Of The Microbial Commmentioning

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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“…Actualmente, los estuarios exhiben una clara evidencia de eutrofización debido al aporte de nutrientes de origen antrópico (Nixon & Fulweiler, 2009;Spetter et al, 2015b;López Abbate et al, 2015) y juegan un rol primordial en donde los procesos biogeoquímicos modifican los flujos de nutrientes desde el continente hacia el mar (Lillebø et al, 2004, Van der Zee et al, 2007. En el ambiente acuático, el fósforo (P) disuelto es consumido durante el crecimiento del fitoplancton y luego es regenerado durante la descomposición de la materia orgánica (Sundby et al, 1992).…”

Section: Introductionunclassified

Primer estudio sobre fraccionamiento de fósforo en sedimentos supramareales del estuario de Bahía Blanca (Argentina)

Spetter

Fernández

Abasto

et al. 2020

RMLP

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Los sedimentos estuarinos juegan un rol primordial en los procesos de remineralización de los nutrientes; entre ellos, el fósforo (P) que es un elemento esencial para la vida. En este trabajo, se evaluaron los niveles de P en sedimentos de la capa superficial (S: 0-5mm profundidad) y sub-superficial (SS: 5–10mm profundidad) de la planicie de marea supramareal baja de Puerto Rosales (zona media del estuario de Bahía Blanca, Argentina). A su vez, se presentan los primeros estudios de especiación de P. Se determinó la composición granulométrica, el porcentaje de humedad y de materia orgánica, pH, Eh y la temperatura en los sedimentos con el fin de evaluar su relación con las distintas fracciones de P analizadas. Los resultados mostraron altos niveles de P total (de hasta 1,055 mg P g-1 ps) y no hubo diferencias significativas entre capas, lo que refleja la capacidad de estos sedimentos para retener el P autóctono y/o antropogénico. En general, el P tendió a permanecer como P ligado a minerales fosfatados de Ca y/o como P-refractario o residual (40% y 35%, y 20% y 31% en S y SS, respectivamente). La composición granulométrica del sedimento estaría favoreciendo la retención del P, mientras que la inundación la estaría afectando sobre todo en la fracción correspondiente al P-lábil o adsorbido (11% y 23% para S y SS, respectivamente). La variabilidad observada en la proporción aportada por el P-Fe en ambas capas, parece estar relacionada con la disolución de los PO43- y su difusión hacia la columna de agua a través del agua intersticial.

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Microplankton dynamics under heavy anthropogenic pressure. The case of the Bahía Blanca Estuary, southwestern Atlantic Ocean

Cited by 26 publications

References 50 publications

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

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

Eutrophication disrupts summer trophic links in an estuarine microbial food web

Primer estudio sobre fraccionamiento de fósforo en sedimentos supramareales del estuario de Bahía Blanca (Argentina)

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