Natalia Buzzi - Academia.edu (original) (raw)

Papers by Natalia Buzzi

Research paper thumbnail of Abundance of microplastics in oysters Crassostrea gigas and water from a highly anthropized estuary

CERN European Organization for Nuclear Research - Zenodo, Nov 17, 2022

Microplastics-MPs-(plastic < 5 mm) have become one of the leading environmental problems due to t... more Microplastics-MPs-(plastic < 5 mm) have become one of the leading environmental problems due to the large amount released into aquatic and terrestrial ecosystems and their possible impacts on organisms and human health. Estuaries are positioned as sinks of MPs, due to the presence of natural and industrial effluents. In Argentina, the Bahía Blanca estuary-BBe-is the second largest estuary in the country and is highly anthropized since it has one of the largest deep ports, the largest petrochemical complex, and urban settlements with untreated sewage waters. The oyster C. gigas is widely used as MPs biomonitoring and is commonly distributed in BBe. This study assesses the concentrations of MPs in surface water and in whole tissue of oysters C. gigas, from the BBe. Two sites of the estuary were sampled, one in the inner zone and the other in the middle area. MPs ranged from 6 to 50 items L-1 in water and from 0 to 2ítems g-1 ww in oyster tissue. There were no significant differences between the water samples and oysters (p > α = 0.25) according to the different sites. Fibers were the most abundant MPs in water and oyster samples, with 78% and 95%, respectively. The color was mainly transparent, followed by blue and black. Regarding the size in water, the MPs < 0.5 mm represented 50%, followed by particles between 1 and 5 mm with 36%. In oysters, MPs between 1 and 5 mm were 48%. Many fibers could originate from the mechanical degradation of clothing textiles and hygiene products that enter the aquatic environment through sewage. Due to the ubiquitous nature of MPs in the environment and their different effects on organisms, studies of this kind represent the basis for implementing sustained monitoring of MPs in water, sediments, and biota.

Research paper thumbnail of Microplastics in commercial seafood: Pleoticus muelleri as a case study in an estuarine environment highly affected by human pressure (Southwestern Atlantic)

Research paper thumbnail of Heavy metals in the Bahia Blanca estuary and its relation with metallothioneins levels in neohelice granulata

En el Estuario de Bahía Blanca se ubican varios puertos, ciudades y uno de los complejos industri... more En el Estuario de Bahía Blanca se ubican varios puertos, ciudades y uno de los complejos industriales más grandes de Sudamérica. En el presente trabajo se analizó la concentración de metales pesados en los sedimentos y en el material particulado en suspensión (MPS) y su relación con los niveles de metalotioneínas (MTs) en el cangrejo Neohelice granulata de dos sitios del estuario sometidos a diferente impacto antrópico. Los metales pesados luego de la digestión de la muestra en medio ácido, fueron leídos mediante ICP-OES y las MTs fueron determinadas por espectrometría UV-visible. Se encontraron diferencias altamente significativas en el contenido de MTs entre ambos sitios y entre cangrejos machos y hembras. Esto posiblemente se deba por un lado al distinto impacto antrópico recibido en cada sitio reflejado a su vez en la concentración de metales pesados en sedimentos y MPS; y naturalmente por el sexo.Centro de Investigaciones Geológica

Research paper thumbnail of Lucha de titanes, neohelice granulata vs. cyrtograpsus angulatus ¿cuál es el mejor bioindicador de metales pesados? : un estudio comparativo en una zona interna del Estuario de Bahía Blanca

El Estuario de Bahía Blanca es un humedal localizado en el sudoeste de la costa bonaerense, que p... more El Estuario de Bahía Blanca es un humedal localizado en el sudoeste de la costa bonaerense, que posee un clima templado perteneciente a la ecorregión patagónica. El aporte de agua dulce proveniente de ríos es escaso en comparación a otros grandes estuarios como el de La Plata y se ha configurado en una región única de mayores ingresiones marinas. Para referirse a este ambiente, se ha acuñado el término “ría" que emerge como una construcción social de los pobladores que refieren a este humedal de transición con contribuciones de pequeños arroyos o riachos. La presión antrópica histórica sobre el estuario basado en las actividades extractivas, lo han convertido en un escenario ecológicamente sacrificable para muchas especies animales y socialmente vaciable para quienes desarrollan sus pequeñas economías en este humedal. Por tanto, es interesante analizar las condiciones ecológicas de este ecosistema desde una perspectiva integral, considerando los organismos que habitan en relaci...

Research paper thumbnail of Tracking Synthetic Microdebris Contamination in a Highly Urbanized Estuary Through Crabs as Sentinel Species: An Ecological Trait-Based Approach

SSRN Electronic Journal, 2022

Research paper thumbnail of Environmental quality assessment by multiple biogeochemical indicators of an intertidal flat under anthropogenic influence from the southwest of Buenos Aires (Argentina)

Environmental Earth Sciences, 2021

Chemical measures combined with biological data (biomarkers) are recommended in monitoring progra... more Chemical measures combined with biological data (biomarkers) are recommended in monitoring programs of marine environments. In the present research, the use of multiples biogeochemical indicators allowed interrelating different environmental measurements to deepen the knowledge of the quality/status of the intertidal flat from Puerto Rosales (Bahía Blanca estuary, Argentina) subjected to anthropogenic pressure. The sediments from this site presented a eutrophic status and high organic matter concentration with high nutritional value for the benthic community. The TPR/TCH ratio (~ 10) would evidence the untreated sewage discharge contribution and increments in protein content due to the complexation of nitrogen during phytodetritus accumulation and degradation. Trace metals levels in the fine sediments were lower than those recommended by international guides for uncontaminated sites. In the sediments, except Cu, all metals analyzed were rarely associated with adverse biological effects. Finally, metallothioneins levels in the burrowing crab Neohelice granulata were lower than those found in the literature and significantly higher in females than in males. Even though the different analyses and indices performed indicate that this intertidal flat is in good environmental condition, the wastewater discharge influenced it. Thus, it is advisable to continue with this kind of study by applying multi-combined proxies in this and other impacted tidal flats.

Research paper thumbnail of Biomonitoreo para la evaluación de metales pesados en sedimentos del estuario de Bahía Blanca bajo impacto antrópico

Research paper thumbnail of Microplastics and suspended particles in a strongly impacted coastal environment: Composition, abundance, surface texture, and interaction with metal ions

Science of The Total Environment, 2021

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Research paper thumbnail of A “new normality” for small-scale artisanal Fishers? The case of unregulated fisheries during the COVID-19 pandemic in the Bahía Blanca estuary (SW Atlantic Ocean)

Ocean & Coastal Management, 2021

Abstract The current COVID-19 pandemic is causing health and economic crises worldwide, but conse... more Abstract The current COVID-19 pandemic is causing health and economic crises worldwide, but consequences are worse for those emerging countries with poor sanitary conditions struggling against economic recessions. Small-scale artisanal fishers (SSAF) should be considered among the “essential workers” since they provide food services; however, the COVID-19 might have altered the normal livelihood and reduced people economic incomes in an already marginalized sector. This situation highlights the fishers' vulnerability, derived from changes in fish stocks caused by climate change, pollution, overharvesting, and informal work (illegal, unreported and unregulated fishing). Therefore, the so-called “new normality” raises big questions about the management of coastal areas and fisheries in developing countries. As a study case, we proposed exploring SSAF from an Argentinian estuary, the Bahia Blanca estuary (SW Atlantic Ocean). Most of them are unregulated after a reconversion program carried out by the local government in 2012. After reviewing the current COVID-19 legislation for coastal fisheries and having virtual encounters with SSAF, we observed they are struggling against the economic crisis caused by the pandemic. According to our observations, imperative measures must be taken to prevent fisheries collapse in the area. In this work, we present a reference point for the post-pandemic management of fisheries that could be considered for emerging public policies.

Research paper thumbnail of COVID-19 pandemic repercussions on plastic and antiviral polymeric textile causing pollution on beaches and coasts of South America

Science of The Total Environment, 2021

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Research paper thumbnail of Integrative assessment of the ecological risk of heavy metals in a South American estuary under human pressures

Ecotoxicology and Environmental Safety, 2021

Biomonitoring of heavy metal pollution through the use of biomarkers could be a difficult task si... more Biomonitoring of heavy metal pollution through the use of biomarkers could be a difficult task since the organisms' physiological changes could shift regarding natural factors (i.e., the season of the year) and due to the anthropogenic pressures of the environment. In the Southwest Atlantic Ocean, where most industrial and developing countries are settled, it is essential to address these concerns to generate information for the stakeholders and monitoring programs that aim to use biochemical biomarkers as early warning signals to detect heavy metal pollution. The present study intended to determinate the heavy metal concentrations in sediments and the hepatopancreas of the crab species Neohelice granulata as well as the ecological risk through the use of biomarkers and geochemical indices in sites with different anthropogenic pressures of the Bahía Blanca estuary (SW Atlantic Ocean) during the warm and cold season. The results showed low to moderate heavy metal pollution in the sediments by Cu with possible effects on the biota in a site with sewage waters' discharges. Except for GST that was explained by Cd, the biomarkers employed were not useful to assess spatial heavy metal pollution, and they might be ruled out by physiological seasonal variations rather than anthropogenic constraints, or another type of pollutants in the area.

Research paper thumbnail of First approaches to the depuration process of trace metals in the burrowing crab Neohelice granulata from a temperate wetland in South America: Bahía Blanca estuary, Argentina

Environmental Science and Pollution Research, 2020

Trace metal contamination is among the major concerns of stakeholders due to its potential advers... more Trace metal contamination is among the major concerns of stakeholders due to its potential adverse effects on biota and humans, even at low concentrations. Few studies have recently focused on the ability of organisms to depurate trace metals from different tissues. Therefore, we carried out this study to evaluate the bioconcentration of trace metals (Cd, Zn, Pb, Ni, Mn, Fe, Cr, Cu) and the depuration process of these pollutants in two tissues (soft tissue and carapace) in an estuarine benthic crab model, Neohelice granulata. The results indicate that Cu and Zn were the highest bioconcentrated metals in crab tissues, while other metals, such as Pb and Cr, were found in sediments but were not bioconcentrated. On the other hand, Cd was found in crabs but not in sediments. The depuration indicates a total decline in Ni and a significant decrease in Cu and Fe in the soft tissues after the experiment. However, the concentration of the trace metals in the carapace before and after the depuration did not show any significant variation except in the Mn, in which the levels decreased significantly at the end of the depuration. Thus, we recommend continuing to explore metal detoxification in bioindicator species, such as N. granulata, in order to understand the efficiency of the mechanisms of depuration of trace metals.

Research paper thumbnail of Chemical composition and abundance of microplastics in the muscle of commercial shrimp Pleoticus muelleri at an impacted coastal environment (Southwestern Atlantic)

Marine Pollution Bulletin, 2020

Microplastics (plastics < 5 mm) contamination is of worldwide concern and represents a threat to ... more Microplastics (plastics < 5 mm) contamination is of worldwide concern and represents a threat to the environment, biota, and humans. Also, they are potential carriers of other contaminants, increasing their adverse effects. In this study, it was analyzed for the first time the chemical composition and abundance of microplastics (MPs) in the commercial shrimp Pleoticus muelleri. Fibers were the predominant plastics (mean: 1.31 fibers g −1 wet weight) in the abdominal muscle of the shrimps being black, the dominant colour. μ-Raman showed that fibers were composed of polyethylene (PE), polypropylene (PP), and cellulose. Also, weathering and topography of the fibers were analyzed through wide-field confocal microscopy. C, O, Si, Al, K, as well as Fe, Zn, S, Ba, Br, and Ti on the plastic surface were detected with SEM/EDS, indicating potential carriers of contaminants. Capsule: The shrimp Pleoticus muelleri ingests fibers with different chemical elements adsorbed on the plastic surface.

Research paper thumbnail of Uptake and detoxification of trace metals in estuarine crabs: insights into the role of metallothioneins

Environmental Science and Pollution Research, 2020

The detoxification process of trace metals in the estuarine burrowing crab Neohelice granulata, a... more The detoxification process of trace metals in the estuarine burrowing crab Neohelice granulata, after previously being exposed to anthropogenic pressures in the field, is described for the first time. The objectives of this study were (a) to assess the metal content (Cd, Cu, Pb, Zn, Mn, Ni, Cr, Fe) in the sediments and the uptake of these elements in the hepatopancreas of N. granulata; (b) to quantify trace metal concentrations in the hepatopancreas before and after the detoxification experiment; and (c) to relate this information to metallothionein (MT) induction or reversibility. The detoxification assay was performed for 25 days with artificial seawater under controlled conditions in a culture chamber. The results showed higher uptake and bioaccumulation of Zn and Cu from the sediments, and the hepatopancreas exhibited increased levels of Zn and lower concentrations of the rest of the metals and MTs after the assay, mainly Fe and Mn that were significantly lower. We conclude that trace metals could be translocated to and accumulated in the hepatopancreas, the main metabolic organ, and then eliminated under controlled conditions with corresponding reversibility of MTs.

Research paper thumbnail of Fishers' Ecological Knowledge about Marine Pollution: What Can FEK Contribute to Ecological and Conservation Studies of a Southwestern Atlantic Estuary?

Journal of Ethnobiology, 2019

Abstract. The growth of human populations and industrial activities in the last decades have been... more Abstract. The growth of human populations and industrial activities in the last decades have been the major cause of ecosystem decline, especially due to the inputs of several pollutants in the environment. Estuaries are one of the main concerns in marine governance because they receive potentially toxic substances from many sources that end up in the sea. Despite this, marine policies that aim to protect marine areas have dismissed local fishers' knowledge, although fishers have ecological knowledge that endorses and complements scientific research. Therefore, the aim of this study was to identify sources and indicators of pollution in the Bahía Blanca Estuary (BBE) according to the fishers and to contrast this knowledge with scientific studies. We conducted 20 interviews with the fishers of the BBE, and the results showed that all of them think the estuary is polluted and that there have been changes in the biomass of catches in the past. Most of them think that industries of the petrochemical complex are the major cause of pollution (57%), while marine organisms were the most mentioned items as indicators of pollution (59%), especially the commercial species (41%). We found interesting parallels between fishers' ecological knowledge (FEK) and scientific data. Thus, we conclude that FEK is an invaluable tool that provides data that could help to co-protect and co-manage this estuary and the services it provides.

Research paper thumbnail of Microplastics in oysters (Crassostrea gigas) and water at the Bahía Blanca Estuary (Southwestern Atlantic): An emerging issue of global concern

Regional Studies in Marine Science, 2019

Detection of microplastics (MPs) in biotic and abiotic matrices is relevant to evaluate how marin... more Detection of microplastics (MPs) in biotic and abiotic matrices is relevant to evaluate how marine ecosystem's exposure to these pollutants is of emerging environmental concern and at risk of loss of functionality and biodiversity. The presence of MPs was studied for the first time in the gut of benthic oysters (Crassostrea gigas) and in the water column in a eutrophic estuary under high anthropogenic pressure, in the southwestern Atlantic. Significant abundances of small plastic debris were found at all the sampling stations-mainly fibers, fragments, pellets, and beads. MPs were categorized and counted according to type, color, and size. Microfibers presented the highest percentage of abundance in the water column (98% with Van Dorn bottles and 72.73 % with a 60 µm plankton net) as well as in oysters (91%). In water collected with Van Dorn bottles, the total MP concentrations ranged from 5900 to 782,000 particles/m 3 and from 42.6 to 113.6 particles/m 3 in samples collected with a 60 µm plankton net. The widespread presence of fibers in all the assessed components could be related to the intense harbor activities in the area, such as the use of ropes for the mooring of boats and from fishing nets, as well as from domestic and industrial effluents. The presence of MPs in both the pelagic and benthic realms may imply risk for the animals that inhabit the estuary, and for human wellbeing, with respect to the potential transfer of MPs through the food web, affecting the provisioning of ecosystem services.

Research paper thumbnail of Metals in the particulate matter from surf zone waters of a Southwestern Atlantic sandy beach (Monte Hermoso, Argentina)

Regional Studies in Marine Science, 2019

Cd, Cr, Cu and Pb were analyzed for the first time in the suspended particulate matter (SPM) in s... more Cd, Cr, Cu and Pb were analyzed for the first time in the suspended particulate matter (SPM) in surf zone waters of a sandy beach located in the Southwestern Atlantic. The study area corresponds to a recreational sandy seashore beach (Monte Hermoso) where particulate metal levels showed large and irregular fluctuations throughout the study period. The study area is strongly influenced by a humanimpacted estuary located nearby and it is believed that the levels of metals found in the particulate fraction are linked to this human impacted estuary. In particular Cd was found in high concentrations (2.63 µg g −1 dry weight) and therefore it was possible to characterize the SPM with some degree of Cd pollution through EF and I geo index. In addition, sediments were the main component of the SPM during most of the period of study. Finally, the present study provides new insights into the behavior of metals in the SPM in the surf zone, characterized as one of the most productive transitional areas between the continent and the sea, and poorly known from a pollution perspective.

Research paper thumbnail of First record of the fiddler crab Leptuca (=Uca) uruguayensis in the Bahía Blanca Estuary (Buenos Aires, Argentina) with comments on its biology in South America

Regional Studies in Marine Science, 2019

Abstract The occurrence of the fiddler crab Leptuca ( = Uca) uruguayensis (Brachyura: Ocypodidae)... more Abstract The occurrence of the fiddler crab Leptuca ( = Uca) uruguayensis (Brachyura: Ocypodidae) in the Bahia Blanca Estuary (Buenos Aires, Argentina) is reported for the first time. The organisms had a small patchy distribution with high densities in an environment with silty-sandy sediments and low organic matter content, near the population of the dominant varunid crab Neohelice granulata. The presence of this species suggests that larvae of L. uruguayenesis may have been introduced into the estuary via the ballast water of ships. The field sampling was extended to other sites closer to this harbour to assess if the species was inhabiting other places within the estuary, but with no results. Within this framework, the monitoring of this population is fully recommended; moreover, it is necessary to keep monitoring other sites in order to assess if this species could settle in other places in the future.

Research paper thumbnail of Heavy metal concentrations in sediments and in mussels from Argentinean coastal environments, South America

Environmental Earth Sciences, 2018

Among environmental contaminants, heavy metals are currently considered to be some of the most to... more Among environmental contaminants, heavy metals are currently considered to be some of the most toxic ones present worldwide due to their harmful effects on organisms and ability to bioaccumulate in aquatic systems. In this work, the concentration of heavy metals (Cd, Cu, Pb, Zn, Ni and Cr) in Brachidontes rodriguezii and in the fine sediments of several coastal sites at the southwest of Buenos Aires Province, Argentina is analyzed. The Bahía Blanca Estuary and Pehuen-Có beach are located in a highly complex oceanographic and ecological regional system, which creates the basis of one of the most valuable Argentinean habitats for fishing commercial species. An assessment, which involved analyzing distribution pattern of trace metals, comparative studies with sediment and ecological quality guidelines; and a sequential and integrated index analyses approach (containing Metal Pollution Index, Biosediment Accumulation Factor, Geo-accumulation Index (Igeo), Pollution Load Index and the mean Probable Effect Level quotients), was followed to estimate enrichment and risks of heavy metals in the sediments and in the mussels from these study areas. The results showed higher concentrations of some heavy metals (e.g., Cd, Cr and Ni) in mussels collected at Pehuen-Có, while no spatial differences in sediments were observed. According to the international environmental regulations, mean values of trace metals in mussels allowed to place both sites between "unpolluted and moderately polluted" and between the "low and medium category" of pollution. Furthermore, the mean concentrations found were within the detected ranges in other coastal sites worldwide.

Research paper thumbnail of Ephemeral parasitism on blooming diatoms in a temperate estuary

Marine and Freshwater Research, 2017

Parasites of phytoplankton influence phytoplankton bloom dynamics and may severely affect the typ... more Parasites of phytoplankton influence phytoplankton bloom dynamics and may severely affect the type of food available for higher trophic levels. The incidence of parasitic infections generally is expected to increase across ecosystems worldwide under the scenario of global change. Herein we report on a massive parasite infection on two dominant diatoms of the austral winter bloom, namely Thalassiosira pacifica and Chaetoceros diadema, recorded during an extreme precipitation period in the Bahía Blanca Estuary, Argentina. The parasite infection was concomitant with a marked drop in water salinity and affected more than 40% of host cells. Although the parasite on C. diadema was not identified, the parasite on T. pacifica was most likely Pirsonia sp., a nanoflagellate with high host specificity. After the intense rainy period and the parasitic infection, the phytoplankton biomass dropped (by more than 80%) and the community structure shifted to one with smaller species (i.e. Thalassiosi...

Research paper thumbnail of Abundance of microplastics in oysters Crassostrea gigas and water from a highly anthropized estuary

CERN European Organization for Nuclear Research - Zenodo, Nov 17, 2022

Microplastics-MPs-(plastic < 5 mm) have become one of the leading environmental problems due to t... more Microplastics-MPs-(plastic < 5 mm) have become one of the leading environmental problems due to the large amount released into aquatic and terrestrial ecosystems and their possible impacts on organisms and human health. Estuaries are positioned as sinks of MPs, due to the presence of natural and industrial effluents. In Argentina, the Bahía Blanca estuary-BBe-is the second largest estuary in the country and is highly anthropized since it has one of the largest deep ports, the largest petrochemical complex, and urban settlements with untreated sewage waters. The oyster C. gigas is widely used as MPs biomonitoring and is commonly distributed in BBe. This study assesses the concentrations of MPs in surface water and in whole tissue of oysters C. gigas, from the BBe. Two sites of the estuary were sampled, one in the inner zone and the other in the middle area. MPs ranged from 6 to 50 items L-1 in water and from 0 to 2ítems g-1 ww in oyster tissue. There were no significant differences between the water samples and oysters (p > α = 0.25) according to the different sites. Fibers were the most abundant MPs in water and oyster samples, with 78% and 95%, respectively. The color was mainly transparent, followed by blue and black. Regarding the size in water, the MPs < 0.5 mm represented 50%, followed by particles between 1 and 5 mm with 36%. In oysters, MPs between 1 and 5 mm were 48%. Many fibers could originate from the mechanical degradation of clothing textiles and hygiene products that enter the aquatic environment through sewage. Due to the ubiquitous nature of MPs in the environment and their different effects on organisms, studies of this kind represent the basis for implementing sustained monitoring of MPs in water, sediments, and biota.

Research paper thumbnail of Microplastics in commercial seafood: Pleoticus muelleri as a case study in an estuarine environment highly affected by human pressure (Southwestern Atlantic)

Research paper thumbnail of Heavy metals in the Bahia Blanca estuary and its relation with metallothioneins levels in neohelice granulata

En el Estuario de Bahía Blanca se ubican varios puertos, ciudades y uno de los complejos industri... more En el Estuario de Bahía Blanca se ubican varios puertos, ciudades y uno de los complejos industriales más grandes de Sudamérica. En el presente trabajo se analizó la concentración de metales pesados en los sedimentos y en el material particulado en suspensión (MPS) y su relación con los niveles de metalotioneínas (MTs) en el cangrejo Neohelice granulata de dos sitios del estuario sometidos a diferente impacto antrópico. Los metales pesados luego de la digestión de la muestra en medio ácido, fueron leídos mediante ICP-OES y las MTs fueron determinadas por espectrometría UV-visible. Se encontraron diferencias altamente significativas en el contenido de MTs entre ambos sitios y entre cangrejos machos y hembras. Esto posiblemente se deba por un lado al distinto impacto antrópico recibido en cada sitio reflejado a su vez en la concentración de metales pesados en sedimentos y MPS; y naturalmente por el sexo.Centro de Investigaciones Geológica

Research paper thumbnail of Lucha de titanes, neohelice granulata vs. cyrtograpsus angulatus ¿cuál es el mejor bioindicador de metales pesados? : un estudio comparativo en una zona interna del Estuario de Bahía Blanca

El Estuario de Bahía Blanca es un humedal localizado en el sudoeste de la costa bonaerense, que p... more El Estuario de Bahía Blanca es un humedal localizado en el sudoeste de la costa bonaerense, que posee un clima templado perteneciente a la ecorregión patagónica. El aporte de agua dulce proveniente de ríos es escaso en comparación a otros grandes estuarios como el de La Plata y se ha configurado en una región única de mayores ingresiones marinas. Para referirse a este ambiente, se ha acuñado el término “ría" que emerge como una construcción social de los pobladores que refieren a este humedal de transición con contribuciones de pequeños arroyos o riachos. La presión antrópica histórica sobre el estuario basado en las actividades extractivas, lo han convertido en un escenario ecológicamente sacrificable para muchas especies animales y socialmente vaciable para quienes desarrollan sus pequeñas economías en este humedal. Por tanto, es interesante analizar las condiciones ecológicas de este ecosistema desde una perspectiva integral, considerando los organismos que habitan en relaci...

Research paper thumbnail of Tracking Synthetic Microdebris Contamination in a Highly Urbanized Estuary Through Crabs as Sentinel Species: An Ecological Trait-Based Approach

SSRN Electronic Journal, 2022

Research paper thumbnail of Environmental quality assessment by multiple biogeochemical indicators of an intertidal flat under anthropogenic influence from the southwest of Buenos Aires (Argentina)

Environmental Earth Sciences, 2021

Chemical measures combined with biological data (biomarkers) are recommended in monitoring progra... more Chemical measures combined with biological data (biomarkers) are recommended in monitoring programs of marine environments. In the present research, the use of multiples biogeochemical indicators allowed interrelating different environmental measurements to deepen the knowledge of the quality/status of the intertidal flat from Puerto Rosales (Bahía Blanca estuary, Argentina) subjected to anthropogenic pressure. The sediments from this site presented a eutrophic status and high organic matter concentration with high nutritional value for the benthic community. The TPR/TCH ratio (~ 10) would evidence the untreated sewage discharge contribution and increments in protein content due to the complexation of nitrogen during phytodetritus accumulation and degradation. Trace metals levels in the fine sediments were lower than those recommended by international guides for uncontaminated sites. In the sediments, except Cu, all metals analyzed were rarely associated with adverse biological effects. Finally, metallothioneins levels in the burrowing crab Neohelice granulata were lower than those found in the literature and significantly higher in females than in males. Even though the different analyses and indices performed indicate that this intertidal flat is in good environmental condition, the wastewater discharge influenced it. Thus, it is advisable to continue with this kind of study by applying multi-combined proxies in this and other impacted tidal flats.

Research paper thumbnail of Biomonitoreo para la evaluación de metales pesados en sedimentos del estuario de Bahía Blanca bajo impacto antrópico

Research paper thumbnail of Microplastics and suspended particles in a strongly impacted coastal environment: Composition, abundance, surface texture, and interaction with metal ions

Science of The Total Environment, 2021

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Research paper thumbnail of A “new normality” for small-scale artisanal Fishers? The case of unregulated fisheries during the COVID-19 pandemic in the Bahía Blanca estuary (SW Atlantic Ocean)

Ocean & Coastal Management, 2021

Abstract The current COVID-19 pandemic is causing health and economic crises worldwide, but conse... more Abstract The current COVID-19 pandemic is causing health and economic crises worldwide, but consequences are worse for those emerging countries with poor sanitary conditions struggling against economic recessions. Small-scale artisanal fishers (SSAF) should be considered among the “essential workers” since they provide food services; however, the COVID-19 might have altered the normal livelihood and reduced people economic incomes in an already marginalized sector. This situation highlights the fishers' vulnerability, derived from changes in fish stocks caused by climate change, pollution, overharvesting, and informal work (illegal, unreported and unregulated fishing). Therefore, the so-called “new normality” raises big questions about the management of coastal areas and fisheries in developing countries. As a study case, we proposed exploring SSAF from an Argentinian estuary, the Bahia Blanca estuary (SW Atlantic Ocean). Most of them are unregulated after a reconversion program carried out by the local government in 2012. After reviewing the current COVID-19 legislation for coastal fisheries and having virtual encounters with SSAF, we observed they are struggling against the economic crisis caused by the pandemic. According to our observations, imperative measures must be taken to prevent fisheries collapse in the area. In this work, we present a reference point for the post-pandemic management of fisheries that could be considered for emerging public policies.

Research paper thumbnail of COVID-19 pandemic repercussions on plastic and antiviral polymeric textile causing pollution on beaches and coasts of South America

Science of The Total Environment, 2021

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Research paper thumbnail of Integrative assessment of the ecological risk of heavy metals in a South American estuary under human pressures

Ecotoxicology and Environmental Safety, 2021

Biomonitoring of heavy metal pollution through the use of biomarkers could be a difficult task si... more Biomonitoring of heavy metal pollution through the use of biomarkers could be a difficult task since the organisms' physiological changes could shift regarding natural factors (i.e., the season of the year) and due to the anthropogenic pressures of the environment. In the Southwest Atlantic Ocean, where most industrial and developing countries are settled, it is essential to address these concerns to generate information for the stakeholders and monitoring programs that aim to use biochemical biomarkers as early warning signals to detect heavy metal pollution. The present study intended to determinate the heavy metal concentrations in sediments and the hepatopancreas of the crab species Neohelice granulata as well as the ecological risk through the use of biomarkers and geochemical indices in sites with different anthropogenic pressures of the Bahía Blanca estuary (SW Atlantic Ocean) during the warm and cold season. The results showed low to moderate heavy metal pollution in the sediments by Cu with possible effects on the biota in a site with sewage waters' discharges. Except for GST that was explained by Cd, the biomarkers employed were not useful to assess spatial heavy metal pollution, and they might be ruled out by physiological seasonal variations rather than anthropogenic constraints, or another type of pollutants in the area.

Research paper thumbnail of First approaches to the depuration process of trace metals in the burrowing crab Neohelice granulata from a temperate wetland in South America: Bahía Blanca estuary, Argentina

Environmental Science and Pollution Research, 2020

Trace metal contamination is among the major concerns of stakeholders due to its potential advers... more Trace metal contamination is among the major concerns of stakeholders due to its potential adverse effects on biota and humans, even at low concentrations. Few studies have recently focused on the ability of organisms to depurate trace metals from different tissues. Therefore, we carried out this study to evaluate the bioconcentration of trace metals (Cd, Zn, Pb, Ni, Mn, Fe, Cr, Cu) and the depuration process of these pollutants in two tissues (soft tissue and carapace) in an estuarine benthic crab model, Neohelice granulata. The results indicate that Cu and Zn were the highest bioconcentrated metals in crab tissues, while other metals, such as Pb and Cr, were found in sediments but were not bioconcentrated. On the other hand, Cd was found in crabs but not in sediments. The depuration indicates a total decline in Ni and a significant decrease in Cu and Fe in the soft tissues after the experiment. However, the concentration of the trace metals in the carapace before and after the depuration did not show any significant variation except in the Mn, in which the levels decreased significantly at the end of the depuration. Thus, we recommend continuing to explore metal detoxification in bioindicator species, such as N. granulata, in order to understand the efficiency of the mechanisms of depuration of trace metals.

Research paper thumbnail of Chemical composition and abundance of microplastics in the muscle of commercial shrimp Pleoticus muelleri at an impacted coastal environment (Southwestern Atlantic)

Marine Pollution Bulletin, 2020

Microplastics (plastics < 5 mm) contamination is of worldwide concern and represents a threat to ... more Microplastics (plastics < 5 mm) contamination is of worldwide concern and represents a threat to the environment, biota, and humans. Also, they are potential carriers of other contaminants, increasing their adverse effects. In this study, it was analyzed for the first time the chemical composition and abundance of microplastics (MPs) in the commercial shrimp Pleoticus muelleri. Fibers were the predominant plastics (mean: 1.31 fibers g −1 wet weight) in the abdominal muscle of the shrimps being black, the dominant colour. μ-Raman showed that fibers were composed of polyethylene (PE), polypropylene (PP), and cellulose. Also, weathering and topography of the fibers were analyzed through wide-field confocal microscopy. C, O, Si, Al, K, as well as Fe, Zn, S, Ba, Br, and Ti on the plastic surface were detected with SEM/EDS, indicating potential carriers of contaminants. Capsule: The shrimp Pleoticus muelleri ingests fibers with different chemical elements adsorbed on the plastic surface.

Research paper thumbnail of Uptake and detoxification of trace metals in estuarine crabs: insights into the role of metallothioneins

Environmental Science and Pollution Research, 2020

The detoxification process of trace metals in the estuarine burrowing crab Neohelice granulata, a... more The detoxification process of trace metals in the estuarine burrowing crab Neohelice granulata, after previously being exposed to anthropogenic pressures in the field, is described for the first time. The objectives of this study were (a) to assess the metal content (Cd, Cu, Pb, Zn, Mn, Ni, Cr, Fe) in the sediments and the uptake of these elements in the hepatopancreas of N. granulata; (b) to quantify trace metal concentrations in the hepatopancreas before and after the detoxification experiment; and (c) to relate this information to metallothionein (MT) induction or reversibility. The detoxification assay was performed for 25 days with artificial seawater under controlled conditions in a culture chamber. The results showed higher uptake and bioaccumulation of Zn and Cu from the sediments, and the hepatopancreas exhibited increased levels of Zn and lower concentrations of the rest of the metals and MTs after the assay, mainly Fe and Mn that were significantly lower. We conclude that trace metals could be translocated to and accumulated in the hepatopancreas, the main metabolic organ, and then eliminated under controlled conditions with corresponding reversibility of MTs.

Research paper thumbnail of Fishers' Ecological Knowledge about Marine Pollution: What Can FEK Contribute to Ecological and Conservation Studies of a Southwestern Atlantic Estuary?

Journal of Ethnobiology, 2019

Abstract. The growth of human populations and industrial activities in the last decades have been... more Abstract. The growth of human populations and industrial activities in the last decades have been the major cause of ecosystem decline, especially due to the inputs of several pollutants in the environment. Estuaries are one of the main concerns in marine governance because they receive potentially toxic substances from many sources that end up in the sea. Despite this, marine policies that aim to protect marine areas have dismissed local fishers' knowledge, although fishers have ecological knowledge that endorses and complements scientific research. Therefore, the aim of this study was to identify sources and indicators of pollution in the Bahía Blanca Estuary (BBE) according to the fishers and to contrast this knowledge with scientific studies. We conducted 20 interviews with the fishers of the BBE, and the results showed that all of them think the estuary is polluted and that there have been changes in the biomass of catches in the past. Most of them think that industries of the petrochemical complex are the major cause of pollution (57%), while marine organisms were the most mentioned items as indicators of pollution (59%), especially the commercial species (41%). We found interesting parallels between fishers' ecological knowledge (FEK) and scientific data. Thus, we conclude that FEK is an invaluable tool that provides data that could help to co-protect and co-manage this estuary and the services it provides.

Research paper thumbnail of Microplastics in oysters (Crassostrea gigas) and water at the Bahía Blanca Estuary (Southwestern Atlantic): An emerging issue of global concern

Regional Studies in Marine Science, 2019

Detection of microplastics (MPs) in biotic and abiotic matrices is relevant to evaluate how marin... more Detection of microplastics (MPs) in biotic and abiotic matrices is relevant to evaluate how marine ecosystem's exposure to these pollutants is of emerging environmental concern and at risk of loss of functionality and biodiversity. The presence of MPs was studied for the first time in the gut of benthic oysters (Crassostrea gigas) and in the water column in a eutrophic estuary under high anthropogenic pressure, in the southwestern Atlantic. Significant abundances of small plastic debris were found at all the sampling stations-mainly fibers, fragments, pellets, and beads. MPs were categorized and counted according to type, color, and size. Microfibers presented the highest percentage of abundance in the water column (98% with Van Dorn bottles and 72.73 % with a 60 µm plankton net) as well as in oysters (91%). In water collected with Van Dorn bottles, the total MP concentrations ranged from 5900 to 782,000 particles/m 3 and from 42.6 to 113.6 particles/m 3 in samples collected with a 60 µm plankton net. The widespread presence of fibers in all the assessed components could be related to the intense harbor activities in the area, such as the use of ropes for the mooring of boats and from fishing nets, as well as from domestic and industrial effluents. The presence of MPs in both the pelagic and benthic realms may imply risk for the animals that inhabit the estuary, and for human wellbeing, with respect to the potential transfer of MPs through the food web, affecting the provisioning of ecosystem services.

Research paper thumbnail of Metals in the particulate matter from surf zone waters of a Southwestern Atlantic sandy beach (Monte Hermoso, Argentina)

Regional Studies in Marine Science, 2019

Cd, Cr, Cu and Pb were analyzed for the first time in the suspended particulate matter (SPM) in s... more Cd, Cr, Cu and Pb were analyzed for the first time in the suspended particulate matter (SPM) in surf zone waters of a sandy beach located in the Southwestern Atlantic. The study area corresponds to a recreational sandy seashore beach (Monte Hermoso) where particulate metal levels showed large and irregular fluctuations throughout the study period. The study area is strongly influenced by a humanimpacted estuary located nearby and it is believed that the levels of metals found in the particulate fraction are linked to this human impacted estuary. In particular Cd was found in high concentrations (2.63 µg g −1 dry weight) and therefore it was possible to characterize the SPM with some degree of Cd pollution through EF and I geo index. In addition, sediments were the main component of the SPM during most of the period of study. Finally, the present study provides new insights into the behavior of metals in the SPM in the surf zone, characterized as one of the most productive transitional areas between the continent and the sea, and poorly known from a pollution perspective.

Research paper thumbnail of First record of the fiddler crab Leptuca (=Uca) uruguayensis in the Bahía Blanca Estuary (Buenos Aires, Argentina) with comments on its biology in South America

Regional Studies in Marine Science, 2019

Abstract The occurrence of the fiddler crab Leptuca ( = Uca) uruguayensis (Brachyura: Ocypodidae)... more Abstract The occurrence of the fiddler crab Leptuca ( = Uca) uruguayensis (Brachyura: Ocypodidae) in the Bahia Blanca Estuary (Buenos Aires, Argentina) is reported for the first time. The organisms had a small patchy distribution with high densities in an environment with silty-sandy sediments and low organic matter content, near the population of the dominant varunid crab Neohelice granulata. The presence of this species suggests that larvae of L. uruguayenesis may have been introduced into the estuary via the ballast water of ships. The field sampling was extended to other sites closer to this harbour to assess if the species was inhabiting other places within the estuary, but with no results. Within this framework, the monitoring of this population is fully recommended; moreover, it is necessary to keep monitoring other sites in order to assess if this species could settle in other places in the future.

Research paper thumbnail of Heavy metal concentrations in sediments and in mussels from Argentinean coastal environments, South America

Environmental Earth Sciences, 2018

Among environmental contaminants, heavy metals are currently considered to be some of the most to... more Among environmental contaminants, heavy metals are currently considered to be some of the most toxic ones present worldwide due to their harmful effects on organisms and ability to bioaccumulate in aquatic systems. In this work, the concentration of heavy metals (Cd, Cu, Pb, Zn, Ni and Cr) in Brachidontes rodriguezii and in the fine sediments of several coastal sites at the southwest of Buenos Aires Province, Argentina is analyzed. The Bahía Blanca Estuary and Pehuen-Có beach are located in a highly complex oceanographic and ecological regional system, which creates the basis of one of the most valuable Argentinean habitats for fishing commercial species. An assessment, which involved analyzing distribution pattern of trace metals, comparative studies with sediment and ecological quality guidelines; and a sequential and integrated index analyses approach (containing Metal Pollution Index, Biosediment Accumulation Factor, Geo-accumulation Index (Igeo), Pollution Load Index and the mean Probable Effect Level quotients), was followed to estimate enrichment and risks of heavy metals in the sediments and in the mussels from these study areas. The results showed higher concentrations of some heavy metals (e.g., Cd, Cr and Ni) in mussels collected at Pehuen-Có, while no spatial differences in sediments were observed. According to the international environmental regulations, mean values of trace metals in mussels allowed to place both sites between "unpolluted and moderately polluted" and between the "low and medium category" of pollution. Furthermore, the mean concentrations found were within the detected ranges in other coastal sites worldwide.

Research paper thumbnail of Ephemeral parasitism on blooming diatoms in a temperate estuary

Marine and Freshwater Research, 2017

Parasites of phytoplankton influence phytoplankton bloom dynamics and may severely affect the typ... more Parasites of phytoplankton influence phytoplankton bloom dynamics and may severely affect the type of food available for higher trophic levels. The incidence of parasitic infections generally is expected to increase across ecosystems worldwide under the scenario of global change. Herein we report on a massive parasite infection on two dominant diatoms of the austral winter bloom, namely Thalassiosira pacifica and Chaetoceros diadema, recorded during an extreme precipitation period in the Bahía Blanca Estuary, Argentina. The parasite infection was concomitant with a marked drop in water salinity and affected more than 40% of host cells. Although the parasite on C. diadema was not identified, the parasite on T. pacifica was most likely Pirsonia sp., a nanoflagellate with high host specificity. After the intense rainy period and the parasitic infection, the phytoplankton biomass dropped (by more than 80%) and the community structure shifted to one with smaller species (i.e. Thalassiosi...