FRCH - I+D+i - GIDTAP::Artículos en revistas
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Item PAHs contamination in edible gastropods from north Patagonian harbor areas(2018-08-10) Primost, Mónica A.; Commendatore, Marta Graciela; Torres, Pablo Javier; Bigatti, GregorioPAHs are persistent pollutants released into the environment by fossil fuels burning and leak during petroleum operations. Associated with suspended particles upon entering marine ecosystem are accumulated by benthic fauna. Human exposure occurs mainly from ingestion such as gastropods consumption. The objective was to determine PAHs in sediments and in the marine gastropod Buccinanops globulosus in sites with different maritime and urban influences. In sampling sites located 20 km from the harbor, PAHs were non-detected; while in harbor gastropods, the level of PAH4 was exceeded according to international normative. Level of dibenzo[a,h]anthracene in sediments was between the ISQG and PEL. Since these are the first results of PAHs in edible gastropods in South America, we concluded that PAHs can be dangerous for consumers according to ingestion frequency. Integrative studies are necessary to evaluate the interaction among pollutants in maritime areas and the incidence in human health due to shellfish consumption.Item Photosensitizing role of R-phycoerythrin red protein and ß-carboline alkaloids in Dye sensitized solar cell. Electrochemical and spectroscopic characterization(2019-11-13) Yañuk, Juan G.; Cabrerizo, Franco M.; Dellatorre, Fernando Gaspar; Cerdá, María F.Dye-sensitized solar cell (DSSC) technology represents a valuable source for renewable energy production. Although with a rather low conversion efficiency, the continuous improvement of the price/performance ratio is making this technology more competitive than other sources of electrical power generation. To date, one of the major challenges is the search of novel and low-cost photosensitizers, a key player in the overall photo-conversion process. Natural dyes have shown to be an excellent alternative that still needs to be further explored. In this work, the spectroscopic and electrochemical properties of two different families of naturally occurring pigments (i.e, ß-carboline alkaloids (ßCs) and the red protein R-phycoerythrin (R-PE)) as well as their role in DSSCs are addressed. DSSC assemblies show that R-PE represents a highly suitable photosensitizer showing quite a high stability with a relative high solar energy to electricity conversion efficiency (n=0.11%) when comparing with other recombinant proteins (n=0.30%). Algae extracts used without further purification showed herein the highest efficiencies. The latter fact has a concomitant positive effect on the overall production cost of these photovoltaic cells. Surprisingly, and despite their positive effect on the coating of the semiconductor surface, the use of ßCs as additive decreases the overall conversion efficiency of the R-PE based DSSCs evaluated. Data support the hypothesis these alkaloids would be blocking the incident UVB/UVA radiation.Item RXR expression in marine gastropods with different sensitivity to imposex development(Nature, 2020-06-11) Giulianelli, Sebastián; Primost, Mónica A.; Lanari, Claudia; Bigatti, GregorioThe superposition of male sexual characteristics in female marine gastropods (imposex) represents one of the clearest ecological examples of organotin-mediated endocrine disruption. Recent evidences suggest that signaling pathways mediated by members of the nuclear receptor superfamily, RXR and PPARγ, are involved in the development of this pseudohermaphroditic condition. Here, we identifed signifcant diferences in RXR expression in two caenogastropod species from Nuevo Gulf, Argentina, Buccinanops globulosus and Trophon geversianus, which present clear contrast in imposex incidence. In addition, B. globulosus males from a polluted and an unpolluted area showed diferences in RXR expression. Conversely, PPARγ levels were similar between both analyzed species. These fndings indicate specie-specifc RXR and PPARγ expression, suggesting a major role of RXR in the induction of imposex.Item Embryonic shell shape as an early indicator of pollution in marine gastropods(2021-02-19) Primost, Mónica A.; Averbuj, Andrés; Bigatti, Gregorio; Márquez, FedericoGastropods shell shape has been proposed as a good indicator of environmental changes while geometric morphometric (GM) is a powerful tool to detect such changes. Shell shape pattern in adults of the marine gastropod Buccinanops deformis was proved to be correlated with imposex incidence and maritime traffic in populations of Patagonia. We explore through GM the shell shape variation of B. deformis intracapsular embryos in pre-hatching stages of development, in two populations with contrasting maritime traffic and imposex incidence. Embryonic shell shape from polluted and unpolluted areas was significantly different in apex, lateral, aperture and siphonal channel. The same shell shape pattern was observed previously in B. deformis adult specimens. Our results demonstrate that the embryonic shell shape is an early biomarker that could be used as a tool to detect the response to environmental pollution studying abundant egg capsules laid in the field but protecting reproductive adults.Item Surfing the tide: homeward migration of sea trout (Salmo trutta) in a Patagonian river(The Fisheries Society of the British Isles, 2022-06-23) Giese, Adriana Carolina; García Asorey, Martín Ignacio; Casalinuovo, Miguel Ángel; Amaya Santi, María Marcela; Kennedy, Brian Patrick; Pascual, Miguel AlbertoThis study evaluates the influence of marine and freshwater conditions on the timing of river entry and upstream migration of sea trout (Salmo trutta) in the Grande River of Tierra del Fuego, Patagonia. We analysed the in-river catch-and-release records from a group of fishing lodges that dominate the Grande River fishery during January–April 2008 (n = 5029 fish) as a function of environmental variables: tidal amplitude, stage in the lunar cycle, river discharge, and river water temperature along the homeward migration season. We discuss the value of the daily catch rate as an abundance index in the Grande river, then analyse the temporal structure of the tidal cycle in the Grande River estuary, a macro-tidal environment with a mean tidal amplitude of 5.7 m, and analyse the fit of a generalized additive model to trout catches on a daily basis in four sections along the river to identify the environmental variables that may affect trout abundance throughout the homeward migration. Fish catches in each section of the river were differentially affected by specific environmental variables: tidal amplitude had a positive and significant effect on catches in the lower river sections, whereas water temperature and river discharge significantly affected catches in upper sections (positive effect of temperature; negative effect of discharge). Catches in the lower section clearly reflect the river entry stage of the homeward migration, with a bi-modal shape significantly correlated with the tidal cycle. The first peak was composed mainly of larger multi-sea-winter trout that move upstream, whereas the second one had a wider range of fish lengths, including a large proportion of small and maybe nonreproductive trout that overwinter in the lower river. Based on our results, we conclude that the large tides in the Grande River estuary strongly affect the river entry timing of sea trout. The underlying mechanisms of this effect may be a combination of increased olfactory recognition and increased tidal transport modulated by the seasonal tidal cycle, which operates on trout during coastal migration to produce the pulses observed in the Grande River sea trout run. In the middle and upper sections of the river, where the tidal effect at river entry was dissipated as upstream migration progressed, trout catches increased with water temperature and decreased with river discharge, which may operate through their influence on in-river migration rate and abundance, but also through changes in catchability.Item Seaweed resources of Argentina (S W Atlantic) : production, bio-ecological, applied research and challenges for sustainable development(British Phycological Society, 2022-10-13) Raffo, María Paula; Dellatorre, Fernando Gaspar; Ciancia, MarinaArgentina comprises more than 5000 km of coastline with a considerable diversity of seaweeds, some of which have the potential to be transformed into fishery resources. However, when compared with other marine resources, the exploitation of the seaweed species in terms of the harvesting methods, their sustainability and available information on biological and ecological features, as well as their potential applications, is scarce or outdated. In this context, this review includes an integrated analysis of production statistics of selected seaweeds in Argentina. In addition, an extensive revision of taxonomic, bio-ecological, environmental and applied issues involving Argentinean seaweed resources is provided. Furthermore, we include novel information about the changes in resource availability which occurred during the last 20 years and their consequent impacts on the seaweed industry. The Argentinean seaweed industry developed raw materials biomass production in the 1960s and extraction of phycocolloids in the 1970s which dropped to very low levels to the present. Information here presented contributes directly to the UN SDG Goal 14: Life below water, providing a theoretical framework to understand how and which of the global change drivers affect sustainability of marine resources. Additionally, a detailed review is presented on phycocolloids from Argentinean seaweed resources. Actions are proposed that would contribute to the enhanced sustainable development in Argentina. The review suggests that reactivation of an Argentinean seaweed industry requires an update of legal frameworks, regarding exploitation of Argentinean seaweeds together with the necessary developments of science and industry.Item Press, pulse, and perceptions : how does media attention signal perceptions about environmental crises?(Policy Studies Organization, 2023-01-23) Olivier, Tomás; Bell, Emily V.; García Asorey, Martín Ignacio; Rodas Gaiter, AlejandraAt what point do environmental phenomena become crises, and how do these impact the quantity and quality of media attention? As climate patterns change, societies face crises that are slow-moving in nature (such as sea level rise and drought) or fast-changing (such as hurricanes or flash floods). A third type of event is those that are slow-occurring while at the same time being punctuated by extreme, fast-changing occurrences. The practical and theoretical consequences of these complex events are often difficult to pinpoint. We argue that it is necessary to evaluate how the features of such events affect stakeholder perceptions. We do so by analyzing water-quality crises in Northeastern Patagonia, Argentina. Combining turbidity data collected over a decade with 10 years of newspaper articles published in response to high turbidity events, we assess the extent and sentiment of media attention to better understand the linkage between extreme natural events and how these relate to the media agenda. We find that as events increase in duration and intensity, their media coverage increases. These effects are more accentuated when the duration and intensity of an event surpass limits imposed by local infrastructure and practices.Item Changes on quality parameters and sensory attributes of the Patagonian red octopus (Enteroctopus megalocyathus) meat under diff erent postharvest treatments(2024) Dima, Jimena; Fiedorowicz Kowal, Martina Victoria; Castañeda, Jorge; Ortíz, NicolásEnteroctopus megalocyathus is an important commercial resource harvested by small-scale fi sheries from Argentina and Chile, with limited access to cooling preservation methods. In this sense, the use of alternative postharvest conservation methods could be useful to preserve the good quality of the raw product. The eff ect of postharvest treatments using seawater immersion, fl aked ice, 0.1% acetic acid, and a control was investigated on raw octopus during storage at 4 °C for seven days. Under these treatments, changes in physical, chemical, microbiological parameters and sensory attributes were evaluated. Results showed that for control and seawater treatments, octopus became unacceptable at the third day. Ice and 0.1% acetic acid treatments exhibited better physical, chemical and microbiological quality parameters along the storage days. Based on sensory attributes, octopus meat immersed in 0.1% acetic acid remained within the limits of acceptability until the fi fth day, while the ice treatment extended the initial quality at least for seven days. Thus, 0.1% acetic acid would become an economical and easily applicable method during postharvest handling of E. megalocyathus fi shery.Item Wolbachia-density variation in weevils of the tribe Naupactini (Coleoptera, Curculionidae)(2024-01-20) da Cruz Cabral, Lucía Mariana; Fernandez Goya, Lucía; Piccinali, Romina V.; Lanteri, Analía; Confalonieri, Viviana A.; Rodriguero, Marcela S.The intracellular bacteria Wolbachia pipientis infects arthropods and filarial nematodes and is able to manipulate host reproduction. It has been reported an association between parthenogenesis and Wolbachia infection in weevils from the tribe Naupactini. A curing experiment suggested that a threshold density of Wolbachia is required for parthenogenetic reproduction to occur. The aim of this study was to analyze Wolbachia infection status and density in two sexually reproducing species from the tribe Naupactini, Naupactus xanthographus and Naupactus dissimulator. Wolbachia infection was detected in individuals from both species in several geographic locations, not being fixed. Quantification through real time PCR confirmed that Wolbachia loads in sexual species were significantly lower than in parthenogenetic ones; these results support the hypothesis of a threshold level for parthenogenetic reproduction to occur in Naupactini weevils. Strain typing showed that both sexual species carry wNau1, the most frequent strain in parthenogenetic Naupactini weevils. In addition, the presence of the WO phage, which might be an important factor regulating infection density in some hosts, was detected in this strain. Finally, Wolbachia wNau1 was located throughout the whole insect body, which is in agreement with the idea of a recent acquisition by horizontal transfer of wNau1 across the tribe Naupactini.