Marcela Silvia Gerpe

Marcela Silvia Gerpe
Universidad Nacional de Mar del Plata | UNMDP · Departamento de Ciencias Marinas

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25
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Publications

Publications (25)
Article
Full-text available
Levels of zinc (Zn), copper (Cu), potassium (K), calcium (Ca), magnesium (Mg), and phosphorus (P) in plasma of Otaria flavescens females (n = 29) were evaluated. Reference intervals were established for each element, being the first report for this species.
Article
Full-text available
Metallothioneins are signals of metal exposure and widely used in biomonitoring. Franciscana dolphin is an endemic cetacean from the Southwestern Atlantic Ocean, classified as Vulnerable A3d by the IUCN. Metallothionein, copper and zinc in Franciscana were assessed in two geographic groups; one inhabits La Plata River estuary, anthropogenically imp...
Article
Full-text available
In the present study, the acute toxicity of cadmium (Cd) in white shrimp (Palaemonetes argentinus) from a metal polluted lagoon (Los Padres, LP) and from unpolluted lagoon (Nahuel Ruca, NR) was evaluated. Both population, were exposed to 3.06, 12.26, 30.66, 61.32, 306 and 613.2μg Cd·L(-1) for 96-h. The sublethal effects of Cd were examined by two c...
Article
We evaluated the presence of four common microcystins (MC–LR, –RR, –YR and –LA) in water samples and tissues (liver and muscle) of Odontesthes bonariensis collected in Los Padres Lake (Argentina). MCs were quantified by HPLC–ESI-MS/MS. The total content of MCs in water samples (2.8 ± 5.6 μg L−1) and in O. bonariensis muscle (3.9 ± 2.2 μg kg−1) neve...
Article
Full-text available
Patagonian and Fueguian salt marshes extend from 39 to 55ºS with different tidal and climatic effects. These effects conditioned their behaviour, and remote sensing is a useful tool to analyse these latitudinal trends, being the Normalized Difference Vegetation Index (NDVI) the most common parameter recommended. One of the most difficult issue is t...
Article
Full-text available
In marine mammals, the transition period between lactation and independent feeding provides an opportunity to evaluate the influence of the first solid food on heavy metal concentrations in their tissues at early stages of their life cycle. The aim of the present study was to compare mercury, cadmium, zinc and copper levels in lactating and recentl...
Article
Full-text available
Copper, zinc, mercury, and cadmium were studied in the muscle, liver, and kidney of three adults and one juvenile Southern sea lion (Otaria flavescens) found dead on the beaches of Argentina. Heavy metal concentrations were determined by Atomic Absorption Spectrophotometry; cold vapor and air/acetylene flame techniques were applied for mercury and...
Chapter
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Marine mammals accumulate heavy metals in their tissues and organs, and diet is the major intake of contaminants in these top predators. In the present study, heavy metal analyses were performed in muscle, liver, and kidney of three adults and one juvenile southern sea lion of both sexes (1.2-2.3 m) found dead on beaches of northern Argentina. We s...
Article
Full-text available
Marine mammals accumulate heavy metals in their tissues at different concentrations according to trophic levels and environmental conditions. The franciscana (Pontoporia blainvillei) is a small coastal species inhabiting the marine and estuarine areas of the Southwestern Atlantic Ocean. Its diet includes numerous species of small fish, squid and cr...
Article
 The levels and burdens of Cd, Zn, Cu and Hg were measured in the dorsal mantle, digestive gland and gonads of the squid Illex argentinus, from the Southwest Atlantic Ocean. Mature and immature individuals of both sexes were analysed. Correlations of heavy metal concentrations and burdens with sex and food habits were studied. The highest metal lev...
Article
In this study, we haveexamined the basallevel expression and tissue-specificexpressionpatternsof metallothionein (MT) in Arctic char following metal and E2 (17β-estradiol) treatment. To study the gene regulation in Arctic char, the two MT isoforms were isolated from a lambda-ZAP hepatic cDNA library and characterized. Determination of basal MT mRNA...
Article
Full-text available
procesos relacionados con el metabolismo de los mismos. Comparando con otros grupos marinos, los mamíferos y en especial los cetáceos, han sido escasamente estudiados, muy probablemente debido a restricciones en cuanto a la accesibilidad de muestras. Pontoporia blainvillei es una especie con características particulares para el estudio de metales p...
Article
The effects of injections of 17β-estradiol (E2) and Cd, on the distribution of Cd and the induction of metallothionein (MT) mRNA and vitellogenin mRNA was investigated. Bone and liver were the main organs accumulating Cd. However, E2 redirected the metal accumulation from the bone and liver to the gill, gut and muscle upon exposure to E2. Cd did no...
Article
Full length sequences of two Arctic char (Salvelinus alpinus) metallothionein (MT) cDNAs, corresponding to MT-A and MT-B, were isolated from a λ-ZAP hepatic cDNA library. The two MT isoforms showed high similarity to rainbow trout and Atlantic salmon MT, with the coding sequences being 100% homologous to rainbow trout MT. Following characterization...
Article
General condition, biochemical composition changes and fatty acids in several tissues of I. argentinus at different sexual stages were studied. Ovarian maturation involves a simultaneous increase in ovary mass and in protein and lipid levels. Testes weights were modified less than the ovary with maturation and showed a constant biochemical composit...
Article
 To evaluate levels of essential (zinc and copper) and non-essential (mercury and cadmium) heavy metals, 34 species of organisms from different areas close to the Antarctic Peninsula were analysed. These included algae, filter-feeders, omnivorous invertebrates and vertebrates. Mercury was not detected, while cadmium was found in the majority of org...
Article
Environmental contamination become an increasing global problem. Different scientific strategies have been developed in order to assess the impact of pollutants on marine ecosystems. The distribution of toxic contaminants in tissues of different marine mammal species--both cetaceans and pinnipeds--has been studied in many ecosystems, as well as sev...
Article
Tissue distribution of heavy metals (total mercury, cadmium, zinc and copper) were studied in specimens of Bottlenose Dolphin (Tursiops gephyreus), Franciscana Dolphin (Pontoporia blainvillei) and Pigmy Sperm Whale (Kogia breviceps) stranded in SW Atlantic beaches in Argentina. Heavy metal determinations were carried out by atomic absorption spectr...

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