In recent years, trace elements in cow milk have been considered good bioindicators of pollution in the agricultural environment. The aim of the study was to analyze the correlation between trace element content in livestock drinking water and cow milk from dairy farms located in the southeast of Córdoba province, Argentina. Groundwater is the main source of livestock drinking water. According to the results, trace elements were grouped in three categories: (a) those that were in high concentration in phreatic water and in low concentration in deep wells (As, V); (b) those which showed the opposite trend (Cu, Fe, Mn, Zn); and (c) those that were in very low concentrations in all water samples (Cd, Cr, Ni, Pb, and Se). In elements from group (a), a positive correlation between As content in water and in milk was observed. For elements included in group (b), it was observed a higher concentration in milk samples from farms that use deep wells, related with their higher concentrations in water. Cr, Ni, Pb, and Se milk contents are within the ranges reported in other areas. Soil and forage trace element content may contribute to their presence in milk. Since information about transference of trace elements from environmental matrices to milk is very scarce, at national and international levels, further studies are necessary, including speciation in milk and dairy products, to guarantee food safety.

Ituarte, C. and Arellano, F.E. 2015. Structural study of the ovary, oogenesis and brooding in Tonicia lebruni (Polyplacophora Chitonidae) from Patagonia. -Acta Zoologica (Stockholm) 00: 000-000 Tonicia lebruni, a common, lower intertidal and subtidal chiton inhabiting Patagonian rocky shores, is a gonochoristic iteroparous species producing large eggs (% 400 lm in diameter), which are fertilized and brooded within the pallial groves until released as juveniles. A free larval stage is absent, despite this, T. lebruni is widely distributed along the south-western Atlantic. At Puerto Deseado, T. lebruni has a marked seasonality in the reproductive cycle, reproducing only once a year. The reproductive period is quite short and defined in time: spawning and brooding take place during the late austral winter and beginning of spring. Recovery of the female gonad starts very soon after spawning. Oogenesis takes about 10-11 months for completion. Brood size is correlated with length of maternal individual. The number of embryos per brood varied between 785 and 5945. Extensive resorption of abortive eggs is viewed as related to limitation of space available for brooding. The egg hull is formed by a large number of minute pentagonal or hexagonal plates each one bearing a short spine bent onto the egg surface. The morphology and the surface of the hull could contribute to the cohesiveness of the brooded egg mass within the pallial grooves.Cristi an Ituarte, Divisi on Zoolog ıa Invertebrados,

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