41,952 research outputs found
Imposex and accumulation of organotin compounds in population of Hexaplex trunculus (Gastropoda, Muricidae) from the Lagoon of Venice (Italy) and Istrian Coast (Croatia)
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Imposex in Hexaplex trunculus at some sites of the north Mediterranean coast as a baseline for future evaluation of the effectiveness of the total ban of organotin based antifouling paints.
No full textImposex - the superimposition of male sexual organs (penis and vas deferens) onto female Neogastropods such as Hexaplex trunculus (Linne, 1758) - is used world-wide as a biomarker of ecological impact of organotin based antifouling biocides (TBT and TPhT). To limit the impact of organotin pollution, since January 1, 2003, the International Maritime Organization (IMO) has enacted a global ban on the use of organotin compounds in antifouling systems. It is important to record imposex levels and organotin contamination before the implementation of the ban, in order to assess the current situation and be able, in the future, to verify the effects of the International Protocol. In this paper, recent imposex data measured in populations of Hexaplex trunculus from three different Mediterranean regions are compared: the Ligurian Sea (Italy), the Lagoon of Venice (Italy) and the western coast of Istria (Croatia). In the two former locations, a partial ban on TBT has been in force for vessels less than 25 m since 1982, while in the latter region no restrictions on organotin antifouling paints have been applied yet. Gastropod samples collected from the Venice lagoon were analysed with an acid extraction followed by Grignard derivatisation, clean up and GC-MS determination, in order to relate the levels of TBT, TPhT and their metabolites with the imposex degree detected. Biological data show that the levels of imposex were very high (VDS from 4.3 to 5) in all the sampling sites considered, particularly in the Croatian coast stations. The concentrations of organotin compounds - butyltins and phenyltins - measured in the samples from the lagoon of Venice were found to partition differently in the visceral coil and in the rest of the soft body of the analysed organisms
Presenza di anellidi policheti in cappasanta (Pecten jacobaeus L.) nel nord Adriatico. / Investigation on polychaetes (Anellida) in scallops (Pecten jacobaeus L.) in the North Adriatic sea.
No full textErratum to: Effect of moderate red wine intake on cardiac prognosis after recent acute myocardial infarction of subjects with Type 2 diabetes mellitus (Diabetic Medicine, (2006), 23, 9, (974-981), 10.1111/j.1464-5491.2006.01886.x)
No full textIn an article by Marfella et al, the author name C. Saron is incorrect and should be listed as C. Sardu. Therefore the correct author list is: R. Marfella, F. Cacciapuoti, M. Siniscalchi, F. C. Sasso, F. Marchese, F. Cinone, E. Musacchio, M. A. Marfella, L. Ruggiero, G. Chiorazzo, D. Liberti, G. Chiorazzo, G. F. Nicoletti, C. Sardu, F. D'Andrea, C. Ammendola, M. Verza and L. Coppola.In an article by Marfella et al, the author name C. Saron is incorrect and should be listed as C. Sardu. Therefore the correct author list is: R. Marfella, F. Cacciapuoti, M. Siniscalchi, F. C. Sasso, F. Marchese, F. Cinone, E. Musacchio, M. A. Marfella, L. Ruggiero, G. Chiorazzo, D. Liberti, G. Chiorazzo, G. F. Nicoletti, C. Sardu, F. D'Andrea, C. Ammendola, M. Verza and L. Coppola
Imposex in Hexaplex trunculus at some sites on the North Mediterranean Coast as a base-line for future evaluation of the effectiveness of the total ban of organotin based antifouling paints
No full textThe changing state of contamination in the lagoon of Venice. Part 2: Heavy metals
No full textAbstract\ud
In order to verify whether pollution is increasing or decreasing, in 25 locations uniformly distributed in the central part of the Lagoon\ud
of Venice, a transitional environment suffering from man’s urban and industrial activities, the same sampling scheme was repeated three\ud
times (in 1987, 1993 and 1998) over a 12-year period during which the lagoonal environment underwent substantial changes. Superficial\ud
sediments were sampled and analysed for heavy metals and total organic carbon contents, grain size and density. In general heavy metal\ud
contents were found to be correlated, with concentrations above the background level, e.g., for Hg, a concentration factor of 24 was\ud
observed in 1987. A temporal decrease in concentrations was observed for most of the metals. Detailed analysis on a smaller spatial scale\ud
showed that contamination significantly decreases from the inner border of the lagoon seawards, as highlighted in contour maps. The\ud
role of the Porto Marghera industrial zone as a source of pollutants at the border of the Lagoon was confirmed. The decrease in contamination\ud
could not be attributed only to a decrease in the intensity of sources, but also to erosion processes, worsened by intensive\ud
harvesting of clams with hydraulic dredges.\ud
2005 Elsevier Ltd. All rights reserved
[Memo from Lieutenant Colonel M. F. Hass, Civil Affairs Division, with amendments to an evacuation proposal]
No full textA memorandum sent form Lieutenant General M. F. Hass, Civil Affairs Division, which has two corrections from a an evacuation proposal originally sent on May 13, 1942. The correction changes the destination to the Merced Assembly Center.The War Relocation Authority (WRA), together with the Wartime Civil Control Administration (WCCA), the Civil Affairs Division (CAD) and the Office of the Commanding General (OFG) of the Western Defense Command (WDC) operated together to segregate and house some 110,000 men women and children from 1942 to 1945. The collection contains documents and photographs relating to the establishment and administrative workings of the (WDC), the (WRA) and the (WCCA) for the year 1942
Spatial asymmetry of the paternity success in nests of a fish with alternative reproductive tactics
No full textGuard-sneaker tactics are widespread among fish, where territorial males defend a nest and provide parental care while sneakers try to steal fertilizations. Territorials and sneakers adopt diverse pre- and post-mating strategies, adjusting their ejaculate investment and/or behavioural responses to the presence of competitors. The relative distance of competitors from the spawning female plays a major role in influencing male mating strategies and the resulting paternity share. However, territorial male quality and sneaking intensity do not fully account for the variability in the relative siring success occurring among species. An often neglected factor potentially affecting sneakers proximity to females is the nest structure. We conducted a field experiment using the black goby, whose nests show two openings of different size. We found that territorial males defend more and sneaking pressure is higher at the front, larger access of the nest than at the back, smaller one. Moreover, microsatellite paternity analysis shows that territorials sire more offspring at the back of their nest. Such a predictable spatial distribution of the paternity share suggests that nest structure might work as an indirect cue of male relative siring success, potentially influencing the territorial male investment in parental care and/or the female egg deposition strategy
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