Mudanças na paleotemperatura e paleoprodutividade nos últimos 40 mil anos: Margem Continental NW Ibérica

This work aims to identify changes in paleoceanographic conditions on the NW Iberian Continental Margin during the last ~40 ka BP. Paleotemperatures expressed as mean annual Sea Surface Temperature (SSTma) and paleoproductivities expressed as Export Productivity (Pexpma) were evaluated using the modern analog technique SIMMAX 28, based on planktonic foraminifera census counts. The study took into account the results of 180 samples collected along the core KC024-19 (sampled at 1-cm interval), recovered from the Galician (NW Spain) continental slope (42°08’98’’N, 10°29´96’’W, and 2765 m). The chronology was based on eight radiocarbon dates (in foraminifera by AMS), in δ18O stratigraphy and in the record of the four last Heinrich Events (HEs). Variations in the supply of phytodetritus to the sea floor were assessed by using the total percentage of phytodetrital-dependent benthic foraminifera species (PhyBF). Results give variations of SSTma between 0.9-20.2 ºC and Pexpma between 12.6-108 gC/m2/y. The lowest values of SSTma were recorded during the HEs, which agree with the southward migration of the glacial polar front. Significant decreases of Pexpma and PhyBF values are recorded during the HEs, but mostly in HE1. During the HEs Globigerina bulloides and Neogloboquadrina (dextral), the most important species related to the upwelling system, are largely replaced by Neogloboquadrina pachyderma (sinistral); in benthic foraminifera assemblages the deep endofaunal species were able to consume degraded organic of lower quality and tolerate low oxic condition increase. These results suggest the occurrence of significant changes in the hydrographic conditions on the Iberian Continental Margin during these HEs (but mostly in HE1) both in surface and deep-water masses circulation

Prevalência de Echinococcus granulosus (Batsch, 1786) em cães urbanos errantes do município de Dom Pedrito (RS), Brasil Prevalence of Echinococcus granulosus (Batsch, 1786) in urban stray dogs from Dom Pedrito in the State of Rio Grande do Sul, Brazil

Echinococcus granulosus é um dos parasitas mais importantes envolvidos em zoonoses de municípios próximos a fronteira do Rio grande do Sul com a Argentina e Uruguai. Amostras de 65 cães urbanos errantes do município de Dom Pedrito foram analisadas por meio de três técnicas: purgação pelo bromidrato de arecolina para visualização da presença do parasito; ensaio de imunoadsorção enzimática (ELISA), para detecção de coproantígenos, imunofluorescência indireta (IFI), para detecção de anticorpos séricos contra E. granulosus. Destes cães, 7,7% (5/65) apresentaram o parasita nas fezes, 10,8 (7/65) coproantígenos e 13,8% (9/65) anticorpos séricos contra o cestódeo. Conclui-se que a equinococose canina, no meio urbano, pode representar um sério problema à saúde pública, devido ao risco de hidatidose humana.<br>Echinococcus granulosus is the one of the most important parasites involved in zoonosis in the State of Rio Grande do Sul, in cities near the Argentinian and Uruguayian border. Sixty-five samples of urban stray dogs from Dom Pedrito county were analyzed by three techniques: purgation by arecoline hydrobromide, to verify the presence of the parasite; enzyme-linked immunosorbent assay test (ELISA), to detect the coproantigen and indirect immunofluorescence antibody test (IFA) to identify serum antibodies against E. granulosus. From the analyzed dogs 7.7% (5/65) have presented the parasite in feces, 10.8% (7/65) had coproantigens and 13.8% (9/65) serum antibodies against this cestode. It was concluded that canine echinococcosis in the urban zone may represent a serious problem to public health, due to hidatidosis risk for humans