A. Carballeira
University of Santiago de Compostela, Ecologia, Faculty Member
VI Reunión Nacional de Climatología. Asociación de Geógrafos Españoles. Santiago de Compostela, 14-16 de septiembre de 200
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... Page 8. CARBALLE1RA OCAÑA, Alejo Bancos de especímenes ambientales : Una propuesta para Galicia / Alejo Carballeira Ocaña, Jesús Aboal Viñas. ... a la utili-zación de la gasolina sin plomo3, confirma la eficacia de la política... more
... Page 8. CARBALLE1RA OCAÑA, Alejo Bancos de especímenes ambientales : Una propuesta para Galicia / Alejo Carballeira Ocaña, Jesús Aboal Viñas. ... a la utili-zación de la gasolina sin plomo3, confirma la eficacia de la política ambiental seguida en Alemania (Figura 2). De ...
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The size of the area affected by contamination processes mainly depends on the type of contaminant and the way it is emitted. In regular sampling, the size of the sampling grid will therefore interact with the scale at which the... more
The size of the area affected by contamination processes mainly depends on the type of contaminant and the way it is emitted. In regular sampling, the size of the sampling grid will therefore interact with the scale at which the contamination processes are produced, for each contaminant, so that the grid will only enable characterization of those processes that occur at scales larger than the grid, i.e. large scale processes. The present study analysed the data corresponding to tissue concentrations of Cd, Cu, Fe, Hg, Mn, Pb, Se, V and Zn in the terrestrial moss Pseudoscleropodium purum obtained in regular sampling surveys with grids of different sizes (15x15, 7.5x7.5 km) plus a series of accessory points located at 1 km from the 15x15 km sampling grid; all sampling sites were located in Galicia and were sampled in March 2004. The objective of the study was to characterize the interaction between the scale of the sampling grid and the scale at which the contamination processes are produced, for each contaminant, to enable adjustment of the size of the grids to the scale at which the contamination processes are mainly produced. For this purpose, the spatial structure of the concentration of each element was analysed by use of semivariograms created with a robust estimator of the semivariance. The results of the study verified the existence of a real interaction between the scale of the sampling grid and the scale of the contamination processes. The results also demonstrated how in the study area, the contamination processes associated with Cd, Pb and V are generally small scale processes, whereas those associated with Cu, Hg and Se are generally large scale processes.
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In the present study the effects of gender, age and nutritional status on tissue concentrations of some trace elements (Zn, Cu, Mn, and Cr) in wood mouse (Apodemus sylvaticus), Spanish shrew (Sorex granarius), and great white-toothed... more
In the present study the effects of gender, age and nutritional status on tissue concentrations of some trace elements (Zn, Cu, Mn, and Cr) in wood mouse (Apodemus sylvaticus), Spanish shrew (Sorex granarius), and great white-toothed shrew (Crocidura russula) were investigated. Four sampling stations were selected for the study: a restored mine dump, an area characterised by ultrabasic soil and two sites in oak woods in the vicinity of a power plant. Gender had no effect on the tissue concentrations of the metals studied, except for the concentration of Zn in brain tissue from C. russula. The relative age of the individuals was estimated on the basis of crystalline lens weight in mice and dental abrasion in shrews, as body weight was considered a poor indicator of age because of the strong interindividual overlap in the populations. Age was only significantly (and negatively) correlated with the concentration of Cr in livers of mice from one station, a finding that may indicate physiological stress on growth at this site. The nutritional status was estimated from the body mass index; the relationships between this index and metal concentrations for both A. sylvaticus and C. russula were negative, which can be attributed to the weight-specific metabolic rate that leads to a relatively low uptake of metals per unit of body weight. As there was no relation between duration of exposure and concentrations of metals in the organs analysed, age should not be included as a variable factor in the condition index.