Assessment of land influence on a high latitude marine coastal system: Tierra del Fuego, southernmost Argentina

AMIN, OSCAR ANTONIO; COMOGLIO, LAURA INÉS; SPETTER CARLA; DUARTE, CLAUDIA; ASTEASUAIN; FREIJE R.H; MARCOVECCHIO JORGE

ENVIRONMENTAL MONITORING AND ASSESSMENT

SPRINGER

Lugar: Filipinas; Año: 2010 vol. 175 p. 63 - 73

0167-6369

The study deals with the determination of physico-chemical parameters, inorganic nutrients, particulate organic matter and photosynthetic pigments on a monthly basis during an annual cycle from 9 sampling sites of the coastal zone of a high latitude ecosystem (Tierra del Fuego, Argentina). Nitrites and phosphates concentrations were similar to other systems of south Atlantic coast (median 0.30 and 1.02 µM respectively), while nitrates were higher in all sampling periods (median 45.37 µM), and silicates were significantly smaller (median 7.76 µM). Chlorophyll a and phaeopigments have shown median values of 0.38 and 0.85 mg m-3, respectively, while saturated values of dissolved oxygen were recorded throughout the study. The analysis reflected that nutrient enrichment seems to be linked to an anthropogenic source, the presence of peatlands areas and a sink of Nothofagus pumilio woods. The area could be characterized in three zones related to: i) high urban influence ii) natural inputs of freshwater and iii) mixed inputs coming from moderate urban impacts.