IADO   05364
INSTITUTO ARGENTINO DE OCEANOGRAFIA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Inorganic nutrients distribution in the coastal zone close to Ushuaia city, Tierra del Fuego, Sothest Argentina.
Autor/es:
OSCAR AMÍN; LAURA COMOGLIO; CARLA V. SPETTER; CLAUDIA DUARTE; RAÚL O. ASTEASUAIN; RUBÉN H. FREIJE; JORGE E. MARCOVECCHIO
Lugar:
Bahía Blanca, Argentina
Reunión:
Simposio; ECSA 44, Science and Management of Estauries and Coasts: A tale of two Hemispheres.; 2008
Institución organizadora:
Estuarine and Coastal Science Association e Instituto Argentino de Oceanografía
Resumen:
The study of the concentration and distribution of dissolved inorganic nutrients inseawater is one of the main tools to characterize aquatic environments, particularlycoastal marine and estuarine ones. Besides, the assessment of those processes involvedin nutrients production, consumption, regeneration or redistribution within theseenvironments are of great concern to adequately evaluate the correspondingbiogeochemical cycles. The present study deals with the determination of inorganicnutrients (NO2-, NO3-, PO43- y SiO33-) dissolved in seawater, photosynthetic pigments(chlorophyll a, phaeopigments) and particulate organic matter (POM) within suspendedparticulate matter (SPM) from 9 sampling sites within the coastal zone of Golondrinaand Ushuaia bays, in Tierra del Fuego, Argentina. Otherwise, temperature, dissolvedoxygen, salinity and pH were in situ measured. Data were statistically evaluated usingfactor analysis, obtaining three factors explaining 74.86% of total variance. The firstfactor accounts for 34% of the variance and includes PO43-, photosynthetic pigmentsand POM, representing zones with urbanization inputs. Factor 2 is negatively correlatedwith salinity and conductivity and positively with SiO33-, explaining 22.24% of thevariance, represents areas with input of freshwater from defrosting event. The thirdfactor (14.08% of total variance) contains negatively NO3- and temperature, could berelated mainly to natural biogenic input. Nutrient enrichment in the coastal zone appearto be linked with anthropogenic source and Nothofagus pumilio woods which appears tobe a nutrient-rich forest acts as a nutrient sink. Another important factors in nutrientdynamic are the defrost event and the presence of peatland in the study area.