CADIC   02618
CENTRO AUSTRAL DE INVESTIGACIONES CIENTIFICAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Inorganic nutrients distribution in the coastal zone close to Ushuaia city, Tierra del Fuego, Southest Argentina
Autor/es:
AMIN, OSCAR; COMOGLIO LAURA; SPETTER, CARLA; DUARTE, CLAUDIA; ASTESUAIN, RAUL; FREIJE, HUGO; MARCOVECCHIO, JORGE
Lugar:
Bahía Blanca, Argentina
Reunión:
Simposio; Science and Management of Estuaries and Coasts: a Tale of Two Hemispheres ECSA44; 2008
Institución organizadora:
Estuarine and Coastal Shellfish Association - ECSA-
Resumen:
The study of the concentration and distribution of dissolved inorganic nutrients in
seawater is one of the main tools to characterize aquatic environments, particularly
coastal marine and estuarine ones. Besides, the assessment of those processes involved
in nutrients production, consumption, regeneration or redistribution within these
environments are of great concern to adequately evaluate the corresponding
biogeochemical cycles. The present study deals with the determination of inorganic
nutrients (NO2-, NO3-, PO43- y SiO33-) dissolved in seawater, photosynthetic pigments
(chlorophyll a, phaeopigments) and particulate organic matter (POM) within suspended
particulate matter (SPM) from 9 sampling sites within the coastal zone of Golondrina
and Ushuaia bays, in Tierra del Fuego, Argentina. Otherwise, temperature, dissolved
oxygen, salinity and pH were in situ measured. Data were statistically evaluated using
factor analysis, obtaining three factors explaining 74.86% of total variance. The first
factor accounts for 34% of the variance and includes PO43-, photosynthetic pigments
and POM, representing zones with urbanization inputs. Factor 2 is negatively correlated
with salinity and conductivity and positively with SiO33-, explaining 22.24% of the
variance, represents areas with input of freshwater from defrosting event. The third
factor (14.08% of total variance) contains negatively NO3- and temperature, could be
related mainly to natural biogenic input. Nutrient enrichment in the coastal zone appear
to be linked with anthropogenic source and Nothofagus pumilio woods which appears to
be a nutrient-rich forest acts as a nutrient sink. Another important factors in nutrient
dynamic are the defrost event and the presence of peatland in the study area.2-, NO3-, PO43- y SiO33-) dissolved in seawater, photosynthetic pigments
(chlorophyll a, phaeopigments) and particulate organic matter (POM) within suspended
particulate matter (SPM) from 9 sampling sites within the coastal zone of Golondrina
and Ushuaia bays, in Tierra del Fuego, Argentina. Otherwise, temperature, dissolved
oxygen, salinity and pH were in situ measured. Data were statistically evaluated using
factor analysis, obtaining three factors explaining 74.86% of total variance. The first
factor accounts for 34% of the variance and includes PO43-, photosynthetic pigments
and POM, representing zones with urbanization inputs. Factor 2 is negatively correlated
with salinity and conductivity and positively with SiO33-, explaining 22.24% of the
variance, represents areas with input of freshwater from defrosting event. The third
factor (14.08% of total variance) contains negatively NO3- and temperature, could be
related mainly to natural biogenic input. Nutrient enrichment in the coastal zone appear
to be linked with anthropogenic source and Nothofagus pumilio woods which appears to
be a nutrient-rich forest acts as a nutrient sink. Another important factors in nutrient
dynamic are the defrost event and the presence of peatland in the study area.3-, photosynthetic pigments
and POM, representing zones with urbanization inputs. Factor 2 is negatively correlated
with salinity and conductivity and positively with SiO33-, explaining 22.24% of the
variance, represents areas with input of freshwater from defrosting event. The third
factor (14.08% of total variance) contains negatively NO3- and temperature, could be
related mainly to natural biogenic input. Nutrient enrichment in the coastal zone appear
to be linked with anthropogenic source and Nothofagus pumilio woods which appears to
be a nutrient-rich forest acts as a nutrient sink. Another important factors in nutrient
dynamic are the defrost event and the presence of peatland in the study area.3-, explaining 22.24% of the
variance, represents areas with input of freshwater from defrosting event. The third
factor (14.08% of total variance) contains negatively NO3- and temperature, could be
related mainly to natural biogenic input. Nutrient enrichment in the coastal zone appear
to be linked with anthropogenic source and Nothofagus pumilio woods which appears to
be a nutrient-rich forest acts as a nutrient sink. Another important factors in nutrient
dynamic are the defrost event and the presence of peatland in the study area.3- and temperature, could be
related mainly to natural biogenic input. Nutrient enrichment in the coastal zone appear
to be linked with anthropogenic source and Nothofagus pumilio woods which appears to
be a nutrient-rich forest acts as a nutrient sink. Another important factors in nutrient
dynamic are the defrost event and the presence of peatland in the study area.Nothofagus pumilio woods which appears to
be a nutrient-rich forest acts as a nutrient sink. Another important factors in nutrient
dynamic are the defrost event and the presence of peatland in the study area.
Keywords: Inorganic nutrients, Tierra del Fuego, land sources