Sources of nutrients and seasonal dynamics of chlorophyll in the inner shelf off Paraná State-South Brazil Bight

Brandini, Frederico Pereira, da Silva, Ariel Scheffer , da Silva, Eduardo Teixeira, and Kolm, Hedda (2007) Sources of nutrients and seasonal dynamics of chlorophyll in the inner shelf off Paraná State-South Brazil Bight. Journal of Coastal Research, 23 (5). pp. 1131-1140.

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Abstract

The seasonal dynamics of phytoplankton chlorophyll and nutrients were studied between August 1997 and March 1999 along a cross-shelf section of the inner coastal of Paraná State, southern Brazil. Vertical thermohaline stratifications in the rainy summer alternated with winter homogeneities. Nitrate-N varied from 0.17 to 1.13 µM, nitrite-N from 0.04 to 1.10 µM, phosphate-P from 0.37 to 0.73 µM, and silicate-Si from 2.5 to 10.2 µM, all presenting maximum concentrations at the bottom layers at the outer stations. Chlorophyll concentrations varied from <0.02 to 10.8 µg·L−1 throughout the study period, with maxima at subsurface and bottom layers depending on the season. Seasonal differences in the distributional patterns of nutrients and chlorophyll were caused by two main wind-driven physical processes: (i) onshore intrusions of South Atlantic Central Waters and (ii) remote continental runoff from La Plata River. These were considered the main sources of new nutrients in summer and winter periods, respectively. Phytoplankton biomass (indicated by chlorophyll concentrations) tends to accumulate at subsurface layers, representing the primary source of organic matter for pelagic and benthic habitats in the inner shelf off Paraná State.

Item ID: 2423
Item Type: Article (Refereed Research - C1)
Keywords: chlorophyll; nutrients; hydrography; inner shelf dynamics; South Brazil Bight
ISSN: 1551-5036
Date Deposited: 11 Jun 2009 00:32
FoR Codes: 06 BIOLOGICAL SCIENCES > 0607 Plant Biology > 060701 Phycology (incl Marine Grasses) @ 50%
03 CHEMICAL SCIENCES > 0305 Organic Chemistry > 030503 Organic Chemical Synthesis @ 50%
SEO Codes: 96 ENVIRONMENT > 9611 Physical and Chemical Conditions of Water > 961104 Physical and Chemical Conditions of Water in Marine Environments @ 100%
Citation Count from Web of Science Web of Science 4
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