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Title

Variability of deep chlorophyll maximum characteristics in the Northwestern Mediterranean

AuthorsEstrada, Marta ; Marrasé, Cèlia ; Latasa, Mikel ; Berdalet, Elisa ; Delgado, Maximino ; Riera, Tecla
Issue DateFeb-1993
PublisherInter Research
CitationMarine Ecology Progress Series 93: 289-300 (1993)
AbstractA well-developed deep chlorophyll maximum (DCM) is a prominent feature of the Northwestern Mediterranean during a large part of the year. Data from 7 oceanographic surveys carried out across the Catalano-Balearic Sea, between 1982 and 1987, have been used to analyze short-term (within cruises) and seasonal+interannual (between cruises) variation of several parameters (such as surface and DCM chlorophyll concentration, integrated chlorophyll, DCM, nitracline and nitrite maximum depths). Significant positive correlations (p < 0.01) were found between the depths of the DCM, of the nitracline and of the nitrite maximum. Surface chlorophyll concentrations and average chlorophyll values for the upper 1 10 m of the water column were signicantly correlated for only 2 of the 7 cruises. The relationship between integrated primary production and surface or integrated chlorophyll concentrations presented considerable scatter due, in part, to physiological variability of the sampled communities. After exclusion of 1 statistically outlying point, apparently corresponding to a sedimenting bloom, a multiple linear regression model of integrated primary production (mg C m-2 h-1) on integrated chlorophyll, euphotic zone depth and a stability parameter explained 74 % of the data variance. However, the presence of such 'outliers' limits the usefulness of these models and stresses the need of physiological information for a reliable prediction of primary productivity
Description12 pages, 9 figures, 5 tables
Publisher version (URL)https://dx.doi.org/10.3354/meps092289
URIhttp://hdl.handle.net/10261/182968
Identifiersdoi: 10.3354/meps092289
issn: 0171-8630
e-issn: 1616-1599
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