期刊
ESTUARINE COASTAL AND SHELF SCIENCE
卷 67, 期 3, 页码 343-354出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ecss.2005.10.020
关键词
phytoplankton size-classes; pigments; monitoring; Nervion River estuary
In the context of a monitoring program developed in the Nervion River estuary, the structure of the phytoplankton community was assessed by means of microscopy and high-performance liquid chromatography (HPLC) analysis of pigments. Four size fractions were considered: < 3 mu m (picoplankton), 3-8 mu m (small nanoplankton), 8-20 mu m (large nanoplankton) and > 20 mu m (microplankton). Samples were taken in spring and summer at three sites located in the marine extreme of the estuary. Fucoxanthin, chlorophyll b and alloxanthin were the most abundant signature pigments. Fucoxanthin alone explained more than 95% of the total chlorophyll a variance. Most of the chlorophyll a and the major signature pigments were included in the nano- and microplankton size fractions, denoting the high trophic status of the water. The picoplankton, dominated by chlorophyll b containing algae or eustigmatophytes, accounted always for less than 5% of the total chlorophyll a. The fucoxanthin/chl a ratio of natural communities was highest in the microplankton and large nanoplankton whereas that of alloxanthin/chl a was generally highest in the small nanoplankton and that of chl b/chl a reached the highest values in the picoplankton. (c) 2005 Elsevier Ltd. All rights reserved.
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