Environmental drivers of phytoplankton distribution and composition in Tagus Estuary, Portugal

被引:97
作者
Gameiro, C.
Cartaxana, P.
Brotas, V.
机构
[1] Univ Lisbon, Inst Oceanog, Fac Ciencias, P-1749016 Lisbon, Portugal
[2] IMAR, Lab Maritimo Guia, P-2750374 Cascais, Portugal
关键词
phytoplankton; environmental drivers; chlorophyll a; chemotaxonomy; monitoring; Tagus estuary;
D O I
10.1016/j.ecss.2007.05.014
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
A 7-year (March 1999-November 2005) monitoring program was developed in the Tagus estuary to study phytoplankton dynamics and several key controlling factors, namely nutrient content, light availability, atmospheric and hydrodynamic conditions (temperature, wind, rainfall, river flow, and salinity). Water was collected at four sampling sites on a monthly basis. Phytoplankton biomass, analyzed as Chl a, was moderate to low, when compared to other mesotidal estuaries: interannual average Chl a values ranged from 1.4 in winter to 8.0 ug L-1 in summer. A consistent seasonal pattern was observed, with a unimodal peak extending from late spring to summer. The phytoplankton community, as determined by biomarker pigment concentration using HPLC and CHEMTAX, was dominated by diatoms (57%), and included cryptophytes (23%), dinoflagellates (6.8%), chlorophytes (5.4%), euglenophytes (4.9%), and prasinophytes (2.6%). The method was capable of detecting phytoplankton taxa generally underestimated or overlooked when using standard microscopic techniques. Diatoms were the main bloom-formers in the summer Chl a maximum. A stepwise regression analysis showed that air temperature, river flow and irradiance explained 47% of the observed Chl a variance, illustrating the importance of climatic factors as driving forces for seasonal and interannual variability of phytoplankton. (c) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:21 / 34
页数:14
相关论文
共 50 条
[1]   PHYTOPLANKTON GROWTH-RATES IN A LIGHT-LIMITED ENVIRONMENT, SAN-FRANCISCO BAY [J].
ALPINE, AE ;
CLOERN, JE .
MARINE ECOLOGY PROGRESS SERIES, 1988, 44 (02) :167-173
[2]   The use of pigment signatures to assess phytoplankton assemblage structure in estuarine waters [J].
Ansotegui, A ;
Trigueros, JM ;
Orive, E .
ESTUARINE COASTAL AND SHELF SCIENCE, 2001, 52 (06) :689-703
[3]  
BENDSCHNEIDER K, 1952, J MAR RES, V11, P87
[4]  
Brotas V, 1996, OCEANOL ACTA, V19, P623
[5]  
Cabecadas G., 2000, Seas at the millennium: an environmental evaluation, VI, P151
[6]   Phytoplankton production in the Tagus estuary (Portugal) [J].
Cabeçadas, L .
OCEANOLOGICA ACTA, 1999, 22 (02) :205-214
[7]   The relative importance of light and nutrient limitation of phytoplankton growth: a simple index of coastal ecosystem sensitivity to nutrient enrichment [J].
James E. Cloern .
Aquatic Ecology, 1999, 33 (1) :3-15
[8]   Phytoplankton bloom dynamics in coastal ecosystems: A review with some general lessons from sustained investigation of San Francisco Bay, California [J].
Cloern, JE .
REVIEWS OF GEOPHYSICS, 1996, 34 (02) :127-168
[9]   SIGNIFICANCE OF BIOMASS AND LIGHT AVAILABILITY TO PHYTOPLANKTON PRODUCTIVITY IN SAN-FRANCISCO BAY [J].
COLE, BE ;
CLOERN, JE .
MARINE ECOLOGY PROGRESS SERIES, 1984, 17 (01) :15-24
[10]  
COSTA MJ, 1999, ESTUARIO TEJO