FN Archimer Export Format
PT J
TI The planktonic food web of the Bizerte lagoon (south-western Mediterranean) during summer: I. Spatial distribution under different anthropogenic pressures
BT 
AF HLAILI, A
   GRAMI, B
   NIQUIL, N
   GOSSELIN, M
   HAMEL, D
   TROUSSELLIER, Marc
   MABROUK, H
AS 1:1;2:1,2;3:2;4:3;5:3;6:4,5;7:1;
FF 1:;2:;3:;4:;5:;6:;7:;
C1 Fac Sci Bizerte, Lab Cytol Vegetale & Phytoplanctonol, Zarzouna 7021, Bizerte, Tunisia.
   Univ Rochelle, IFREMER, CNRS, UMR 6217,Ctr Rec Ecosyst Littoraux Anthropises, F-17042 La Rochelle 1, France.
   Univ Quebec, Inst Sci Mer Rimouski, Rimouski, PQ G5L 3A1, Canada.
   Univ Montpellier 2, CNRS, UMR 5119, F-34095 Montpellier, France.
C2 UNIV CARTHAGE, TUNISIA
   UNIV ROCHELLE, FRANCE
   UNIV QUEBEC, CANADA
   UNIV MONTPELLIER, FRANCE
   IFREMER, FRANCE
SI MONTPELLIER
SE PDG-DOP-DCM-BOME-LALR
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
   copubli-int-hors-europe
   copubli-sud
IF 2.072
TC 46
UR https://archimer.ifremer.fr/doc/2008/publication-4116.pdf
LA English
DT Article
DE ;Anthropogenic pressure;Spatial distribution;Planktonic food web;Mediterranean lagoon
AB The structure and the trophic interactions of the planktonic food web were investigated during summer 2004 in a coastal lagoon of southwestern Mediterranean Sea. Biomasses of planktonic components as well as bacterial and phytoplankton production and grazing by microzooplankton were quantified at four stations (MA, MB, MJ and R) inside the lagoon. Station MA was impacted by urban discharge, station MB was influenced by industrial activity, station MJ was located in a shellfish farming sector, while station R represented the lagoon central area. Biomasses and production rates of bacteria (7-33 mg C m(-3); 17.5-35 mg C m(-3) d(-1)) and phytoplankton (80-299 mg C m(-3); 34-210 mg C m(-3) d(-1)) showed high values at station MJ, where substantial concentrations of nutrients (NO3- and Si(OH)(4)) were found. Microphytoplankton, which dominated the total algal biomass and production (>82%), were characterized by the proliferation of several chain-forming diatoms. Microzooplankton was mainly composed of dinoflagellates (Torodinium, Protoperidinium and Dinophysis) and aloricate (Lohmaniellea and Strombidium) and tintinnid (Tintinnopsis, Tintinnus, Favella and Eutintinnus) ciliates. Higher biomass of these protozoa (359 mg C m(-3)) was observed at station MB, where large tintinnids were encountered. Mesozooplankton mainly represented by Calanoida (Acartia, Temora, Calanus, Eucalanus, Paracalanus and Centropages) and Cyclopoida (Oithona) copepods, exhibited higher and lower biomasses at stations MA/MJ and MB, respectively. Bacterivory represented only 35% of bacterial production at stations MB and R, but higher fractions (65-70%) were observed at stations MA and MJ. Small heterotrophic flagellates and aloricate ciliates seemed to be the main controllers of bacteria. Pico- and nanophytoplankton represented a significant alternative carbon pool for micrograzers, which grazing represented 67-90% of pico- and nano-algal production in all stations. Microzooplankton has, however, a relatively low impact on microphytoplankton, as <= 45% of microalgal production was consumed in all stations. This implies that an important fraction of diatom production would be channelled by herbivorous meso-grazers to higher consumers at stations MA and MJ where copepods were numerous. Most of the microalgal production would, however, sink particularly at station MB where copepods were scare. These different trophic interactions suggest different food web structures between stations. A multivorous food web seemed to prevail in stations MJ and MA, whereas microbial web was dominant in the other stations. (C) 2007 Elsevier Ltd. All rights reserved.
PY 2008
PD JUL
SO Estuarine, Coastal and Shelf Science
SN 0272-7714
PU Elsevier
VL 78
IS 1
UT 000255725900007
BP 61
EP 77
DI 10.1016/j.ecss.2007.11.010
ID 4116
ER

EF