FN Archimer Export Format
PT J
TI Pheopigment dynamics, zooplankton grazing rates and the autumnal ammonium peak in a Mediterranean lagoon
BT 
AF COLLOS, Yves
   HUSSEINI RATREMA, Julie
   BEC, Béatrice
   VAQUER, André
   HOAI, Thong Lam
   ROUGIER, Claude
   PONS, Virginie
   SOUCHU, Philippe
AS 1:1;2:1;3:1;4:1;5:1;6:1;7:1;8:2;
FF 1:;2:;3:;4:;5:;6:;7:;8:PDG-DOP-DCN-AGSAE-CREMA;
C1 Univ Montpellier 2, UMR 5119, CNRS, Montpellier 5, France.
   IFREMER, Lab Cotier DEL, F-34203 Sete, France.
C2 UNIV MONTPELLIER, FRANCE
   IFREMER, FRANCE
SI LA ROCHELLE
SE PDG-DOP-DCN-AGSAE-CREMA
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 0.978
TC 36
UR https://archimer.ifremer.fr/doc/2005/publication-727.pdf
LA English
DT Article
DE ;Zooplankton;Ammonium;Pheopigments;Degradation;Growth;Phytoplankton
AB The dilution technique was used to estimate chlorophyll and pheopigment, net and gross production as well as zooplankton grazing over a 12-month period in a coastal lagoon in Southern France. Chlorophyll a (Cha) based gross growth rates of phytoplankton ranged from undetectable in February to 2.6 day(-1) in June, corresponding to 3.8 divisions per day. Cha-based grazing rates ranged from undetectable in February to 1.1 d(-1) in June. The seasonal growth pattern of picoplankton was similar to that of the whole community, with a peak in July, corresponding to four divisions per day. Grazing processes represented from 20 to 150% of the phytoplankton daily growth, and the grazing pressure was stronger on small phytoplankton cells than on larger cells. Gross growth rates of phytoplankton were related to zooplankton grazing rates, and both were related to water temperature. Mesozooplankton which escaped sampling or oysters had to be also invoked as additional sinks for the primary production. In the fall, pheopigment concentrations greater than chlorophyll concentrations coincided with high ammonium levels in the water column. Pheopigment a production rates were highly correlated to chlorophyll -based microzooplankton grazing rates. The pheopigment a to chlorophyll a ratio was correlated with aminonium concentrations and could be used an index of the balance between ammonium supply (degradation) and demand (uptake by phytoplankton). In addition, pheopigment degradation rates in absence of grazing could be related to irradiance, indicating photo-degradation of these compounds.
PY 2005
PD NOV
SO Hydrobiologia
SN 0018-8158
PU Kluwer
VL 550
IS 1
UT 000232980900008
BP 83
EP 93
DI 10.1007/s10750-005-4365-1
ID 727
ER

EF