%0 Journal Article
%T Ultra- and microplankton assemblages as indicators of trophic status in a Mediterranean lagoon
%+ Laboratoire Chrono-environnement (UMR 6249) (LCE)
%+ Institut méditerranéen d'océanologie (MIO)
%+ Fermentation et de Développement de Vaccins Virologiques
%A Dhib, Amel
%A Denis, Michel
%A Barani, Aude
%A Turki, Souad
%A Aleya, Lotfi
%< avec comité de lecture
%@ 1470-160X
%J Ecological Indicators
%I Elsevier
%V 64
%P 59 - 71
%8 2016-05
%D 2016
%R 10.1016/j.ecolind.2015.12.032
%K Heterotrophic prokaryotes
%K Ultraphytoplankton
%K Microplankton
%K Abiotic variables
%K Ghar El Melh Lagoon
%Z Environmental Sciences/Global Changes
%Z Environmental Sciences/Biodiversity and Ecology
%Z Environmental Sciences/Environment and Society
%Z Environmental Sciences/Environmental Engineering
%Z Sciences of the Universe [physics]/Ocean, Atmosphere
%Z Life Sciences [q-bio]/Biodiversity
%Z Life Sciences [q-bio]/Ecology, environmentJournal articles
%X The seasonal abundance distribution of heterotrophic prokaryotes, pico-and nanophytoplankton, was investigated in connection with environmental variables and microplankton abundance at five stations in Ghar El Melh Lagoon (northeastern Tunisia). Flow cytometry analysis of ultraplankton resolved (i) five heterotrophic prokaryote groups labelled LNA1, LNA2 (low nucleic acid content), HNA1, HNA2 and HNA3 (high nucleic acid content) and (ii) at least 14 ultraphytoplankton groups assigned to picoeukaryotes, picoprokaryotes, nanoeukaryotes, cryptophyte-like cells and some unknown communities. Redundancy analysis (RDA) revealed (i) autumn-summer outbreaks of heterotrophic prokaryotes dominated by HNA groups and (ii) winter-summer proliferation of ultraphytoplankton dominated by nanophytoplankton groups. Generalized additive models (GAM) highlighted the role of (i) water temperature and orthophos-phate concentrations in heterotrophic prokaryote distribution and (ii) water temperature and salinity in ultraphytoplankton abundance variation. Based on Spearman's rank correlation, significant negative correlations were established between ultra-and microplankton communities suggesting that, through grazing pressure, microplankton may be behind the drastic decrease in ultraplankton abundances in spring.
%G English
%L hal-01436592
%U https://hal.science/hal-01436592
%~ SDE
%~ INSU
%~ RIIP
%~ UNIV-TLN
%~ CNRS
%~ UNIV-AMU
%~ UNIV-FCOMTE
%~ CHRONO-ENVIRONNEMENT
%~ RIIP_TUNIS
%~ MIO
%~ OSU-INSTITUT-PYTHEAS
%~ GIP-BE
%~ MIO-CYBELE