@article{PAR00022975, title = {{T}he influence of environmental characteristics on the distribution of ciliates in two coastal areas in the {E}astern {M}editerranean {S}ea ({G}ulf of {G}abes, {T}unisia)}, author = {{K}miha-{M}egdiche, {S}. and {R}ekik, {A}. and {P}agano, {M}arc and {A}yadi, {H}. and {E}lloumi, {J}.}, editor = {}, language = {{ENG}}, abstract = {{S}patial variability of ciliates in relation to chlorophyll a, nutrients, and environmental variables were studied in lagoon ({B}oughrara lagoon) and marine ecosystems ({G}hannouch coast) in the surface layer and at the water-sediment interface during autumn. {R}esults revealed a striking difference between the two ecosystems, with higher nutrient concentrations at the {G}hannouch coast, except for ammonium. {C}iliate abundance was five to six times higher in the lagoon (123.43-126.80 x 10(2) cells l(-1)) than at the marine coast (21.80-24.50 x 10(2) cells l(-1)) ({ANOVA}, {P} < 0.001). {L}oricate ciliate attained high abundance in {B}oughrara lagoon (88%-90% of total ciliates abundance) and decreased at {G}hannouch coast (44%-51% of total ciliate abundance). {T}he species richness of the loricate ciliates was higher in {B}oughrara lagoon (68 taxa at both surface layer and water-sediment interface) than at {G}hannouch coast (32 taxa at the surface layer and 23 taxa at the water-sediment interface). {N}aked ciliates were poorly represented (10%-12% of the total ciliate abundance) in the lagoon stations but had substantial percentages (49%-56% of the total ciliate abundance) at {G}hannouch coast. {T}he spatial distribution patterns of ciliate communities at both sites were strongly influenced by nutrient heterogeneity. {S}mall species (naked ciliates) are favoured by higher nutrient concentrations at {G}hannouch coast, whereas the contribution of large species (loricate ciliates) increased with the lower nutrient concentrations in {B}ouhgrara lagoon. {I}t has been suggested that nutrient changes could drive shifts in ciliate community structure and abundance. {T}he deteriorated water quality of the {G}hannouch coast likely induces the low loricate ciliate abundance and diversity and the higher relative abundance of naked ciliates compared to the less polluted {B}oughrara lagoon.}, keywords = {{B}oughrara lagoon ; {G}hannouch coast ; {P}lanktonic ciliates ; {C}hlorophyll a ; {E}nvironmental parameters ; {TUNISIE} ; {MEDITERRANEE} ; {GABES} {GOLFE} ; {BOUGHRARA} {LAGUNE} ; {GHANNOUCH}}, booktitle = {}, journal = {{R}egional {S}tudies in {M}arine {S}cience}, volume = {45}, numero = {}, pages = {101799 [16 ]}, ISSN = {2352-4855}, year = {2021}, DOI = {10.1016/j.rsma.2021.101799}, URL = {https://www.documentation.ird.fr/hor/{PAR}00022975}, }