Publication Date:
2024-02-01
Description:
The composition and vertical distribution of planktonic ciliates within the surface layer was monitored over four diel cycles in May 95, during the JGOFS-France DYNAPROC cruise in the Ligurian Sea (NW Mediterranean). Ciliates were placed into size and trophic categories: micro- and nano-heterotrophic ciliates, mixotrophic ciliates, tintinnids and the autotrophic Mesodinium rubrum. Mixotrophic ciliates (micro and nano) represented an average of 46% of oligotrich abundance and 39% of oligotrich biomass; nano-ciliates (hetero and mixotrophic) were abundant, representing about 60 and 17% of oligotrich abundance and biomass, respectively. Tintinnid ciliates were a minor part of heterotrophic ciliates. The estimated contribution of mixotrophs to chlorophyll a concentration was modest, never exceeding 9% in discrete samples. Vertical profiles of ciliates showed that chlorophyll-containing ciliates (mixotrophs and autotrophs) were mainly concentrated and remained at the chlorophyll a maximum depth. In contrast, among heterotrophic ciliates, a portion of the population appeared to migrate from 20-30 m depth during the day to the surface at night or in the early morning. Correlation analyses of ciliate groups and phytoplankton pigments showed a strong relationship between nano-ciliates and zeaxanthin, and between chlorophyll-containing ciliates and chlorophyll a, as well as other pigments that were maximal at the chlorophyll a maximum depth. Total surface layer concentrations showed minima of ciliates during nightime/early morning hours.
Keywords:
Biogeochemical Processes in the Oceans and Fluxes; CTD/Rosette; CTD-RO; DYNAPROC; DYNAPROC_107; DYNAPROC_108; DYNAPROC_109; DYNAPROC_110; DYNAPROC_112; DYNAPROC_113; DYNAPROC_116; DYNAPROC_117; DYNAPROC_119; DYNAPROC_120; DYNAPROC_128; DYNAPROC_129; DYNAPROC_131; DYNAPROC_132; DYNAPROC_133; DYNAPROC_135; DYNAPROC_137; DYNAPROC_139; DYNAPROC_140; DYNAPROC_141; DYNAPROC_248; DYNAPROC_250; DYNAPROC_251; DYNAPROC_252; DYNAPROC_254; DYNAPROC_255; DYNAPROC_257; DYNAPROC_258; DYNAPROC_259; DYNAPROC_260; DYNAPROC_269; DYNAPROC_270; DYNAPROC_272; DYNAPROC_273; DYNAPROC_275; DYNAPROC_276; DYNAPROC_278; DYNAPROC_279; DYNAPROC_281; DYNAPROC_283; JGOFS; Joint Global Ocean Flux Study; Le Suroît; PROOF; SESAME; Southern European Seas: Assessing and Modelling Ecosystem Changes
Type:
Dataset
Format:
application/zip, 40 datasets
Permalink
