Mixing Processes at the Pycnocline and Vertical Nitrate Supply: Consequences for the Microbial Food Web in San Jorge Gulf, Argentina

Dynamics of Macronutrients in the San Jorge Gulf During Spring and Summer

“…These concentrations are significantly lower than those observed at the surface, indirectly indicating the low biomass of phytoplankton that is typical of those depths where, although there are available nutrients (Figure 1), sunlight and grazing pressure limit the growth of these microorganisms. The depth of the euphotic zone in summer was estimated between 20 m and 40 m and coincided with the location of the pycnocline (Latorre et al, 2018, in this issue). Additionally, according to the Lee et al (2007) algorithm, and monthly euphotic zone data from https://giovanni.gsfc.…”

Composition, Spatial Distribution, and Trophic Structure of the Zooplankton Community in San Jorge Gulf, Southwestern Atlantic Ocean

“…This hypothesis is supported by Video Plankton Recorder images obtained and analyzed during the cruise, which show the presence of abundant marine snow. In contrast, diatoms and dinoflagellates dominated the micro-autotroph community in the South, whereas diatoms were mostly absent in the Center and North (Latorre et al, 2018, in this issue). These differences in algal distribution between the three zones might also be responsible for the differences found in POM stable isotope signatures that showed general enrichment in δ 13 C and depletion in δ 15 N when diatoms were present.…”

Using Landsat Image Series to Identify and Characterize Persistent Oceanographic Structures in a Dynamic Marine Protected Area (North of San Jorge Gulf, Argentinian Patagonia)

“…Because of its ecological relevance and high dynamism, this area has been previously studied from different perspectives: seabirds and marine mammals communities [37,[39][40][41], bottom characterization (Sánchez-Carnero et al, 2020 [42]), biological and chemical oceanography [43][44][45][46][47][48], physical oceanography [45,[49][50][51], even submesoscale processes characterization [32,36]. However, due to its large size, no systematic study of the submesoscale processes of the entire protected area of the northern San Jorge Gulf has been carried out so far.…”