Phytoplankton functional groups in the Northern Humboldt Current Ecosystem (NHCE)
DOI:
https://doi.org/10.53554/boletin.v37i1.358Keywords:
Fitoplancton, Ecosistema, Corriente de HumboldtAbstract
The Northern Humboldt Current ecosystem (NHCE), located in the southeastern Pacific off Peru, is one of the most productive natural systems worldwide. This area is of great relevance for the study of phytoplankton as the basis of the marine trophic web. Based on the relationships between the cell surface area, biovolume, and maximum linear dimension of the cells of the phytoplankton species, we found 140 species in the functional group ‘R’ (ruderal species, which are adaptable to high mixing conditions); 133 species in functional group ‘S’ (Stress-tolerant species, predominant in oligotrophic and high light conditions),
and 19 species in functional group ‘C’ (colonizing, opportunistic species, predominant in mesotrophic and high light conditions). These three functional groups (FGs) are respectively formed by elongated, pennate, and chain-forming diatoms (group R); dinoflagellates, large central diatoms, and silicoflagellates (group S), and coccolithophores, some mixotrophic dinoflagellates, and phytoflagellates (group C). The percentages of coincidence between the morphometric classification of the FGs of this study and the ecological classification were between 52% and 90%. We propose the use of FGs to evaluate the spatio-temporal variations of phytoplankton and its relation with environmental conditions in the NHCE, whose turbulence levels are
lower than those recorded in Chilean fjords.
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