Phytoplankton composition and bloom formation in unexplored nearshore waters of the western Antarctic Peninsula
| Autor: | Maria Vernet, Allison Cusick, Adrián Oscar Cefarelli, Gaston Osvaldo Almandoz, Martina Mascioni, Martha E. Ferrario |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Western Antarctic Peninsula Diatoms geography geography.geographical_feature_category Citizen Science 010604 marine biology & hydrobiology Ecology (disciplines) Pyramimonas sp Biology 010603 evolutionary biology 01 natural sciences Oceanography Peninsula Phytoplankton composition Unarmored dinofagellate bloom Cryptophyta Ciencias Naturales General Agricultural and Biological Sciences Bloom |
| Zdroj: | SEDICI (UNLP) Universidad Nacional de La Plata instacron:UNLP |
| Popis: | The western Antarctic Peninsula (WAP) is one of the most productive regions in the Southern Ocean. However, little is known about the phytoplankton composition in nearshore waters, in fords and channels between 63º and 67°S, where Antarctic krill and baleen whales are conspicuous. This study represents the frst attempt to describe spatial and temporal composition of the phytoplankton community (species, cell concentration, phytoplankton biomass) in twelve relatively unexplored nearshore sites of the WAP. Sampling was carried out in the frame of a Citizen Science project during late summer of 2016 and during the spring–summer 2016–2017. Species identifcation and enumeration were performed by light and scanning electron microscopy and phytoplankton carbon biomass was estimated by using cell-volume conversion. The highest phytoplankton abundance and biomass values were found in December-January, and were mainly represented by nanophytofagellates (2–20 µm). Cryptophytes were more abundant in early summer and prasinophyceans in late summer. The abundance of large bloom-forming diatoms was unexpectedly low. Three blooming fagellated taxa were found during the sampling season, chronologically: Pyramimonas sp. in Neko Harbor (March 3, 2016, 1.4×106 cells L−1, and 327 µgC L−1), cryptophytes in Wilhelmina Bay (December 14, 2016, 6.4×106 cells L−1, and 97.5 µgC L−1) and unidentifed unarmored dinofagellates near Danco Island (December 18, 2016, 9.5×106 cells L−1, and 1597 µgC L−1). The last one represents, as far as we know, the frst record of a dinofagellate bloom in the WAP. It is to note that blooming organisms, analyzed morphologically, do not coincide with previously described Antarctic species. Facultad de Ciencias Naturales y Museo |
| Databáze: | OpenAIRE |
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