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Shifts in microphytoplankton species and cell size at Admiralty Bay, Antarctica

Published online by Cambridge University Press:  13 November 2014

Priscila Kienteca Lange*
Affiliation:
Instituto de Oceanografia, Universidade Federal do Rio Grande (FURG), Laboratório de Fitoplâncton e Microorganismos Marinhos, Avenue Italia, Km 8, Rio Grand 96201-900, Brazil Instituto de Biologia, Universidade Federal do Rio de Janeiro (UFRJ), Avenue Carlos Chagas, 373, Prédio CCS, Bl. A, Ilha do Fundão, Rio de Janeiro 21949-902, Brazil
Denise Rivera Tenenbaum
Affiliation:
Instituto de Biologia, Universidade Federal do Rio de Janeiro (UFRJ), Avenue Carlos Chagas, 373, Prédio CCS, Bl. A, Ilha do Fundão, Rio de Janeiro 21949-902, Brazil
Virgínia Maria Tavano
Affiliation:
Instituto de Oceanografia, Universidade Federal do Rio Grande (FURG), Laboratório de Fitoplâncton e Microorganismos Marinhos, Avenue Italia, Km 8, Rio Grand 96201-900, Brazil
Rodolfo Paranhos
Affiliation:
Instituto de Biologia, Universidade Federal do Rio de Janeiro (UFRJ), Avenue Carlos Chagas, 373, Prédio CCS, Bl. A, Ilha do Fundão, Rio de Janeiro 21949-902, Brazil
Lucia De Siqueira Campos
Affiliation:
Instituto de Biologia, Universidade Federal do Rio de Janeiro (UFRJ), Avenue Carlos Chagas, 373, Prédio CCS, Bl. A, Ilha do Fundão, Rio de Janeiro 21949-902, Brazil

Abstract

Phytoplankton (>15 µm) was investigated in three shallow coastal areas at Admiralty Bay (AB) between the summers of 2002–03 and 2008–09. Phytoplankton abundance was low (103 cells l-1) and, over time, the prevailing cell size decreased due to a shift in phytoplankton dominant species from diatoms to dinoflagellates. In situ and remote sensing data showed that oscillations in sea surface temperature, precipitation, ice formation/melting, irradiance (cloud cover) and bottom circulation (indexed by the Antarctic Oscillation Index; AAO) were shown to govern the structure of the phytoplankton. Under negative AAO, diatoms prevailed, with the dominance of large (>80 µm) benthic diatoms (e.g. Corethron pennatum and Navicula directa) in periods of low production (102 cells l-1 in 2002–03), and medium-sized (31–80 µm) centrics (e.g. Thalassiosira spp. and Stellarima microtrias) when the abundance was higher (104 cells l-1 in 2003–04). Conversely, positive AAO led to the co-dominance of dinoflagellates and planktonic diatoms (e.g. Pseudo-nitzschia spp.) in the summers of 2007–08 and 2008–09. These results suggest that the AAO can be a good predictor of phytoplankton in coastal areas around the western Antarctic Peninsula, and may help our understanding of changes in other trophic levels of the food web.

Type
Biological Sciences
Copyright
© Antarctic Science Ltd 2014 

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