Picoplankton distribution influenced by thermohaline circulation in the southern Adriatic
Autor: | Mirna Batistić, Iris Dupčić Radić, Mirjana Najdek, Tina Šilović, Enis Hrustić, Hrvoje Mihanović |
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Rok vydání: | 2018 |
Předmět: |
0301 basic medicine
Picoplankton Procholorococcus Synechococcus Deep water convection Adriatic Sea Physical-biological coupling Levantine Intermediate Water 010504 meteorology & atmospheric sciences biology Geology Aquatic Science Oceanography biology.organism_classification Saline water 01 natural sciences Salinity 03 medical and health sciences 030104 developmental biology Nutrient Abundance (ecology) Environmental science Thermohaline circulation 14. Life underwater Prochlorococcus 0105 earth and related environmental sciences |
Zdroj: | Continental Shelf Research. 155:21-33 |
ISSN: | 0278-4343 |
Popis: | In this study, we focus on the interactive dynamics between physico-chemical processes and picoplankton distribution in order to advance our current understanding of the roles of various parameters in regulating picoplankton community structure in highly dynamic marine system such as the South Adriatic Sea. The research was carried out between October 2011 and September 2012 along the transect in the northern part of the South Adriatic Pit. The deep water convection occurred in the southern Adriatic during February 2012, with vertical mixing reaching the depth of 500 m. The picoplankton community was highly affected by this mixing event, whilst its compartments each responded differently. During deep water convection low nucleic acid heterotrophic bacteria (LNA HB) and Synechococcus had their lowest abundances (4 × 105 cell ml−1 and 8 × 102 cell ml−1, respectively), picoeucaryotes had their highest abundances (104 cell ml−1), while Prochlorococcus was absent from the area, most likely due to intense cooling and vertical mixing. In March 2012 Eastern Adriatic Current (EAC) brought warm and saline water with more nutrients, which resulted in the proliferation of high nucleic acid heterotrophic bacteria (HNA HB), having maximal abundance (4 × 105 cell ml−1). The re-establishment of Levantine Intermediate Water (LIW) intrusion after the deep water convection resulted in the re-appearance of Prochlorococcus and maximal abundances of Synechococcus (4 × 104 cell ml−1) in May 2012. The distribution of picoheterotrophs was mainly explained by the season, while the distribution of picophytoplankton was explained by the depth. Aside from nutrients, salinity was an important parameter, affecting particularly Prochlorococcus. The re-appearance of Prochlorococcus in the southern Adriatic during the period of LIW intrusion, together with their correlation with salinity, indicates their potential association with LIW. The relationship between Prochloroccocus distribution and physico-chemical environmental parameters provides an important insight into the ecological roles and niche preferences of this group. |
Databáze: | OpenAIRE |
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