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Pregled bibliografske jedinice broj: 590844

Survival mechanisms of phytoplankton in conditions of stratification induced deprivation of orthophosphate: Northern Adriatic case study


Ivančić, Ingrid; Godrijan, Jelena; Pfannkuchen, Martin; Marić, Daniela; Gašparović, Blaženka; Đakovac, Tamara; Najdek, Mirjana
Survival mechanisms of phytoplankton in conditions of stratification induced deprivation of orthophosphate: Northern Adriatic case study // Limnology and oceanography, 57 (2012), 6; 1721-1731 doi:10.4319/lo.2012.57.6.1721 (međunarodna recenzija, članak, znanstveni)


Naslov
Survival mechanisms of phytoplankton in conditions of stratification induced deprivation of orthophosphate: Northern Adriatic case study

Autori
Ivančić, Ingrid ; Godrijan, Jelena ; Pfannkuchen, Martin ; Marić, Daniela ; Gašparović, Blaženka ; Đakovac, Tamara ; Najdek, Mirjana

Izvornik
Limnology and oceanography (0024-3590) 57 (2012), 6; 1721-1731

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
APA ; phytoplankton ; lipids

Sažetak
Phytoplankton abundance in the northern Adriatic during the summer 2008 indicated that the system was highly productive, in spite of low orthophosphate (PO4) concentrations. Mechanisms by which phytoplankton adapted to PO4 deprivation during the summer stratification were studied. In upper, more productive waters phytoplankton induced high alkaline phosphatase activity (APA) to obtain phosphorus from the dissolved organic pool, and the P turnover time mediated by phytoplankton APA was very short (2 min-1.5 h). High affinity enzymatic activity combined with high hydrolysis rates enabled metabolic flexibility to the phytoplankton in this heterogeneous and fluctuating environment. Another possible mechanism of adaptation to the PO4 deficit during the summer was a shift towards smaller cells. The smaller nanophytoplankton, supported by higher surface:volume ratios, is presumably able to produce more alkaline phosphatase, an exoenzyme bound to the cell surface. Progressive decrease of large cells and increase of smaller cells in the phytoplankton community during summer supported this hypothesis. In upper waters with low PO4 concentrations, phytoplankton reduced their P demand by a preferential synthesis of non phospholipids. In bottom waters phytoplankton abundance was markedly lower than in upper waters and growth was probably light limited. In these deeper waters with higher PO4 concentrations, phytoplankton did not use APA to obtain phosphorus and able to synthesize more phospholipids. In deeper waters growth of bigger cells was favored.

Izvorni jezik
Engleski

Znanstvena područja
Geologija



POVEZANOST RADA


Projekt / tema
098-0982705-2729 - Struktura i fiziologija mikrobnih zajednica frontalnih zona sjevernog Jadrana (Mirjana Najdek-Dragić, )
098-0982705-2731 - Mehanizam dugoročnih promjena u ekosustavu sjevernog Jadrana (Robert Precali, )
098-0982934-2717 - Priroda organske tvari, interakcije s mikrokonstituentima i površinama u okolišu (Irena Ciglenečki-Jušić, )

Ustanove
Institut "Ruđer Bošković", Zagreb

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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