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Insights into the life strategy of the common marine diatom Chaetoceros peruvianus Brightwell

Smodlaka Tanković, Mirta; Baričević, Ana; Ivančić, Ingrid; Kužat, Nataša; Medić, Nikola; Pustijanac, Emina; Novak, Tihana; Gašparović, Blaženka; Marić Pfannkuchen, Daniela; Pfannkuchen, Martin (2018) Insights into the life strategy of the common marine diatom Chaetoceros peruvianus Brightwell. PLoS One, 1 . ISSN 1932-6203

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Chaetoceros peruvianus is a marine diatom species with circumglobal distribution. While frequently observed, it appears never to dominate the marine phytoplankton community hence it can be characterized as a rather opportunistic, generalistic species. Here we present ecological interpretations from a long-term data set on marine microphytoplankton in the northern Adriatic Sea, where the abundancies and relative contributions of C. peruvianus were observed along a set of steep ecological gradients. Limited supply of dissolved inorganic phosphate was identified as the driving ecological factor for this ecosystem. In parallel C. peruvianus was cultivated in monoclonal cultures and its morphological and physiological reaction to replete and phosphorus depleted medium was analysed. C. peruvianus reacted to phosphorus depletion by an increase in cell height and length as well as thickness and length of setae. This morphological reaction included an increase in cellular volume and calculated carbon content. Additionally, it represents the transition between two described morphological varieties, C. peruvianus and C. peruvianus var. robusta. C. peruvianus showed a significant induction of extracellular alkaline phosphatase activity if grown in phosphate depleted medium. Microscopical analysis demonstrated this activity to be located exclusively on the setae of the cells.

Item Type: Article
Uncontrolled Keywords: phytoplankton ; Adriatic Sea ; diatoms ; Chaetoceros peruvianus ; APA ; P limitation
Subjects: NATURAL SCIENCES > Biology
Divisions: Center for Marine Research
Division for Marine and Enviromental Research
Project titleProject leaderProject codeProject type
Utjecaj okolišnog stresa na pojavnost i međudjelovanje biološki važnih organskih molekula i mikronutrijenata u morskom ekosustavu-AMBIOMERESBlaženka GašparovićIP-2013-11-8607HRZZ
Životne strategije fitoplanktona u sjevernom Jadranu-P-limitAndreas Pfannkuchen MartinUIP-2014-09-6563HRZZ
Depositing User: Blaženka Gašparović
Date Deposited: 19 Oct 2018 11:27
DOI: 10.1371/journal.pone.0203634

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