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Morpho-physiological adaptations of Leptocylindrus aporus and L. hargravesii to phosphate limitation in the northern Adriatic

Kužat, Nataša; Marić Pfannkuchen, Daniela; Smodlaka Tanković, Mirta; Baričević, Ana; Ivančić, Ingrid; Vrana Špoljarić, Ivna; Gašparović, Blaženka; Pfannkuchen, Martin (2022) Morpho-physiological adaptations of Leptocylindrus aporus and L. hargravesii to phosphate limitation in the northern Adriatic. Scientific reports, 12 . ISSN 2045-2322

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The northern Adriatic is highly productive and shallow area characterized by numerous spatio- temporal gradients (e.g. nutrients, salinity, temperature). It is strongly influenced by numerous freshwater inputs, mainly from Po river. Its current systems as well as Po river, generates gradients of phosphate availability with an expressed N/P imbalance and phosphate limitation. A number of recent studies characterized these gradients as major factors affecting abundance and composition of microphytoplankton communities. Focus of this study is on two Leptocylindrus species, Leptocylindrus aporus (F.W. French & Hargraves) D. Nanjappa & A. Zingone 2013 and Leptocylindrus hargravesii D. Nanjappa & A. Zingone 2013. Species belonging to Leptocylindrus genus are frequently observed and have high abundances and also high contributions to the microphytoplankton community in this area. We focused on their morphological and physiological responses to phosphate limitation in situ and also performed in vitro experiments. In this study we report data on species specific growth rates under phosphorus (P) deplete and P rich conditions, localization and characteristics of alkaline phosphate activity, phosphate uptake rates as well as their morphological differences in P deplete versus P rich conditions. Our in vitro experiments showed that both Leptocylindrus species morphologically reacted similarly to phosphorus depletion and showed significantly elongated pervalvar axis in P depleted conditions if compared to P rich conditions. Also average chain lengths increased when in P depleted conditions. Two previously mentioned adaptations indicate their tendency to increase cellular surface areas available for alkaline phosphatase. Chlorophyll fluorescence of both species significantly decreased in P depleted medium. Although both species morphologically reacted similarly, our experiment demonstrated significant differences in physiological reactions to P depleted conditions.

Item Type: Article
Uncontrolled Keywords: phytoplankton ; Adriatic Sea ; diatoms ; Leptocylindrus ; APA ; P limitation
Subjects: NATURAL SCIENCES > Biology
NATURAL SCIENCES > Interdisciplinary Natural Sciences
Divisions: Center for Marine Research
Division for Marine and Enviromental Research
Project titleProject leaderProject codeProject type
Životne strategije fitoplanktona u sjevernom JadranuPfannkuchen, MartinUIP-2014-09-6563HRZZ
Molekularne životne strategije fitoplanktona u JadranuMarić Pfannkuchen, DanielaUIP-2020-02-7868HRZZ
Utjecaj okolišnog stresa na pojavnost i međudjelovanje biološki važnih organskih molekula i mikronutrijenata u morskom ekosustavuGašparović, BlaženkaIP-2013-11-8607HRZZ
Joint European Research Infrastructure of Coastal Observatories: Science, Service, SustainabilityPfannkuchen, Martin871153EK
MARine Litter cross-borderawarenESS and innovation actionsSmodlaka Tanković, Mirta10253874EK
CoAStal and marine waters integrated monitoring systems for ecosystems proteCtion AnD managemEntMarić Pfannkuchen, Daniela; Ujević, Ivana10255941EK
Climate change information, monitoring and management tools for adaptation stgrategies in Adriatic coastal areasBaričević, Ana; Beg Paklar, Gordana10252001EK
Depositing User: Nataša Kužat
Date Deposited: 10 Mar 2022 12:16
DOI: 10.1038/s41598-022-06062-5

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