Size-fractionated chlorophyll a and phycocyanin temporal variations in a highly eutrophic lake and its isolated karstic springs

Stephania L. Tsola, Christina Renta, Sofia C. Macingo, Hera Karayanni

Phycocyanin concentration at Sites 1 (Lake) and 2 (Springs) between August 2016 and January 2017

Paper category: Original research paper
Corresponding author: Hera Karayanni (hkaray@cc.uoi.gr)
DOI: 10.1515/ohs-2018-0013
Received: September 26, 2017
Accepted: December 8, 2017
Full text: here

Abstract

Monthly variations of size-fractionated chlorophyll a and phycocyanin were studied in Lake Pamvotis between August 2016 and January 2017. Sampling was conducted at two sampling sites: in the main lake (Site 1: Lake) and in an adjacent man-made water ski lake with karstic springs (Site 2: Springs). Samples were fractionated into three size classes: 0.2–2 μm (pico), 2–20 μm (nano) and 20–180 μm (micro). According to chlorophyll a values, eutrophic to hypereutrophic conditions prevail at Site 1 and oligotrophic to mesotrophic conditions – at Site 2. Similarly, Site 1 was distinguished by higher concentration of phycocyanin compared to Site 2. Fractionated chlorophyll a showed monthly variations at Site 1 with alternations in the dominance between the two larger fractions. The maximum of the 0.2–2 μm fraction was observed in October but it contributed less to the total chlorophyll a content than nano- or microphytoplankton. Its contribution was higher at Site 2, reaching occasionally ~ 40% of the bulk chlorophyll a. However, nanophytoplankton was the fraction found to respond faster when disturbances occurred. At Site 1, phycocyanin correlated well with total chlorophyll a as well as with the micro- and nanophytoplankton fractions, indicating that cyanobacteria represent an important component of the large-sized phytoplankton in Lake Pamvotis.

Department of Biological Applications and Technology, University of Ioannina, 45100 Ioannina, Greece
Department of Biological Applications and Technology, University of Ioannina, 45100 Ioannina, Greece
Department of Biological Applications and Technology, University of Ioannina, 45100 Ioannina, Greece
Department of Biological Applications and Technology, University of Ioannina, 45100 Ioannina, Greece

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