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Metal to phosphorus stoichiometries for freshwater phytoplankton in three remote lakes

Douglas, Richard (2016) Metal to phosphorus stoichiometries for freshwater phytoplankton in three remote lakes. PeerJ, 4 . [Journal article]

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URL: https://doi.org/10.7717/peerj.2749

DOI: 10.7717/peerj.2749

Abstract

Simultaneous measurements of changes in phytoplankton biomass and the metal and phosphorus (P) content of cells have been captured to attest to metal to P stoichiometries for freshwater phytoplankton. Three Scottish lakes that had received high, medium or low metal contamination from the atmosphere were selected for study. Phytoplankton cells were collected and Inductively Coupled Plasma -Mass Spectrometry was used to measure their lead (Pb), cadmium (Cd), mercury (Hg), copper (Cu), zinc (Zn), nickel (Ni), chromium (Cr), manganese (Mn), cobalt (Co) and P content. Increased phytoplankton growth in the lakes resulted in significant algae growth dilution of the mass -specific Pb, Cd, Hg, Cu, Ni and Cr in the phytoplankton. Changes in the phytoplankton cell count and their Hg, Pb, Cd, Cu, Mn, Co, Ni and Cr concentrations showed the process of algae bloom dilution to be subject to exponential decay, which accelerated in the order of Mn < Cu < Ni < Pb and Cd < Cr and Hg < Co. This indicated a metabolic and detoxification mechanism was involved in the active selection of metals. For the first time simultaneous measurements of metals and P stoichiometry in freshwater phytoplankton are reported. The mean metal to P stoichiometry generated was (C106P1N16)(1000)Pb0.019Hg0.00004.CU0.013 Cd-0.005 Cr0.2CO0.0008 Mn0.2Ni0.012 based on field measurements and the Redfield average C, N and P stoichiometry of (CH2O)(106)(NH3)(16)H3PO4.

Item Type:Journal article
Keywords:Metal, Phytoplankton, Phosphorus, Freshwater, Lakes, Stoichiometries, Scotland
Faculties and Schools:Faculty of Life and Health Sciences > School of Geography and Environmental Sciences
Faculty of Life and Health Sciences
Research Institutes and Groups:Environmental Sciences Research Institute
Environmental Sciences Research Institute > Freshwater Sciences
ID Code:36852
Deposited By: Dr Richard Douglas
Deposited On:28 Feb 2017 07:24
Last Modified:17 Oct 2017 16:27

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