Effect of phosphorus limitation on calcification and element ratios in Mediterranean strains of the coccolithophore Emiliania huxleyi

A. Oviedo, G. Langer, P. Ziveri

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Six Emiliania huxleyi strains isolated in the Mediterranean Sea were grown under phosphorus limitation and replete (control) conditions in batch culture. We tested the hypothesis that increasing phosphorus limitation, resulting from ocean warming, will affect coccolithophores and change their contribution to the PIC:POC ratios. Four strains were isolated in the oligotrophic Algerian basin (western Mediterranean), and two strains in the extremely oligotrophic and often phosphorus depleted Levantine basin (eastern Mediterranean). Samples for particulate inorganic carbon, PIC; particulate organic carbon, POC; particulate organic phosphorus, POP; and total particulate nitrogen, TPN, were taken at equal cell densities in phosphorus limited and control culture conditions (harvesting in exponential and stationary phases respectively). Different morphological features of coccoliths were analyzed. Phosphorus limitation was inferred from: 1. a decrease in growth rate between 22% and 34% compared to phosphorus replete cultures; 2. a reduction in final cell density from ca. 2×10
Original languageEnglish
Pages (from-to)105-113
JournalJournal of Experimental Marine Biology and Ecology
Volume459
DOIs
Publication statusPublished - 2014

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