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Phenotypic variation and adaptive strategies in calcifying marine phytoplankton (Coccolithophores)
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Uppsala universitet, 2015.
National Category
Ecology Evolutionary Biology Cell Biology
Identifiers
URN: urn:nbn:se:uu:diva-253357OAI: oai:DiVA.org:uu-253357DiVA: diva2:814297
Presentation
2015-04-24, Hambergsalen, Villavägen 16, Uppsala, 15:34 (English)
Opponent
Available from: 2015-06-02 Created: 2015-05-26 Last updated: 2016-02-09Bibliographically approved
List of papers
1. Eco-physiological adaptation shapes the response of calcifying algae to nutrient limitation
Open this publication in new window or tab >>Eco-physiological adaptation shapes the response of calcifying algae to nutrient limitation
2015 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 5, 16499Article in journal (Refereed) Published
Abstract [en]

The steady increase in global ocean temperature will most likely lead to nutrient limitation in the photic zone. This will impact the physiology of marine algae, including the globally important calcifying coccolithophores. Understanding their adaptive patterns is essential for modelling carbon production in a low-nutrient ocean. We investigated the physiology of Helicosphaera carteri, a representative of the abundant but under-investigated flagellated functional group of coccolithophores. Two strains isolated from contrasting nutrient regimes (South Atlantic and Mediterranean Sea) were grown in phosphorus-replete and phosphorus-limited batch cultures. While growing exponentially in a phosphorus-replete medium, the Mediterranean strain exhibited on average 24% lower growth rate, 36% larger coccosphere volume and 21% lower particulate inorganic carbon (PIC) production than the Atlantic strain. Under phosphorus limitation, the same strain was capable of reaching a 2.6 times higher cell density than the Atlantic strain due to lower phosphorus requirements. These results suggest that local physiological adaptation can define the performance of this species under nutrient limitation.

National Category
Ecology Cell Biology Evolutionary Biology Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:uu:diva-253354 (URN)10.1038/srep16499 (DOI)000364487200001 ()26560531 (PubMedID)
Funder
Knut and Alice Wallenberg FoundationThe Royal Swedish Academy of Sciences
Available from: 2015-05-26 Created: 2015-05-26 Last updated: 2017-12-04Bibliographically approved
2. High temperature decreases the PIC/POC ratio and increases phosphorus requirements in Coccolithus pelagicus (Haptophyta)
Open this publication in new window or tab >>High temperature decreases the PIC/POC ratio and increases phosphorus requirements in Coccolithus pelagicus (Haptophyta)
Show others...
2014 (English)In: Biogeosciences, ISSN 1726-4170, E-ISSN 1726-4189, Vol. 11, 3531-3545 p.Article in journal (Refereed) Published
Abstract [en]

Rising ocean temperatures will likely increase stratification of the water column and reduce nutrient input into the photic zone. This will increase the likelihood of nutrient limitation in marine microalgae, leading to changes in the abundance and composition of phytoplankton communities, which in turn will affect global biogeochemical cycles. Calcifying algae, such as coccolithophores, influence the carbon cycle by fixing CO2 into particulate organic carbon through photosynthesis (POC production) and into particulate inorganic carbon through calcification (PIC production). As calcification produces a net release of CO2, the ratio of PIC to POC production determines whether coccolithophores act as a source (high PIC / POC) or a sink (low PIC / POC) of atmospheric CO2. We studied the effect of phosphorus (P-) limitation and high temperature on the physiology and the PIC / POC ratio of two subspecies of Coccolithus pelagicus. This large and heavily calcified species is a major contributor to calcite export from the photic zone into deep-sea reservoirs. Phosphorus limitation did not influence exponential growth rates in either subspecies, but P-limited cells had significantly lower cellular P-content. One of the subspecies was subjected to a 5 °C temperature increase from 10 °C to 15 °C, which did not affect exponential growth rates either, but nearly doubled cellular P-content under both high and low phosphate availability. This temperature increase reduced the PIC / POC ratio by 40–60%, whereas the PIC / POC ratio did not differ between P-limited and nutrient-replete cultures when the subspecies were grown near their respective isolation temperature. Both P-limitation and elevated temperature significantly increased coccolith malformations. Our results suggest that a temperature increase may intensify P-limitation due to a higher P-requirement to maintain growth and POC production rates, possibly reducing abundances in a warmer ocean. Under such a scenario C. pelagicus may decrease its calcification rate relative to photosynthesis, thus favouring CO2 sequestration over release. It seems unlikely that P-limitation by itself causes changes in the PIC / POC ratio in this species.

Keyword
coccolithophores, culture experiments, phosphate limitation, calcification
National Category
Natural Sciences
Research subject
Biology; Earth Science with specialization in Environmental Analysis
Identifiers
urn:nbn:se:uu:diva-220830 (URN)10.5194/bg-11-3531-2014 (DOI)000339265800008 ()
Available from: 2014-03-20 Created: 2014-03-20 Last updated: 2017-12-05Bibliographically approved
3. Observations on the life cycle and ecology of Acanthoica quattrospina Lohmann from a Mediterranean estuary
Open this publication in new window or tab >>Observations on the life cycle and ecology of Acanthoica quattrospina Lohmann from a Mediterranean estuary
2014 (English)In: Journal of Nannoplankton Research, ISSN 1210-8049, Vol. 34, no SI, 49-56 p.Article in journal (Refereed) Published
National Category
Ecology Biological Systematics
Identifiers
urn:nbn:se:uu:diva-253353 (URN)
Conference
INA Workshop on Extant Coccolithophores research
Available from: 2015-05-26 Created: 2015-05-26 Last updated: 2016-09-13Bibliographically approved

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