Environmental dependence of the correlations between stoichiometric and fatty acid-based indicators of phytoplankton nutritional quality.

Bi, Rong, Ismar, Stefanie M. H., Sommer, Ulrich and Zhao, Meixun (2017) Environmental dependence of the correlations between stoichiometric and fatty acid-based indicators of phytoplankton nutritional quality. Limnology and Oceanography, 62 (1). pp. 334-347. DOI 10.1002/lno.10429.

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Abstract

Marine phytoplankton is simultaneously affected by multiple environmental drivers. To-date integrative assessments of multiple combined effects are rare on the relationship between elemental stoichiometry and biochemicals in marine phytoplankton. We investigated responses of stoichiometric (N:C and P:C ratios) and fatty acid-based (polyunsaturated fatty acid, PUFA) indicators of nutritional quality to three N:P supply ratios (10:1, 24:1, and 63:1 mol mol−1), three temperatures (12, 18, and 24°C) and two pCO2 levels (560 and 2400 μatm) in the marine phytoplankters Rhodomonas sp. and Phaeodactylum tricornutum. Overall, warming and nutrient deficiency showed dramatic effects, but increased pCO2 had modest effects on the two indicators of nutritional quality. Specifically, warming showed strong positive effects on N:C and P:C ratios in Rhodomonas sp. but negative effects on PUFAs in both species. The low N- and low P-media led to low contents of both nutrients but high contents of PUFAs in the biomass of Rhodomonas sp., while the response of P. tricornutum was more complex: N:C ratios were lowest at the intermediate N:P supply but P:C ratios responded negatively to P deficiency and positively to N deficiency. Large variations in the two indicators of nutritional quality can be attributed to species-specific physiological optima and interactions between the three manipulated variables. Our results suggest that stoichiometric and FA-based indicators of nutritional quality may change differentially in response to warming and nutrient deficiency in marine phytoplankton, highlighting the relevance of simultaneous considerations of the two indicators of nutritional quality, when assessing food web dynamics under future ocean scenarios.

Document Type: Article
Keywords: Algae; C:N:P stoichiometry; PUFAs; warming; nutrients; CO2
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-N Experimental Ecology - Food Webs
Kiel University
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1002/lno.10429
ISSN: 0024-3590
Projects: Future Ocean
Date Deposited: 23 Sep 2016 06:52
Last Modified: 06 Feb 2020 09:04
URI: http://oceanrep.geomar.de/id/eprint/33995

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