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Effects of episodic nutrients enrichments on P-limited planktonic communities: Lake Redon ENEX 2013 experiment

Citation

Catalan, Jordi et al. (2021), Effects of episodic nutrients enrichments on P-limited planktonic communities: Lake Redon ENEX 2013 experiment, Dryad, Dataset, https://doi.org/10.5061/dryad.tx95x69vh

Abstract

Planktonic communities are naturally subjected to episodic nutrient enrichments that may stress or redress the imbalances in limiting nutrients. Human-enhanced atmospheric nitrogen deposition has caused profound N:P imbalance in many remote oligotrophic lakes in which phosphorus has largely become limiting. These lakes offer an opportunity to investigate the planktonic community response to nutrient fluctuations in P-limited conditions. The ENEX experiment in Lake Redon (Pyrenees), performed during August 2013, aimed to investigate the structural and stoichiometric effects of pulse nutrient additions on P-limited planktonic communities. We performed P (PO43-), and N (NH4+ or NO3-) additions to the summer epilimnetic community of the ultraoligotrophic lake using self-filling ~100 L enclosures and analysed the response to varying P availability, N:P imbalance, and N source. The nutrient additions were gradients within the range of values seasonally found in the lake and other oligotrophic lakes of the Pyrenees, with a further P level typical of mesotrophic lakes to provided non-limiting conditions.

Methods

Analytical methods are described in the associated publication:

Giménez-Grau, P., Felip, M., Zufiaurre, A., Pla-Rabès, S., Camarero, L. & Catalan, J. (2020) Homeostasis and non-linear changes in the stoichiometry of P limited planktonic communities. Ecosphere,11:e03249

Usage Notes

 Initial reference conditions in the lake water column were sampled during three dates. They are reported separately, but they should be amalgamated if used as initial experimental conditions. There are a few missing values across the biogeochemical data. Data from the enclosure water column and the sediment traps are reported in separated files.

Funding

Ministerio de Ciencia e Innovación, Award: CGL2010–19737

Ministerio de Ciencia e Innovación, Award: CGL2016–80124-C2-1-P

Generalitat de Catalunya, Award: 2017 SGR 910

Ministerio de Ciencia e Innovación, Award: FPI BES-2014-070196

Ministerio de Educación, Cultura y Deporte, Award: FPU AP2010-3596