Physiological and behavioral responses of phytoplankton communities to nutrient availability in a disturbed Mediterranean coastal lagoon

Type Article
Date 2019-04
Language English
Author(s) Leruste A.1, 2, Pasqualini V.1, Garrido M.1, 3, Malet NathalieORCID4, De Wit R.2, Bec Beatrice2
Affiliation(s) 1 : UMR SPE CNRS/UMS Stella Mare CNRS, Université de Corse, 20250, Corte, France
2 : MARine Biodiversity Exploitation and Conservation MARBEC, Université de Montpellier, IRD, Ifremer, CNRS. Bât. 24, Place Eugène Bataillon, 34095, Montpellier cedex 5, France
3 : Environmental Agency of Corsica, 7 Avenue Jean Nicoli, 20250, Corte, France
4 : Ifremer, Laboratoire Environment Resources Provence-Azur-Corse (LER/PAC), Station de Bastia, Z.I. Furiani, Immeuble Agostini, 20600, Bastia, France
Source Estuarine Coastal And Shelf Science (0272-7714) (Elsevier BV), 2019-04 , Vol. 219 , P. 176-188
DOI 10.1016/j.ecss.2019.02.014
WOS© Times Cited 6
Keyword(s) Growth rate, Dilution experiment, Eutrophication, Functional traits
Abstract

Short-term bioassays were conducted in Biguglia lagoon (Corsica) to study the physiological and behavioral responses of phytoplankton to N- and P-availability. Natural communities were collected in two stations representative of the two sub-basins, at three periods with contrasting environmental characteristics to address the impact of seasonal variability. These samples were separately enriched with a full N and P enrichment, and with enrichments minus N or minus P. Phytoplankton size structuration, diversity, and growth of the total phytoplankton, the micro-, nano- and ultraphytoplankton were evaluated using spectrofluorimetry, and optical microscopy. Results showed that the communities were fueled by NO3− in the wet periods (autumn and spring) and NH4+ in summer. The phytoplankton communities displayed highest cell size in autumn, with high abundances of nanoflagellates, and smallest cell size in summer with a large dominance of phycocyanin-rich picocyanobacteria. Blooms of dinoflagellates also occurred during the wet periods, coinciding with high N:P ratios. The full enrichment has not stimulated phytoplankton growth in autumn, suggesting the importance of other controlling factors such as light, a possible NH4+ inhibition or the use of mixotrophic abilities. In spring, communities have displayed single P-limitation in the northern basin and different N and P co-limitations in the southern basin. In summer, the full enrichment consistently stimulated the growth of all cell sizes. The communities showed high N and P co-limitations, which is consistent with growing observations in aquatic ecosystems, and reflects the different functional responses of phytoplankton communities to the nutrient availability.

Full Text
File Pages Size Access
Author's final draft 55 4 MB Open access
4 979 KB Access on demand
3 301 KB Access on demand
13 1 MB Access on demand
Top of the page

How to cite 

Leruste A., Pasqualini V., Garrido M., Malet Nathalie, De Wit R., Bec Beatrice (2019). Physiological and behavioral responses of phytoplankton communities to nutrient availability in a disturbed Mediterranean coastal lagoon. Estuarine Coastal And Shelf Science, 219, 176-188. Publisher's official version : https://doi.org/10.1016/j.ecss.2019.02.014 , Open Access version : https://archimer.ifremer.fr/doc/00481/59238/