Impact of nutrient availability on the trophic strategies of the planktonic protist communities in a disturbed Mediterranean coastal lagoon

Type Article
Date 2021-03
Language English
Author(s) Leruste Amandine1, 2, Garrido Marie3, Malet NathalieORCID4, Bec Beatrice2, de Wit Rutger2, Cecchi Philippe2, 5, Pasqualini VaninaORCID1
Affiliation(s) 1 : UMR SPE CNRS/UMS Stella Mare CNRS, Université de Corse, 20250, Corte, France
2 : MARBEC, Univ Montpellier, CNRS, Ifremer, IRD, Montpellier, France
3 : Environmental Agency of Corsica, 7 Avenue Jean Nicoli, 20250, Corte, France
4 : Ifremer, Laboratoire Environnement Ressources Provence-Azur-Corse (LER/PAC), Station de Bastia, Z.I. Furiani, Immeuble Agostini, 20600, Bastia, France
5 : Centre de Recherches Océanologiques, CRO, Abidjan, Ivory Coast
Source Hydrobiologia (0018-8158) (Springer Science and Business Media LLC), 2021-03 , Vol. 848 , N. 5 , P. 1101-1119
DOI 10.1007/s10750-021-04517-w
WOS© Times Cited 2
Keyword(s) Growth rate, Dinoflagellates, Nutrient limitation, Mixotrophy

The impact of changes in nitrogen (N) and phosphorus (P) availability on the trophic strategies of planktonic protists was evaluated in a disturbed Mediterranean lagoon (Biguglia lagoon, France) using short-term bioassays. Natural communities were collected in three periods, i.e., autumn, spring and summer, to address the influence of the different environmental conditions. The responses of autotrophic plankton communities to experimentally induced N and/or P limitations were assessed as changes in chlorophyll a (Chl a) concentrations and in the abundances of potentially mixotrophic protists taxa. We observed blooms (> 105 cells l−1) of nanoflagellates in autumn, and of phycocyanin-rich picocyanobacteria in summer. Communities showed a co-limitation by N and P at the three sampling periods, despite high N:P ratios in autumn and spring. The high abundances of potentially mixotrophic dinoflagellates during these periods suggest the involvement of alternative trophic pathways for their maintenance in the lagoon. After bioassay incubations using different nutrient enrichment treatments, we often observed reduced abundances of mixotrophic protists containing Chl a with a concomitant increased abundance of protists without Chl a. This indicates a loss of chloroplasts and photoautotrophic abilities in protists cells, possibly reflecting a shift towards heterotrophy that could be sustained by phagotrophy.

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Leruste Amandine, Garrido Marie, Malet Nathalie, Bec Beatrice, de Wit Rutger, Cecchi Philippe, Pasqualini Vanina (2021). Impact of nutrient availability on the trophic strategies of the planktonic protist communities in a disturbed Mediterranean coastal lagoon. Hydrobiologia, 848(5), 1101-1119. Publisher's official version : , Open Access version :