Data/hora: 06/06/2024 18:21:00

Provedor de dados: 	5	
País: 	France	
Título: 	Physiological and behavioral responses of phytoplankton communities to nutrient availability in a disturbed Mediterranean coastal lagoon	
Autores: 	Leruste, A.; Pasqualini, V.; Garrido, M.; Malet, Nathalie; De Wit, R.; Bec, Beatrice.	
Data: 	2019-04	
Ano: 	2019	
Palavras-chave: 	Growth rate; Dilution experiment; Eutrophication; Functional traits.	
Resumo: 	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.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	https://archimer.ifremer.fr/doc/00481/59238/61948.pdf

DOI:10.1016/j.ecss.2019.02.014

https://archimer.ifremer.fr/doc/00481/59238/	
Editor: 	Elsevier BV	
Formato: 	application/pdf	
Fonte: 	Estuarine Coastal And Shelf Science (0272-7714) (Elsevier BV), 2019-04 , Vol. 219 , P. 176-188	
Fonte: 	info:eu-repo/semantics/openAccess

restricted use