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| Leruste, A.; Pasqualini, V.; Garrido, M.; Malet, Nathalie; De Wit, R.; Bec, Beatrice. |
| 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+... |
| Tipo: Text |
Palavras-chave: Growth rate; Dilution experiment; Eutrophication; Functional traits. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00481/59238/61948.pdf |
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| Leruste, A.; Villeger, S.; Malet, Nathalie; De Wit, R.; Bec, B.. |
| We used the individual-based multidimensional functional diversity and the taxonomic approaches in a complementary way to describe phytoplankton communities in three coastal lagoons with different eutrophication status in the South of France. We sampled communities during three seasons, i.e., in autumn, spring, and summer. Using classical taxonomy, 107 taxa/morphotypes were identified in the nine communities. The individual-based functional approach allowed grouping these individuals into 20 functional entities according to their values for 5 traits related to trophic adaptations (cell size, mobility, trophic regime, coloniality, and pelagic/benthic life). Some species (e.g., Prorocentrum micans) emerged in multiple functional entities, showing the... |
| Tipo: Text |
Palavras-chave: Classification; Functional entity; Functional traits; Taxonomic diversity. |
| Ano: 2018 |
URL: http://archimer.ifremer.fr/doc/00433/54454/55826.pdf |
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| Leruste, A.; Malet, Nathalie; Munaron, Dominique; Derolez, Valerie; Hatey, E.; Collos, Y.; De Wit, R.; Bec, B.. |
| Along the French Mediterranean coast, a complex of eight lagoons underwent intensive eutrophication over four decades, mainly related to nutrient over-enrichment from continuous sewage discharges. The lagoon complex displayed a wide trophic gradient from mesotrophy to hypertrophy and primary production was dominated by phytoplankton communities. In 2005, the implementation of an 11 km offshore outfall system diverted the treated sewage effluents leading to a drastic reduction of anthropogenic inputs of nitrogen and phosphorus into the lagoons. Time series data have been examined from 2000 to 2013 for physical, chemical and biological (phytoplankton) variables of the water column during the summer period. Since 2006, total nitrogen and phosphorus... |
| Tipo: Text |
Palavras-chave: Phytoplankton; Coastal lagoons; Nutrient; Sewage effluents; Re-oligotrophication. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00346/45701/45324.pdf |
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