Spatial and temporal variation of picoplanktic cyanobacteria population in a density stratified estuary, and the introduction of a cellular gradient number

Carrillo, Alejandro; Huq, Pablo; Pérez, M.C.; Redondo, J. M.

doi:10.1016/j.ecss.2007.06.015

Cited by 2 publications

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“…[14,18,19]]. However, in these studies, salinity never exceed 3.5% and the dynamics of phototrophic communities under high salinity conditions (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Distribution of picophytoplankton communities from brackish to hypersaline waters in a South Australian coastal lagoon

et al. 2010

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BackgroundPicophytoplankton (i.e. cyanobacteria and pico-eukaryotes) are abundant and ecologically critical components of the autotrophic communities in the pelagic realm. These micro-organisms colonized a variety of extreme environments including high salinity waters. However, the distribution of these organisms along strong salinity gradient has barely been investigated. The abundance and community structure of cyanobacteria and pico-eukaryotes were investigated along a natural continuous salinity gradient (1.8% to 15.5%) using flow cytometry.ResultsHighest picophytoplankton abundances were recorded under salinity conditions ranging between 8.0% and 11.0% (1.3 × 106 to 1.4 × 106 cells ml-1). Two populations of picocyanobacteria (likely Synechococcus and Prochlorococcus) and 5 distinct populations of pico-eukaryotes were identified along the salinity gradient. The picophytoplankton cytometric-richness decreased with salinity and the most cytometrically diversified community (4 to 7 populations) was observed in the brackish-marine part of the lagoon (i.e. salinity below 3.5%). One population of pico-eukaryote dominated the community throughout the salinity gradient and was responsible for the bloom observed between 8.0% and 11.0%. Finally only this halotolerant population and Prochlorococcus-like picocyanobacteria were identified in hypersaline waters (i.e. above 14.0%). Salinity was identified as the main factor structuring the distribution of picophytoplankton along the lagoon. However, nutritive conditions, viral lysis and microzooplankton grazing are also suggested as potentially important players in controlling the abundance and diversity of picophytoplankton along the lagoon.ConclusionsThe complex patterns described here represent the first observation of picophytoplankton dynamics along a continuous gradient where salinity increases from 1.8% to 15.5%. This result provides new insight into the distribution of pico-autotrophic organisms along strong salinity gradients and allows for a better understanding of the overall pelagic functioning in saline systems which is critical for the management of these precious and climatically-stress ecosystems.

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“…[14,18,19]]. However, in these studies, salinity never exceed 3.5% and the dynamics of phototrophic communities under high salinity conditions (i.e.…”

Section: Introductionmentioning

confidence: 99%

“…Several studies have been performed within estuaries or bays investigating planktonic cyanobacteria and/or eukaryotic picophytoplankton communities [e.g. [ 14 , 18 , 19 ]]. However, in these studies, salinity never exceed 3.5% and the dynamics of phototrophic communities under high salinity conditions (i.e.…”

Section: Introductionmentioning

confidence: 99%

Distribution of picophytoplankton communities from brackish to hypersaline waters in a South Australian coastal lagoon

et al. 2010

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A brief synopsis of phycological studies in Uruguay

Bonilla

2023

Cymbella

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In this article, I summarize the development of the phycology in Uruguay since the beginning of the !9th Century. Uruguayan phycological research has been dominated by ecological, eco-physiological and taxonomical studies of freshwater phytoplankton, influenced by the development of limnology, with few studies completed on marine macroalgae. Other areas such as biotechnology, evolution and the biology of algae and cyanobacteria are still largely unexplored. I pay homage to María del Carmen Pérez (1959-2022), who was the most important Uruguayan phytoplankton taxonomist ever, and a kind, enthusiastic and hard-working person with a distinctive passion for the phytoplankton taxonomy.

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Spatial and temporal variation of picoplanktic cyanobacteria population in a density stratified estuary, and the introduction of a cellular gradient number

Cited by 2 publications

References 12 publications

Distribution of picophytoplankton communities from brackish to hypersaline waters in a South Australian coastal lagoon

Distribution of picophytoplankton communities from brackish to hypersaline waters in a South Australian coastal lagoon

A brief synopsis of phycological studies in Uruguay

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