Light limitation helps stabilize the phytoplankton assemblage steady-state in a temperate and highly turbid, hypertrophic shallow lake (Laguna Chascomús, Argentina)

Iachetti, Clara M.; Llames, María Eugenia del Rosario

doi:10.1007/s10750-014-2045-8

Cited by 22 publications

(15 citation statements)

References 68 publications

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“…Brackish waters worldwide show diverse patterns, which were summarized for some lagoons by Lopes and Vasconcelos (2011). The dominance of picocyanobacterial species is reported for other lagoons, e.g., Patos Lagoon, Brazil or Florida Bay, United States (Phlips et al, 1999), Chesapeake Bay, United States (Wang and Chen, 2004; Chen et al, 2006) and Laguna Chascomús, Argentina (Iachetti and Llames, 2015) ( Table 1 ). Similar phytoplankton communities are also found in freshwater lakes (e.g., Lake Santa Olalla, Spain (López-Archilla et al, 2004), Lake Baikal, Russia (Belykh et al, 2006), lakes in southern Sweden (Komárková-Legnerová and Cronberg, 1994), Guarapiranga Reservoir, Brazil (Santos et al, 2015), Vargem das Flores Reservoir, Brazil (Gomes et al, 2012), reservoirs along the Iguaçu River, Brazil (Silva et al, 2005) and in the Mount Cameroon region, Cameroon (Oben and Oben, 2006).…”

Section: Discussionmentioning

confidence: 88%

Identification of Cyanobacteria in a Eutrophic Coastal Lagoon on the Southern Baltic Coast

2017

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Cyanobacteria are found worldwide in various habitats. Members of the picocyanobacteria genera Synechococcus and Prochlorococcus dominate in oligotrophic ocean waters. Other picocyanobacteria dominate in eutrophic fresh or brackish waters. Usually, these are morphologically determined as species of the order Chroococcales/clade B2. The phytoplankton of a shallow, eutrophic brackish lagoon was investigated. Phytoplankton was dominated by Aphanothece-like morphospecies year-round for more than 20 years, along a trophy and salinity gradient. A biphasic approach using a culture-independent and a culture-dependent analysis was applied to identify the dominant species genetically. The 16S rRNA gene phylogeny of clone sequences and isolates indicated the dominance of Cyanobium species (order Synechococcales sensu Komárek/clade C1 sensu Shih). This difference between morphologically and genetically based species identifications has consequences for applying the Reynolds functional-groups system, and for validity long-term monitoring data. The literature shows the same pattern as our results: morphologically, Aphanothece-like species are abundant in eutrophic shallow lagoons, and genetically, Cyanobium is found in similar habitats. This discrepancy is found worldwide in the literature on fresh- and brackish-water habitats. Thus, most Aphanothece-like morphospecies may be, genetically, members of Cyanobium.

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Section: Discussionmentioning

confidence: 88%

Identification of Cyanobacteria in a Eutrophic Coastal Lagoon on the Southern Baltic Coast

2017

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“…and Eucapsis sp. ), together with other less abundant nano‐ and microphytoplankters (mainly chlorophytes and diatoms) were estimated by inverted microscopy following the protocol as described in Iachetti and Llames ().…”

Section: Methodsmentioning

confidence: 99%

“…In some hypertrophic shallow lakes, the phytoplankton assemblage is permanently dominated by CPcy, e.g. lake Chascomús (Fermani et al ., ; Iachetti and Llames, , Izaguirre et al ., ). In this particular system, the abundance of Pcy is also high and ranges among the highest values reported for aquatic systems.…”

Section: Introductionmentioning

confidence: 99%

Phenotypic plasticity in freshwater picocyanobacteria

Huber

Diovisalvi

Ferraro

et al. 2017

Environmental Microbiology

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Picocyanobacteria can occur as single-cell (Pcy) or as colonies (CPcy). Published evidence suggests that some Pcy strains have the capability to aggregate under certain culture conditions, however this has not been demonstrated to occur in natural environments. We investigated whether the Pcy and CPcy belong to the same species (i.e. phylotype), and the factors that determine their morphological and genetic variability in a hypertrophic shallow lake dominated by picocyanobacteria. Six main different morphologies and >30 phylotypes were observed. All sequences retrieved belonged to the 'Anathece + Cyanobium' clade (Synechococcales) that are known to have the capability of aggregation/disaggregation. The temporal variation of picocyanobacteria morphotype composition was weakly correlated with the DGGE temporal pattern, and could be explained by the composition of the zooplankton assemblage. Laboratory experiments confirmed that the small cladoceran Bosmina favoured the dominance of CPcy, i.e. Cyanodictyon doubled the size of the colonies when present, most likely through the aggregation of single-cell picocyanobacteria into colonies. Flow cytometry cell sorting and 16S rRNA + ITS sequencing of the Pcy and CPcy cytometrically-defined populations revealed that some phylotypes could be found in both sorted populations, suggesting phenotypic plasticity in which various Synechococcales phylotypes could be found in situ either as single-cells or as colonies.

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“…36 Known toxic cyanobacteria strains have not been reported; and sporadic assessments of cyanotoxins resulted consistently negative (O'Farrell comp. In order to assess seasonal differences in the food value of natural lake seston, the experiments were performed once in summer and once in winter.…”

Section: Life Table Assaysmentioning

confidence: 99%

Rotifer dynamics in three shallow lakes from the Salado river watershed (Argentina): the potential modulating role of incident solar radiation

Diovisalvi

Rennella

Zagarese

2015

Photochem Photobiol Sci

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In turbid Pampean lakes, incident solar radiation is a major driver of plankton seasonal dynamics. Higher light availability in summer translates into higher primary production, and therefore more food for zooplankton grazers. However, experimental evidence suggests that food produced under the high irradiance conditions prevailing in summer are less suitable to sustain rotifer population growth than that produced under the lower irradiance conditions typical of winter. Here, we analysed time series datasets corresponding to three shallow lakes from the Salado river watershed. This analysis provided evidence for similar seasonal patterns of rotifer relative abundance over a large geographic area. In addition, we performed life table experiments to test the hypothesis that natural seston produced in winter could sustain higher population growth rates than seston produced in summer. We suggest that the natural seasonal changes in temperature and food generate successive time windows, which may be capitalized by the different grazer species, resulting in predictable phenology of grazer populations.

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Light limitation helps stabilize the phytoplankton assemblage steady-state in a temperate and highly turbid, hypertrophic shallow lake (Laguna Chascomús, Argentina)

Abstract: Light limitation helps stabilize the phytoplankton assemblage steady-state in a temperate and highly turbid, hypertrophic shallow lake (Laguna Chascomús, Argentina

Cited by 22 publications

References 68 publications

Identification of Cyanobacteria in a Eutrophic Coastal Lagoon on the Southern Baltic Coast

Identification of Cyanobacteria in a Eutrophic Coastal Lagoon on the Southern Baltic Coast

Phenotypic plasticity in freshwater picocyanobacteria

Rotifer dynamics in three shallow lakes from the Salado river watershed (Argentina): the potential modulating role of incident solar radiation

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