A structural analysis of the phytoplankton of the Paraná de las Palmas river (lower Paraná)

Mercado, Liliana; Gómez, Nora

doi:10.1127/lr/11/2000/453

Cited by 4 publications

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“…In well-mixed waters, such as estuarine and coastal waters, where heat is dispersed very quickly, the influence may be modest. For example, no significant effluent effects on phytoplankton were detected in the Parana River (Mercado & Gomez 1999) or in the well-mixed zone north of Taiwan (Lo et al 2004), and little influence to the Meuse River was noted for the Tihange nuclear power plant (Descy & Mouvet 1984). However, if thermal discharge is directed into enclosed water bodies (e.g.…”

Section: Introductionmentioning

confidence: 99%

Diatom to dinoflagellate shift in the summer phytoplankton community in a bay impacted by nuclear power plant thermal effluent

Tao¹,

Liu

Huang³

et al. 2011

Mar. Ecol. Prog. Ser.

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Understanding how nuclear power plant thermal effluents influence the phytoplankton community may provide insights into the potential ecological consequences of global warming. In the present study, long-term trends in the phytoplankton community structure under the influence of nuclear power plant thermal effluent in the subtropical Daya Bay (DYB) in China were investigated in the summer season from 1982 to 2005. Water temperature at the outfall station was significantly higher than in the surrounding water, by as much as 5.6°C, and increased by 6.8°C during the 23 yr study period. The contribution of diatoms and dinoflagellates to the total phytoplankton showed significant correlation with temperature (R 2 > 0.65), negative for diatoms, while positive for dinoflagellates. Although dinoflagellate abundance increased over time at both the outfall and adjacent (control) stations, the increase at the outfall station was much more dramatic and accelerated over time. No clear relationship between the phytoplankton shift and stratification was evident. When water temperature reached 35°C or > 3.7°C above that at the control station, dinoflagellates, such as Ceratium furca, C. fusus, C. trichoceros, Dinophysis caudate and Protoperidinium depressum, grew to prominence, accounting for about 50% of the total phytoplankton abundance. On the contrary, the diatom contribution decreased during the study period, from 82.0% in 1982 to 53.1% in 2005. These results suggest that the rise in temperature caused by power plant thermal discharge has imposed strong influences on the phytoplankton community, favoring dinoflagellates over diatoms, with a remarkable diatom to dinoflagellate shift when temperature increases to a threshold level of 35°C or reaches a threshold differential of 3.7°C relative to the normal ambient temperature in DYB.KEY WORDS: Daya Bay · Nuclear power plant · Thermal effluent · Phytoplankton · Ecological effects Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 424: [75][76][77][78][79][80][81][82][83][84][85] 2011 perature can be indirect, via a decrease in the resupply of nutrients for phytoplankton production resulting from the intensification of water stratification (Margalef 1978, Jones & Gowen 1990. Since phytoplankton have short generation times, they can rapidly respond to temperature increases, and, because they are at the base of the aquatic food web, observations of their responses could provide useful insights into how temperature increases may induce ecosystem changes (Niemi & McDonald 2004). Phytoplankton community structure and abundance have been found to be changing as a result of global warming in many areas (Richardson & Schoeman 2004). For example, the changes in phytoplankton communities have been used as indicators of global warming in the North Sea (Edwards & Richardson 2004) and to monitor nonnative, warm-water species in the Mediterranean and the North Seas (Walther et al. 2002). Because organisms at different trophic levels m...

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Section: Introductionmentioning

confidence: 99%

Diatom to dinoflagellate shift in the summer phytoplankton community in a bay impacted by nuclear power plant thermal effluent

Tao¹,

Liu

Huang³

et al. 2011

Mar. Ecol. Prog. Ser.

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Mercado

2003

Hydrobiologia

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Phytoplankton of the Paraná River Basin

Devercelli¹,

Zalocar²,

Forastier³

et al. 2014

adv_limnology

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We summarize the information on the phytoplankton of the Paraná River in the Argentine stretch, comparing the density, biomass, functional groups and diversity studies of the mainstem and fl oodplain since the 70's. We described the Yacyretá Reservoir and its impact downriver since it started operating in 1994. The spatio-temporal changes of the phytoplankton are associated to the hydrosedimentological regime. Regular variations in the hydrological phases and shorter permanent fl uctuations are essential for phytoplankton maintenance, since they allow the lateral exchange with zones of higher algal accumulation in the main channel and with the fl oodplain. During ordinary hydrological cycles, the mainstem shows a typical potamoplankton, dominated by Aulacoseira granulata and, alternatively, with sub-dominance of Chlorococcales, Cryptophyceae at the Middle and Lower Stretch, Cyanobacteria abound at Yacyretá Reservoir and downriver at the High and the beginning of the Middle Stretch. The disruption of Yacyretá Reservoir produces profound changes in the High Paraná phytoplankton evidenced in increased density and replacement of dominant species; Cryptophyceae replaced the Bacillariophyceae. Since 2001, water transparency increased and phosphorus concentration decreased, as well as the density and diversity of phytoplankton. Since 2004, an increase in Cyanobacteria was observed with bloom of Microcystis aeruginosa that extended 220 km downstream of the dam. Anomalous hydrological cycles, related to the ENSO phenomenon produced changes in phytoplankton density and structure. During El Niño, the system maintains a relative homogeneous phytoplankton assemblage, although mean density values are signifi cantly lower than those registered in ordinary hydrological periods. La Niña provokes a more drastic change in the community, due to the disruption in the exchange with the alluvial valley. The river-fl oodplain connectivity is essential for the maintenance of phytoplankton diversity.

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A structural analysis of the phytoplankton of the Paraná de las Palmas river (lower Paraná)

Cited by 4 publications

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Diatom to dinoflagellate shift in the summer phytoplankton community in a bay impacted by nuclear power plant thermal effluent

Diatom to dinoflagellate shift in the summer phytoplankton community in a bay impacted by nuclear power plant thermal effluent

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Phytoplankton of the Paraná River Basin

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