Effects of increasing salinity on a cyanobacteria bloom in the Potomac River estuary

Sellner, Kevin G.; Lacouture, Richard; Parrish, CC

doi:10.1093/plankt/10.1.49

Cited by 72 publications

(50 citation statements)

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“…During this period, charophytes disappeared from the lake and Potamogeton pectinatus increased in abundance (Stefanidis & Papastergiadou, 2010). Between 1987 and1988, charophytes occurred in 33% of the sampling plots, while Potamogeton pectinatus and Myriophyllum spicatum were found in 38 and 52% of the total sampling plots, respectively (Papastergiadou & Babalonas, 1993). Almost 20 years later, charophytes were absent from all macrophyte samples between 2006 and 2008, while the relative frequency of P. pectinatus and M. spicatum increased to 59 and 67%, respectively (Stefanidis & Papastergiadou, 2013).…”

Section: Case Studiesmentioning

confidence: 99%

“…Prolonged hydraulic residence times resulting from drought also enhance salinization (Beklioglu et al, 2007;Beklioglu et al, 2011). Increased salinity not only favours cyanobacteria blooms (Sellner et al, 1988) but may also cause a ionic imbalance in saltsensitive taxa, resulting in ion toxicity and osmotic stress accompanied by high mortality or lower reproduction and growth rates (Nielsen et al, 2003;Jeppesen et al, 2007;Bezirci et al, 2012). Such conditions can significantly reduce the resilience of lake ecosystems or even induce a state shift to turbid water Barker et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

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Ecological impacts of global warming and water abstraction on lakes and reservoirs due to changes in water level and related changes in salinity

et al. 2015

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According to the Intergovernmental Panel on Climate Change report released in September 2014, unprecedented changes in temperature and precipitation patterns have been recorded globally in recent decades and further change is predicted to occur in the near future, mainly as the result of human activity. In particular, projections show that the Mediterranean climate zone will be markedly affected with significant implications for lake water levels and salinity. This may be exacerbated by increased demands for irrigation water. Based on long-term data from seven lakes and reservoirs covering a geographical gradient of 52°of latitudes and a literature review, we discuss how changes in water level and salinity related to climate change and water abstraction affect the ecosystem structure, function, biodiversity and ecological state of lakes and reservoirs. We discuss mitigation measures to counteract the negative effects on ecological status that are likely to result from changes in climate and water abstraction practices. Finally, we highlight research required to improve knowledge of the impacts of anthropogenically induced changes on lake water level and consequent changes in salinity.

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Section: Case Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ecological impacts of global warming and water abstraction on lakes and reservoirs due to changes in water level and related changes in salinity

et al. 2015

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“…We therefore assume that the relative compositional changes that occurred during aggregate formation reflect natural processes even though the total amount of aggregates yielded during the roller table incubation was higher than in situ. Aggregation of filamentous cyanobacteria has rarely been studied (Sellner et al, 1988;Grossart, 1996), although floating aggregates have been reported as a final stage of filamentous cyanobacteria blooms. This study showed that the diazotrophic cyanobacteria Aphanizomenon ' baltica ', Nodularia spumigena and Anabaena spp.…”

Section: Particle Sequestration During the Aggregation Experimentsmentioning

confidence: 99%

Chemical and Biological Composition of Suspended Particles and Aggregates in the Baltic Sea in Summer (1999)

Engel¹,

Meyerhöfer²,

Bröckel³

2002

Estuarine, Coastal and Shelf Science

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Suspended particles and particle aggregates, which formed from concentrated field samples on the roller table, were characterized biologically and chemically along a transect through the Baltic Sea in summer 1999. Phytoplankton composition in field samples was dominated by cyanobacteria, including the filamentous diazotrophic cyanobacteria Aphanizomenon ' baltica', Nodularia spumigena and Anabaena spp. These species formed aggregates together with diatoms, mainly Skeletonema costatum and Chaetoceros spp. and with dinoflagellates, mainly with Dinophysis norvegica. Compared to the Redfield ratio, concentration ratios of particulate organic carbon, nitrogen and phosphorus, [POC]: [PON]: [POP], indicated an enrichment of carbon, especially in aggregates. However, regression analysis indicated a higher production rate of PON relative to POP and POC and significant background concentrations of POC. In field samples the concentration of transparent exopolymer particles (TEP) varied around 200 g Xanthan Equiv. l 1 and comprised a volume fraction of 2-7 ppm and an abundance of about 10 5 TEP ml 1 . TEP were enriched in aggregates as inferred from volume ratios of TEP to conventional particles. It is suggested, that TEP contribute substantially to the background concentration of POC, while the high production rate of PON is attributed to nitrogen fixation of diazotrophic cyanobacteria.

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“…On a spatial scale, the presence of cyanobacterial species varied. Microcystis spp., the most common cyanobacterial species, appear mainly in the upper, freshwater zones of estuaries [39,40]. Their photosynthetic efficiency diminishes while moving down the estuary [41]; therefore, the abundance of the toxic species decreases downstream [21].…”

Section: Temporal and Spatial Dynamics Of Cyanobacteriamentioning

confidence: 99%

Spatial and Temporal Dynamics of Potentially Toxic Cyanobacteria in the Riverine Region of a Temperate Estuarine System Altered by Weirs

Malazarte

Lee

Kim

et al. 2017

Water

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Abstract:The effects of weirs on fish and other biological communities have garnered considerable study, whereas the effects of weirs on community composition of toxic cyanobacteria have not yet been well documented. In this study, temporal and spatial variations in species composition and the abundance of potentially toxic cyanobacteria were investigated in the riverine regions of the temperate Youngsan River estuary, where two weirs have recently been constructed. Four stations were sampled 0.5 m below the surface monthly along the channel of the upper river from May 2014 to April 2015 to explore cyanobacterial composition and abundance, while physicochemical and biological parameters were measured to elucidate possible mechanisms controlling these dynamics. Two stations were located upstream at free-flowing sites, and the other stations were located downstream at impounded sites near the weirs. Twenty-eight cyanobacterial species were identified, seven of which were potentially toxic: Microcystis sp., M. aeruginosa, M. flos-aquae, Dolichospermum sp., Aphanocapsa sp., Oscillatoria sp. and Phormidium sp. Microcystis sp. was the most abundant in June 2014 at the lowest station near the weir. Meanwhile, Phormidium sp. occurred at low abundance throughout the study period, except during the winter months, when its abundance was elevated. The interactive forward selection method highlighted dissolved inorganic nitrogen and zooplankton abundance as explanatory variables for this observed variation, but their effects on cyanobacterial growth are unclear. However, temperature was the major determinant for the temporal variation in cyanobacterial populations. Cluster analysis showed that the downstream stations near the weirs had a high similarity of potentially toxic cyanobacteria. Significantly higher abundance, especially of Microcystis sp., was also recorded at the impounded sites suggesting that the presence of weirs might affect variations in toxic cyanobacterial communities.

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Effects of increasing salinity on a cyanobacteria bloom in the Potomac River estuary

Cited by 72 publications

References 0 publications

Ecological impacts of global warming and water abstraction on lakes and reservoirs due to changes in water level and related changes in salinity

Ecological impacts of global warming and water abstraction on lakes and reservoirs due to changes in water level and related changes in salinity

Chemical and Biological Composition of Suspended Particles and Aggregates in the Baltic Sea in Summer (1999)

Spatial and Temporal Dynamics of Potentially Toxic Cyanobacteria in the Riverine Region of a Temperate Estuarine System Altered by Weirs

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