Limnological characteristics, eutrophication and cyanobacterial blooms in an inland reservoir, Australia

Rahman, Ataur; Bakri, Dhia Al; Ford, Phillip W.; Church, Tony

doi:10.1111/j.1440-1770.2005.00279.x

Cited by 25 publications

(17 citation statements)

References 14 publications

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“…They became dominant very quickly and remained so through the whole summer and early autumn. Such dominance of cyanobacteria in eutrophic lakes is a phenomenon already pointed out by several authors (Oliver and Ganf 2000;Calijuri et al 2002;Mischke 2003;Rahman et al 2005;Havens 2008). In most of the reservoirs of La Plata River Basin and in other lakes of Argentina, cyanobacteria dominance is mainly accounted for by Microcystis aeruginosa (Pizzolon et al 1999;Calijuri et al 2002;Chalar 2009).…”

Section: Discussionmentioning

confidence: 84%

Phytoplankton structure and diversity in the eutrophic-hypereutrophic reservoir Paso de las Piedras, Argentina

2011

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This study aimed at analyzing the phytoplankton structure and dynamics in Paso de las Piedras Reservoir, Argentina, through the study of dominant species, diversity and similarity in relation with the abiotic environment. Samples were collected weekly or biweekly (January 2004-June 2005 at four sampling stations. The reservoir experienced a seasonal progression in phytoplankton composition that underlines six successional periods, each one characterized by the dominance of one or a few species. Cyanobacteria, green algae and diatoms were the most important constituents of the reservoir's phytoplankton. Cyanobacteria dominated during summer and early autumn, green algae during late autumn and early winter, and diatoms during winter and spring. A high abundance of R. lacustris (Cryptophyceae) was observed during late September and early October. The general pattern of species succession is coherent with the general model of plankton seasonal succession described by the PEG model; however, the major discrepancy is the extremely short clear water phase observed. Successional periods were associated with changes in abiotic variables, and they showed differences in ecological traits. Cyanobacteria-Dictyosphaerium, Cyclotella, Stephanodiscus and Anabaena-diatom periods were characterized by a low number of cells, high diversity, with both dominance and specific richness low. On the contrary, during Cyanobacteria and Cyanobacteria II periods, the highest abundance was observed associated with low diversity and high dominance.

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Section: Discussionmentioning

confidence: 84%

Phytoplankton structure and diversity in the eutrophic-hypereutrophic reservoir Paso de las Piedras, Argentina

2011

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“…Similar to microscopy reports (Dupont 2009), we found few Cyanobacteria in some of the ponds. While high phosphorus concentrations coupled with a stable water column could favor Cyanobacteria blooms, their growth in these highly turbid ponds is likely limited by light availability (Rahman et al 2005). Indeed, Cyanobacteria were most common in KWK-6 with the lowest turbidity, followed by KWK-12 and KWK-1, and none detected from KWK-23, the most turbid pond.…”

Section: Surface Bacterial Assemblagesmentioning

confidence: 98%

Distribution and identity of Bacteria in subarctic permafrost thaw ponds

Rossi¹,

Laurion²,

Lovejoy³

2013

Aquat. Microb. Ecol.

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Colored permafrost thaw ponds (thermokarst ponds), are abundant freshwater ecosystems in the subarctic. The ponds can emit significant levels of greenhouse gases, which are drivers of climate change, but little is known of their microbial communities. The ponds are vertically stratified for most of the year with suboxic to anoxic hypolimnia, suggesting varied habitats despite their shallow depths (1 to 4 m). Pelagic bacterial communities in 4 contrasting ponds near the coast of Hudson Bay, Quebec, Canada, were investigated by cloning and sequencing the 16S rRNA gene from environmental DNA. Surface and bottom water libraries yielded a total of 109 operational taxonomical units (defined as 97% sequence similarity) from 261 clones. The majority of clones had their closest matches to other environmental clones originating from freshwater environments, especially lakes. Proteobacteria accounted for the majority of sequences (33%), followed by Bacteroidetes (19%), Actinobacteria (13%), Chlorobi (10%), Verrucomicrobia (8%), and Cyanobacteria (7%). There were large differences in the assemblages inhabiting the different ponds and water layers. Bacteroidetes were predominant at the surface, while Chlorobi were found in bottom waters. Sequences with best matches to known methanotrophic bacteria represented up to 20% of all sequences. Methanotrophs included Methylobacter psychrophilus, Crenothrix polyspora, and Methylocystis parvus as closest matches. Ordination analysis clearly separated surface and bottom waters, where relatively large quantities of organic matter, low light availability, cool temperatures, and suboxic conditions selected for the distinct communities. The separation of surface waters of different ponds showed that bacterial communities could differ between superficially similar environments. This study illustrates the high diversity in bacterial assemblages occurring in ponds separated by a few meters, and thus, the potentially complex response of thaw pond systems to climate change.

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“…This toxic blue-green algal blooms are dominated by Anabaena and Microcystis genera (Rahman et al 2005). The bloom is adversely affecting the town water supply, aquatic ecosystem and recreational amenity of the reservoir.…”

Section: Introductionmentioning

confidence: 99%

“…The bloom is adversely affecting the town water supply, aquatic ecosystem and recreational amenity of the reservoir. The reservoir is P limited in terms of cyanobacteria bloom with an N:P molar ratio greater than 20 (Rahman et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Contribution of diffuse sources to the sediment and phosphorus budgets in Ben Chifley Catchment, Australia

Rahman

Bakri

2009

Environ Earth Sci

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Relative contribution of different diffuse sources to the sediment and phosphorous (P) budgets in the Ben Chifley Reservoir was estimated using a multivariate mixing model and geochemical indices and tracers. The influence of the underlying geology on land use characteristics and the dynamics of sediment and P in the catchment were discussed. Sediments currently in transport to the reservoir are derived mainly from areas underlain by Quaternary alluvium, accounting for 33% of the reservoir sediment budget. A major portion of the sediments from the Quaternary alluvium originates from pasture land which also contributes about 60% of sediment-bound P in the reservoir, followed by cropland (30%) and forest area (10%). Phosphorus-based fertiliser contributes more than 50% of the soil P in pasture and cropland and more than 60% in forest plantation area. The remaining P reaching the reservoir originates from natural soils (native sources). Phosphate from both fertiliser and native sources are transported to the water courses and ultimately the reservoir as a consequence of gully, stream bank and surface erosion. Erosion control, trapping of fertiliser runoff, establishing riparian vegetation and reducing application of P-based fertiliser by increasing native pasture cultivation in the risk areas should be considered as management options for controlling the impact of P and sediment in the reservoir.

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Limnological characteristics, eutrophication and cyanobacterial blooms in an inland reservoir, Australia

Cited by 25 publications

References 14 publications

Phytoplankton structure and diversity in the eutrophic-hypereutrophic reservoir Paso de las Piedras, Argentina

Phytoplankton structure and diversity in the eutrophic-hypereutrophic reservoir Paso de las Piedras, Argentina

Distribution and identity of Bacteria in subarctic permafrost thaw ponds

Contribution of diffuse sources to the sediment and phosphorus budgets in Ben Chifley Catchment, Australia

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