scholarly journals Growth rates of microalgae encapsulated in calcium alginate as a possible indicator of the trophic state of aquatic ecosystems

Limnetica ◽  
2021 ◽  
Vol 40 (2) ◽  
pp. 385-398
Author(s):  
Gabriel A. Pinilla ◽  
Luis Carlos Montenegro ◽  
Luz Marina Malgarejo ◽  
Nicolás Molano-González ◽  
Alfonso Pineda ◽  
...  
Keyword(s):  
Growth Rates ◽  
Aquatic Ecosystems ◽  
Calcium Alginate ◽  
Trophic State

scholarly journals Bioindicators of climate and trophic state in lowland and highland aquatic ecosystems of the Northern Neotropics

2013 ◽  
Vol 61 (2) ◽  
Author(s):  
Liseth Pérez ◽  
Julia Lorenschat ◽  
Julieta Massaferro ◽  
Christine Pailles ◽  
Florence Sylvestre ◽  
...  
Keyword(s):  
Aquatic Ecosystems ◽  
Trophic State

scholarly journals Spatial variation of picoplankton communities along a cascade reservoir system in Patagonia, Argentina

2021 ◽  
Author(s):  
M. Carolina Bernal ◽  
Lunhui Lu ◽  
Carmen Sabio y García ◽  
María Laura Sánchez ◽  
M. Solange Vera ◽  
...  
Keyword(s):  
Aquatic Ecosystems ◽  
Trophic State ◽  
High Throughput Sequencing ◽  
Illumina Miseq ◽  
Opposite Pattern ◽  
Bacterial Composition ◽  
Spatial Changes ◽  
Water Retention Time ◽  
Spatial Differences ◽  
Bacterial Biodiversity

In this study we explored how picoplankton community structure and diversity varied along three cascade oligo-mesotrophic reservoirs of the Limay River (Patagonia, Argentina): Alicura, Piedra del Águila and Ramos Mexía. We analyzed the spatial changes, covering lotic and lentic stretches along a gradient of 262 km from Andes to steppe, and we also sampled the main affluent of the Limay River (Collon Cura). In all sampling sites the main limnological variables were measured, and the picoplankton abundance (autotrophic and heterotrophic) was analyzed by flow cytometry. The bacterial biodiversity was assessed using high throughput sequencing Illumina MiSeq. We expected an increase in the trophic state along this series of cascade reservoirs, which would determine spatial differences in the structure of the picoplankton communities. We also hypothesized that the lotic and lentic conditions along the system would influence the bacterial composition. The results showed a slight increase in trophic state together with an increase in overall picoplankton abundance downstream, towards Ramos Mexía Reservoir. Picocyanobacteria were represented by phycoerythrin-rich cells all along the system, in accordance to the pattern described for oligotrophic aquatic ecosystems. Multivariate analyses based on bacterial OTU composition and environmental variables showed a spatial ordination of sites following the trend of increasing trophic state downstream. Molecular analyses of bacterial OTU diversity also showed an increase in richness and a decrease in evenness at the lotic stretches, and the opposite pattern in the reservoirs, suggesting that water retention time may play a role in structuring the community composition.

Expanding the concept of trophic state in aquatic ecosystems: It’s not just the autotrophs

2007 ◽  
Vol 69 (4) ◽  
pp. 427-439 ◽  
Author(s):  
Walter K. Dodds ◽  
Jonathan J. Cole
Keyword(s):  
Aquatic Ecosystems ◽  
Trophic State

Assessment of Eutrophication in Wuliangsuhai Lake

2014 ◽  
Vol 955-959 ◽  
pp. 1098-1102 ◽  
Author(s):  
Huan Yang ◽  
Rui Hong Yu ◽  
Rui Hong Guo ◽  
Yun Hao ◽  
Yu Jin Zhang
Keyword(s):  
Water Quality ◽  
Aquatic Ecosystems ◽  
Trophic State ◽  
Trophic Status ◽  
Arid Area ◽  
Eutrophication Control ◽  
State Classification ◽  
Fundamental Information ◽  
The World

Eutrophication has led to severe water quality problems in aquatic ecosystems throughout the world. The assessment of trophic status for lakes may provide important and fundamental information for trophic state classification and eutrophication control. This paper assesses and analyzes the classification of eutrophication using three different methods in Wuliangsuhai Lake. The aim is to provide the reference for water quality improvement and aquatic environmental protection of the lake in arid area.

scholarly journals Effects of Grazing and Nutrients on Phytoplankton Blooms and Microplankton Assemblage Structure in Four Temperate Lakes Spanning a Eutrophication Gradient

Water ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1085
Author(s):  
Vanessa Rose ◽  
Gretchen Rollwagen-Bollens ◽  
Stephen M. Bollens ◽  
Julie Zimmerman
Keyword(s):  
Growth Rates ◽  
Trophic State ◽  
Abiotic Factors ◽  
Washington State ◽  
Assemblage Structure ◽  
Interactive Effects ◽  
Phytoplankton Assemblage ◽  
Nutrient Enhancement ◽  
Incubation Experiments ◽  
Nitrogen Phosphorus

Phytoplankton assemblage dynamics are sensitive to biotic and abiotic factors, as well as anthropogenic stressors such as eutrophication, and thus are likely to vary between lakes of differing trophic state. We selected four lakes in Washington State, USA, ranging from oligo- to hypereutrophic, to study the separate and interactive effects of enhanced nutrient availability and zooplankton grazing on phytoplankton net growth rates and overall microplankton (phytoplankton and microzooplankton) assemblage structure. We collected water quality and plankton samples monthly in each lake from May to October 2014, and also conducted laboratory incubation experiments using ambient plankton assemblages from each lake with amendments of zooplankton grazers (5× ambient densities) and nutrients (Nitrogen + Phosphorus) in June, August, and October. In each set of monthly experiments, nested two-way ANOVAs were used to test the effects of enhanced grazers and nutrients on net chlorophyll a-based phytoplankton growth rates. Nested PERMANOVAs were used to test the effects of each factor on microplankton assemblage structure. Enhanced grazing reduced phytoplankton net growth in oligotrophic Cle Elum Lake and oligo-mesotrophic Lake Merwin in August (p < 0.001) and Merwin again in October (p < 0.05), while nutrient enhancement increased phytoplankton net growth in Lake Merwin in June (p < 0.01). Changes in microplankton assemblage composition were not detected as a result of either factor, but they were significantly different between sites (p < 0.001) during each month, and varied by month within each lake. Significant effects of both enhanced grazers and nutrients were detected in systems of low, but not high, trophic state, although this varied by season. We suggest that it is critical to consider trophic state when predicting the response of phytoplankton to bottom-up and top-down factors in lakes.

Reduced growth rates of hair in mice following radiation

1966 ◽  
Vol 94 (4) ◽  
pp. 491-498 ◽  
Author(s):  
F. D. Malkinson
Keyword(s):  
Growth Rates
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