Continuous Culturing of Natural Phytoplankton Communities in the Experimental Lakes Area: Effects of Enclosure, in situ Incubation, Light, Phosphorus, and Cadmium

1980 ◽  
Vol 37 (3) ◽  
pp. 424-433 ◽  
Author(s):  
F. deNoyelles Jr. ◽  
R. Knoechel ◽  
D. Reinke ◽  
D. Treanor ◽  
C. Altenhofen
Keyword(s):  
Lake Water ◽  
Environmental Changes ◽  
Algal Culture ◽  
Experimental Lakes Area ◽  
Batch Cultures ◽  
In Situ Incubation ◽  
Phytoplankton Communities ◽  
Natural Phytoplankton ◽  
Existing Data

Continuous culture chambers containing and receiving raw lake water as an inflow were incubated in the laboratory and in situ. This was done to determine the suitability of continuous algal culture for recording the responses of lake phytoplankton to experimentally imposed perturbations simulating environmental changes. The distribution of the phytoplankton in control chambers, particularly with in situ incubation, remained similar to that of the lake. Other chambers produced changes in distribution as responses to perturbations of filtered inflow, light, a nutrient, and cadmium. These responses were consistent with existing data for lakes at the Experimental Lakes Area, including the responses to cadmium which were compared to those from tube experiments. The relative merits of these and other types of enclosures including batch cultures, large bags, and tubes are discussed.Key words: phytoplankton culture, enclosure effects, phosphorus, light, cadmium, bioassay, microcosms

The species-specific effects of sublethal concentrations of cadmium on freshwater phytoplankton communities in a Canadian Shield lake

1985 ◽  
Vol 63 (11) ◽  
pp. 1997-2003 ◽  
Author(s):  
Danny C. Reinke ◽  
Frank DeNoyelles Jr.
Keyword(s):  
Cadmium Concentration ◽  
Continuous Cultures ◽  
Experimental Lakes Area ◽  
Batch Cultures ◽  
Freshwater Phytoplankton ◽  
Specific Effects ◽  
Cell Counts ◽  
Phytoplankton Communities ◽  
Species Specific

The species-specific responses of natural phytoplankton communities to low cadmium concentrations were measured in Lake 239 (Experimental Lakes Area, northwestern Ontario). Both in situ and laboratory 5-L continuous-flow cultures, and 5-L and 100-mL cultures were used. Asterionella formosa, Dinobryon sertularia, and Dinobryon bavaricum showed dramatic negative sensitivity to low cadmium concentrations (5–100 μg/L), while Rhabdoderma gorskii and Elakatothrix sp. consistently increased in numbers at the same cadmium concentrations. In all experiments, some species exhibited no apparent effect to cadmium addition as measured by cell counts. The "bottle effect" of each technique was evaluated by comparing the community similarity valves of the control cultures to the lake samples and showed the in situ continuous cultures to be most similar to the lake followed by the laboratory continuous cultures, the in situ 5-L batch cultures, the 5-L laboratory cultures, and the 100-mL batch cultures. Replicate cadmium cultures, all techniques, were more similar to each other than the lake samples. The similarity of the cadmium cultures to the lake sample or control cultures decreased with increased cadmium concentration and incubation time.

Photoacclimation of natural phytoplankton communities

2016 ◽  
Vol 542 ◽  
pp. 51-62 ◽  
Author(s):  
JR Graff ◽  
TK Westberry ◽  
AJ Milligan ◽  
MB Brown ◽  
G Dall’Olmo ◽  
...  
Keyword(s):  
Phytoplankton Communities ◽  
Natural Phytoplankton

0638 Effects of cow and bag type on the undigested neutral detergent fiber after two hundred forty hours in situ incubation

2016 ◽  
Vol 94 (suppl_5) ◽  
pp. 304-305
Author(s):  
H. Yang ◽  
Y. Yan ◽  
D. J. Undersander ◽  
D. K. Combs
Keyword(s):  
Neutral Detergent Fiber ◽  
In Situ Incubation

scholarly journals Lake water dissolved inorganic carbon dynamics revealed from monthly measurements of radiocarbon in the Fuji Five Lakes, Japan

Elem Sci Anth ◽  
2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Kosuke Ota ◽  
Yusuke Yokoyama ◽  
Yosuke Miyairi ◽  
Shinya Yamamoto ◽  
Toshihiro Miyajima
Keyword(s):  
Lake Water ◽  
Inorganic Carbon ◽  
Environmental Changes ◽  
Dissolved Inorganic Carbon ◽  
Anthropogenic Activities ◽  
Aquatic Organisms ◽  
Human Society ◽  
History Of ◽  
Lake Waters ◽  
Reservoir Age

Lakes are sensitive recorders of anthropogenic activities, as human society often develops in their vicinity. Lake sediments thus have been widely used to reconstruct the history of environmental changes in the past, anthropogenic, or otherwise, and radiocarbon dating provides chronological control of the samples. However, specific values of radiocarbon in different carbon reservoirs due to the different pathways of radiocarbon from the upper atmosphere to the lake, called the radiocarbon reservoir age, is always difficult to evaluate because of dynamic processes in and around lakes. There are few systematic studies on radiocarbon reservoir ages for lakes owing to the complex radiocarbon transfer processes for lakes. Here, we investigate lake waters of the Fuji Five Lakes with monthly monitoring of the radiocarbon reservoir effects. Radiocarbon from dissolved inorganic carbon (DIC) for groundwater and river water is also measured, with resulting concentrations (Δ14C) at their lowest at Lake Kawaguchi in August 2018 (–122.4 ± 3.2‰), and at their highest at Lake Motosu in January 2019 (–22.4 ± 2.5‰), despite a distance of 25 km. However, winter values in both lakes show similar trends of rising Δ14C (about 20‰). Our lake water DIC Δ14C results are compared to previously published records obtained from sediments in Lake Motosu and Lake Kawaguchi. These suggest that total organic carbon and compound-specific radiocarbon found in sediments are heavily influenced by summer blooms of aquatic organisms that fix DIC in water. Thus, future studies to conduct similar analyses at the various lakes would be able to provide further insights into the carbon cycle around inland water, namely understanding the nature of radiocarbon reservoir ages.

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