A graduate student in civil engineering

Source text :

Addition of 0.34 g P as Na2HPO+ and 5.04 g N as NaNO3 per square meter to a small unproductive Canadiari Shield lake over a period of 17 weeks caused a several fold increase in phytoplankton standing crop, and a change in dominant species from. Chrysophyceae to Chlorbphyta.’

Source:

Schindler, D. W., Armstrong, F. A. J., Holmgren, S. K., & Brunskill, G. J. (1971). Eutrophication of Lake 227 , Experimental Lakes Area, Northwestern Ontario, by Addition of Phosphate and Nitrate. Journal of the Fisheries Research Board of Canada, 28, 1763–1782.

Writer’s text:

Schindler’s experiments on Lake 227, a small unproductive lake, involved adding 0.34 g of P as Na2HPO4 and 5.04 g of N as NaNO3 per square meter, over 17 weeks. Over those 17 weeks, the fertilization caused a severalfold increase in the phytoplankton and shifted the dominant bacteria towards species of cyanobacteria, despite the phosphorus concentrations rarely exceeding 0.05 ug/L P-PO4. This experiment also gave evidence that phosphorus accumulates in the bottom sediments based on their mass-balance calculations (D. W. Schindler et al., 1971)⁠.

Writer’s comment:

Here I was summarizing… paraphrasing this paper to describe the experiment they had done. This statement here is a summary of the experiment and this statement here is a paraphrase of the experiment.