Effect of deposits in Columbia Slough on algae growth in Smith and Bybee lakes Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/qb98mj677

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  • Currently, the Port of Portland is developing a 9, 410 acre area at the confluence of the Columbia and Willamette Rivers in Multnomah County, Oregon. This area will be developed for industrial, commercial, and recreational use. The recreational development in the North Portland Peninsula area, including the Rivergate Industrial District, will be primarily water oriented. Development will take place on Smith and Bybee Lakes and Columbia Slough. The water recreation on the lakes could be harmed if an extensive algal "bloom" occurs in the lakes. This occurrence could result from nutrients, primarily phosphorus, in the bottom deposits of Columbia Slough. Samples obtained from the bottom deposits of the slough, along an area where numerous industrial and municipal outfalls exist were analyzed for orthophosphate and total soluble phosphate. Analyses show the concentration of orthophosphate was less in the interstitial water of the bottom deposits than the amount in the overlying water in all but that sample taken near the Associated Meat Packers, Inc. outfall. The total soluble phosphate was greater in the interstitial water than the amount found in the overlying water. When samples of the interstitial and overlying waters were inoculated with Selenastrum capricornutum less growth occurred in the interstitial samples than those samples containing overlying water. This lesser amount occurred only in those samples which were not obtained in the vicinity of any industrial outfalls. For the one sample obtained near the meat packing outfall, the growth of S. capricornutum was greater in the interstitial water. When S. capricornutum was inoculated in overlying water samples, with and without bottom deposits, less chlorophyll was extracted from the sample containing the bottom deposit. It appears the bottom deposits under laboratory conditions inhibit the growth of S. capricornutum. This was verified in the growth and chlorophyll comparison analyses and also the dissolved oxygen analysis. The lowering of the pH below the optimum growth level and the low dissolved oxygen may inhibit algal growth.
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