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Recurrence of Hexagenia Mayflies Demonstrates Improved Water Quality in Pool 2 and Lake Pepin, Upper Mississippi River

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Recurrence of Hexagenia Mayflies Demonstrates Improved Water Quality in Pool 2 and Lake Pepin, Upper Mississippi River Winona State University OpenRiver Cal Fremling Papers Cal Fremling Archive 1990 Recurrence of hexagenia mayflies demonstrates improved water quality in Pool 2 and Lake Pepin, Upper Mississippi River Cal R. Fremling Winona State University Follow this and additional works at: https://openriver.winona.edu/calfremlingpapers Recommended Citation Fremling, Cal R., "Recurrence of hexagenia mayflies demonstrates improved water quality in Pool 2 and Lake Pepin, Upper Mississippi River" (1990). Cal Fremling Papers. 35. https://openriver.winona.edu/calfremlingpapers/35 This Book is brought to you for free and open access by the Cal Fremling Archive at OpenRiver. It has been accepted for inclusion in Cal Fremling Papers by an authorized administrator of OpenRiver. For more information, please contact [email protected]. i\ ooj>. at RECURRENCE OF HEXAGENIA MAYFLIES DEMONSTRATES IMPROVED WATER QUALITY IN POOL 2 AND LAKE PEPIN, UPPER MISSISSIPPI RIVER Calvin R. Fremling1 and D. Kent Johnson2 1 Biology Department, Winona State University, Winona, Minnesota, 55987, USA 2Metropolitan Waste Control Commission, St. Paul, Minnesota, 55101, USA ABSTRACT Hexagenia mayflies are good indicators of general water quality because they have long life cycles and because their burrowing nymphs, which are unable to tolerate anaerobic conditions or swim long distances, live in sediments where toxins tend to accumulate. While chemical tests only describe water quality in terms of specific parameters and times, Hexagenia distribution indicates synergistic effects of many toxins, anoxia and other stresses throughout the year. Over 1,400 collections of imagoes and subimagoes along the Upper Mississippi River in 1957-1968,1976 showed that most of the 29 navigation pools supported large populations, as did impoundments upstream of Minneapolis-St.Paul. Populations were non-existant or meager in Pool 2 and Lake Pepin, however, due to METRO pollution. Collections made in 1986 showed that recent pollution abatement measures have enabled Hexagenia to attain nuisance levels in the two areas, thus establishing that mayfly distribution can be utilized to assess the well-being of a river which is so large that it is difficult to monitor effectively or economically by standard methods. INTRODUCTION DESCRIPTION OF STUDY AREA Sixteen years ago, at the First International Con­ The Mississippi is the largest river in North Ame­ ference on Ephemeroptera, Fremling (1973) dis­ rica, flowing 3,731 km from its source at Lake cussed the effects of water pollution on the distri­ Itasca, Minnesota to its mouth in the Gulf of bution of Hexagenia mayflies in the United States Mexico (Fig. 1). The present study area extends and reported that on the Upper Mississippi River 145 km downstream through the METRO corri­ (UMR) Hexagenia had been virtually eliminated dor from St. Anthony Falls Lock and Dam from most of the 45 km reach downstream from through Lake Pepin. Locations within the study metropolitan Minneapolis-St. Paul (METRO) area are given as river km above the confluence of and from much of Lake Pepin (Fig. 1). This report the Mississippi and Ohio Rivers (RKM UMR). documents recurrence of Hexagenia in the affect­ The METRO area has a population of 1.85 M ed areas and discusses the environmental im­ and its domestic and industrial sewage is treated provements which made it possible. As in 1970, it by 12 treatment plants. The Metropolitan Waste­ will be demonstrated that mayfly distribution can water Treatment Plant (MWTP), operated by the be utilized to assess the well-being of a river which Metropolitan Waste Control Commission is so large that it is difficult to monitor effectively (MWCC), is the largest, treating about 81% of and economically by standard chemical and phy­ METRO sewage (833 M l.d~ !). The river within sical methods. the study area is impounded by four lock and dam I. C. Campbell (ed.) Mayflies and Stoneflies, 243-248. © 1990 Kluwer Academic Publishers. Stillwater MINNESOTA WISCONSIN Maiden Rock Metro WTP Lock & Newport Dam ? LAKE PEPIN, No. t St. Anlftorty Fate South Lock & Dam St. Paul Hastings Minneapolis MINNESOTA indicates kilometers | indicates Lock & Dam Fig. 1. Map of the study area. systems. Lake Pepin is a natural impoundment 1976), but require as long as 2 years in northern created by the damming action of the delta of the lakes (Hunt 1953) and streams (Leonard and Chippewa River. The ecological history of the Leonard 1962). The life cycle is completed in one UMR has been summarized by Fremling and Cla- year or less within the study area. In prime habi­ flin (1984). tats, last instar nymphs may often be found in concentrations of more than 340 m-2. Carlander et al. (1967) estimated the June, 1963 Hexagenia HEXAGENIA BIOLOGY population of navigation UMR Pool 19 at about 11.9 x 109. Two species, H. bilineata and H. lim- The life histories of Hexagenia mayflies are well bata, dominate the UMR; they tend to emerge en known (Needham et al. 1935, Hunt 1953, Freml­ masse at intervals of 6-11 days, causing nuisance ing 1960, Swanson 1967). The genus is probably problems from mid-June until mid-August confined to the Western Hemisphere, being found (Fremling 1968). Hexagenia nymphs are impor­ from the Rio Negro of Argentina to Great Slave tant members of the aquatic ecosystem, tilling the Lake in the Northwest Territories of Canada (Ed­ bottom and converting organic detritus and its munds et al. 1976). Burrowing nymphs dig U- contained organisms into high-quality fish food, shaped respiratory tubes in silted bottoms of thus completing a food chain that is short and lakes, streams, irrigation canals, and ponds, efficient. A long life cycle ensures their availability where their distribution is dictated primarily by to fish at all seasons. Because nymphs pass sediment type and dissolved oxygen concen­ through many moults, they are food for a wide tration at the mud-water interface. Nymphs con­ variety of fish of various sizes. sume organic detritus, algae, bacteria, pro­ Hexagenia distribution has been drastically al­ tozoans, other small organisms, and large tered by man in recent years; his pollutants elimi­ amounts of indigestible inorganic matter. They nated the insect from portions of Lake Michigan's apparently selectively ingest organic matter of Green Bay (Lee 1962), most of Lake Erie (Britt high caloric content (Zimmerman et al. 1975). 1955, Beeton 1961, Carr and Hiltunen 1965), and Rate of growth is a function of temperature; life segments of the Illinois and Mississippi Rivers cycles are completed in as little as 12 weeks under (Mills et al. 1966, Fremling 1964, 1970). laboratory conditions (Fremling 1967) and 17 Hexagenia mayflies are good indicators of wat­ weeks in Utah irrigation canals (Edmunds et al. er quality because of their long lives and intimate association with sediments where toxins accumu­ CHANGES IN WATER QUALITY late. They are especially vulnerable to anoxia Scarpino (1985) has reviewed the 1890-1950 wat­ which may kill them directly or cause them to er quality history of the UMR in the METRO abandon their burrows (Fremling 1970). While corridor, where early pollution control was dictat­ chemical tests only describe water quality in terms ed largely by development of the river for navi­ of specific parameters and times, Hexagenia dis­ gation. Channelization practices begun in 1878 tribution measures the synergistic effects of many included dredging and construction of groynes toxins, anoxia and other stressors throughout the which constricted the river, increasing its velocity year. and ability to transport sewage away from ME­ Imagoes have been used to monitor levels of TRO. In 1917, the US Army Corps of Engineers polychlorinated biphenyls (PCBs) along the (USACE) completed the Twin Cities Lock and UMR (Mauck and Olson 1977, Clements and Dam (now Lock and Dam No. 1), creating an Kawatski 1984). Nymphs are now widely used in 8 km pool which received most of METRO'S un­ America as bioassay animals in toxicity North treated sewage. In 1930, the USACE finished tests. Laboratory culture methods have been de­ Lock and Dam No. 2 at Hastings; its 60 km pool veloped (Fremling 1967), as well as artificial sub­ extended upstream to the foot of the Twin Cities strates, testing apparatus and protocol (Fremling Lock and Dam and became the resting place for and Schoening 1973, Fremling 1975, Fremling the remainder of METRO sewage, including and Mauck 1980, Henry et al. 1986). wastes from packing houses and stock yards. An investigator for the Bureau of Fisheries concluded METHODS that during the month of August the river for 72 km below St. Paul lacked sufficient oxygen to In 1958, ship captains, lock masters, harbor oper­ sustain fish life of any type. Because of intolerable ators, and interested river residents were solicited health and aesthetic problems created by the to collect mayflies along the Mississippi and its pooled sewage, the MWTP and many other treat­ tributaries (Fremling 1973). The system, used an­ ment facilities were constructed in the METRO nually through 1969, was re-employed in 1976 and area. In the succeeding years, most small treat­ 1986. Shipping strikes, floods, recruitment of new ment plants were consolidated with MWTP, was­ cooperators and other variables made it impossi­ tewater treatment efficiency was increased, ble to keep collecting effort constant from year to MWTP effluent quality was markedly improved year and throughout the river corridor. Distri­ (Fig. 2), by-passes due to combined sewer over- bution records could have been confounded by downstream drift of nymphs, upstream flight of ANNUAL AVERAGES female imagoes prior to oviposition, and transport Primary Treatment Secondary Treatment by towboats. Subimagoes of both sexes and ima­ go males are the most reliable indicators, since O) they only fly short distances from their emergence E c site. Certainly, the presence of adult mayflies in an o area indicates the best possible scenario, while 0c 80 their dearth demonstrates lack of suitable envi­ O 60 O ronment.
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