Phytoplankton fluctuations in the Des Moines River, Iowa

Abstract

Identification Code for Diatom Species No. Species No. Species No. oi Achnanthes lanceolata 35 Diatoma elongatum 69 02 Achaanthes minutissima 36 Diatoma vulgare 70 03 Achnanthes sp. 37 Diatoma sp. 71 04 Am phiprora paludosa 38 Diploneis smithii 72 05 Amphiprora sp. 39 Diploneis sp. 73 06 Amphora ovalis 40 Epithemia turgida 74 07 Amphora sp. 41 Epithemia sorex 75 08 Ancmoeoneis exilis 42 Epithemia sp. 76 09 Astcrionella formosa 43 Eunotia sp. (first) 77 10 Bac llaria paradoxa 44 Eunotia sp. (second) 78 11 BidJulphia laevis 45 Fragilaria capucina 79 12 Caloneis amphisbaena 46 Fragilaria construens 80 13 Caloneis sp. 47 Fragilaria crotoncnsis 81 14 Ceritoneis arcus 48 Fragilaria pinnata 82 15 Cocconeis pediculus 49 Fragilaria sp. 83 84 85 16 Cocconeis placentula 50 Frustulia sp. 83 84 85 17 Cocconeis sp. 5> Gomphonema olivaceum 83 84 85 18 Coscinodiscus rothii 52 Gomphonema sp. 83 84 85 19 Coscinodiscus (brackish) 53 Gyrosigma kutzingii 86 20 Co! cinodiscus sp. 54 Gyrosigma sp. 87 21 Cyinatopleura solea 55 Hantzchia amphioxys 88 22 Cyinatosira belgica 56 Melosira ambigua 89 23 Cy<lotelIa atomus 57 Mclosira distans var. alpigena 90 24 Cyclotclla comta 58 Melosira granulata 91 25 Cyclotclla kutzingiana 59 Melosira binderana 92 26 Cyclotella meneghiniana 60 Melosira islandica 93 27 Cyclotclla pseudostelligera 61 Melosira italica 94 95 96 28 Cy clotella stelligera 62 Melosira varians 94 95 96 29 Cyclotclla striata 63 Mcridion circulare 94 95 96 30 Cy clotclla sp. 64 Navicula cryptocephala 94 95 96 31 Cytnbella ventricosa 65 Navicula sp. (first) 97 32 Cymbella tumida 66 Navicula sp. (second) 98 33 Cymbclla sp.

Relationships between phytoplankton and periphyton communities in a central Iowa stream

“…Kilkus et al (1975), in a study of 14 Iowa streams, found that diatoms were the dominant forms in 95% of their samples, especially the genera Cyclotella, Navicula, and Synedra. Drum (1964) and Gudmundson (1969) found the centric diatoms Stephanodiscus and Cyclotella were the most common phytoplankters in a larger central Iowa river, the Des Moines . Drum's (1964), Gudmundsons' (1969, and Starret & Patrick's (1952) data at first seemed to contradict the hypothesis that the phytoplankton arises from the sediments because centric diatoms are normally not considered benthic forms .…”

A Model of Algal Exports in Some Iowa Streams

“…Several studies have shown that the streams of central Iowa carry high concentrations of suspended algae, particularly diatoms (Dodd 1971, Gudmundson 1969, Drum 1964, Lowe 1970, Kilkus 1972, Jones 1972. In a sampling program on 14 streams, Kilkus (1972) found average summer levels of 24,500 cells/ml and 55 mg/M3 of chlorophyll a.…”

Algal communities of the Skunk River, Iowa, with special reference to the epipelon

“…Gudmundson (1969), however, reported concentrations up to 281,074 algal units/ml from the Des Moines River during May, There were also distinct qualitative differences among these rivers. Kilkus et al (1975) stated that diatoms, especially the genera Cyclotella, Navicula and Synedra, were While the Des Moines River contained an important centric diatom flora the Skunk River usually did not.…”