A Comparison of Benthic Invertebrate Community Composition in the Mississippi and Illinois Rivers, Pool 26

Abstract

Ponar, a r t i f i c i a l s u b s t r a t e , and d r i f t s a m p l e s were c o l l e c t e d t o d e f i n e b e n t h i c i n v e r t e b r a t e community c o m p o s i t i o n i n Pool 26 a t t h e s u b s t r a t e s were dominated by Potamyia flava, Hydropsyche o r r i s , and Chironomidae. I l l i n o i s R i v e r a r t i f i c i a l s u b s t r a t e s were dominated by C y r n e l l u s f r a t e r n u s , Chironomidae, and O l i g o c h a e t a . A r t i f i c i a l s u b s t r a t e s i n t h e M i s s i s s i p p i R i v e r were c o l o n i z e d by t w i c e a s many t a x a and 23 t r m e s more o r g a n i s m s t h a n t h o s e i n t h e I l l i n o i s R i v e r . S i l t a t i o n appeared t o be a major f a c t o r l i m i t i n g a r t i f~c i a l s u b s t r a t e c o l o n i z a t i o n i n t h e I l l i n o l s R i v e r . Composit i o n o f t h e d r i f t was d e p t h dependent and g r e a t e s t numbers o f o r g a n i s m s and :axa were c o l l e c t e d i n t h e two upper s t r a t a ( 0 . 3 m and 3 m). M i s s i s s i p p i R i v e r d i e 1 d r i f t samples were dominated by Hydrops y c h i d a e , Ephemeridae, Ch i r o n o m i d a e , and Chaoborus, w h i l e I l l i n o i s R i v e r d r i f t was dominated by Chaoborus. G r e a t e s t d r i f t d e n s~t i e s g e n e r a l l y o c c u r r e d a t 2200 and 0100 h.

Predictive quality of macroinvertebrate ? habitat associations in lower navigation pools of the Mississippi River

“…7a, 7b, 7~). These results, in terms of taxa present, were similar to those reported by Colbert et al (1975) and Seagle et al (1982). In the lower lacustrine area of the pool the channel border habitat again had a shallow area with floating and emergent vegetation (Fig.…”

Monitoring the health of large rivers with macroinvertebrates: Do dominant taxa help or hinder the assessment?

“…Our analyses of simulated impairments also suggest that the removal of dominant taxa improves the interpretability of a number of metrics that could be used to measure changes in the macroinvertebrate community of large rivers and makes changes observed more comparable to those more frequently quantified in efforts to monitor and manage wadable streams and rivers. The approach of removing dominant taxa need not be limited to oligochaetes and hydropsychids as in our samples but may be applicable to other taxa such as chironomid midges (Hubert et al, 1984;Reece and Richardson, 2000;Koel and Stevenson, 2002), the filter-feeding caddisfly Cyrnellus fraternus (Mason et al, 1971;Seagle et al, 1982) and the amphipod Corophium lacustre (Payne et al, 1989;Way et al, 1995). Invasive species such as zebra mussel (Dreissena polymorpha) and New Zealand mudsnail (Potamopyrgus antipodarum) can also dominate macroinvertebrate assemblages (e.g.…”

Multispatial-scale variation in benthic and snag-surface macroinvertebrate assemblages in mid-continent US great rivers

“…The highest densities of mayflies were measured at sample site 503, a SC strata. Seagle et al (1982) reported a Hexagenia density as high as 454 m -2 (N = 9; 5 replicates at each site).…”

“…Abundance of (A) mayflies (Ephemeroptera) and (B) fingernail clams (Pisidiidae) at sites 501-507 in Pool 26 of the Upper Mississippi River System (MCB = main channel borders; SC = side channels). The 1974 data (sites 501-503 and 505-507) are from Colbert et al (1975) and site 504 was sampled in 1981 by Seagle et al (1982). …”