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Relationships between Stream Size, Suspended Particles, and Filter-Feeding Macroinvertebrates in a Great Plains Drainage Network

^a Dep. of Zoology, Southern Illinois University, Carbondale, IL 62901-6501
^b Division of Biology, Ackert Hall, Kansas State University, Manhattan, KS 66506

View larger version (25K): [in a new window]   Fig. 1. Map of the Kansas River drainage study region in northeastern Kansas showing sampling stations for seston and macroinvertebrates. Sampling stations are indicated by black triangles. Gray shading indicates urban areas on the Kansas River.

View larger version (22K): [in a new window]   Fig. 2. Annual average concentrations of organic and inorganic components of total seston at each of the study sites. Sites are arranged in order of increasing size (flow class), and major anthropogenic effects (impoundments and suburban development) are indicated.

View larger version (20K): [in a new window]   Fig. 3. Annual average (±1 SE) C to N ratio of (A) fine and (B) very fine organic seston particles below and above impoundments, and (C) fine and (D) very fine organic seston particles in streams draining suburban development and similar-size streams with no suburban development in catchments. * Indicates means are significantly different (p < 0.01).

View larger version (29K): [in a new window]   Fig. 4. Average seasonal C to N ratio patterns of (A) fine and (B) very fine organic particles in a large river (KR3), mid-order (MC2) and headwater stream (KC2), (C) fine and (D) very fine organic particles in two sites located below impoundments, and (E) fine and (F) very fine organic particles in two sites draining suburban development.

View larger version (18K): [in a new window]   Fig. 5. Relationships between average annual organic seston concentrations and (A) filter-feeding macroinvertebrate taxa richness, (B) Hydropsyche spp. abundance, and (C) Potamyia flava abundance. Relationships are simple linear correlations, and do not include impounded or suburban sites.

View larger version (20K): [in a new window]   Fig. 6. Comparison of filter-feeding macroinvertebrate (A) average (±1 SE) taxa richness and (B) community structure above and below reservoirs. Community structure data is for the Big Blue River sites upstream and downstream of Tuttle Creek reservoir. * Indicates means are significantly different (p < 0.01).