The ecology of Chironomidae associated with stabilization lagoons Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/vq27zs312

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  • Chironomidae occurring in stabilization lagoons were studied from 1964 to 1966 in Oregon. Observations of other insects and their impact on the lagoon environment are included. Quantitative data were obtained from two lagoons near Corvallis and qualitative observations from preliminary work on two other lagoons are reported. The objectives of this investigation were to determine (1) species composition and abundance of Chironomidae occurring in lagoons; (2) the microdistribution of dominant larval species; (3) rates of adult midge emergence from lagoons; (4) larval tolerance to some physical and chemical stress factors occurring in lagoons, and (5) future areas of research. Ecological conditions in one lagoon were complicated by changes in amount of sewage loading, and by the reversal of loading sequence from primary to secondary cell. A total of 11 species of Chironomidae, including six species new to science, were recovered from two lagoons. Significant differences in larval abundance showed the following order of dominance: Glyptotendipes barbipes (Staeger) > Chironomus riparius Townes > Anatopynia dyari (Coquillett). The order of tolerance to physiochemical stress factors was G. barbipes > A. dyari > C. riparius. The established dominance order in lagoons was thought to be because larval A. dyari required more space for growth and development than did the tube dwelling species. Statistical analysis of dredging results of one lagoon showed that total larval abundance was greater in winter, greater in the primary cell, and consistently greater in peripheral zones. Larval abundance of G. barbipes was greater in winter, greater in the primary cell, and greater in the peripheral zones. Larval abundance of A. dyari and C. riparius was greater in the summer, greater in the secondary cell, and greater in the peripheral zones. The main factors affecting these differences are considered to be: sewage influent quality and quantity, depth of water, degree of peripheral slope, and duration and degree of dissolved oxygen stratification. Thus the microdistribution and abundance of chironmid larvae in stabilization lagoons can be explained in terms of the selective effect of the environment acting upon the limits of tolerance of the larvae.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2014-03-19T16:20:59Z (GMT) No. of bitstreams: 1 SturgessBrianT1968.pdf: 2371653 bytes, checksum: 583ed3f0edeac455b21510375e89770b (MD5)
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