Author: U.S. Fish and Wildlife ServicePublisher:
ISBN:
Category : Benthos
Languages : en
Pages : 2
Book Description
Late Winter Benthic Macroinvertebrates in the Upper Mississippi River
Author: U.S. Fish and Wildlife ServicePublisher:
ISBN:
Category : Benthos
Languages : en
Pages : 2
Book Description
Evaluation of Wintering Benthic Macroinvertebrates of Pool 13 of the Upper Mississippi River
Author: Wayne A. HubertSampling the Dominant Benthic Macroinvertebrates of Mississippi River Backwater Lakes
Author: James W. EckbladPublisher:
ISBN:
Category : Benthos
Languages : en
Pages : 24
Book Description
Community Structure of Benthic Macroinvertebrates in Navigation Pool No. 8, Upper Mississippi River
Author: Sandra K. BrewerPublisher:
ISBN:
Category : Benthos
Languages : en
Pages : 168
Book Description
Standing Crops of Benthic Macroinvertebrates in Selected Backwater Areas of Navigation
Author: James Norcross DaviesPublisher:
ISBN:
Category : Freshwater biology
Languages : en
Pages : 64
Book Description
Bottom samples were taken bimonthly between May 11 and October 6, 1973, in selected backwater areas of the Mississippi River. The study was initiated to determine standing crops of the benthic organisms of those areas and to provide baseline data for possible future studies related to habitat alteration.
Benthic Macroinvertebrates of Selected Aquatic Habitats of the Lower Mississippi River
Author: David C. BeckettPublisher:
ISBN:
Category : Aquatic animals
Languages : en
Pages : 82
Book Description
Benthic Macroinvertebrate Community Structure in a Backwater Lake of Pool 2, Upper Mississippi River
Author: The Proceedings of the Iowa Academy of Science
Author: Iowa Academy of SciencePublisher:
ISBN:
Category : Science
Languages : en
Pages : 544
Book Description
List of members in each volume.
Macrobenthic Survey of Navigation Pool No. 8 of the Upper Mississippi River, with Special Reference to Ecological Relationships
Author: Catherine Ann ElstadPublisher:
ISBN:
Category : Benthos
Languages : en
Pages : 462
Book Description
The macrobenthic fauna of Navigation Pool No. 8 of the Upper Mississippi River was inventoried and correlated with the average physical-chemical conditions encountered in the pool. Forty-one sampling areas, numbered in order of increasing current velocity, were delineated on the basis of characteristic chemical and physical properties during the summer of 1975. A trend toward decreasing eutrophy occurred from area 1 to area 41. Benthos samples were collected twice during the summer in each of the study areas. One hundred forty-four taxa were found in the 616 Ponar-dredge collections. Over half of the collected taxa were insect nymphs and larvae. A total of 90,693 representatives of the Phyla Platyhelminthes, Nematoda, Annelida, Arthropoda, and Mollusca were counted, weighed, and identified. Oligochaetes were by far the most ubiquitous and dominant macroinvertebrates. Greatest oligochaete densities were respectively recorded during Sampling Periods I and II in areas 3 (17,306.10/m2) and 18 (16,609.98/m2) and in areas 1 (10,302.11/m2) and 18 (10,894.18/m2). The qualitative and the quantitative compositions of the benthic communities varied among the 41 study areas. Habitat preferences of particular benthic forms were reflected in the distributional relationships between the macroinvertebrates and the physical-chemical conditions. Benthic production, in terms of the total wet weight/m2 and the mean number of macroinvertebrates/m2 in each area, was generally greater in the more eutrophic areas. The more eutrophic areas supported fewer taxa. These taxa generally consisted of pollution-tolerant organisms, such as oligochaetes and certain chironomids, which were capable of burrowing into the depositional-type substrates. More taxa and greater numbers of gill breathers and filter feeders, such as caddisflies, mayflies, stoneflies, and dipterans, were collected from the less eutrophic areas.
Population Dynamics of the Macroinvertebrates in the Mississippi River Near Monticello, Minnesota
Author: David R. McConvillePublisher:
ISBN:
Category : Freshwater invertebrate populations
Languages : en
Pages : 408
Book Description
The general objectives of this study have been to provide basic knowledge about the biology of a large river by determining the quality and quantity of the macroinvertebrates benthic populations of the Mississippi River in the Monticello, Wright County, Minnesota, region; and secondly to provide pre-operational data on the macroinvertebrates in the river before the Monticello Nuclear Power Plant begins operation. Specifically, a five-mile stretch of the river was studied with the goal of evaluating transverse and longitudinal distributions of the macroinvertebrates, their life histories, and the seasonal dynamics of the dominant genera. Various physical and chemical factors which influence the macroinvertebrate populations were also measured. Finally, since very few investigations have dealt with conditions existing in streams and rivers during the winter season, special attention was given to determination of the ecological changes occurring during that time of year, despite extremely difficult operational conditions.