Knowledge Core Collection:https://hdl.handle.net/11681/468562024-03-28T17:57:45Z2024-03-28T17:57:45ZMechanisms that regulate the intensity of oxidation-reduction in anaerobic sediments and natural water systemsBrannon, James M.Gunnison, DouglasButler, Patricia L.Smith, Isaachttps://hdl.handle.net/11681/65252024-03-22T20:36:13Z1978-08-01T00:00:00ZTitle: Mechanisms that regulate the intensity of oxidation-reduction in anaerobic sediments and natural water systems
Authors: Brannon, James M.; Gunnison, Douglas; Butler, Patricia L.; Smith, Isaac
Abstract: A literature review and a series of laboratory experiments were conducted to investigate the mechanisms that regulate the intensity of oxidation-reduction in natural environments. Results of the literature review indicated that following depletion of oxygen and nitrate, the highly reduced conditions reached by systems containing substantial amounts of organic matter appear to involve mixed potentials generated by unknown organic oxidation-reduction couples that act in concert with inorganic oxidation-reduction couples. Results of the laboratory studies confirmed that organic oxidation-reduction couples of an unknown nature were exerting a strong influence on Eh. The iron and manganese oxidation-reduction systems were also shown to be affecting Eh, although in a manner consistent with the existence of a mixed potential. Redox potential should only be used as a semiquantitative indicator of the intensity of reduction. Precise evaluation of the reduction status of anaerobic natural environments should be determined by rigorous analysis of various chemical constituents, including manganese (II), iron (II), and sulfide. Comparison of results of the present study with those of others indicated that microbial succession and appearance of reduced products closely parallel those found in flooded soils and sediments. The appearance of reduced products corresponded to the sequence roughly predicted by thermodynamics.
Description: Technical Report1978-08-01T00:00:00ZEarly life history of northern pike in artificial wetlands of Conesus Lake, New YorkMorrow, James V.Killgore, K. JackMiller, Gary L. (Gary Leon), 1954-https://hdl.handle.net/11681/65242023-04-06T21:19:41Z1995-06-01T00:00:00ZTitle: Early life history of northern pike in artificial wetlands of Conesus Lake, New York
Authors: Morrow, James V.; Killgore, K. Jack; Miller, Gary L. (Gary Leon), 1954-
Abstract: Reproductive success of northern pike was evaluated for artificial and natural wetlands adjacent to Conesus Lake, New York. Fishes were collected for 3 consecutive years during the spawning/rearing season (April- June). Larval and juvenile northern pike were collected in natural wetlands, artificial wetlands, and in Conesus Inlet. Mean abundance and mean length of pike were compared between these habitats.
Northern pike spawn in natural and artificial wetlands adjacent to Conesus Lake and Conesus Inlet. Mean abundance and mean length of larval northern pike were greater in artificial wetlands than in natural wetlands. Emigration from the wetlands into Conesus Inlet begins at sizes as small as 14 mm and is usually complete at a length of 30 mm. Northern pike were collected in Conesus Inlet as early as 6 April at sizes of 14 mm and as late
as 2 June at sizes of 80 mm, indicating that Conesus Inlet is an important transitional habitat between spawning wetlands and Conesus Lake.
Artificial spawning wetlands for northern pike should be designed and managed to promote growth of grasses and sedges and inhibit growth of woody vegetation. They should flood in early spring and dry in late summer or early fall, but water levels should not fluctuate greatly during the spawning and rearing season. Larval and juvenile northern pike should have access to deepwater habitats from hatching until the wetlands dry.
Description: Technical Report1995-06-01T00:00:00ZConstruction and monitoring of water and sediments in wetlands created in the Black Butte Reservoir fluctuation zone, Orland, CaliforniaDowner, Charles Waynehttps://hdl.handle.net/11681/65232024-03-12T19:49:43Z1995-08-01T00:00:00ZTitle: Construction and monitoring of water and sediments in wetlands created in the Black Butte Reservoir fluctuation zone, Orland, California
Authors: Downer, Charles Wayne
Abstract: Six wetland areas were constructed in the fluctuation zone of Black Butte Reservoir near Orland, CA, in November of 1991. The wetlands were to function as wildlife habitat and sediment traps. The wetlands ranged in size from less than 1 acre to approximately 3 acres for a total area of about 8 acres. The wetlands were constructed using simple low-cost techniques at an estimated cost of $40,000 for materials and labor. Careful selection of sites aided in controlling construction costs. After construction, the wetland water levels and sediment accumulation were monitored. During the first 2 years of monitoring, the wetlands were inundated for much of the time, much longer than under normal conditions. During the last year of monitoring, the wetlands were inundated for a much shorter period, closer to normal conditions. Sediment accretion in all the wetlands was high, ranging form 5.6 to 89.2 m.m/year (2.0 to 42.5 kg/m²). Sediment accretion varied between wetlands, years, and measurement techniques. Sediment accretion in the wetlands also varied with elevation, with higher sediment accretion occurring at sites with lower elevations.
Description: Technical Report1995-08-01T00:00:00ZWildlife community habitat evaluation using a modified species-area relationshipSchroeder, Richard L.https://hdl.handle.net/11681/65222023-04-06T21:19:05Z1996-07-01T00:00:00ZTitle: Wildlife community habitat evaluation using a modified species-area relationship
Authors: Schroeder, Richard L.
Abstract: The size of a habitat has a strong influence on the number, composition, and productivity of wildlife species within a given community. The species-area relationship can be a useful tool for wildlife community habitat evaluation. Species-area curves can be modified to consider both landscape and habitat elements and to provide improved predictions of either overall species richness or richness of specific groups of wildlife. Limitations of using the species-area relationship include the possibility of overlooking the value of small areas for certain species and the difficulty in considering the effects of regional dynamics on species richness.
Description: Technical Report1996-07-01T00:00:00Z