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- Winchell, N. H. (Newton Horace), 1839-1914. (5)
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Articles 1 - 30 of 114
Full-Text Articles in Life Sciences
Undergraduate Symposium Abstracts
Undergraduate Symposium Abstracts
Journal of the Minnesota Academy of Science
No abstract provided.
Symposia
Journal of the Minnesota Academy of Science
Abstracts from the Symposia Papers given at the 68th Annual Meeting for the Journal of the Minnesota Academy of Science.
Winchell Papers
Journal of the Minnesota Academy of Science
Abstracts from the Winchell Papers given at the 68th Annual Meeting for the Journal of the Minnesota Academy of Science.
Winchell Posters
Journal of the Minnesota Academy of Science
Abstracts from the Winchell Posters given at the 68th Annual Meeting for the Journal of the Minnesota Academy of Science.
Symposia
Journal of the Minnesota Academy of Science
Abstracts from the Symposia Papers given at the 67th Annual Meeting for the Journal of the Minnesota Academy of Science.
Winchell Papers
Journal of the Minnesota Academy of Science
Abstracts from the Winchell Papers given at the 67th Annual Meeting for the Journal of the Minnesota Academy of Science.
Winchell Posters
Journal of the Minnesota Academy of Science
Abstracts from the Winchell Posters given at the 67th Annual Meeting for the Journal of the Minnesota Academy of Science.
Effect Of Human Disturbance On Small Mammal Communities In Itasca State Park, Minnesota, Nancy L. Staus, Kathleen Conforti, Leslie N. Clapper, Jennifer A. Longhenry, C. C. Schoenbauer, Michael S. Rentz, John R. Tester
Effect Of Human Disturbance On Small Mammal Communities In Itasca State Park, Minnesota, Nancy L. Staus, Kathleen Conforti, Leslie N. Clapper, Jennifer A. Longhenry, C. C. Schoenbauer, Michael S. Rentz, John R. Tester
Journal of the Minnesota Academy of Science
We determined effects of different levels of human disturbance on small mammal richness and relative abundance from live-trapping data obtained in Itasca State Park in northwestern Minnesota. We developed a quantitative measure of human disturbance based on disturbance units and trapped small mammals on three study sites, each reflecting a different level of disturbance. Our data revealed that small mammal diversity decreased with increasing human disturbance. Amount of ground cover and litter depth also appeared to be important in explaining differences in the demographic patterns of small mammals among sites.
Symposia
Journal of the Minnesota Academy of Science
Abstracts from the Symposia Papers given at the 66th Annual Meeting for the Journal of the Minnesota Academy of Science.
Winchell Papers
Journal of the Minnesota Academy of Science
Abstracts from the Winchell Papers given at the 66th Annual Meeting for the Journal of the Minnesota Academy of Science.
Winchell Posters
Journal of the Minnesota Academy of Science
Abstracts from the Winchell Posters given at the 66th Annual Meeting for the Journal of the Minnesota Academy of Science.
Winchell Papers
Journal of the Minnesota Academy of Science
Abstracts from the Winchell Papers given at the Annual Meeting for the Journal of the Minnesota Academy of Science.
Winchell Posters
Journal of the Minnesota Academy of Science
Abstracts from the Winchell Posters given at the Annual Meeting for the Journal of the Minnesota Academy of Science.
Winchell Posters
Journal of the Minnesota Academy of Science
Abstracts from the Winchell Posters given at the Annual Meeting for the Journal of the Minnesota Academy of Science.
Symposia
Journal of the Minnesota Academy of Science
Abstracts from the Symposia given at the Annual Meeting for the Journal of the Minnesota Academy of Science.
Professional Papers
Journal of the Minnesota Academy of Science
Abstracts from the Professional Papers given at the Annual Meeting for the Journal of the Minnesota Academy of Science.
Winchell Papers
Journal of the Minnesota Academy of Science
Abstracts from the Winchell Papers given at the Annual Meeting for the Journal of the Minnesota Academy of Science.
Biological Processes: Relationships Between Earthworms And Soil Temperature, Edwin C. Berry, Jerry K. Radke
Biological Processes: Relationships Between Earthworms And Soil Temperature, Edwin C. Berry, Jerry K. Radke
Journal of the Minnesota Academy of Science
Soil fauna play important roles in many soil processes and conditions which relate to agricultural systems. Earthworms are credited with enhancing soil fertility and soil physical properties by their feeding and burrowing activities. Most research on earthworms has focused on the warmer seasons of the year and relatively little is known about earthworm activity and survival during the portion of the year with frozen soils. Earthworms may survive winter by acclimatization, aestivation, or by burrowing to deeper depths where the soil is not frozen. More research is needed on the fate of earthworms in frozen soils. Suggested research areas include: …
Freezing And Thawing Of Agricultural Soils: Implications For Soil, Water, And Air Quality, Brenton S. Sharratt, Keith E. Saxton, Jerry K. Radke
Freezing And Thawing Of Agricultural Soils: Implications For Soil, Water, And Air Quality, Brenton S. Sharratt, Keith E. Saxton, Jerry K. Radke
Journal of the Minnesota Academy of Science
Most agricultural lands in the USA are subject to subfreezing temperatures. Soil freezing and thawing affects both biotic and abiotic interactions and processes which vary with weather, soil type, land management, and topography. Soil fauna generally undergo physiological changes or rely on locomotion as a means of adapting to frozen soils. Managing faunal populations using soil management may be achievable with a better understanding of winter ecological processes. Many of the thermal, hydraulic, mechanical, and physical properties of soils are altered by freezing and thawing. Soil erosion may be accentuated by soil freezing and thawing as a result of changes …
Frost Tillage For Soil Management In The Northeastern Usa, Harold M. Van Es, Robert R. Schindelbeck
Frost Tillage For Soil Management In The Northeastern Usa, Harold M. Van Es, Robert R. Schindelbeck
Journal of the Minnesota Academy of Science
Tillage during the winter is typically considered impossible, despite its desirability in some cases. Soil freezing results in net upward movement of water to the freezing zone which facilitates primary tillage or incorporation of amendments. these can be performed during a time window when the frost layer is sufficiently thin to be ripped and the underlying soil is tillable. We evaluated the feasibility of frost tillage and performed an agronomic comparison with spring-tilled soil. Soil conditions conductive to frost tillage occurred during three time windows in the 1991/1992 and two in the 1992/1993 winter at Ithaca, NY. Frost tillage resulted …
Overwinter Changes In Dry Aggregate Size Distribution Influencing Wind Erodibility In A Spring Wheat-Summerfallow Cropping System, Stephen D. Merrill, Alfred L. Black, Ted M. Zobeck
Overwinter Changes In Dry Aggregate Size Distribution Influencing Wind Erodibility In A Spring Wheat-Summerfallow Cropping System, Stephen D. Merrill, Alfred L. Black, Ted M. Zobeck
Journal of the Minnesota Academy of Science
A long-term study of the wind erodibility properties of a two-year spring wheat-summerfallow cropping systems was started in 1988 in south-central North Dakota as part of an USDA-ARS led effort to construct a process-oriented soil erosion predictive model. Observations were conducted on a conservation tillage experiment established in 1984 on soil classified in the U.S. as Typic-Pachic Haploborolls and in Canada as Brown to Dark Brown Chenozemic. The experiment included four residue-management treatments defined by targeted residue coverages: no-till, > 60% cover; minimal-till, 30% to 60% cover and undercutter dominated; conventional-till, < 30% cover and disk dominated; low-residue, < 5 % cover. Fall and spring measurements of dry aggregate size distribution (ASD) of surface soil (0 to 4 cm depth), and overwinter changes in ASD are reported here. A rotary sieve produced six size fractions ranging from < 0.42 mm to > 19.2 mm diameter. Measurements of ASD are expressed as geometric …
Frozen Soils: A Perspective On Past And Future Research For Promoting Sustainable Agricultural Systems, Jerry K. Radke, Brenton S. Sharratt, W. Doral Kemper, Dale A. Bucks
Frozen Soils: A Perspective On Past And Future Research For Promoting Sustainable Agricultural Systems, Jerry K. Radke, Brenton S. Sharratt, W. Doral Kemper, Dale A. Bucks
Journal of the Minnesota Academy of Science
Frozen soils impact many industries which rely· on soil, water, and .air resources in developing and manufacturing products. Most noteworthy is the agricultural industry in the northern United States where soils, which sustain food and fiber production, are subjected to frequent freezing and thawing. Soil freezing and thawing influences soil erodibility, surface and ground water quality, air quality, and biological activity. Many strides toward understanding frozen soil processes and managing lands to minimize the adverse effects of freezing and thawing have been made over the last two decades. Yet, further efforts to identify frozen soil processes which influence wind and …
Wetlands/Groundwater Quality In Agricultural Landscapes, D. H. Rickerl, D. E. Kringen, T. A. Machacek
Wetlands/Groundwater Quality In Agricultural Landscapes, D. H. Rickerl, D. E. Kringen, T. A. Machacek
Journal of the Minnesota Academy of Science
In the Prairie Pothole Region (PPR - SO, NO, MN, IA), wetlands classified as "semi-permanent" or "seasonal" can act as groundwater recharge sites. The nutrient filtering capacity of wetlands has been investigated for both natural and constructed wetlands linked to surface water, but there is little information available on their subsequent impact on groundwater quality. This study investigates four seasonal and two semi-permanent wetlands in the PPR of eastern South Dakota. Transitional no-till (TNT) and organic farm (ORG) management systems border the wetlands. The objective is to determine the effects of farm management system on wetland surface water and groundwater …
The Response Of Invertebrates In Temporary Vernal Wetlands To Altosid Sr-10 As Used In Mosquito Abatement Programs, Ronald W. Lawrenz
The Response Of Invertebrates In Temporary Vernal Wetlands To Altosid Sr-10 As Used In Mosquito Abatement Programs, Ronald W. Lawrenz
Journal of the Minnesota Academy of Science
Three temporary vernal wetlands on the Bayport Wildlife Management Area in eastern Washington County, Minnesota, were divided by sandbag barrier into treatment and control areas. Designated areas were treated with Altosid® SR-10 briquets at standard mosquito control rates. Invertebrate populations were monitored weekly using net sweeps, column samples, and ocular estimates.
The development of Eubranchtpus bundyi, Lyncerus sp, and Daphnia sp., the three major components of the invertebrate fauna, was delayed by as much as one week in site 47. Similar developmental lags were noted for E. bundyi populations in the treated portions of sites 6 and 32. Delay of …