Apportionment of genetic variance in migrating and wintering mallards

1995 ◽  
Vol 73 (6) ◽  
pp. 1182-1185 ◽  
Author(s):  
Olin E. Rhodes Jr. ◽  
Ronald K. Chesser ◽  
Loren M. Smith
Keyword(s):  
Genetic Variation ◽  
Genetic Information ◽  
Genetic Variance ◽  
Anas Platyrhynchos ◽  
Genetic Data ◽  
High Plains ◽  
Southern High Plains ◽  
Total Genetic Variation ◽  
Breeding Populations ◽  
Wintering Areas

Mallards (Anas platyrhynchos, n = 289) wintering in the Southern High Plains of Texas were collected from 15 October 1988 to 7 February 1989 and electrophoretically surveyed for genetic variation at 30 biochemical loci. Genetic data were used to detect mixtures of breeding populations in the wintering aggregation of mallards that migrate into the Southern High Plains and to estimate the proportion of total genetic variation partitioned among breeding populations represented on the study area there. Wintering mallards represented mixtures of genetically heterogeneous breeding populations with a minimum of 10.4 – 11.7% of the genetic variation partitioned among populations represented. Genetic information may be useful in detecting mixtures of breeding populations in specific wintering areas within and among flyways.

Temporal components of genetic variation in migrating and wintering American wigeon

1993 ◽  
Vol 71 (11) ◽  
pp. 2229-2235 ◽  
Author(s):  
Olin E. Rhodes Jr. ◽  
Loren M. Smith ◽  
Ronald K. Chesser
Keyword(s):  
Genetic Variation ◽  
Gene Diversity ◽  
High Plains ◽  
Genetic Characteristics ◽  
Total Genetic Variation ◽  
Breeding Populations ◽  
Wintering Waterfowl ◽  
Breeding Grounds ◽  
Average Proportion ◽  
Wintering Population

Data from allele frequencies of wintering American wigeon (Anas americana) from the Southern High Plains (SHP) of Texas were used to monitor changes in genetic characteristics of the wintering population through time, and to estimate the average proportion of total genetic variation partitioned among parent breeding populations. Wigeon were surveyed electrophoretically for genetic variation at 25 biochemical loci. Changes in total gene diversity were observed throughout the study period (5 October 1988 to 15 March 1989) at numerous loci. Significant temporal changes in the genetic composition of the wintering population were detected, and a minimum of 7% of the total genetic variation in these wigeon was thought to be partitioned among the breeding populations represented on the SHP. A new influx of migrating wigeon, weather-related movements of wigeon, or spatial subdivision of breeding populations on the SHP may be responsible for shifts observed in the genetic characteristics of the wintering population. Significant heterozygote deficiencies in the sample of wintering wigeon suggest that this species maintains some degree of genetic structure on the breeding grounds. Genetic data collected from wintering waterfowl may provide minimum expectations of the degree of genetic subdivision among breeding populations and may help waterfowl biologists to detect changes in the composition of wintering waterfowl populations through time.

scholarly journals Characterization of Deleterious Mutations in Outcrossing Populations

Genetics ◽  
1998 ◽  
Vol 150 (2) ◽  
pp. 945-956 ◽  
Author(s):  
Hong-Wen Deng
Keyword(s):  
Genetic Variation ◽  
Genetic Variance ◽  
Estimation Bias ◽  
Deleterious Mutations ◽  
Environmental Variance ◽  
Higher Power ◽  
Sib Mating ◽  
The Mean ◽  
Simulation Results

Abstract Deng and Lynch recently proposed estimating the rate and effects of deleterious genomic mutations from changes in the mean and genetic variance of fitness upon selfing/outcrossing in outcrossing/highly selfing populations. The utility of our original estimation approach is limited in outcrossing populations, since selfing may not always be feasible. Here we extend the approach to any form of inbreeding in outcrossing populations. By simulations, the statistical properties of the estimation under a common form of inbreeding (sib mating) are investigated under a range of biologically plausible situations. The efficiencies of different degrees of inbreeding and two different experimental designs of estimation are also investigated. We found that estimation using the total genetic variation in the inbred generation is generally more efficient than employing the genetic variation among the mean of inbred families, and that higher degree of inbreeding employed in experiments yields higher power for estimation. The simulation results of the magnitude and direction of estimation bias under variable or epistatic mutation effects may provide a basis for accurate inferences of deleterious mutations. Simulations accounting for environmental variance of fitness suggest that, under full-sib mating, our extension can achieve reasonably well an estimation with sample sizes of only ∼2000-3000.

Soil and soil organic carbon effects on simulated Southern High Plains dryland Cotton production

2021 ◽  
Vol 212 ◽  
pp. 105040
Author(s):  
Steven A. Mauget ◽  
Sushil K. Himanshu ◽  
Tim S. Goebel ◽  
Srinivasalu Ale ◽  
Robert J. Lascano ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
High Plains ◽  
Cotton Production ◽  
Southern High Plains

scholarly journals Cotton cultivar response to potassium fertilizer application in texas’ southern high plains

2021 ◽  
Author(s):  
Nana Yaw O. Kusi ◽  
Katie L. Lewis ◽  
Gaylon D. Morgan ◽  
Glen L. Ritchie ◽  
Sanjit K. Deb ◽  
...  
Keyword(s):  
Fertilizer Application ◽  
High Plains ◽  
Potassium Fertilizer ◽  
Southern High Plains ◽  
Cotton Cultivar

Apparent Electrical Conductivity, Soil Properties and Spatial Covariance in the U.S. Southern High Plains

2005 ◽  
Vol 6 (3) ◽  
pp. 297-311 ◽  
Author(s):  
K. F. Bronson ◽  
J. D. Booker ◽  
S. J. Officer ◽  
R. J. Lascano ◽  
S. J. Maas ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Soil Properties ◽  
High Plains ◽  
Spatial Covariance ◽  
Southern High Plains ◽  
Apparent Electrical Conductivity ◽  
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