Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"age ratio"”.
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Deer behavior as it effects sex and age ratio counts
… time of day, nor weather variables affected the ratios of deer observed, the only option left available to the counter was to conduct counts during the months when counts were most representative of the sex ratio and various age classes. The best month for making a sex-ratio count was November. …
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Decision-making and demography of greater white-fronted geese
… at least eight populations with distinct migration strategies. There are three populations in North America: the Pacific Flyway, midcontinent, and Tule white-fronted geese. The Pacific Flyway and midcontinent populations have both exhibited increases in recent decades. In contrast, the …
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Determination of factors that influence digit preference: A Case study of South African Census 2011 Age-Sex date
The age distribution of a population is one of the most important demographic factors that plays a major role in describing and making projections about the population. Age distribution determine life expectancy, fertility and migration. It suffers most of the difficulties with regard to its …
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Effects of Diethylstilbestrol on Reproduction in the Black-Tailed Prairie Dog
… (p<0.01) from untreated animals held in cages. No significant weight differences were detected between females collected from DES-treated and untreated towns. Sixty-three females were collected from experimental prairie dog towns. Nine of 31 (29 percent) females from DES-treated towns were …
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Evaluations of Techniques for Estimating Fall Age Ratios of Canada and Snow Geese
Validity of flock counts, average group-size counts, cannot-net catches, and hunter-bag checks for estimating productivity of lesser snow geese (Anser caerulescens caerulescens) and small Canada geese (Branta cnadensis hutchinsii-parvipes complex) was studied at Sand Lake and Tewaukon National …
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Developing robust statistical scoring methods for use in child assessment tools
… do not appropriately remove the effect of age on development scores. This frustrates both disability status classification and comparison of scores across different child populations because their age dependent development profiles are usually quite different. Hence, the key objective of …
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The Many Types of Churn and Their Predictive Models
… Finally, a proactive approach to churn management consisting of various propositions that link each of the churn types to firm profitability is outlined. It is my hope that future churn research will adopt this empirical based approach. Chapter 2 specifically addresses the example of a …
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Selected aspects of population dynamics and food habits of bobwhite quail on the Salamonie Reservoir area, 1970-1975
… region is necessary in order to formulate management plans calculated to increase the population level.The whistling cock count technique was used to determine a call index from the average mean calls per stop. This technique correlated significantly with hunter success (P<0.05) but call …
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Population Characteristics of Urban White-Tailed Deer (Odocoileus Virginianus) in Southern Springfield, Missouri
… 1997 through December 1998. Throughout the duration of the study a total of fifty-three deer were captured by the use of Clover traps and a rocket net. A total population size estimate of 76 and a population density of 15 deer/ km² were determined by mark-recapture methods. An approximate age …
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Ecology, conservation and management of the black lechwe (Kobus leche smithemani) in the Bangweulu Basin, Zambia
… its current population status, the sex and age ratios, carrying capacity of the flood-plain where it occurs and its maximum sustainable yield. The study also estimated its potential sustainable off-take and looked into the links that exists between wildlife and socio-economics in order to …
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Angular Momentum Evolution of Young Stars
… momentum evolution during this evolutionary stage. For that purpose I have carried out an extensive photometric monitoring program which enabled me to identify a total of 405 periodic and 184 irregular variable PMS stars in the young open cluster NGC 2264 (age: 2-4 Myr). Hence, I could increase …
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MONITORING SURVIVAL OF YOUNG IN UNGULATES: A CASE STUDY WITH ROCKY MOUNTAIN ELK
… an essential component in many research and management programs. The primary techniques used to monitor survival of young in ungulate populations are age ratios, obtained from herd composition surveys, and telemetry studies of marked individuals. Concerns about survival of young and the impact …
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MONITORING SURVIVAL OF YOUNG IN UNGULATES: A CASE STUDY WITH ROCKY MOUNTAIN ELK
… an essential component in many research and management programs. The primary techniques used to monitor survival of young in ungulate populations are age ratios, obtained from herd composition surveys, and telemetry studies of marked individuals. Concerns about survival of young and the impact …
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Genetic variability in Douglas-fir based on molecular genetic markers and morphological traits
… half-sib (C) families had higher survival percentages and faster growth rates than half-sib (P) and control families. However, lower wood densities were observed in full-sib and in half-sib (C) families. Individual tree narrow sense heritability estimates in growth traits (0.116-0.234) for …
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Quantifying population- and individual-level processes in Greenland white-fronted geese (Anser albifrons flavirostris) for holistic conservation planning
… flavirostris). I used population count, age-ratio, and capture-recapture data sets to quantify heterogeneity in abundance trends and reproductive, survival, and movement rates among Greenland white-fronted goose wintering subpopulations. I found that subpopulations in the southwestern …