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Showing 1 to 20 of 487 for “"population size"”.
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Population size estimation from mark-resighting surveys
We consider the problem of estimating the size of a closed population based on the results of a certain type of marking-resighting sampling design. The design is similar to the commonly used multiple capture-recapture design, yet in some cases economically more feasible and easy to use. Sampling is …
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Estimating Population Size Using the Network Scale Up Method
We develop methods for estimating hard-to-reach populations from data collected using network-based questions on standard surveys. Such data arise by asking respondents how many people they know in a specific group (e.g. people named Michael, intravenous drug users). The Network Scale up Method …
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Confidence Intervals for Population Size in a Capture-Recapture Problem.
… new Wilson methods for interval estimation of population size are derived. Classical Chapman interval, Wilson and Wilson-cc intervals are examined and compared in terms of their expected interval width and exact coverage properties in two models. The new approach performs better than the …
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Evaluation of estimators of population size based on simulation techniques
Estimating the size of an animal population has been a major problem for the biologist. Although a host of techniques and mathematical refinements of existing estimators have been developed, they fail to aid the investigator when the individuals in the population do not exhibit equal probability of …
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Consequences of plant population size for pollinator visitation and plant reproductive success
… have a prominent role in determining the size of plant populations, and can affect plant-pollinator interactions. It is hypothesized that in small plant populations the ability to set seeds can be reduced due to limited pollination services, since individuals in small populations can …
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An evaluation of systematic error in the estimation of fish population size
… sampling methods were used to estimate the size of a pumpkinseed sunfish (<i>Lepomis gibbosus</i>) population in a 1.16 hectare Virginia farm pond. After estimates were obtained, the pond was drained in order to compare estimated population size with actual population size. In all cases, …
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The effects of population size on agathosma collina (rutaceae) and its conservation implications
… makes it a suitable candidate for a study of population size effects and the conservation implications for similar outbreeding species. Theory predicts that we should expect demographic problems to arise, for ecological or genetic reasons, when population size becomes too small. Initially, …
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Bioacoustic Studies of Population Size and Microdialects in an Island-Living Savannah Sparrow Population
… of passive acoustic monitoring in estimating population size and annual survival in an island population of Savannah Sparrows. Six years of data reveal that passive acoustic monitoring with autonomous recorders provides accurate underestimates of population size and annual survival. I found …
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Population Size of Blue-footed Boobies in Galápagos: Evaluation of Indications of Population Decline
… in Galápagos, Ecuador from 2011-2012 indicated a population reduction, probably by more than 50%. Anthropogenic effects such as introduced predators are unlikely to explain this decline, because islands with and without such factors exhibited the same low breeding. The poor reproduction seems to …
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ESTIMATING GIRAFFE (GIRAFFA CAMELOPARDALIS) POPULATION SIZE AND SURVIVAL RATES IN SOUTH LUANGWA VALLEY, ZAMBIA
<p>Giraffe populations across their range have declined significantly over the past 40 years. Recent studies of these declines noted that conservation efforts often lack basic population estimates and descriptions of demographic parameters such as sex- and age-specific survival rates. I addressed …
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Population Size and Movements of Spotted Salamanders at South Holston Dam, Sullivan County, Tennessee.
… In this study, I establish baseline data of a population of Spotted Salamanders so future monitoring of this population can be performed. The study site is located in northeastern Tennessee, just east of the city of Bristol. It is a vernal pond at the Osceola Island Recreation Area one mile …
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Effects of Management and Population Size on Genetic Diversity of Eggert's Sunflower (HELIANTHUS EGGERTII; ASTERACEAE)
… of genetic diversity present within and among populations. Maintaining genetic diversity is one of the primary objectives in managing threatened species or populations. Fire and population size may influence genetic diversity. Two Inter-Simple Sequence Repeat Markers (873 and MAO) were used to …
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The role of density and population size in the pandemic-crisis experience of Covid-19
L'abstract è presente nell'allegato / the abstract is in the attachment
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Effects of Population Size, Selection Intensity and Linkage on Response to Selection for Oil in Maize
Made available in DSpace on 2014-12-10T17:47:18Z (GMT). No. of bitstreams: 1 6711921.pdf: 2172235 bytes, checksum: 117853d1238320ede59a56cba498c231 (MD5) Previous issue date: 1967
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The effect of degree of debeaking and cage population size on selected production characteristics of caged layers
Thesis (M.S.)--Michigan State University of Agriculture and Applied Science. Dept. of Poultry Science, 1965
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Demographic and Genetic Consequences of Small Population Size in Remnant Populations of Arabis georgiana Harper (Georgia Rockcress)
… demographic and genetic consequences of small population size in remnant populations of Arabis georgiana Harper (Georgia Rockcress). Specifically, 1 ) traits associated with phenological progression, fitness and reproductive success were compared between naturally occurring "native" plants and …
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The Remedial Reading Program of Des Moines Compared with Programs of Cities that are Similar in Population Size
[iv], 54, [1] leaves. Advisor: Carl C. Fehrle
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