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- W422016189 abstract "This project was formulated with the purpose of advancing knowledge of the invasion dynamics of rats within archipelagos in New Zealand. The concentrationon islands reflected the conservation focus of this project - islands are the lastrefuges for many native New Zealand species that cannot survive in the wild onthe mainland.This project can be divided into four areas:1. Data collection: There was no intent for innovation here, but a deeper understanding of the environments in which rats are born, breed, migrate, anddie was developed.2. Development of tools for data exploration:??? A user-friendly point-and-click graphical interface for the R programwas designed to allow any user to easily explore simple genetic characteristics of the data.??? A novel method for exploring the genetic similarity between individualswas developed and showcased with real data, proving successful in casesof both high and low genetic differentiation, and in detecting likelyindividual migrants.3. Improvement of a method for estimating migration: ??? An attempt was made to improve the Markov chain Monte Carlo procedure underlying this method.??? The migration model used by the method was significantly improved,so that it could cope with any level of migration. Previously, resultsfrom situations where migration rates were high were invalid.4. Investigated topics of ecological interest:??? Field measurements of rats were used to show that Norway rats tendto have larger masses than ship rats, southern rats are generally largerthan northern rats, but the effect on mass of living on an island asopposed to the mainland depends on the latitude. It was also shownthat relative tail length is a good species discriminator.??? Multiple paternity was confirmed for both Norway and ship rats. Thisbreeding characteristic might form part of the explanation for why ratsare such successful invaders.During the project, case studies involving rats on Big South Cape Island, GreatBarrier Island and in the Bay of Islands were used to highlight the methods developed, and provided some unexpected and fascinating results." @default.
- W422016189 created "2016-06-24" @default.
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- W422016189 date "2008-01-01" @default.
- W422016189 modified "2023-09-24" @default.
- W422016189 title "Stochastic modelling of rat invasions among islands in the New Zealand archipelago" @default.
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