Genetic insights into the population composition of two regional inshore mixed stocks of Atlantic cod ( Gadus morhua ) in West Greenland
The recognition of biocomplexity in a species might be essential in order to achieve a more sustainable exploitation of fishery resources, especially in the light of anthropogenic pressures such as fishery exploitations and climate change. Nevertheless, the notion of a species comprising many geneti...
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| Format: | Book |
| Language: | English |
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DTU Aqua
2015
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| Online Access: | https://orbit.dtu.dk/en/publications/b8d7d031-32e4-474a-93e9-8342ba22a99b https://backend.orbit.dtu.dk/ws/files/218318618/Master_thesis.pdf |
| Summary: | The recognition of biocomplexity in a species might be essential in order to achieve a more sustainable exploitation of fishery resources, especially in the light of anthropogenic pressures such as fishery exploitations and climate change. Nevertheless, the notion of a species comprising many genetically distinct locally populations are frequently neglected in fisheries management. Therefore, management strategies that are more focused on biological unit rather than area are essential for effective fisheries management and conservation. A better understanding off the genetic diversity of fished stocks is of paramount importance for creating the settings for management improvements and reliable predictions that help preserve future biodiversity and fisheries yields. The present thesis uses a catalogue of spatial population genetic approaches to explore the availability and methodology used for disentangling the genetic composition of mixed-stock samples. Primarily, the focus is to examine the spatial dynamics of Atlantic cod populations ( Gadus morhua ) in West Greenland. Provided contemporary samples collected by both "experts" (i.e. marine biologists) and "nonexperts" (i.e. fishermen), the spatial composition in inshore regions around Nuuk and Sisimiut was investigated. The application of a panel of 96 gene-associated Single Nucleotide Polymorphisms (SNPs) was used to assign individual fish and estimate proportional contributions to previously identified populations. Presented with different approaches for population genetics, tests of individual assignment and mixed-stock analysis showed that the suitability and application is case-specific. In particular, the evaluation of different approaches seems to be essential in the decision and selection of the most appropriate and accurate genetic tool. Here, the evaluation-process is presented and subsequently the most suitable approaches are chosen for estimating the origins at the level of individuals and populations. The individual assignment tests and mixed-stock ... |
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