Properties of age structure models for harvested populations with applications to yellowfin tuna Thunnus albacares (Bonaterre) and harp seals Pagophilus groenlandicus (Erxleben) ...
Dynamic population models that incorporate the age structure of the population can be used as a powerful tool for fisheries management. In this thesis some of the properties and potential uses of a class of these models is examined. This class can be described as a life table operating on a populati...
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| Format: | Text |
| Language: | English |
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University of British Columbia
2011
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| Online Access: | https://dx.doi.org/10.14288/1.0101170 https://doi.library.ubc.ca/10.14288/1.0101170 |
| Summary: | Dynamic population models that incorporate the age structure of the population can be used as a powerful tool for fisheries management. In this thesis some of the properties and potential uses of a class of these models is examined. This class can be described as a life table operating on a population with a stock-recruit relation that is formed by multiplying the egg production by a function of a linear combination of the numbers of fish of different ages. The study of the properties included an analysis of the stability and the non-equilibrium behaviour of the model. This behaviour was related to some types of fluctuations observed in fish populations, special attention was given to the limit cycles that occur in populations with an unstable equilibrium and this is considered as a possible a mechanism causing the regular fluctuations known as cyclic dominance in sockeye salmon Oncorhyncus nerka (Walbaum). The fisheries for yellowfin tuna in the eastern Pacific Ocean, and harp seals in the western North ... |
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