| dc.contributor.author | Jones, Matthew William. | en_US |
| dc.date.accessioned | 2014-10-21T12:36:07Z | |
| dc.date.available | 2001 | |
| dc.date.issued | 2001 | en_US |
| dc.identifier.other | AAINQ66660 | en_US |
| dc.identifier.uri | http://hdl.handle.net/10222/55790 | |
| dc.description | I used genetic markers to address questions fundamental to the conservation of two salmonids native to Eastern Canada. These questions centre on effective population size, some factors that influence it, and the effect of low population size on genetic diversity. Genetic variability is believed to be an important determinant of a population's long-term persistence in the face of changing environments. To test the generality of previously observed low levels of heterozygosity in lake populations of brook trout (Salvelinus fontinalis ), I examined genetic variation within and among nine pairs of adjacent lake and stream populations. Lake populations generally had lower heterozygosity than their adjacent stream populations. There were negative associations between metrics of fishing mortality and the difference in heterozygosity between lake and adjacent stream populations. | en_US |
| dc.description | Mating systems can strongly influence effective population size. Examining factors that affect fertilization success of mature male Atlantic salmon ( Salmo salar) parr when competing with a single anadromous male for the opportunity to fertilize eggs of a single anadromous female, I found parr body size was an important predictor of the probability of an individual being involved in spawning. I found a negative relationship between total parr fertilization success and intensity of anadromous male competition. I also established two experimental replicates each involving multiple anadromous males and females and mature male parr in a semi-natural spawning environment. There was some evidence of size being an important determinant of both the frequency of spawning and the overall individual parr fertilization success among those parr identified as having spawned. Fertilization of eggs by parr can significantly increase the effective number of males on a nest-by-nest basis, however, the variance in individual anadromous male fertilization success appears to have the greatest overall influence on effective population size. | en_US |
| dc.description | Using temporal and spatial microsatellite variation of threatened Atlantic salmon in the Inner Bay of Fundy, I found that while a previous reintroduction programme achieved its goals of introducing genetic variation similar to that of the source population to the new population, similar results were found for a population that had been recolonized naturally. Heterogeneity among year groups within some Inner Bay rivers was found, as was a decline in genetic variation in some populations. Finally, while there is some degree of reproductive isolation between Inner Bay salmon and other salmon populations, they do not appear to compose a unique phylogenetic lineage. | en_US |
| dc.description | Thesis (Ph.D.)--Dalhousie University (Canada), 2001. | en_US |
| dc.language | eng | en_US |
| dc.publisher | Dalhousie University | en_US |
| dc.publisher | | en_US |
| dc.subject | Biology, Ecology. | en_US |
| dc.subject | Biology, Genetics. | en_US |
| dc.subject | Biology, Zoology. | en_US |
| dc.title | Application of genetic markers to conservation biology: Salmonid fish in Eastern Canada. | en_US |
| dc.type | text | en_US |
| dc.contributor.degree | Ph.D. | en_US |
