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POPULATION GENETICS AND RECRUITMENT OF THE KELP BASS,
PARALABRAX CLATHRATUS
by
Augustus Vogel
A Dissertation Presented to the
FACULTY OF THE GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(BIOLOGY)
December 2006
Copyright 2006 Augustus Vogel
Object Description
| Title | Population genetics and recruitment of the kelp bass, Paralabrax clathratus |
| Author | Vogel, Augustus |
| Author email | avogel@usc.edu |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Biology |
| School | College of Letters, Arts and Sciences |
| Date defended/completed | 2006-10-11 |
| Date submitted | 2006 |
| Restricted until | Unrestricted |
| Date published | 2006-11-21 |
| Advisor (committee chair) | Edmands, Suzanne |
| Advisor (committee member) |
Kiefer, Dale A. Hedgecock, Dennis Thacker, Christine Michaels, Anthony Wilson, John P. |
| Abstract | Many longstanding questions in marine science center on understanding population variability. Research efforts that address these issues include analyses of recruitment and studies of genetic variance. Understanding recruitment variability is important in that it can change stock abundance and age structure, whereas genetic differences can be reflective of differential parental contribution, genetic drift and migration. This thesis is a report on variability in the recruitment and genetic structure in the kelp bass, Paralabrax clathratus, an important sport fishery in Southern California.; In an analysis of spatial genetic variance, neither Paralabrax clathratus nor woolly sculpin, Clinocottus analis, were limited by dispersal barriers. This result was used to argue that Punta Eugenia, reported to be a potential phylogeographic boundary, only limits widely structured species and does not uniquely impede gene flow.; Analysis of temporal variance showed that Paralabrax clathratus has a small, short-term, effective population size. Combined with evidence of linkage disequilibrium, unpredictable patterns of genetic relationship both between locations and location-year classes, and reduced allelic richness in recruit samples, it was determined that kelp bass exhibit significant temporal changes with evolutionary and management consequences.; These analyses were supported by a study confirming the utility and Mendelian inheritance of the genetic markers used. Another study on the influences of sample size and population differentiation on statistical power and estimation of differentiation also assisted interpretation. This simulation analysis in more general terms described the need for large sample sizes and repetitive sampling when studying high gene flow species such as kelp bass. It further presented some of the mathematical characteristics of methods used to estimate population differentiation.; The influence of the environment on kelp bass recruitment was analyzed by describing thecorrelation between recruitment and triad zones- areas of enrichment and concentration ofnutrients and retention of larvae. Years with median levels of these processes were the mostproductive for recruitment, and presented the possibilities of recognizing strong recruitmentyears from environmental data and developing generalized explanations of recruitment alongthe California and Baja coasts. |
| Keyword | Paralabrax; genetic; recruiment; temporal; otolith; triad |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Type | texts |
| Legacy record ID | usctheses-m184 |
| Contributing entity | University of Southern California |
| Rights | Vogel, Augustus |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | cisadmin@dots.usc.edu |
| Filename | etd-Vogel-20061121 |
| Archival file | uscthesesreloadpub_Volume14/etd-Vogel-20061121.pdf |
Description
| Title | Page 1 |
| Contributing entity | University of Southern California |
| Repository email | cisadmin@dots.usc.edu |
| Full text | POPULATION GENETICS AND RECRUITMENT OF THE KELP BASS, PARALABRAX CLATHRATUS by Augustus Vogel A Dissertation Presented to the FACULTY OF THE GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (BIOLOGY) December 2006 Copyright 2006 Augustus Vogel |
