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Using Phenotypic Integration To Explain Inter-Population Variation In Growth Of Chinook Salmon (Oncorhynchus Tshawytscha), Mitchel Dender
Using Phenotypic Integration To Explain Inter-Population Variation In Growth Of Chinook Salmon (Oncorhynchus Tshawytscha), Mitchel Dender
Electronic Theses and Dissertations
Across evolutionary time, correlational selection can cause the co-dependencies of multiple functionally related traits, leading to tightly correlated suites of traits known as integrated phenotypes. While it is conceptually appreciated that integrated phenotypes should benefit fitness through increased functional performance, few studies have shown evidence for this empirically. Further, within applied fields such as aquaculture, single-trait predictors of performance and fitness have been predominantly targeted without accounting for multi-trait contributions to desired phenotypes, potentially failing to maximize growth across generations in captivity. Throughout this thesis, I holistically examine the causes and consequences for the co-variation between functionally related physiological (cortisol) …
Interactive Effects Of Pre- And Post-Natal Stressors On Chinook Salmon Performance And Fitness, Pauline Marian Capelle
Interactive Effects Of Pre- And Post-Natal Stressors On Chinook Salmon Performance And Fitness, Pauline Marian Capelle
Electronic Theses and Dissertations
Assessing the intergenerational effects of stress is an important factor in determining how populations will respond to changing environments. Stressful maternal environments often lead to perceived negative effects on offspring phenotype (e.g., small size, slow growth, high fearfulness/anxiety), yet these changes may better equip offspring for stressful conditions (i.e., environmental matching), showing that intergenerational effects have the potential to dampen negative effects of environmental stressors. This thesis aims to test this theory by manipulating a maternal signal of stress and measuring offspring phenotype and performance in multiple environments. I treated Chinook salmon (Oncorhynchus tshawytscha) eggs with cortisol (low dose (LD), …