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Examining The Combined Impacts Of Rapid Senescence And A Low Water Stressor On Maternal State, Egg Quality, And Fitness In Chinook Salmon, Madison A. Sturba
Examining The Combined Impacts Of Rapid Senescence And A Low Water Stressor On Maternal State, Egg Quality, And Fitness In Chinook Salmon, Madison A. Sturba
Electronic Theses and Dissertations
Assessing the impact of environmental challenges on maternal state and breeding success is important for predicting how migratory Pacific salmon populations will respond to an increasingly stressful world. The overall goal of my thesis was to examine fine-scale senescent changes in female Chinook salmon over time, whether these changes impacted ovulation and egg quality, and whether exposure to an environmental challenge (low water) during senescence subsequently provoked even stronger state-dependent responses to ultimately impact female longevity and egg survival. Following an experimental decrease in water availability, I quantified changes in physical, physiological, and reproductive maternal state, then linked these changes …
Examining The Links Between Environmental Variation, Foraging Behaviour And Foraging Success In An Arctic Seabird, Alyssa Eby
Electronic Theses and Dissertations
Arctic regions are experiencing increasing variability in inter-annual sea ice dynamics ultimately impacting marine Arctic ecosystems. Arctic-breeding seabirds, such as thick-billed murres (Uria lomvia) are thus likely to be negatively impacted by fluctuating environmental conditions through its influence on prey availability. Additional extrinsic factors (colony size and chick demand) and intrinsic factors (sex) are also likely to impact foraging behaviour and success of murres in combination with environmental conditions. First, we tested the effect of colony size on colony sensitivity to environmental change at two low Arctic colonies of varying sizes, Coats Island, Nunavut and Digges Island, Nunavut …